JPH0396134A - Radio telephone set - Google Patents

Abstract

PURPOSE:To expand applications of a radio telephone set by providing a function of a portable telephone set to a handset of a cordless telephone set. CONSTITUTION:Reception circuits 10, 20, 40 and transmission circuits 30, 50 in a handset, a reception circuit and a transmission circuit in a portable telephone set, a receiver 72, a transmitter 73 and a dial key are provided to the radio telephone set. Then the receiver 72, the transmitter 73 and the dial key 18 are connected selectively to the reception circuits 10, 20, 40 and the transmission circuits 30, 50 in the handset of a cordless telephone set and the reception circuit and the transmitter circuit in the portable telephone set. Thus, one set of the telephone set acts like the handset of the cordless telephone set or the portable telephone set. Thus, a telephone call is made freely indoor or outdoor and it is not required to prepare the portable telephone set and the handset of the cordless telephone set and to use them.

Description

[Detailed description of the invention] A. Industrial application field TECHNICAL FIELD This invention relates to wireless telephones.

B. Summary of the Invention This invention provides wireless telephones that provide a cordless telephone handset with the functionality of a mobile telephone.
This is an expanded version of its use as a wireless telephone.

Detailed description of the invention The explanation will be given in the following order.

A. Field of Industrial Application C. Conventional Technology A cordless telephone consists of a transceiver called a base unit and a transceiver called a handset, and the base unit is connected to a general subscriber telephone line.

When making a call, a communication channel using radio waves is opened between the base unit and the handset, and the subscriber makes a call from the handset.

In this case, the frequencies used are a 250 MHz band for up channels and a 380 MHz band for down channels, the number of channels is 89 (including a control channel), and the transmitting power of the handset is 10 mW.

D. Problem to be Solved by the Invention However, in this cordless telephone, since the transmitting output of the handset and base unit is small, the distance at which the handset can be separated from the base unit, that is, the service area, is about 100 meters, The range or location where it can be used is limited.

This invention attempts to solve these problems.

E. Means for Solving the Problems Now, considering car telephones, there is a so-called small zone cellular system. In the case of this method, it is possible to use a mobile phone with a low transmission output.

That is, in this method, the frequency used is
The upstream channel is the 930Milz band, the downstream channel is the 880MHz band, and the number of channels is 1200.
channel (including the control channel), the transmission power of the mobile phone is 600n+W.

This invention focuses on such points. That is, the present invention includes a receiving circuit and a transmitting circuit in a handset of a cordless telephone, a receiving circuit and a transmitting circuit in a mobile phone, a receiver, a transmitter, and a dial key, and the receiver and the transmitter have a receiver and a transmitter. A wireless telephone configured to selectively connect a speaker and the dial key to a receiving circuit and a transmitting circuit in a handset of the cordless telephone and a receiving circuit and a transmitting circuit in the mobile telephone to make a call. It is something to do.

F Function: Calls are made and received as a cordless telephone handset or as a mobile phone.

G. Embodiment In the example shown in FIG. 1, the reception system of a mobile phone performs diversity reception.

That is, in the same figure, (10). (20) are the first and second receiving circuits of the mobile phone, (30) is its transmitting circuit, (40) is the receiving circuit of the cordless phone, (5o)
Reference numeral denotes its transmitting circuit, (61) a PLL for controlling local oscillation signals for channel (transmission/reception frequency) setting, (62) an encoder for controlling various control signals, and (64) a similar decoder.

In this case, part of the receiving circuit ia (10) is shared with the receiving circuit (40). Furthermore, the transmitter circuit (3
In 0), some circuits are also used as the transmitting circuit (50).Then, the receiving circuit (10), (20),
(40) is always in reception mode.

Also, (72) is a receiver, (73) is a transmitter, (81)
is a dial key, (82) is various operation keys (switches), (83) is a ringer, (84) is an LQD that displays various information, (91). (92) is a microcomputer.

In this case, the microcomputer (91) mainly performs processing related to channel control, such as access to the base unit of the cordless telephone and access to the base station of the mobile phone, and the microcomputer (92) is responsible for processing the means (81) to (84
) is mainly responsible for processing related to the interface with the user.

Furthermore, the microcomputer (91) is provided with a calling routine (100) as shown in FIG. 2, for example, which is executed by the microcomputer (91) (and (92)) when making a call.

During a call, the call is performed by the following signal processing. First, let's explain about calls in mobile phone mode.

That is, in this case, the microcomputer (9l) switches the switch circuits (14) . (32) is connected in the state shown in the figure, and is controlled by a microcomputer (91), and a local oscillation signal of a predetermined frequency is output from PLL (61).

Then, the audio signal from the transmitter (73) is supplied to the FM modulation circuit (31) through the transmitter amplifier (74) to become an FM signal Su, and this signal Su is transmitted to the switch circuit (
32) to the mixer circuit (33>), and the local signal from PLL (61) is also supplied to the mixer circuit (33). This signal Pu is supplied to the antenna (21) through the output amplifier (34) of class C operation and the transmitting/receiving circuit (22), and is transmitted to the base station of the mobile phone.

Then, at the base station, the original voice signal is demodulated from the received signal Pu, and this signal is sent to the other party's telephone through a predetermined line.

In addition, the voice signal from the other party's phone is transmitted to the base station.
FM signal Pd of downlink communication channel in mobile phone
This signal Pd is transmitted.

Then, this signal Pd is received by the antenna (11), and is supplied to the mixer circuit (13) through the high frequency amplifier (12) having bandpass characteristics.
The local oscillator signal is supplied from L L (61) to the mixer circuit (13), and the signal Pd is frequency-converted into a first intermediate frequency signal. Then, this intermediate frequency signal is transmitted to the switch circuit (1
4), and is further supplied to the frequency conversion circuit (16) through the first intermediate frequency amplifier (15), where the frequency is converted into a second intermediate frequency signal, and this intermediate frequency signal is supplied through the second intermediate frequency amplifier (17). The signal is supplied to the FM demodulation circuit (18), where the other party's audio signal is demodulated, and this signal is supplied to the switch circuit (19).

In addition, the FM signal Pd from the base station is transmitted from the antenna (2l
), and this signal Pd is also received by the shared circuit (2
2) to the mixer circuit (23), and the local oscillator signal is supplied from the PLL (61) to the mixer circuit (23).
3), and the signal Pd is frequency-converted into a first intermediate frequency signal. This intermediate frequency signal is then supplied to the frequency conversion circuit (-26) through the first intermediate frequency amplifier (25) and frequency-converted into a second intermediate frequency signal. 27) Through F
The M demodulation circuit (28) demodulates the other party's audio signal, and this signal is supplied to the switch circuit (19).

Furthermore, from the demodulation circuits (1B) and (28), DC level signals corresponding to the levels of those intermediate frequency signals, that is, the reception levels of the signals Pd and Pd at the antennas (11) and (21) are detected. The signals S, , S2 are taken out, and the signals S+, St are supplied to the comparator circuit (29) for voltage comparison, and the comparison output is sent to the switch circuit (29).
19) as its control signal, and the switch circuit (
19), the demodulation circuit (18). Among the audio signals from (19), the signals S,,S. The audio signal with the higher level is extracted. This extracted audio signal is then transferred to the receiving amplifier (
71) to the handset (72).

As described above, a call is made in the mobile phone mode.

On the other hand, a call in the cordless telephone mode is performed by the following signal processing.

That is, in this case, the microcomputer (9l) connects the switch circuits (14) and (32) to the state opposite to that shown in the figure, and the switch circuit (19) to the state shown in the figure. ) is controlled by P L L
(61) outputs a local oscillation signal of a predetermined frequency.

Then, the audio signal from the transmitter (73) is supplied to the FM modulation circuit (3l) through the transmitting amplifier (74) to become an FM signal Su, and this signal Su is sent to the switch circuit (
32) to the mixer circuit (53), and the local signal from PLL (61) is also supplied to the mixer circuit (53). This signal Cu is frequency-converted to a class-C operation output amplifier (54
) to the antenna (5l) and transmitted to the base unit of the cordless telephone (not shown).

Then, in the base unit, the received signal Cu
The original voice signal is demodulated, and this signal is sent over the telephone line to the other party's phone.

Further, the audio signal from the other party's telephone is converted into an FM signal Cd of the downlink communication channel of the cordless telephone in the pace unit, and this signal Cd is transmitted.

Then, this signal Cd is received by the antenna (4l), is supplied to the mixer circuit (43) through the high frequency amplifier (42) having bandpass characteristics, and is also supplied to the mixer circuit (43).
A local oscillation signal is supplied from L L (61) to the ξ xer circuit (43), and the signal Cd is frequency-converted into a first intermediate frequency signal. Then, this intermediate frequency signal is transmitted to the switch circuit (1
4) to the intermediate frequency amplifier (15), and thereafter, the other party's audio signal is extracted from the demodulation circuit (1) in the same manner as in the mobile phone mode, and this signal is sent to the switch circuit (19) and the amplifier (71). ) to the handset (72>).

As described above, a call is made in the cordless telephone mode.

Further, when making a call, the microcomputer (9l) executes a calling routine (100) to make the call.

In other words, when the mode key of the operation keys (82) is changed from standby mode to call mode, this changes to the microcomputer (92).
), and based on the detection output, the microcomputer (92) supplies a command requesting the microcomputer (91) to make a call.

Then, the microcomputer (91) executes the calling routine (1).
00) starts, and in step (101), the encoder (62) is set to ff by the microcomputer (91).
dH is transmitted to the mobile phone to form a control signal for a call request, and this control signal is supplied to the modulation circuit (31), and the microcomputer (91) changes the modulation circuit (31) to the operating state (transmission permission). ), and the control signal from the encoder (62) is an FM signal Su.

Then, this signal Su is supplied to the straw mixer circuit (33) through the switch circuit (32), and the PL L
A local oscillation signal of a predetermined frequency is extracted from (61) and supplied to the ξ mixer circuit (33), the signal Su is frequency-converted to the FM signal Pa of the upstream control channel of the mobile phone, and this signal Pu is Circuit (34). (2
2) is supplied to the antenna (21) and transmitted to the mobile phone base station.

Then, when the response FM signal Pd is transmitted from the base station through the downlink control channel of the mobile phone, this signal Pd is received by the antenna (1l), and from then on, as described above, the demodulation circuit (l8 ), a detection signal S, of the reception level of the signal Pd is extracted, and this signal SI is sent to the A/D converter. The receiving level of the signal Pd indicated by the signal S, is supplied to the microcomputer (91) after being converted into a digital signal.
). Note that when this storage is performed, the microcomputer (91) puts the modulation circuit (31) in a dormant state (transmission is prohibited).

Next, the processing of the microcomputer (91) is at step (102).
In this step (102), the microcomputer (
91) controls the encoder (62) to form a control signal for a call request in the cordless telephone, and this control signal is supplied to the modulation circuit (31), and the microcomputer (9l) controls the modulation circuit (3l). The operating state (transmission permission) is set, and the control signal from the encoder (62) is FM. It is assumed to be a signal Su.

Then, this signal Su is supplied to the straw mixer circuit (53) through the switch circuit (32), and the PL L
A local oscillator signal of a predetermined frequency is extracted from (61) and supplied to the mixer circuit (53), and the signal Su is the FM signal Cu of the upstream control channel of the cordless telephone.
This signal Cu is supplied to the antenna (51) through an amplifier (54) and transmitted to the base unit of the cordless telephone.

Then, when a response FM signal Cd is transmitted from the base unit through the downlink control channel of the cordless telephone, this signal Cd is received by the antenna (4l), and from then on, as described above, the demodulation circuit (18
), a detection signal S, of the reception level of the signal Cd is taken out, and this signal S1 is supplied to the microcomputer (9l) through the A/D converter (63), and the reception level of the signal Cd indicated by the signal S1 is detected by the microcomputer. (9l).

Note that when this storage is performed, the modulation circuit (31) is placed in a dormant state (transmission is prohibited) by the microcomputer (9l).

Next, the microcomputer (9l) processes step (103)
In this step (103), step (
The reception level of the signal Pd stored in step (101) and the reception level of the signal Cd stored in step (102) are compared, and if the reception level of the signal Pd is higher than the reception level of the signal Cd, the process proceeds to step (103). ) to step (111).

Then, in this step (111), step (
The demodulation circuit (18) extracts a response signal from the base station to the call request, and this signal is sent to the microcomputer (91) via the decoder (64).
). Thereafter, processing according to a predetermined protocol is performed to connect the base station and the receiving circuit (TO).
．． (20) and the transmission circuit (30), a communication channel is opened.

Therefore, when you input the other party's phone number from the dial key (8l), the output of the dial key is supplied from the microcomputer (92) to the encoder (62) to form a control signal indicating the phone number, and this signal is sent to the mobile phone. The information is sent to the base station through the uplink communication channel at the base station, where it is decoded into the telephone number of the other party, and then the process of calling the other party's telephone is performed.

Then, if the other party answers the phone, the conversation will proceed as described above. Note that during the call, the microcomputer (91) waits for a request for the next process in step (112).

When the call ends, when the mode key of the operation keys (82) is changed from the call mode to the standby mode, this is detected by the microcomputer (92), and based on the detection output, the microcomputer (92) is transferred to the microcomputer (91). ) is supplied with a command indicating the end of the conversation.

Then, in the microcomputer (91), this command is detected in step (112), and the process proceeds to step (112).
The process proceeds from step (112) to step (113), and in this step (113), the encoder (62) is controlled by the microcomputer (91) to form a control signal for ending the call in the mobile phone, and this control signal is sent to the modulation circuit (31). ), a call termination control signal is transmitted to the base station, the communication channel is closed according to a predetermined protocol, and the call is terminated.

At this time, the microcomputer (91) also controls the modulation circuit (3).
1) is set as a dormant Di (prohibition of transmission), and the microcomputer (92) outputs the amplifier (71). (74) is also placed in a dormant state.

In this way, when the call termination process is performed, the process of the microcomputer (91) is executed by the routine (100) in step (114).
and the phone goes into standby mode.

On the other hand, the reception level of signal Pd is higher than the reception level of signal Cd. If the value is also small, the process proceeds from step (103) to step (121).

Then, in steps (121) and (122), step (111). The same process as (112) is performed, a communication channel is opened with the base unit of the cordless telephone, and furthermore, the other party is called by operating the dial key (81) and a communication state is established.

Then, when the call ends, if the mode key of the operation keys (82) is changed from the call mode to the standby mode, step (123). (124), steps (113) (114) (11
The call termination process is performed in the same manner as in 4) and the device enters a standby state.

Furthermore, when a call arrives through the base station, the receiving circuit (IO
) extracts the control signal for the call request from the demodulation circuit (I8), and supplies this signal to the microcomputer (9l) through the decoder (64).

Then, the microcomputer (91) allows the transmission circuit (3o) to transmit, transmits a control signal in response to the incoming call request, and thereafter executes a predetermined protocol with the base station to open a communication channel. At the same time, the microcontroller (
A command for an incoming call is supplied from the microcomputer (91) to the microcomputer (92), and the microcomputer (92) drives the ringer (83) to notify the incoming call.Then, the mode key of the operation keys (82) is set to standby mode. When the call mode is set from , this is detected by the microcomputer (92), and based on the detection output, the microcomputer (92) to the microcomputer (9l)
A command requesting a call is supplied to the amplifier (71).
．． (74) is brought into operation, and the ringer (
83) is turned off. After a while, you can make a call in response to an incoming call through the base station.

Furthermore, when a call arrives through the base unit of the cordless telephone, the reception circuit (4o) extracts the control signal for the call request from the demodulation circuit (l8), and thereafter processes the same as when the call arrives through the base station. A call channel is opened between the base unit and the base unit, and a call is made through this call channel.

As described above, according to this invention, one telephone can operate as a cordless telephone handset or a mobile phone, so as long as you have this telephone, you can freely make calls indoors or outdoors. There is no need to prepare two devices, a mobile phone and a cordless phone handset, and use them separately.

For example, there is no need to change the mobile phone and handset depending on the location, whether you use it in the office or take it with you on the go.

Furthermore, when making a call, the reception level of the signal Pd from the base station and the reception level of the signal Cd from the base unit are compared and the communication channel with the higher reception level is selected, so the system is always in a state of The call can be made using a good communication channel.

Also, when making a call indoors, the reception level of the signal Cd from the base unit is high, so it operates as a cordless telephone handset, and therefore,
Since the transmission output is low, power consumption can be reduced and the battery life of the power source can be extended. Additionally, running costs can be reduced.

Furthermore, the receiving circuit (10) and the receiving circuit (40) are
The intermediate frequency amplifier (15) and subsequent parts are shared, and the transmitting circuit (
30) and the transmitter circuit (50) share the parts up to the modulation circuit (31), so the overall size and weight can be reduced, and costs can be reduced.

In the above, when making a call, the call processing is performed as a cordless telephone handset, and when the reception level of the signal Cd is lower than a preset level, the call is made as a mobile phone. You can.

Further, the protocols at the time of call origination, call reception, and call termination can also be made to correspond to the base station or the Ichiku unit.

H. Effects of the Invention According to this invention, one telephone can operate as a cordless telephone handset or a mobile phone, so as long as you have this telephone, you can freely make calls whether indoors or outdoors. This eliminates the need to prepare two devices, a mobile phone and a cordless phone handset, and use them separately.

For example, there is no need to change the mobile phone and handset depending on the location, whether you use it in the office or take it with you on the go.

Furthermore, when making a call, the reception level of the signal Pd from the base station and the reception level of the signal Cd from the base unit are compared and the communication channel with the higher reception level is selected, so the system is always in a state of The call can be made using a good communication channel.

Also, when making a call indoors, the reception level of the signal Cd from the base unit is high, so it operates as a cordless telephone handset, and therefore,
Since the transmission output is low, power consumption can be reduced and the battery life of the power source can be extended. Additionally, running costs can be reduced.

Furthermore, the receiving circuit (10) and the receiving circuit (40) are
The intermediate frequency amplifier (15) and subsequent parts are shared, and the transmitting circuit (
30) and the transmitter circuit (50) share the parts up to the modulation circuit (31), so the overall size and weight can be reduced, and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an example of the present invention, and FIG. 2 is a flowchart of its operation. (10). (20) and (40) are receiving circuits, (
30), (50) is a transmitting circuit, (72) is a receiver,
(73) is the transmitter, (8l) is the dial key (91)
, (92) is a microcomputer, and (100) is a calling routine.

Claims (1)

[Scope of Claims] A receiving circuit and a transmitting circuit in a handset of a cordless telephone, a receiving circuit and a transmitting circuit in a mobile phone, a receiver, a transmitter, and a dial key, the receiver and the transmitter. device and the above dial key,
A radio telephone configured to selectively connect to a receiving circuit and a transmitting circuit in the handset of the cordless telephone and a receiving circuit and a transmitting circuit in the mobile telephone to make a telephone call.