JPS60223341A - Transmitting and receiving device - Google Patents

Abstract

PURPOSE:To change the correspondence channel between a handset and a base unit even during talking by operating a channel key of the handset. CONSTITUTION:It is supposed that the correspondence between the handset 1 and the base unit is executed on a channel A. In this state, when a channel key 154 is depressed in the handset 1, it is detected and a code signal CHSW commanding the channel change is generated, and after an identification code ID and the signal CHSW are converted into an MSK signal Sm by a modulation circuit 161, they are transmitted sequentially to the base unit. On the other hand, a signal CH is changed after time waiting for a prescribed period is executed and the correspondence channel is changed to a new channel (channel B) in the base unit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to transceivers such as 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 system is being considered.

As shown in FIG.
i111 (21), the telephone line (3) is connected to the base unit (2), and the base unit (2) and the handset (11) are connected by radio waves, and the reception of the subscriber's telephone call is This is done for the hand cent (1) in the same way as for a general telephone.

Thus, the subscriber can move the handset (1) freely when making a call without the telephone cord becoming tangled or getting in the way, as is often the case.

The distance (space area) that the hand center (1) can be separated from the pace unit (2) is 300 mm.
It is about m. In addition, the frequency of radio waves used between the handset (11) and the pace unit (2) is 49Ml1z band for the upstream channel and 46MHz for the downstream channel.
A 10-duplex channel is approved by the FCC (numbers are provisional).

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

By the way, when making a call using such a cordless telephone, if another cordless telephone is used nearby on the same channel or a nearby channel, the call condition may deteriorate.

Therefore, in such a case, the channel currently being used must be changed. However, if you change the channel, the handset (11 and pace unit (2)
Since the handset 1) and the pace unit (2) are generally located far apart, changing channels is both inconvenient and troublesome. However, even if you change the channel, the call quality may not improve, and in that case, you will have to change the channel again.

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

Summary of the Invention Therefore, in this invention, "C" stands for hand cent (1).
When the channel key is operated, the communication channel between the handset (1) and the base unit 1-+21 can be changed even during a call.

Embodiment First, the basic configuration and operation of the signal system of the handset (1) and pace unit (2) will be explained. In this example, there are two communication channels, A channel and B channel, between the hand sent (1) and the pace unit (2).

Figure 3 shows an example of hand cent (1), (110)
is a transmitting circuit, and (120) is a receiving circuit. Also, the fourth
The figure shows an example of a pace unit (2), in which (210) is a transmitting circuit and (220) is a receiving circuit.

When transmitting a call, in the handset (1), the audio signal St from the transmitter (111) is transmitted to the low frequency amplifier (
112) to the FM modulation circuit (113), and the upstream A channel or B channel FM signal Su
This FM signal Su is sent to the antenna (10
0) and is transmitted to the pace unit (2).

In the pace unit (2), the signal (radio wave) from the hand center (1) is connected to the antenna (200
), and the received signal Su is passed through a bandpass filter (221
) and the mixer circuit (2) through the high frequency amplifier (222).
23), and a local oscillation signal of a predetermined frequency from the local oscillation circuit (224) is supplied to the mixer circuit (223).
The signal S is converted into an intermediate frequency signal, and this intermediate frequency signal is sent to the FM via an intermediate frequency amplifier (225).
The audio signal St is supplied to the demodulation circuit (226) and becomes Eft.
1liil, and this signal SL is sent to the low frequency amplifier (22
7) → Hybrid circuit (231) → Relay circuit (23
2) to the telephone line (3).

In this case, the relay circuit (232) connects the pace unit (
A relay that turns on and off the connection between the pace unit (2) and the telephone line (3), and a relay that puts the line (3) on hold when temporarily suspending a call after the pace unit (2) and the line (3) are connected. It has a bold relay etc.

Also, when receiving a call, the voice signal Sr from the telephone line (3)
is supplied to the receiver (12B) of the handset (1) through the same process as when transmitting a call. The audio signal Sr from the line (3) is supplied to the FM variable frequency circuit 213 through the signal line of the relay line (232) → hybrid circuit (231) → low frequency amplifier (212), and is converted to FM. F of the downlink channel of the same channel as the signal Su
The signal Sd is converted into an M signal Sd, and this signal Sd is passed through a high frequency power amplifier C214) and a bandpass filter (215) whose pass band is both downlink channels. antenna (200) and transmitted to handset +11.

In the hand cent (1), the signal Sd from the base unit (2) is received by the antenna (100'), and the received signal Sd is passed through a bandpass filter (121) whose passband is both downlink channels. and is supplied to the mixer circuit (123) through the high frequency amplifier (122), and a local oscillation signal of a predetermined frequency is supplied to the mixer circuit (123) from the local oscillation circuit (124), so that the signal Sd is converted into an intermediate frequency signal. , this intermediate frequency signal passes through the intermediate frequency amplifier (125) to the FM recovery circuit (125).
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 handset (1), (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 the 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 key (154) and a dip inch (155) are connected. In this case, the dial key (151) is a non-lock type button switch for inputting the other party's telephone number, and the talk switch (15
2) is a 3-position changeover switch for selecting the operation mode of this hand cell I-(11), and when the switch (152) is at contact O, the microcomputer (140)
When the power to all other circuits except for the 1 is turned off (off mode) and the contact S is on, the state is in standby mode (standby mode) to receive the signal Sd from the base unit (2), and when the contact is on the 1 and 1 It is in a communication state (talk mode) with the base unit node (2), and power is connected to the standby contact S.

In addition, the ink cam key (153) is a non-locking type psossui switch that can be used to call the base unit (2) when using the nose (1) and pace unit (2) like an intercom. Sochi.

The channel key (154) is a non-locking type button switch for changing the communication channel between the hand sent (11) and the base unit (2) to channel A or channel B.
55) is for giving an identification code ID,
The outputs of these keys and switches (151) to (155) are supplied to the microcomputer (140).

Furthermore, (161) shows an MSK modulation circuit, which is
When the identification code ID, dial signal R, S, etc. are supplied from the microcomputer (140), these signals are converted from binary signals to audio band MSK signals 5rrl, and the signal Sm is sent to the amplifier (112). Supplied.

In addition, (162) is connected to the demodulation circuit (126), and the frequency component of the output of the demodulation circuit (126) is determined depending on the presence or absence of the signal Sd from the base unit node 2). The presence or absence of the signal '4Sd is detected by using different characteristics, and the detection signal NSQ is sent to the microcomputer (
140).

Furthermore, (163) shows an MSK demodulation circuit, which is connected to the demodulation circuit (126) and base uni node (2).
This demodulates the identification code ID etc. from the MSK signal Sm sent from the microcomputer (1
40).

Further, (164) indicates a call tone forming circuit, which is controlled by the microcomputer (140) and forms a ring tone signal (ring tone signal '4) when a call is received. The signal is fed to an 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 (140) to the amplifier (127).

Further, in the pace unit (2), (240) indicates a control circuit. This control circuit (240) is configured similarly to the control circuit (140) of the hand cent (1) and has the same functions, and corresponds to circuits (141) to (144) of the control circuit (140). 100
Instead of the code for the number, a code for the ``ζ200th generation'' will be added, and the explanation will be omitted.

Also, switches (253), (255) and circuit (2
61) to (264) are also hand separator l-(11 switches (153), (155) and circuits <161) to (1
64) and the same applies to each signal, so a description thereof will also be omitted. However, the formation circuit (26
Step 4) forms a tone encoded signal TE corresponding to the telephone number used when making a call to the other party.

Furthermore, (265) is a bell sound signal detection circuit, which detects the bell sound signal when a call is received by connecting to a telephone line (group), and the detection signal BL is detected by a microcomputer (24θ ).

In addition, the line (3) is connected to a general telephone set (4) through a relay circuit (232), and the relay circuit (23
A control signal line is provided between 2) and the microcomputer (240). In addition, (26G) is the buzzer of the summoning river, (
255) is the lock type switch.

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

In other words, the 1-talk switch (152) is connected to the talk contact T.
, the sending of the FM signal Su from the modulation circuit (113) is permitted by the signal TX based on the output,
An unchanging signal Su is transmitted, and then the ζ switch (15
The job classification code II) is taken out from 5), and this code ID is converted into an MSK signal Sm by a modulation circuit (161) and supplied to an amplifier (112). Therefore, the identification code ID is transmitted to the pace unit (2) by the FM signal Su.

In the pace unit (2), when the signal Su is received, the detection signal NSC 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 Snl is taken out from the demodulation circuit (226) and the detection circuit (
When the identification code ID is retrieved from the switch (263), it is checked whether this code ID matches the identification code ID set in the switch (255). ), no further processing will be performed and the standby state will continue, but if it is not possible to stop, the fa TX will change 1i11d.
Sending of the FM signal Sd from the circuit (213) is permitted and a communication channel is established, and the signal MIT
I! This releases the muting of the amplifier (227).

Also, at this time, by transmitting the signal Sd, a signal N is sent from the detection circuit (162) in the hand center (1).
The SC is taken out, detected by the microcomputer (140), and the muting of the amplifier (127) is canceled by the signal MUTH.

Next, press the dial key (1) at hand seso) +1).
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 Sm.
and similarly transmitted to the pace unit (2).

Then, in the pace unit (2), the dialing signal DS is taken out from the fjL tone circuit (263), and based on this signal DS, the forming circuit (264) is controlled by the microcomputer (240) to dial the telephone number of the other party. A tone encode signal TE corresponding to the
31) and the telephone line (3) through the 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.

Zunawachi, ill! The talk inch (152) of the seat is connected to the standby contact S, but when a call is received from the other party, a ring sound signal BL is extracted from the detection circuit m (265) and supplied to the microcomputer (240). , Based on this, the signal TX allows the variable #IM circuit (213) to send out the FM signal Sd, and then the identification code ID is converted into the signal Sm by the modulation circuit (261).
This signal 5rrl is supplied to the amplifier (212), and therefore the identification code ID is transmitted to the hand sent (1) by the FM signal Sd.

In the Handsent+11, when the signal Sd is received, the signal NSC is taken out from the detection circuit (162) and supplied to the microcomputer (140).
40) enters the identification code ID checking state and demodulates -
When the identification code ID is extracted from 1 Raku (163),
The match between this code ID and the identification code ID set in the switch (155) is checked, and if it is not correct, no further processing is performed and the standby state continues, but if the code ID is not correct, the modulation circuit is activated by the signal TX. (1
The transmission of the FM signal Su from 13) is permitted, and the ζ communication channel is established.
In step 4), a ring tone signal 115 is generated, and this signal is supplied to a speaker (128) through an amplifier (127) to generate a ring tone to notify 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 muting of the amplifiers (127) and (227) will be canceled by the signal MUTE, as described above. You will be able to make calls like this.

The above is the basic configuration and operation of the cordless telephone.

Furthermore, in this invention, in order to be able to change the communication channel even during a call, the ROM (142),
(242) includes the routine (180) that is attached to Figure 2.
, (280) are added. And the channel key (
154), the CPU (241) is pressed.

(241) Lucia (180), (280)
are executed and the communication channel is changed.

That is, now the handset (King and Pace unit (
2) is conducted on the A channel. In this state, when the channel key (154) is pressed on the handset (1), this is detected in step (181), and then in step (1B2
) code signal CII instructing channel change.
SW is formed, identification code ID and its signal Cll
5W is converted into an MSK signal Sm by a modulation circuit (161) and then sequentially transmitted to the pace unit (2).

Note that the transmission of these signals rD and MSI is performed using the old channel, that is, the A channel.

Then, in the pace unit (2), the step (
1B2) transmitted by the signal ID, Cll5
W is received by step (281), and the 1M tone circuit (
263), the signals I D and CH3W are sequentially extracted. Then, in step (282), the signal ID, Cll5-, received in ζ step (281) is checked, and if it is incorrect (such as when it is another cordless telephone or other code signal), step (289) is performed.
Therefore, the subsequent processing is stopped, and if it is correct, the processing proceeds to step (283), and in this step (283), the identification code ID and the answer passok signal AB are transmitted to the hand sent (1). Note that this transmission also uses the signal ID
, AB are converted into MSK signals Sm and then performed on the old channel (A channel).

Therefore, in the handset fl), the signals ID and AB are taken out from the if adjustment circuit (163), and in step (183), the signals ID and A
B is checked and if not correct, step (188)
The subsequent processing is stopped, and if it is correct, the processing moves to step (184). In this step (184), the signal CH changes and the communication channel is changed to a new channel, which is naturally the B channel, and then step (18
In 5), the identification code TD and confirmation code CF are transmitted.

Note that transmission is performed on a new channel (B channel) after the signals ID and CF are converted into the MSK signal Sm.

On the other hand, in pace unit (2), step (2)
83), after waiting for a predetermined period of time in step (284), proceeding to step (285),
In this step (285), the communication channel is changed to a new channel (B channel). In this case, the channel change in this step (285) is performed simultaneously with the channel change in step (184), and the channel change in step (285) is performed simultaneously with the channel change in step (184).
) is used to adjust the time for changing the channel.

When this channel change is completed, in the pace unit (2), the signal ID and CF transmitted in step (185) are obtained from the demodulation circuit (263), but these signal ID and CF are transmitted in step (286). If not, the identification code ID and answer signal AB are transmitted using the new channel (B channel) in step (287), and then this routine (280) is ended in step (288). If it is completely lost, the signal CH changes in step (291>) and the communication channel changes to the old channel (A channel).
is returned to, and in step (288) this routine (
288) ends.

Also, in hand cent fil, step (28
The signals Ill, AB sent by step (1)
86), and if correct, step (18)
7) ends this routine (180), and if it is not correct, the signal CH changes in step (189) at the same time as step (291), the communication channel is returned to the old channel (A channel), and step (189)
) ends this routine (180).

As described above, according to the routines (180) and (280), when the channel key (154) is pressed, the communication channel is changed.

Therefore, if the call condition worsens due to the influence of another cordless telephone during a call, if the channel key <154
) can change the communication channel and therefore make a good call.

Note that steps (182), (281), (283
).

The transmission and reception of the code signal in (183) is performed using the old channel, and at this time, although the old channel is in poor condition, there is no problem because the code signal has better noise resistance than the audio signal.

In this way, according to the present invention, even if the call condition deteriorates due to the influence of other cordless telephones during a call, the communication channel can be changed simply by pressing the channel key (154). You can make calls using . Moreover, since the communication channel is changed each time the channel key (154) is pressed, a good channel can be selected easily.

Furthermore, there is no need to go to the pace unit (2) and change the communication channel, and you can change the communication channel while in actual use, allowing you to select a very good channel. Since this is confirmed by handshaking in the routines (180) and (280), it is certain that the communication channel has been changed, and only one of the handset (1) and pace unit 2) has been changed and the other has not. If the information is not changed, the call will not be interrupted.

Note that, for example, when using the handset (1) and pace unit (2) as an intercom using the handset of the telephone (4), the Base Uniso I (2)
If you also provide a channel key (154) for the handset +11 and pace unit (2), and prepare routines (280) and (180) for the handset +11 and pace unit (2), respectively,
The communication channel can also be changed from the pace unit (2) side.

Also, circuits (161) to (163), (261') to
The operation (263) can also be realized by software.Furthermore, it is also possible to send out a dial pulse to the other party's telephone.

In addition to cordless telephones, transceivers,
The present invention can also be applied to a carrier wave type ink-pump using a commercial AC power line.

Effects of the Invention During a call, when the call condition deteriorates, the communication channel can be changed simply by operating the keys on the hand center, and there is no need to go to the Heath unit. Furthermore, since the communication channel can be selected under actual usage conditions, a good channel can be selected reliably. Furthermore, since the change of the communication channel is confirmed by handshake, the channel of only one of the handset and pace unit will not be changed, and communication will not be disabled.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining this invention, and FIGS. 3 and 4 are system diagrams of an example of this invention. (11 is the handset, (2) is the pace unit, (1 is the
10) (210) is a transmitting circuit, (120), (220
) is a receiving circuit, and (140) and (240) are microcomputers. Figure 1 Figure 2

Claims (1)

[Claims] The first and second transceivers are combined, and communication is performed between the first and second transceivers using one of a plurality of communication channels, and at least the first transceiver The machine is equipped with a channel key, and when this channel key is operated, the first code signal indicating that this channel key has been operated is transmitted.
When the code signal is received by the second transceiver, an answerback signal indicating reception is transmitted from the second transceiver to the first transceiver. the communication channel of the second transceiver is changed to another channel, and when the answerback signal is received by the first transceiver, the communication channel of the first transceiver is A transmitter/receiver device that allows the above to be changed to another channel.