JPS60248033A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To eliminate the need for troublesome switch operation by changing over a handset to the position of the stand-by mode when the handset is set to the base unit. CONSTITUTION:When the handset HS1 is set to the base unit BU2, since a battery 171 is charged via charging terminals 172, 272, a charge detecting circuit 173 applies a charge detecting signal CHRG of logical 1 level to a microcomputer 140. Then the microcomputer 140 brings the HS1 to the stand-by mode regardless of the switching position of a talk switch SW152. Thus, even when an SW152 is not operated and when a telephone call comes externally, the telephone set responds surely thereto. When the HS1 is not set to the BU2, the SW 152 is thrown to the position of contact T, the mode is brought into the talk mode, talking is attained and when the SW152 is thrown to the position of contact S at the end of call, the mode is brought into the stand-by mode.

Description

[Detailed description of the invention] Industrial applications This invention relates to cordless telephones.

BACKGROUND ART AND PROBLEMS The telephone cord of a typical telephone is connected to a rosette attached to a pillar, wall, or the like. Therefore, the range within which the telephone can be moved is determined by the length of its telephone cord, and is approximately several meters. However, if you lengthen the phone cord to increase the range of movement, the cord can become tangled or get in the way.

Therefore, in the United States and other countries, a telephone system called a cordless telephone is being considered.

As shown in Fig. 1, it consists of a transceiver (fl) called a handset and a transceiver (2) called a base unit, and a telephone line (3) is connected to the base unit (2). , base unit (2)
The handset +11 and the handset +11 are connected by radio waves, and calls from subscribers are received by the handset +11 in the same way as a general telephone.

Therefore, the subscriber can freely move the HuntSent txt when making a call, and the telephone cord will not get tangled or get in the way.

The distance (service area) that the hand cent (1) can be separated from the base unit (2) is 300+
It is about w. In addition, the frequency of the radio waves used between the hand cent (1) and the base unit (2) is 49MIIz band for the upstream channel and 46M'H for the downstream channel.
Z band, and a 10 duplex channel is approved by the FCC (numbers are provisional).

Thus, this cordless telephone allows the telephone to be used conveniently.

Next, let's explain an example of this cordless telephone. In the following example, the communication channel between the handset (1) and the base unit (2) is assumed to be two channels, the A channel or the B channel.

Figure 3 shows an example of hand cent (11), (110)
is a transmitting circuit, and (120) is a receiving circuit. Also, Qin 4
The figure shows an example of the base unit (2), where (210) is a transmitting circuit and (220') is a receiving circuit.

When transmitting a call, the voice signal St from the transmitter (111) is transmitted to the hand center (1) by the low frequency amplifier (
112) to the FM modulation circuit (113), and the upstream A channel or B channel FM signal S
The S color of the FM signal is color-converted and sent to the antenna (10
0) and transmitted to the base unit (2).

Then, in the base unit (2), the signal (radio wave) Su from the hand cell l-(11) is connected to the antenna (20
0), and the received signal Su is passed through a bandpass filter (22
1) and the mixer circuit (
223) and a local oscillation circuit (224).
A local oscillation signal of a predetermined frequency is sent to the mixer circuit (223
), the signal Su is converted into an intermediate frequency signal, and this intermediate frequency signal is supplied to F through an intermediate frequency amplifier (225).
M demodulation times 1i! 8 (226) and the audio signal St
is demodulated, and this signal St is sent to the low frequency amplifier (227).
-Hybrid circuit (231) → Relay circuit (232)
is sent out to the telephone line (3) through the signal line.

In this case, the relay circuit (232) is connected to the base unit (
A relay that turns on and off the connection between the base unit (2) and the telephone line (3), and a relay that puts the line (3) on hold when temporarily suspending a call after the base unit (2) and the line (3) are connected. It has a hold relay etc. to keep it in place.

Also, when receiving a call, the voice signal Sr from the telephone line (3)
is supplied to the receiver (12B) of Handsent+11 through the same process as when transmitting a call. That is, the audio signal Sr from the line (3) is supplied to the FM modulation circuit (213) through the signal line from the relay line (232) to the hybrid circuit (231) to the low frequency amplifier (212').
The M signal S color is converted to the FM signal Sd of the downlink channel of the same channel, and this signal Sd is sent to the antenna (2
00) and transmitted to handset +11.

In the handsera l-+11, the signal Sd from the base unit (2) is received by the antenna (100), and the received signal Sd is filtered by a bandpass filter (121) whose passband is both downlink channels and a high-frequency filter. A local oscillation signal of a predetermined frequency is supplied to the mixer circuit (123) through the amplifier (122), and a local oscillation signal of a predetermined frequency is supplied from the local oscillation circuit (124) to the mixer circuit (123), so that the signal Sd becomes an intermediate frequency signal, This intermediate frequency signal passes through an intermediate frequency amplifier (125) to an FM demodulation circuit (1
26), the audio signal Sr is demodulated, and this signal Sr is sent to the receiver (128) through a low frequency amplifier (127).
).

Furthermore, in the Handscent+11, (140) indicates a control circuit that controls communication channels and the like.

This control circuit (140) is composed of a one-chip type microcomputer, and (141)
For example, is a CPU with 4-bit parallel processing.

(142) is the ROM in which the program is written, (
143) is a RAM for a work area, and (144) is an input/output port.

The microcomputer (140) has a dial key (15
1), l--k switch (152), ink cam key (
153), a channel switch (154) and a dip switch (155) are connected. In this case, the dial key (151) is a non-cock type button switch for inputting the telephone number of the other party, and the talk switch (152) is a changeover switch for selecting the operating mode of this handset (1). and the switch (
152) is the contact S, the pace unit (2) enters a standby state (standby mode) for receiving the signal Sd,
When the contact point is T, the handset (1) and pace unit (
2) is in communication state (talk mode) with
Normally, it is connected to standby contact S.

In addition, the ink cam key (153) is
) and pace unit (2) like an ink-pong.

The channel switch (154) is
This is a changeover switch for changing the communication channel between the and the pace unit (21) to the A channel or the B channel.Furthermore, the switch (155 is for giving an identification code ID, Output microcontroller (151) to (155) (14
0).

Furthermore, (161) defeats the MSK modulation circuit, which is
This signal is used to convert various control signals from a microcomputer (<140), e.g., signals generated when t x inches (151) to (154) are operated, into an MSK signal Sm in the audio band. 5I11 is supplied to an amplifier (112).

In addition, (162) is a reception detection circuit, which is connected to the i modulation circuit (126>) and determines the frequency component of the output of the demodulation circuit (126) depending on the presence or absence of the signal Sd from the Hayes unit (2). The presence or absence of the signal Sd is detected using the fact that the
40).

Sarani (163) is the MSK return return circuit, which is connected to the 11tM circuit (126), and the base Uniso 1-
(It demodulates control signals such as switch signals from the MSK signal Sm sent from 21A1;
The demodulated signal is supplied to a microcomputer (140).

Also, (mountain) indicates a call tone forming circuit, which is controlled by the microcomputer (140) and forms a ring tone signal when a call is received, and the ring tone signal is sent to the amplifier. (127).

Furthermore, the microcomputer (140) sends a signal CH specifying the channel to the modulation circuit (113) and the local oscillator circuit (12).
4), and a signal TX that controls whether or not to send out the FM signal Su is also supplied to the modulation circuit (113). Further, a muting signal M[ITE] is supplied from the microcomputer (1, 40) to the amplifier (127).

Further, in the pace unit (2), (240) indicates a control circuit. This control circuit (240) is constructed in the same manner as the control circuit (140) of the hand cent (1) and has the same functions, and is similar to the control circuit (141) to (144) of the control circuit (140). Corresponding circuits are given 200's codes instead of 100's, and their explanations are omitted.

In addition, switches (253) to (255) and circuits (26
1) to (264) are also handsets (1 switch (1)
53) to (155) and circuits (161) to (164), and the "ζ" for each signal is also the same, so a description of these will be omitted. However, the forming circuit (264) A tone encoded signal TE corresponding to the telephone number to be dialed is formed.

Furthermore, (265) indicates a bell sound signal detection circuit, which is connected to the telephone line (3) and detects a bell sound signal when a call is received, and the detection signal BL
is supplied to the microcomputer (240>).

Further, a control signal line is provided between the relay circuit (232) and the microcomputer (240).

When making a call to the other party from the Hunt Cent (1), the microcomputers (140) and (240) perform the following operations according to the programs in the ROMs (142) and (242).

That is, when the talk switch (152) is set to the talk contact T, the modulation circuit (
The sending of FM signal 9Su from the switch (113) is permitted, and the unmodulated signal Su is transmitted, and then the switch (155)
The identification code ID is taken out from the MSK signal SIl by the modulation circuit (161) and supplied to the amplifier (112). Therefore, the identification code ID is transmitted to the base unit (2) by the FM signal Su.

In the base unit (2), when the signal Su is received, the detection signal NSQ of the signal Su is obtained from the detection circuit (262), so the microcomputer (240) enters a state of checking the subsequent identification code ID. Then, the signal SII+7! is sent from the demodulation circuit (226). l< When the identification code ID is taken out from the detection circuit (263), it is checked whether this two-digit ID matches the identification code ID set in the switch (255), and if it is not correct, ( Other subscriber's handset+
1)), no further processing is performed and the standby state continues, but when it is correct, the transmission of the FM signal Sd from the modulation circuit (213) is permitted by the signal TX, and a communication channel is established. Signal MIJT
Muting of the amplifier (227>) is canceled by E.

Also, at this time, by transmitting the signal Sd, the signal N is sent from the detection circuit (162) in the reband set +11.
SQ is taken out, detected by the microcomputer (140), and the muting of the amplifier (127) is canceled by the signal MIITH.

Next, press the dial key (1) on the handset (11).
51) corresponding to the other party's telephone number, the microcomputer (140) forms the corresponding dial signal DS, and the modulation circuit (161') generates the MSK signal 5.
llI and similarly transmitted to the base unit (2).

In the Base Uniso H21, the demodulation circuit (2
A dial signal DS is extracted from 63), and this signal D
A circuit (26) is formed by a microcomputer (240) based on S.
4) is controlled to form a tone encode signal TE corresponding to the telephone number of the other party, and this signal TE is sent to the amplifier (2).
27), and further sent to the telephone line (3) through a hybrid circuit (231) and a relay circuit (232). Therefore, the other party is called by this signal TE, and if the other party answers the call, the conversation becomes possible from then on as described above.

On the other hand, when a call is received from the other party, the following operations are performed.

That is, normally the talk switch (152) is connected to the standby contact S, but when a call is received from the other party, the bell sound signal BL is extracted from the detection circuit (265) and supplied to the microcomputer (240). , Based on this, the modulation circuit (213) is allowed to send out the FM signal Sd by the signal TX, and then the identification code ID is converted to the signal 5L11 by the modulation circuit (261), and this signal S
+w is supplied to the amplifier (212), so that the identification code ID is transmitted to the handset +11 by means of the FM signal Sd.

In the handset ill, when the signal Sd is received, the signal NSQ is extracted from the detection circuit (162) and supplied to the microcomputer (140).
40) enters the identification code ID checking state, and 1M8
When the identification code ID is extracted from the four circuits (163), it is checked whether this code ID matches the identification code ID set in the switch (155), and if it is not correct, no further processing is performed and the system is in standby mode. However, when it is correct, the modulation circuit (
113) Sending of the FM signal Su is permitted and a communication channel is established, and the formation circuit (164)
A bell sound signal is formed at the amplifier (1
27) The signal is sent to the speaker (128) and a ringer sounds to notify you that there is an incoming call. Therefore, if the switch (152) is switched to the talk contact T, the bell sound from the speaker (128) will stop ringing and the amplifier (127) will stop ringing.

The muting of (227) is canceled by the signal MIITH, and a call becomes possible as described above.

By the way, the purpose of such a cordless telephone is to use the handset (1) in a place far away from the telephone line (3), as mentioned above. There are cases where the handset (1) is placed on a desk like a regular telephone, and the base unit (2) is placed on the desk and when not making a call, the handset (1) is placed on the base unit (2). ζ, handset 11 when making a call)
There are cases where the person picks up the call and makes the call.

Even in such a case, since there is no cord between the handset (1) and the base unit (2), the user is not bothered by the cord and can move freely during the call, which is convenient.

However, when using the cordless telephone by placing it on a desk, the talk switch (152) becomes a problem. That is, the talk switch (152) is usually set to standby contact S, and when making a call or receiving a call, the base unit (2)
Pick up the hand cent (1), then switch the talk switch (152) from the standby contact S to the talk contact T, and furthermore, if you want to make a call, you must operate the dial key (151). It was somewhat inconvenient.

Furthermore, when the call ends, the talk switch (152
) to the standby contact S, this is equivalent to not returning the handset to the main body of a normal telephone (off-hook), so the next time you receive a call from an outside line, You will not be able to receive these calls.

OBJECT OF THE INVENTION The present invention attempts to solve such problems.

SUMMARY OF THE INVENTION Therefore, in this invention, when the hand center (1) is connected to the pace unit (2), the hand center (1) is switched to standby mode regardless of the switching position of the talk switch (152). This is what I did.

FIG. 5 is an example of the embodiment, and this figure shows the rechargeable battery built in the hand separator (1) being charged. And Handscent (1) Nioite,
(171,) is the rechargeable battery, the output voltage of which is supplied to each part as its operating voltage.

In addition, (172) is its charging terminal, (173) is a charging detection circuit, and this detection circuit (173) is connected to the battery (171).
) is charged, the charging detection signal CHR becomes 1″
G is supplied to the microcomputer (140).

Furthermore, in the base unit (2), (271) is a power supply circuit having a power transformer, a rectifier circuit, etc., which is connected to a commercial AC power supply through a power plug (274) to form a DC voltage. It is supplied to each part as its operating voltage. Furthermore, (272) is a charging terminal, and when the handset ill is placed in a predetermined position of the pace unit (2) as shown in FIG. (272
), the battery (171) is charged.

Further, the ROM (142) of the microcomputer (140) has the routine α shown in the flowchart shown in FIG.
This routine is executed at predetermined intervals.

That is, this routine Ql starts from step (11), and then in step (12) the signal (JIR
G is checked. Then, when the handset (11) is not connected to the pace unit (2), the battery (171) is not being charged, so C) IRG
= "O", and the process proceeds from step (12) to step (13). Then, in this step (13), the switching position of the talk switch (152) is checked, and when the switch (152) is in the standby contact S, the process proceeds from step (13) to step (14).
In this step (14), the hand cent (
1) is put into standby mode, and this routine αω is ended at step (15).

Further, in step (13), the switch (152)
When is the talk contact T, the process proceeds from step (13) to step (16), in step (16) the hand cent (1) is placed in talk mode, and in step (17) this routine α0) is ended.

Therefore, if the handset +11 is not set in the base unit (2), step (13).

By (14) and (16), the hand sent fil is placed in a mode corresponding to the switching position of the talk switch (152).

On the other hand, when the hand centrifuge f1+ is connected to the pace unit (2), the battery (171) is charged, so CHRG-1'' is reached.Therefore, the process proceeds from step (12) to step (14). , this step (
Regardless of the switching position of the switch (152) in step (14), the handset (11) is placed in standby mode, and this routine call is ended in step (15).

That is, the handset (11 is the base unit (2)
When set to , the switching position of the switch (152) is ignored and the standby mode is forced.

Thus, according to the invention, when the hand cent (11) is placed on the base unit (2), the talk switch (152
), the handset (1) is placed in standby mode. Therefore, when making a call using a cordless telephone or receiving a call, simply lifting the handset 111 switches the handset (1) from standby mode to talk mode and allows you to make a call, and when the call ends, the handset 1-
(If you put down the handset (11), it will switch from talk mode to standby mode.

Therefore, during or after a call, the cordless telephone does not require any complicated switch operations, is easy to handle, and can be used in the same way as a normal telephone.

Also, after a call, the device automatically returns from talk mode to standby mode, so the next time you receive a call from outside, you can be sure to answer it.

Note that in the above description, the switch (152) and step (13) can also be omitted. Also, when the hand cent (1) is sent to the base unit (2),
The switch (152) may be mechanically actuated to switch to the standby contact S. Furthermore, circuits (161) to (163) and (261').

The operation (263) can also be realized by software. Furthermore, the telephone number of the other party can also be sent out by means of a dial pulse.

Effects of the Invention The cordless telephone does not require complicated switch operations, is easy to handle, and can be used in the same way as a normal telephone. Also, the next time you receive a call from outside, you can be sure to answer it.

[Brief explanation of the drawing]

FIGS. 1 to 4 and 6 are circuits for explaining this invention (
140) and (240) are microcomputers. Figure 1 Figure 2

Claims (1)

[Claims] A cordless telephone has a handset and a base unit connected to a telephone line, and communication between the handset and the base unit is performed by radio waves. A detecting means is provided for detecting whether or not the hand is being sent to the base unit, and the detection output of the detecting means controls the operating mode of the hand, so that when the handset is set in the base unit, the handset is placed in a standby mode. Cordless telephone.