DE2818930A1 - INFRARED MESSAGE TRANSFER ARRANGEMENT - Google Patents

Description

Dipl.-Ing. Dipl.-Chem. Dipl.-Ing.

E. Prince - Dr. G. Hauser - G. Leiser

Ernsbergerstrasse 19

8 Munich 60

Our reference: T 3041 April 25, 1978

TEXAS INSTRUMENTS INCORPORATED
13500 North Central Expressway
Dallas, Texas, V.St.A.

Infrared communication arrangement

The invention relates to a communication system and, more particularly, to one using infrared light Communication arrangement with a portable, battery-powered transmitter.

Infrared messaging arrangements have emerged for short-range transmission of analog and digital Information proved extremely valuable. The advantages of infrared transmission are obvious; the transfer of infrared data does not generate high frequency interference, that could conflict with other devices and, more importantly, the infrared receiver is not affected by radio frequency interference generated by other existing equipment will. A known arrangement in which use is made of the infrared transmission of analog information is a music transmission arrangement in which an infrared transmitter is connected to a hi-fi device, a stereo device or Another amplifier device connected for musicians ection Schw / Ba

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while a portable receiver is built into headphones. The music is made with the help of infrared energy transmitted to any location within the room in which the transmitter is installed. The transmitter however, this known arrangement is not portable; the FM and AM envelope modulation used requires the emission of a relatively high energy of the infrared signal, so that a feed from a Battery with a usable battery life not possible.

In particular, the known arrangement cannot be used as a portable transmitter, infrared messages emits from multiple probes or medical electrodes attached to a patient are for this information to be transmitted to a remote monitor; even when portable, in hand too holding analog-to-digital transmitters used for television games or for switching on and off and selecting channels in television receivers, white and infrared energy are used can send out is not possible. A portable telephone that receives and sends messages and by transmitting high frequency signals to the main telephone network connected is either very expensive or it cannot avoid undesirable interference; infrared transmission was previously not suitable for this application. In the examples above What is needed is a transmitter that can be powered by a small number of batteries so that it does not only becomes portable, but can also be housed in a small, hand-held case can.

With the help of the invention, a message transmission arrangement is therefore intended with improved properties and in particular an infrared communication arrangement be created. This arrangement should be equipped with a portable transmitter. This transmitter

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should be battery-powered. In addition, the invention is intended to enable the arrangement to be created to be used in the medical monitoring of a patient. Furthermore, the use of the arrangement to be created as a portable microphone or telephone should be made possible with the aid of the invention. The au-generating arrangement should also be suitable as one in the hand-held wireless remote control unit for TV games, ^r for the operation ^<on television sets and the like.

In the egg-infrared communication arrangement designed according to the invention a pulse position modulation method is used to transmit analog and / or digital information applied, in which so little energy is required that it is with a relatively small Bätterieversource source can work.

In one embodiment of the invention, the transmitter includes an input device that is connected to the input a voltage controlled pulse position modulation circuit connected is. At the output of the pulse position modulation circuit an infrared transmitter is connected. In some embodiments, the Input device and the modulation circuit a preamplifier circuit used, the from the input device incoming input signal filters and amplifies; it is in some applications, for example in the application to be described here in medicine, it is particularly important that the preamplifier circuit has a high Common mode rejection to filter out network interference (50 Hz or 60 Hz). The pulse position modulation circuit consists of a time control element * to which the signal coming from the input device is coupled and that generates output pulses by a predetermined

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- 13 -

Frequency by an amount that corresponds to the voltage value of the input signal. The input signal can be a variable DC voltage signal or an AC voltage signal. The output of the modulation circuit is coupled to the infrared light emitting transmitting device, so that this device according to the generated output pulses is activated and sends out infrared signal groups that are synchronized with the output pulses. Of the Receiver consists of an infrared photodetector that receives the infrared signal groups, as well as a demodulation circuit which converts the frequency deviation into an output signal. In a In a preferred embodiment, the demodulation circuit consists of a detector with a phase locked loop. The photodetector is connected to the phase detector via an amplifier stage and one or more intermediate frequency filter stages connected. A voltage is generated at an output of the phase detector that changes accordingly changes the input signal generated by the input device. At the output of the phase detector, additional Filters must be provided according to the particular application and the ambient conditions.

The invention will now be explained by way of example with reference to the drawing. Show it:

1 is a perspective view of a television game, the infrared communication arrangement according to the invention contains,

Figure 2 is a block diagram of the television game of Figure 1,

Fig.3a is a diagram of the pulses generated in each of two separate channels are generated for the multiple control units used in the television game of Figure 1 will,

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3b shows a diagram of the output signal of the first Channel assigned demodulator,

3c is a diagram of the output signal of the second Channel assigned demodulator,

4 shows a circuit diagram of a battery-powered infrared transmitter according to the invention,

5 shows a circuit diagram of a manually operable analog input potentiometer, that in the invention Arrangement for controlling the television game of Fig. 1 is used,

Fig.6 is a circuit diagram of an infrared receiver for the

first channel of the television game shown in Figure 1, with a similar one for the second channel Intended recipient,

7 shows a perspective view of an EKG monitoring system san arrangement in which the infrared communication arrangement formed according to the invention is applied,

8 shows a block diagram of the EKG monitoring arrangement of Figure 7,

9 is a circuit diagram of a preamplifier / filter circuit, which is used to have two electrodes used for medical purposes with the pulse position modulation circuit to be coupled in the EKG monitoring arrangement of FIG. 7, the pulse position modulation circuit is essentially designed as shown in Figure 4,

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FIG. 10 shows a block diagram of the receiver section of the EKG monitoring arrangement and FIG

FIG. 11 is a circuit diagram of the input section of the in FIG EKG monitoring arrangement used receiver, wherein the phase detector portion is formed is as shown in Fig.6.

The drawing shows two exemplary embodiments of the infrared communication transmission arrangement according to the invention shown. The application of the invention in a television game system is shown in Fig.1, and the use of the invention in a medical condition monitoring system, in particular an EKG monitoring system is shown in Fig. 7. First, referring to Fig. 7, the television game system will be described Figures 1 to 6 described. The television game system shown in Figure 1 consists of a main game module 10, In which the television game with the infrared receiver section for receiving an input control signal and is accommodated for the transmission of this input control signal for switching the television game. The output of the television game circuit is connected to the antenna input of the conventional television receiver 11 tied together. Two battery powered handheld control units 12A and 12B generate the Control signals in the form of infrared energy surges (subsequently also known as infrared signal groups) to the receiver section of the main game module 10 are transmitted. Each of the control units 10A and 10B includes a hand-operated operating stick 13A, T3B, which act analog (with a voltage controlled by a potentiometer) or digital

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can; the control units can contain a keyboard 14A, 14b for entering additional information, which are generally available in digital form. The control units are connected to the main game module 10 of the television game Via an infrared connection only, and not that currently used in television game systems used cable coupled. In addition, in contrast to known systems, those with infrared communication operate, the control units 12A and 12B portable, and they are fed exclusively from a battery, which in the embodiment to be described can consist of a simple 9V transistor radio battery. A block diagram of the television game system of Fig.1 is shown in Fig.2. According to Fig.2, each contains Control unit 12A and 12B have at least one input device, which in the present exemplary embodiment is a Manually operated, analog-acting input circuit 15A, 15B controlled by a potentiometer operating stick and optionally also includes digitally encoded input devices such as keyboards 16A and 16B; in other embodiments digital potentiometer control sticks could also be used. In each Control unit 12A, 12B is a pulse position modulation circuit 17A, 17B, which with its input is coupled to the input device 15A, 15B, so that it receives a variable voltage input signal generated by the input device. the Pulse position modulation circuits 17A, 17B include a Timing control element for generating pulses, the timing of which within a predetermined modulation range in relation to a reference frequency as a function

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can be controlled by the voltage value of the input signal. The reference frequencies for the control units 12A, 12B are sufficiently different from one another that an overlap is avoided in the present exemplary embodiment is a reference frequency of 5 kHz (channel I) in the control unit 12A and in the control unit 12B a reference frequency of 7 kHz (channel II) is set, as indicated in the diagram of Fig.3a. An infrared Light emitting transmitting device, for example a Light emitting diode, is connected to the pulse position modulation circuit 17A, 17B connected so that it receives the pulse-shaped output signal, the infrared transmitting device 18A, 18B bursts of infrared energy synchronized with the modulated Output pulses generated.

The receiver consists of at least one infrared photodetector 19, which receives the signals from the transmitting devices 18A, 18B detects bursts of infrared energy and a channel separation circuit 20 that separates the pulses from the Control unit 12A and signals transmitted by the control unit 12B. As with reference is explained in more detail in FIG. 6, separate photodetectors can be provided for each channel, with a photodetector for channel I is connected to a 5 kHz band filter, while a second photodetector for channel II is connected to a 7 kHz band filter “There are two demodulation circuits 21A and 21B are provided. The demodulation circuit 21A generates the deviation of the pulses of the modulator output signal from the 5 kHz reference frequency of the channel 1 indicating electrical signal, and the demodulation circuit 21B generates the deviation of the

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Pulses of the modulator output signal from the 7 kHz reference frequency of channel 2 indicating signal. That is, the demodulation circuit 21A supplies the game circuit 22, a signal representing the output signal of the analog input manual operation stick 15A indicates, and the demodulation circuit 21B supplies the game circuit 22 with an output signal representing the Position of the manually operated analog input operation stick 15B. The output of the demodulation circuit 21A of channel 1 is graphical in FIG. 3B as a function of the input frequency deviation shown; the output of the demodulation circuit 21B of the channel 2 is dependent on the Input frequency deviation shown graphically in Fig. 3c. ·

In Figures 4 to 6 are detailed circuit diagrams of the infrared communication system is Darge provides, which is applied in the television game system. The transmitter is referred to as a universal transmitter because it consists of an input signal, which can be a variable DC voltage signal, as is the case here television game described is used, or an amplitude or frequency modulated AC voltage signal can be, as is still to be described in connection with that to be described with reference to FIGS Monitoring system is recognizable, a pulse position modulated Can generate signal.

The transmitter shown in Fig.4 contains a voltage controlled Timing control circuit 23, for example a circuit of the type SN72555 from Texas Instruments

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Incorporated or of the type LM555 from National Semiconductor. The transmitter is fed from a battery B _1, for example a single 9 ^V transistor battery, the nominal operating voltage of the transmitter being between 6 and 9 V. The reference frequency of the timing circuit 23 is set with the aid of the resistors R ^ and Rc and with the aid of the capacitor C ^. For the control unit 12A, the timing circuit 23 is set to 5 kHz, and for the control unit 12B, the timing circuit 23 is set to 7 kHz. Frequency changes with the ambient conditions (temperature) and changes in the supply voltage are prevented with the help of a voltage control circuit, which has a diode D ₁ , a Zener diode D ₂ , resistors R. and. R., one Capacitor C ₃ and a transistor Q ₁ contains j this voltage regulating circuit generates _{a stable operating voltage Vgg from the battery voltage V ßB} supplied by battery B. The output signal of the timing circuit consists of a sequence of pulses that are selected in a selected manner with respect to the reference frequency corresponding to the voltage value of the Input signal at terminal 5 of the timing control element 23 are modulated. The output signal of the timing control circuit 23 is applied to the base of a transistor Q ₂ through a capacitor C-. The transistor Q ₂ switches the transistor Qy synchronously with the output signal of the timing circuit 23. When the transistor Q ₇ is switched, the capacitor C _{1 is} discharged through the transistor Q ₇ , with which the charge stored _{in the capacitor C 1 is controlled}

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will. The light-emitting diode LED therefore generates in time with the modulated output pulses of the timing circuit 23 Infrared bursts of energy.

There is a separate transmitter for each control unit 12A and 12B, as shown in FIG. in the In the present embodiment, a potentiometer 13A, which can be operated by means of a control rod, is 13B, of which a circuit diagram is shown in FIG. 5, is used to supply the time control circuit 23 with the input signal feed with controlled variable voltage. The analogue circuit assigned to the operating staff is present from a variable resistor R53, which is connected to a supply voltage source connected with low internal resistance between the positive terminal and ground is so that it emits a DC voltage at its output, which depends on the position of the operating rod 13A ^ 13B changes almost linearly between the positive supply voltage value and the ground value. The operating staff whose Circuit is coupled via the infrared transmission path with the television game, for example, the Control the vertical movement of an image on the TV screen to simulate a racket that hits the moving image of a ball can be taken. By adding more channels, both a horizontal as well as a vertical position adjustment can be realized; in this case additional reference frequencies were used used. The frequencies 5 kHz and 7 kHz could be used to adjust the vertical position of the two clubs The frequencies 9 kHz and 11 kHz could be used for the horizontal position adjustment of the two clubs will. Additional channels can be used, for example, to transmit digital signals, for example from a keyboard to be used. This is due to a selective deviation

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of the transmitted pulses from a selected one. Reference frequency achieved; for example, a negative deviation can indicate a bit with the value "0" while a bit with the value "1" can indicate a positive deviation. The signals are demodulated in the receiver in such a way that that they indicate the keys pressed and control the game accordingly.

In the embodiment described here with two channels, two receivers are used. Each recipient generates a DC output voltage supplied to a control input of the television game circuit 22; these control inputs are the same inputs that the stick control circuit shown in Fig. 5 is normally connected to Connects directly to conventional television games via cable.

According to Figure 6, the receiver includes a photodetector circuit with resistors R25 to R28, a capacitor C11 and an infrared phototransistor Q3, the receives the infrared energy pulses generated by the light-emitting diode LED and a pulse-shaped electrical signal supplies a preamplifier via the capacitor C12. ■ The preamplifier consists of resistors R30 to R33 and a transistor Q4. The output signal of the preamplifier is via the capacitor C13 and the resistor R34 to an amplifying bandpass filter from the resistors R35 to R39, the capacitors C14 to C17, the coils L2 and L3 and the operational amplifiers Transfer A3 and A4. The reinforcing band filter is e.g. for channel I to 5 kHz and for channel II

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tuned to 7 kHz. The filtered signals then become one of a phase-locked loop via capacitor C19 Formed phase detector 24 transmitted, which detects the leading edge of the transmitted signal. The phase detector can be of the type LM565 manufactured and sold by National Semiconductor will. The adjusted output voltage supplied by the terminal 7 of the phase detector 24 and an am Terminal 6 of the phase detector 24 supplied reference voltage are fed to the operational amplifier A5, which provides the DC output voltage for the television game described above has been described. The voltage controlled output signal of the phase detector is shown in Figure 3b for channel I and in Figure 3c for channel II.

Another embodiment of the invention serves as part of a medical condition monitoring system, in particular an 'EKG monitoring system in which a AC voltage signal derived from the skin of a cardiac patient in a hospital with the help of infrared energy to a receiver located in the patient's room. The recipient can send a Be part of a cardiac monitoring system that is used to determine and monitor the patient's condition; however, the receiver can also be located remotely from this system. The EKG monitoring system will will now be described with reference to Figures 7-11.

According to Figο7, the EKG monitoring system includes two Electrodes, 30 and 31 »those of galvanic silver chloride / silver sensors are formed that sense the tension generated by the body; this tension has a value

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on the order of 1 mV. The electrodes are connected to a portable, battery-powered infrared transmitter 32, which amplifies the electrical signals detected by the electrodes 30 and 31 and transmits them to the EKG monitor 32A Pulse position modulation circuit 25, the input of which is connected to the electrodes and the output of which is connected to a transmitting device 26 which emits infrared light. The EKG monitor 32A contains an infrared photodetector, which receives the information transmitted by the transmitting device 26. The photodetector converts the infrared energy into an electrical signal which is demodulated by the demodulation circuit 28. The output of demodulation circuit 28, which is a representation of the signal applied to the system from electrodes 30 and 31, is displayed on a permanent or non-permanent copy display device. The display device 29 may be mounted at a location remote from the photodetector 27; for example, the photodetector 27 may be located in a patient's hospital room while the display device is attached to a monitoring center.

In Fig.9 is a circuit diagram of the input stage of the transmitter 32 shown. The electrodes 30 and 31 are connected between the terminals 33 and 34-, and they are with the Inputs of a differential amplifier Af via capacitors C7 and C8 coupled. The differential amplifier A1 is over Capacitors C9 and C10 as well as resistors R17 and R18 coupled to a second operational amplifier A2. The amplifiers A1 and A2 are used to do this in the millivolt range

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to amplify the lying output signal of the electrodes; they also serve as filters with high common-mode rejection of the order of 100 dB, so that network disturbances (50 Hz or 60 Hz) are essentially filtered out are generated by nearby electrical power lines.

The output signal of amplifier A2 becomes the 1-input of the pulse position modulation transmitter of FIG. 4 via a resistor R22 and a capacitor C5. That The signal generated by the electrodes has a frequency of the order of 3 to 400 Hz, which is thus the frequency of the Input signal of the; Is the pulse position modulation circuit of FIG. In this application, the timing circuit is 23 set to a reference frequency of 44 kHz. The time control circuit 23 thus generates at its output a jjulslagemodulated signal, in which the temporal position of the pulses with respect to the 44 kHz reference frequency signal is controlled by a deviation caused by the changing amplitude of the supplied by the electrodes Input signal depends. The infrared light emitting light-emitting diode «LED is connected to the transistors Q2 and Q7 connected to the output of the time control circuit 23, so that they are in time with the output pulses of the time control circuit 23 Infrared bursts of energy generated.

The block diagram of the receiver is shown in Fig. 10. According to Fig.10, an infrared photodetector receives the infrared bursts of energy generated by the light-emitting diode of the Transmitter of Figure 4 have been generated; The photodetector generates a pulse in time with these bursts of energy electrical signal. The output signal of the photodetector is amplified in an intermediate frequency filter 36 and

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filtered, and the output signal of this filter is fed to a phase detector 37 containing a phase locked loop. The phase detector 37 generates an electrical signal, which in the present exemplary embodiment is an alternating current signal, the amplitude and frequency of which change in accordance with the input signal supplied by the electrodes 31 and 31. The output signal of the phase detector 37 is passed through a φ Hz filter 38, which filters out network disturbances which can be caused by network lines in the vicinity of the receiver and the transmitter. Since the frequency of the signal generated by the electrodes is in the range of 300 to 400 Hz, which is essentially the same frequency as the frequency of the signal at the output of the phase detector 37, a low-pass filter 39 is inserted between the phase detector and the EKG monitoring system.

A detailed circuit diagram of the infrared photodetector 35 and the intermediate frequency filter 36 is shown in FIG. The phase detector 37 essentially agrees with the phase detector formed by a phase locked loop according to Fig.6. The 60 kHz filter 38 and the low pass filter 39 are conventionally constructed so that they not be explained in detail here.

The EKG monitoring system, which is a cathode ray tube or a device for producing a permanent Recording contains is also of conventional construction, so that it is not explained in more detail here.

Referring to Figure 11, the infrared photodetector circuit includes 35 a phototransistor Q5, which with the help of resistors R54, R56 and R58 are biased. Of the

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2618930

Transistor Q5 provides a pulsed electrical Signal in time with the bursts of infrared energy emitted by the light-emitting diode LED via a capacitor C24 to the base of amplification transistor Q6. The amplified output of transistor Q6 becomes , with the help of a capacitor C25 and a resistor R.62 transmitted to the intermediate frequency filter 36, which essentially consists of a differential amplifier A5 and an operational amplifier A6. The output signal of the operational amplifier A6 is with the help of a Transfer capacitor C29 to phase detector 37.

The values of the components used in the above exemplary embodiments are those at the end of the Description given in Table I attached.

There are various embodiments of the infrared communication system according to the invention as well as their application have been described. Other systems for arranging the inventive Arrangement can, for example, be a microphone or telephone transmitter as the input device included, which supplies input signals to the transmitter shown in FIG. the microphone or the telephone can thereby be made wireless. The invention is also suitable for use in Connection with other analog or digital information transmission over relatively short distances, where it is desirable to power the transmitter from a battery and make it portable.

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- 32 Table I.

Component vert

R1 1.2 kilohms

R2 33 kilo ohms

R3 3.3 kilohms

R4 set to f

R5 ij8 kilohms

R6 33 kilohms

Component value

R7 100 kilohms

R8 820 ohms

R9 100 kilo ohms R10 16 kilo ohms R11 2-7 ohms

C1 64o AiF

Component value

C2 1

25 / uF

C4 adjusted to f C5 2 uFl not po-C6 2JuF] larized

Preamp / filter

R12 220 Kilohms R19 220 kilohms R63 1 kiloohm C8 1 / iF
VuF
1 JuF R13 220 Kilohms R20 220 kilohms R65 68 kilohms C9 10 vtaF R14 51 Kilohms R21 47 kilohms R66 1 kilohm C10 CA-3000 (RCA) R15 51 Kilohms R22 680 Ohm R67 39 kilohms .C5 SN25741 R16 12th Kilohms R23 220 kilohms R68 68 kilohms A1 ι R17 22nd Kilohms R24 680 kilohms C22 0.1 uF
C23 1 / lF A2 R18 22nd Kilo ohms " C7 1 WF C24 820 pF 0.1 uF TV ehs-game receiver C25 0.05 JuF 0.1 ^ uF R25 150 Kilohms C13 0.1 JiF R26 13th Kilohms R46 as required C15 0.0OB JiF R27 33 Kilohms R42 2.7 kilohms C17 0.1 μ * R28 13th Kilohms R43 2.7 kilohms C18 0.001 AiF R30 350 Kilohms R44 5 kiloohms C19 upon need R31 27 Kilohms R45 10 kilohms C20 25 JiF R32 5.6 Kilohms R47 '47 kiloohms
R48 47 kilohms C21 SN72748 R33 270 ohm R50 390 kilohms C22 SN72748 R34 2.2 Kilohms R51 100 kilohms A2 SN 72741 R35 2.2 Kilohms R52 470 kilohms A4 5 kilo ohms R36 39 Kilohms Ci 1 1-2 uF
C12 0.1 ^ uF A5 37 mH R37 330 Kilohms R53 37 mH R38 2.2 Kilohms L1 37 mH R39 39 Kilohms Input stage of the ECG receiver L2 Kilohms L3 8 pF Kilohms set äff R54 15th Kilohms C 26 1000 pF R55 150 Kilohms C 27 0.05 / uF R56 100 Kilohms C 28 .31 10 / uF R57 • 12 Kilohms C29 TIL-81 R58 150 Kilohms C30 2N930 R59 5.6 Kilohms Q5 SN72748 R60 330- ohm Q6 SN72741 R61 33 A5 R62 240 A6

Claims (1)

German engineer Dipl.-Chem. Dipl.-Ing. E. Prince - Dr. G. Hauser - G. Leiser Ernsbergerstrasse 19 8 Munich 60 Our reference: T 3041 April 25, 1978 TEXAS INSTRUMENTS INCORPORATED 13500 North Central Expressway Dallas, Texas, V.T.A. Claims iJ infrared communication arrangement, marked by (a) a transmitter module with (I) an input device for generating an input signal, (II) a voltage controlled pulse position modulation circuit connected to the input device and a timing device for generating a reference frequency pulse signal and a pulse generating device connected to the timing device, the pulses in a controllable time position within a predetermined modulation range with respect to the pulses of the reference frequency pulse signal depending on the voltage value of the Schw / Ba 803-844 / 1072 ORIGINAL INSPECTED Input signal generated, (III) an infrared transmitter connected to the pulse modulation circuit is connected to receive the pulses generated by this circuit and Infrared signal groups synchronized with the pulses generated by the pulse position modulation circuit supplies, and (b) a receiver module with (I) an infrared photodetector that depends on the received infrared signal groups sent by the Infrared transmitting device is generated, an electrical signal changes, so that an electrical A signal is generated that is keyed synchronously with the infrared signal groups, (II) a demodulation circuit connected to the infrared photodetector is connected and generates an output signal that shows the deviation of the pulses of the electrical signal from the reference frequency, and (III) one connected to the demodulation circuit Device controlled by the output signal. 2. Arrangement according to claim 1, characterized by a voltage regulator connected to the pulse position modulation circuit for supplying an almost stable reference voltage to the timing device regardless of changes in environmental conditions. 3. Arrangement according to claim 1, characterized by a driver circuit, which connects the pulse position modulation circuit to the infrared transmitting device. 808844/1072 #. Arrangement according to claim 3, characterized in that the driver circuit includes a capacitor device which in the course of the time periods in which of the modulation circuit does not emit a pulse, stores a charge and when the generated pulses to the infrared transmitting device discharged. 5. Arrangement according to claim 1, characterized in that the infrared transmitting device is an infrared light emitting diode. 6. Arrangement according to claim 1, characterized in that the infrared photodetector is an infrared phototransistor is. 7. Arrangement according to claim 1, characterized by a Amplifier that combines the infrared photodetector with the phase detector circuit connects. 8. Arrangement according to claim 1, characterized by a Intermediate band filter connecting the infrared photodetector to the phase detector circuit. 9. Arrangement according to claim 1, characterized in that the phase detector circuit is a phase locked loop contains. 10. The arrangement according to claim 1, characterized by a notch filter which the phase detector circuit for suppression of AC voltage interference from power lines connects to the controlled facility. 11 · * arrangement according to claim 1, characterized by a battery for supplying energy to the transmitter module. 809844/1072 12. Infrared communication arrangement in the Application to a television game system, characterized by (a) at least one portable, battery-powered control unit (i) a player controllable input device for generating an input signal to control the course of the television game, (II) a voltage controlled pulse position modulation circuit connected to the input device and a timing device for generating a reference frequency pulse signal and an on the timing device connected to the pulse generating device contains the pulses in a controllable time position within a predetermined Modulation range with respect to the pulses of the reference frequency pulse signal dependent generated by the voltage value of the input signal, (III) an infrared transmitting device connected to the pulse modulation circuit is connected to receive the pulses generated by this circuit and Infrared signal groups synchronized with those from the Pulse position modulation circuit supplies generated pulses, (b) a receiver module with (I) an infrared photodetector that depends on the groups of infrared signals received by the Infrared transmitting device is generated, an electrical signal changes, so that an electrical A signal is generated that is keyed synchronously with the infrared signal groups, 809844/1072 (II) a demodulation circuit connected to the infrared photodetector is connected and generates an output signal that shows the deviation of the pulses of the electrical signal from the reference frequency, (c) an electronic game circuit with a control input connected to the demodulation circuit, the electronic game circuit depending on the Output signal of the demodulation circuit the course of the game certainly. 13. Arrangement according to claim 12, characterized by one connected to the pulse position modulation circuit Voltage regulator for delivering an almost stable reference voltage to the timing device independently of Changes in environmental conditions. 14. Arrangement according to claim 12, characterized by a driver circuit which the pulse position modulation circuit connects to the infrared transmitter. 15. Arrangement according to claim 14, characterized in that that the driver circuit includes a capacitor device which in the course of the time periods in which of the Modulation circuit no pulse is sent out, one Charge stores and is discharged to the infrared transmitting device when the generated pulses occur, so the infrared transmitting device is supplied with energy. 16. The arrangement according to claim 12, characterized in that the infrared transmitting device is a diode that emits infrared light. 8098A4 / 1072 17. Arrangement according to claim 12, characterized in that that the infrared photodetector is an infrared phototransistor. 18. The arrangement according to claim 12, characterized by an amplifier, the infrared photodetector connects to the phase detector circuit. 19. The arrangement according to claim 12, characterized by a band filter which the infrared photodetector with the Phase detector circuit connects, the bandpass filter being tuned to the reference frequency. 20. Arrangement according to claim 19, characterized in that that the phase detector circuit is a phase locked loop contains. ► Arrangement according to claim 12, characterized in that the player controllable input device includes a variable potentiometer with a hand control device, the potentiometer to a Voltage source can be connected so that a direct voltage ssignal is generated which changes according to the position of the hand control device. 22. The arrangement according to claim 12, characterized in that the input device controllable by the player contains one or more key operated switches. 23. Arrangement according to claim 22, characterized in that each key switch generates a binary signal, which is sent out by the control unit in the form of pulses related to the reference frequency to lead or lag depending on the corresponding binary state. 809844/1072 24. Infrared communication arrangement in the Application to a television game system, characterized by (a) multiple portable, battery-powered control units with (I) an input device controllable by a player for generating an input signal for controlling the course of the television game, (II) a voltage-controlled pulse position modulation scarf device connected to the input device and a timing device for Generation of a reference frequency pulse signal and a pulse generating device connected to the timing device, which Pulses in a controllable time position within a predetermined modulation range with respect to of the pulses of the reference frequency pulse signal generated depending on the amplitude of the input signal, the reference frequency pulse signal is different for each of the multiple control units, and (III) an infrared transmitting device, which is connected to the PuIslagemodulationsschä. device is connected to receive the pulses generated by this circuit and Infrared signal groups synchronized with the pulses generated by the pulse position modulation circuit delivers, (b) a receiver module with (I) an infrared photodetector that depends on the received infrared signal groups sent by the 8098U / 1072 Infrared transmitting device is generated, an electrical signal changes, so that an electrical A signal is generated that is keyed synchronously with the infrared signal groups, (II) filter devices connected to the infrared photodetector and on the reference frequencies each of the control units for separating those corresponding to the respective control units keyed signals are matched, (III) a demodulation circuit connected to the filter devices for generating separated Output signals, each of which is the deviation of the pulses of the electrically sampled signal from the Display the reference frequency of the respective control unit, and (c) an electronic game circuit with several control inputs, each for receiving the separate output signals are connected, whereby the electronic game circuit controls the course of the game depending on the separate output signals. 25. Arrangement according to .Anspruch 24, characterized by Voltage regulators in each control unit connected to the pulse position modulation circuit and the timing devices of the control units an almost stable reference voltage regardless of changes the ambient conditions. 809844/1072 26. The arrangement according to claim 12, characterized by a driver circuit of each control unit which the respective pulse position modulation circuit with the Inffcarot transmitting device connects. 27. Arrangement according to claim 26, characterized in that each driver circuit has a capacitor device contains, which in the course of the time periods in which no I.tduIs emitted by the respective modulation circuit is, stores a charge and when the generated pulses occur from the associated Modulation circuit to the infrared transmitting device discharges. 28. Arrangement according to claim 24, characterized in that each infrared transmitting device consists of an infrared light emitting diode. 29. Arrangement according to claim 24, characterized in that the infrared photodetector is an infrared phototransistor. 30. Arrangement according to claim 24, characterized by an amplifier in the receiver module, the infrared photodetector connects to the filter device. 31. Arrangement according to claim 24, characterized in that the filter devices consist of a plurality of belt filters exist, which are each matched to the reference frequency of one of the control units. 32. Arrangement according to claim 31, characterized in that the band filters are each formed by operational amplifiers are. 33. Arrangement according to claim 12, characterized in that the demodulation circuit consists of a plurality of detector circuits 809844/1072 is formed with a phase-locked loop, with a phase detector circuit for each reference frequency is provided. 34. Arrangement according to claim 24, characterized in that the input device controllable by the player is a variable potentiometer with a hand-held device, the potentiometer being connected to a Voltage source can be connected so that a DC voltage signal which changes according to the position of the handheld controller. 35. Arrangement according to claim 24, characterized in that the input device controllable by the player contains one or more key operated switches. 36. Arrangement according to claim 35, characterized in that that the key switch generates a binary signal, which is sent out by the control unit in the form of pulses related to the reference frequency of the control unit depending on the corresponding binary Leading or lagging the state in terms of time. 37 · ■ Infrared communication arrangement when in use in a medical system for monitoring the condition of a patient by (a) a portable, battery-powered transmitter module with (i) electrodes attachable to the human body to receive electrical signals generated by the body, (II) a voltage controlled pulse position modulation circuit, the one with the electrodes 809844/1072 and a timing device for generating a reference frequency pulse signal as well as a pulse generating device connected to the timing device, the pulses in a controllable temporal position within a predetermined modulation range with respect to of the pulses of the reference frequency pulse signal depending on the amplitude of the input signal generated by the electrodes, and (ill) an infrared transmitter connected to the pulse modulation circuit is connected to receive the pulses generated by this circuit and Infrared signal groups synchronized with the pulses generated by the pulse position modulation circuit supplies, and (b) a receiver module with: Cl) an infrared photodetector that depends on the received infrared signal groups generated by the infrared transmitting device electrical signal changes so that an electrical signal is created that is synchronous with the infrared signal groups is keyed, (II) a demodulation circuit connected to the infrared photodetector is connected and generates an output signal that shows the deviation of the pulses of the electrical signal, of the reference frequency, the output signal being that of the Electrodes generated electrical signal corresponds, and (III) one connected to the modulation circuit monitoring device acting on the output signal 809844/1072 responds and monitors and / or displays the patient's condition. 38. Arrangement according to claim 37, characterized in that the electrodes consist of two galvanic silver chloride / silver sensors exist. 39. Arrangement according to claim 37 »characterized by a Preamplifier that modulates the electrodes with the pulse position ons circuit connects. 40. Arrangement according to claim 37, characterized by a connecting the electrodes to the modulation circuit Filter device with high common mode rejection for filtering out AC voltage interference caused by Power lines are generated in the vicinity of the transmitter module. 41. Arrangement according to claim 37 »characterized by a Voltage regulating circuit that has a battery with the pulse position modulation circuit connects and the timing device an almost stable reference voltage independently of changes in environmental conditions, thus providing a nearly stable reference frequency for the timing device is delivered. 42. Arrangement according to claim 37, characterized by a Driver circuit that controls the pulse position modulation circuit connects to the infrared transmitting device. 43. Arrangement according to claim 37, characterized in that the driver circuit includes a capacitor device which in the course of the time periods in which of no pulse is sent to the modulation circuit, stores a charge and discharges to the infrared transmitting device when the generated pulses occur. 8098U / 1072 44. Arrangement according to claim 37, characterized by a Amplifier that connects the infrared photodetector with the phase detector circuit. 45. Arrangement according to claim 37, characterized by a band filter tuned to the reference frequency, which scales the infrared photodetector with the phase detector tion connects. 46. Arrangement according to claim 37, characterized in that the phase detector circuit is a phase locked loop contains. 47. Arrangement according to claim 37, characterized by a notch filter, which the phase detector circuit in the medical monitoring unit connects and. AC voltage interference from power lines in the Close to the receiver module suppressed, the notch filter on the frequency of the AC voltage interference is matched. 48. Arrangement according to claim 37, characterized by a filter with a high cut-off frequency, which the phase detector circuit connects to the monitoring unit and suppresses high frequency interference in the output signal the phase detector circuit are transmitted. 49. Arrangement according to claim 37, characterized in that the monitoring unit is a television reproduction device to display the patient's condition. 50. Arrangement according to claim 37, characterized in that the monitoring unit produces a permanent copy Includes recorder for recording the condition of the patient. 809844/1072 51. Arrangement according to claim 37 »characterized in that the monitoring system monitors the patient's EKG will. 52. Arrangement according to claim 37 »characterized in that the transmitter module has devices for attachment to the body of the patient. 53. Arrangement according to claim 37, characterized by several Transmitter and receiver modules, whereby the receiver modules are installed in the respective rooms of the patients, while each monitoring unit is in a central location. 809844/1072