JPS6031394A - Synchronizing system of key telephone set - Google Patents

Abstract

PURPOSE:To simplify the circuit by coupling a master device and telephone sets with 2 pairs (4 wires) of wiring cables, using a pair for the transmission line for data transmission/reception between the master device and the telephone set and using other one pair for the power supply from the master device to the telephone sets and also using the power supply line to the transmission of synchronising pulse. CONSTITUTION:A master device power supply ME supplies power to each circuit in the master device ME and supplies power to cables #1CB-#nCB via impedance circuits #1MP-#nMP. In transmitting/receiving the voice and control signal among the master device ME and the telephone sets #1TEL-#nTEL, a synchronizing pulse is transmitted from the master device ME to the telophone set TEL via a cable CB, the voice data pulse is fed from the master device ME to the telephone set TEL via the cable CA, then the synchronizing pulse is fed again from the master device ME to the telephone set TEL, and the data pulse of the control signal is transmitted from the master device ME to the telephone set TEL via the cable CA serially respectively, and the synchronizing pulse, the voice data pulse and the control signal data pulse are transmitted from the telephone set TEL to the master device ME, and the said various pulses are transmitted further alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for synchronizing transmission signals of a digital electronic button telephone device.

It is possible to send and receive audio signals and signals for information equipment over the same telephone line, and the signals for audio and information equipment can be processed using the same digital processing, and all circuits can be configured with digital circuits, making it easy to integrate into LSI. For various reasons, the telephone lines of various telephone devices are increasingly being digitized), and the field of button telephone devices is no exception. In a digitized telephone device, digitized voice signals and control signals for lamps, keys, etc. are transmitted and received between the main device and the telephone. In the transmission of digital signals, the digitized audio signal and control signal are separated and demodulated, so it is important to ensure synchronization between the transmitting side and the receiving side of these digital signals.

Conventionally, in order to synchronize digitized transmission signals, K,
(On the i side, a synchronization signal consisting of a bit string of a specific pattern is divided into the digital signal to be transmitted and sent, and on the receiving side, the bit string of the specified turn is extracted from the transmitted digital signal.) A method was used to reproduce the synchronization signal. However, in this conventional method, since the bit string of the specific pattern constituting the synchronization signal cannot be included in the bit string obtained by digitizing at least the audio signal and the control signal, the configuration range of the information transmission bit string becomes narrow; Synchronization signals need to be composed of a large number of bits in order to distinguish them from other information (audio signals, control signals), and in order to transmit such multi-bit synchronization signals,
There are disadvantages in that the transmission time width of the other information is narrowed, and the circuit configuration becomes complicated due to the identification of the synchronization signal and the extraction of the main turn. The present invention has been made to improve this drawback.

The present invention connects the main device and the telephone with two pairs (four wires) of wiring cables, one pair of which is used as a transmission path for data transmission and reception between the main device and the telephone, and the other pair is used as the main device. This is used to supply power from the device to the telephone, and the power supply line is used for full synchronous/N6 pulse transmission, thereby simplifying the circuit. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of the embodiment.

C) In Figure 1, the crown is the main device, the phone is the telephone, CA is the cable for data pulse transmission, CB is the cable for power supply and synchronization pulse transmission, J and V-T/R are digital S/TA is a data pulse transmitting/receiving circuit that transmits and receives encoded audio and control signals, S/TA is a synchronizing pulse transmitting/receiving circuit that transmits and receives synchronizing signals, and COD is a conversion that mutually converts analog signals such as audio and coded serial digital pulse trains. The circuit, TCPU, controls various aspects of the telephone, such as lamp display, based on control signals from the main unit, and also controls the conversion of key press information at the end of the phone into a serial digital pulse train and sends it to the main unit. MCPU is a control circuit that controls the communication path, creates and sends control signals to the telephone A, and processes key information from the telephone back, XT is the communication path switch, and ■W is the main device. The power supply circuit IMF is an impedance circuit that exhibits high impedance to synchronization pulses and low impedance to direct current, and TPW is a power supply circuit within the telephone. Note that the circuit configuration of the telephone rear end is the same for all telephones, and FIG. 1 shows only the first telephone position.

FIG. 2 shows an example of the transmission format of data pulses and synchronization pulses according to the embodiment of the present invention, where ■ is an audio signal converted into digital data sent from the main unit to the telephone end; ■ is a control signal such as a lamp display sent from the main device ME to the telephone rear end, ■ is an audio signal converted into digital data sent from the telephone rear end to the main device section, and ■ is a control signal sent from the telephone rear end to the main device. Control signals such as key presses sent to ℃, ■ and ■ are synchronization i4 pulses sent from the main device ME to the telephone rear end, and ■ and ■ represent synchronization pulses sent from the telephone rear end to the main device section. ing.

In the main device hm, the data pulse transmitter/receiver circuit V
-T/R, synchronous pulse transmitting/receiving circuit S-T/R, and impedance circuit IMF are provided one each for each telephone position.
' CA -” ” CA Ha'ch 1 pair (2
The data pulse transmitting/receiving circuit of each telephone is set up and the data pulse transmitting/receiving circuit of the TA and the main unit is "V-TA-""V = T/R
Also, each cable≠'CB-≠”C
B consists of one pair (two wires) each, and each phone ≠'
Synchronous pulse transmitter/receiver circuit 5-TAL and main unit synchronous pulse transmitter/receiver circuit ÷1S-Thiko~”S-
Connect the T/R, and then connect the impedance circuit in the main unit through the IMF and each telephone.
The main unit's power supply circuit MFW and each telephone set are connected via the impedance circuit IMF located at the
Connect and switch off the 4Pn source circuit TPW.

Further, in the main device MP, each data pulse transmitting/receiving circuit 41v-1'QaT is accommodated in a communication path switch XT, and in the back of the telephone, a data pulse transmitting/receiving circuit V-
The T/R is connected to a conversion circuit COD, which is further connected to a voice transmitting/receiving means (such as a handset) although not shown in the figure.

Power is supplied from the main device ≠I to each telephone in the following manner.

In other words, the main device power supply section supplies %w to each circuit in the main device section, and also supplies %w to each circuit in the main device section, and also supplies %w to each circuit in the main device section.
P 〜” ” IMP f-type each cable 7” CB
``Power is also supplied to CB.
1, the power supply circuit TPW receives power from each of the cables + ICB N+ ncB via the impedance circuit IMP, converts it to a predetermined voltage in the power supply circuit PW, and then supplies power to each circuit. Therefore, the power supply circuit TPW is essentially a voltage stabilization circuit having a voltage conversion function.

Voice and control signals are exchanged between the main unit and each telephone set +' and -4Pn in the following manner.

That is, first, the synchronization pulse is sent from the main device ME to the telephone device via the cable CBf, then the voice data pulse is sent from the main device section to the telephone device via the cable CA, and then, in the same way as above, the synchronization pulse is sent again to the main device. Data pulses of control signals are serially transmitted from the main unit to the telephone device via the cable CA, and then from the main device section to the telephone device. Next, synchronization pulses, audio data pulses and control signal data pulses are sent from the telephone device to the main unit section in exactly the same order as above, and thereafter each of the above-mentioned fffl pulses is transmitted alternately.

The above operation will be explained in more detail using FIG. Under the control of the control circuit MCPH, the above-mentioned telephone is connected to the above-mentioned central office line or the above-mentioned other telephone via the communication path switch XT.
Information is exchanged with the equipment. That is, the synchronization system of the present invention can be understood by explaining the transmission and reception of synchronization pulses and data pulses between the telephone station and the communication path switch XT of the main unit.

When transmitting a digitized audio signal, that is, audio data pulse train ■, from the main device section to the telephone Φ' position, the main device section is controlled by the control circuit MCPU to send the audio data pulse train ■ first. , synchronous pulse transmitter/receiver circuit 'l'
Output the synchronization/arm pulse ■ from outside the s-T, and then output the data/
The audio data pulse train (■) is output from the outside of the signal transmitting/receiving circuit (S1V/T).

Next, when transmitting a control signal such as lamp lighting information, that is, a control data pulse train ■, from the main unit to the telephone, the synchronization pulse transmitting/receiving circuit transmits a synchronization pulse ■ prior to the control data pulse train ■. s-'r, i, and then a control data pulse train (2) is output from the data pulse transmitting/receiving circuit ≠'V-T/R.

The above synchronizing pulses ■ and ■ are originally transmitted to the telephone device via cable CB, which is a power supply line, but in the main device section, an impedance circuit IMF is inserted between power supply circuit MPW and cable CB. ), telephone) 3, an impedance circuit is inserted between the power supply circuit TPW and the cable CB, so the power supply circuits MPW and TB
The transmission loss of the synchronization pulse due to W is extremely small and can be virtually ignored.

``Telephone `` 1 position, couple as above ''
The above-mentioned audio data pulse train ■ and control data pulse train ■ transmitted by CA are data pulse transmission/reception circuit V-T/
In R, the synchronous pulse ■■ is the synchronous pulse transmitter/receiver circuit S-T
/R respectively, and under the control of the control 1 circuit TCPU,
In the conversion circuit COD, based on the pulses (1) and (2), the audio data pulse train (2) is converted into an analog signal, that is, normal audio, in synchronization with the timing of transmission from the main unit.
and the control data pulse train (1) are respectively demodulated into control information, the above-mentioned sound is emitted from a speaker or receiver (not shown) in the telephone set, and various controls such as lamp display are performed.

÷1 Transmission of voice and control data pulse trains ■, ■ and synchronization pulses ■, ■ from the telephone set to the main device ME is performed in the opposite direction to the above, but the data pulse transmitting/receiving circuit v-
The transmission operation in this case can be easily understood since both the TA and the synchronous Norse transmitter/receiver circuit S·'≠ are bidirectional.

Note that the audio signal input from the microphone or transmitter of the telephone device is sent to the conversion circuit CO before being transmitted to the main device.
Needless to say, it is converted into a digital signal (voice cheater/seven pulse sequence) by D.

Synchronous pulse ■, voice data zf from the telephone
& x sequence ■, synchronization pulse ■ and control data pulse train ■
are transmitted to the main device in this order, the main device section, under the control of the control circuit MCPU, synchronizes the above-mentioned voice data pulse train ■ with the sending timing from the telephone set based on the synchronization signal ■. It is switched by the communication path switch XT and sent to the central office line or other telephones, or the control data pulse train ■ is also synchronized with the transmission timing from TE and L by synchronization/Grus ■. After being converted into control information, the control circuit MCPU
Processed by l/fi.

As described above, according to the present invention, a method is adopted in which synchronization pulses are transmitted and received through a transmission path different from the transmission path for transmitting and receiving digitized audio signals and control signals, which was necessary in the conventional method. There is no need for a circuit for extracting the synchronized i4 signal, which simplifies multiple circuits, and since the power supply line can be used as the transmission path for the synchronized signal, there is no need to increase the number of cables. In addition, since it is often necessary to distinguish between synchronization/9 pulses, audio signals, and control signals based on the bit configuration, the 474 configuration of the synchronization i4 pulse is improved and simplified (for example, it is possible with a 1-pit configuration), and the audio signal The present invention has many advantages such as expanding the bit configuration range and transmission time d], and its effects are extremely significant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of various examples.耶′...Main device Setting...Telephone CA, CB...Cable■・T/R...Data zRrus transmission/reception circuit S=Tβ・
...Synchronous pulse transmission/reception circuit MPW...Main device power supply circuit TPw...Telephone power supply circuit IMF...Impedance circuit, Procedural amendment 3 Relationship with the case of the person making the amendment Applicant 1 1゛Name abbreviation) Myojo Denki Co., Ltd. 4 Agent address: 330, Shigesu Building, 2-8 Marunouchi, 2-6, Marunouchi, Daita-ku, Tokyo 2 Amendment: We hereby amend the following matters in the specification of this application. In the second line of page 1 and page 2, the word ``to be carried out'' has been corrected to ``to be carried out.'' 2. In the 5th line from the bottom of page 6, ``Main device power source MEJ'' is corrected to ``Main device power source MPW''. 3. On the 2nd line of page 7, "Power supply circuit PW J" should be corrected as "Power supply circuit TPW J." 4. On the 10th line of page 9, "Impedance circuit" should be changed to "Impedance circuit IMF. ” he corrected. 5. On page 9, line 11, correct ``r TBW J'' to ``TPW J.'' 6. On page 10, line 6 from the bottom, ``what is converted?'' should be changed to ``what is converted.'' I am corrected. 7. Page 11, lines 3-4 K Correct the phrase "control data pulse train ■" to "control data pulse train ■."

Claims (1)

[Claims] 1. In a digital telephone device that performs communication and control by transmitting and receiving digital signals, the transmission of synchronization signals between the main device and the telephone is replaced by the transmission of voice and control signals. This is a synchronization method for telephone equipment that is characterized by the fact that the transmission is carried out on a transmission line separate from the telephone line. 2. A synchronization method for a tan telephone device according to claim 1, in which a power supply line is used as a transmission path for a synchronization signal.