JPS60194628A - Radio telephone set - Google Patents

Abstract

PURPOSE:To monitor what state slave equipment is kept all the time by providing master equipment with a monitoring receiving circuit which is scanned so that the reception frequency is made coincident with the transmission frequency of each slave equipment successively, and receiving an information signal transmitted from each slave equipment by the monitoring receiving circuit. CONSTITUTION:The frequency division ratio of the program divider of a PLL41 is set with the signal of a control circuit 40 at each slave equipment, the reception frequency of a receiving circuit 31 and the carrier signal transmitted by a transmitting circuit 37 are set to characteristic values of each slave equipment, and the carrier signal is modulated with an information signal generated according to the state of the slave equipment. The master equipment 1, on the other hand, generates a code signal varying in sequence by the 1st DATA part 19 to vary the frequency division ratio of the program divider of the PLL7, so the monitoring receiving circuit 4 is tuned to the frequency of carrier signals of respective slave equipments successively. A received carrier signal is detected by the 1st detecting circuit 9 and information signals P1 and P2 are detected by the 2nd and the 3rd detecting circuits 10 and 11 and applied to a control circuit 3. The control circuit 13 monitors the states of all slave equipments all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a radio telephone capable of constantly monitoring the status of a handset.

(b) Prior art Wireless telephones that made it possible to make phone calls by communicating with a base unit connected to a telephone line and the base unit wirelessly were, for example,
It is described in Publication No. 7649.

When such a radio telephone has a large number of handsets with different transmitting and receiving frequencies, when the base unit receives a calling signal, it is necessary to transfer the calling signal to one of the handsets. A call signal must be transferred to a handset that is in a standby state, and if a call signal is transferred to a handset that is reportedly inactive, a call will not be started for any length of time. Recently, there has been a desire to increase the functionality of wireless telephones, and some are designed to allow internal calls between one handset and another handset. In this case, if internal calls are made freely between handsets, confusion will occur, so it is desirable to obtain permission from the base unit before pressing K to allow internal calls. To do this, the base unit must constantly check whether the slave unit wishes to make an internal call.

(C) Purpose of the Invention The present invention provides a monitoring receiving circuit in the base unit that scans the reception frequency so that it sequentially matches the transmission frequency of each slave unit, and transmits the information signal transmitted from each slave unit to the The purpose is to be able to constantly monitor the state pressure of the handset by receiving it with a monitor receiving circuit.

B) Structure of the Invention The present invention provides a device having a base unit connected to a telephone line and a plurality of slave units each having a different transmitting and receiving frequency and capable of communicating wirelessly with the base unit. a monitoring receiving circuit that is scanned to be sequentially tuned to the transmission frequency of the monitor, a detection circuit that detects an information signal indicating the status of the handset demodulated by the monitoring receiving circuit, and an information signal detected by the detection circuit. A control circuit is provided to identify the
Each slave unit is provided with the information signal generation circuit, and the information signal generated from the information signal generation circuit of each slave unit is constantly monitored by the monitor receiving circuit of the base unit to identify the status of each slave unit. This invention relates to a characteristic wireless telephone.

(e) Examples The following describes the wireless telephone of the present invention according to the drawings.
Ω is a base unit connected to a telephone line (2)K, and has a control circuit (3), a monitor receiving circuit (4), a telephone receiving circuit (5), and a telephone transmitting circuit (6). The monitor receiving circuit (4) receives a code signal outputted from the control circuit (3) and changed periodically.

Based on the change in the division ratio of the program divider of PLL (7) by DI and D4, the receiving frequency is sequentially changed, and the information signal P from each child unit, which will be described later, is changed.
r, Pt are scanned and received, and the call receiving circuit (5) and the call transmitting circuit (6) generate code signals DI, Dt, and Ds-D4 specified by the control circuit (3), and the PLL (8 ) by changing the division ratio of the program divider, the transmitting/receiving frequency is set so that communication can be performed with the desired single slave device. The base unit (sword) further includes a carrier wave signal of each slave unit output from a monitor receiving circuit (4),
and first, second, and third detection circuits (9) (1 (IH), which detect information signals and apply them to the control circuit (3); a calling signal that oscillates a calling signal based on a control signal from the control circuit (3); Oscillator a: A code signal oscillator Q31 that oscillates various code signals, and a telephone reception circuit (5
), a hybrid transformer αa that connects the communication transmission circuit (6) and the telephone line (2), and a relay a4 that connects the hybrid transformer αa. In addition, the control circuit (3) is formed of a micro combinator, as shown in Figure 3.
a central processing unit H6) that processes each supplied signal and outputs a necessary signal; and the central processing unit α6) Vc.
ROM (17) for supplying signals according to defined procedures;
The code signals D+, Dt-Da, Da
The first and second DATAs Q9 (A), which are also central processing units (161), generate code signal control units (23, relay signal control units (2), and call signal control units (2), which generate various signals). The data signal D+
, Dt, Da, D4 are 0.0 as shown in FIG. 0
．． 0. 1 to 1. 0. The frequency is changed periodically up to 1.0, so that it becomes the - transmission/reception frequency of each slave unit.

Figure 2 is a block diagram of one of the multiple handsets, each with a different transmitting and receiving frequency, and the receiving circuit 0υ connected to the antenna.
, an amplifier circuit that amplifies the signal received by the receiving circuit 01), an amplifier circuit that amplifies the audio signal from the microphone (to), an audio signal amplified by the amplifier circuit, and a code. a transmission circuit G7) for transmitting the code signal from the signal generation circuit Cl51 from the antenna (to); a control circuit controlled by a signal from the keyboard (to) or the detection circuit OI for detecting the identification signal; Said transmitting circuit +
P to set the transmitting and receiving frequency of 37+ and receiving circuit 01)
LL (includes an AD). The code signal generation circuit (to) is controlled by a control signal from a control circuit (41), and generates information signals P, , , etc. as shown in FIG.
P, is generated. Here, the standby state means that the receiving circuit 0υ is in operation, but the transmitting circuit 0n is off, and the transmitting circuit (371 is not active) consumes power because the handset uses a battery to power the handset. When in use, the power is turned off, and an internal call means communication from one slave unit to a slave unit, and a busy transfer means that a communication from the base unit to the first slave unit is sent to the slave unit. It means that.

Next, the operation of the wireless telephone according to the present invention will be explained.

Each slave unit uses a PLL (4) control circuit (4 (I) signal).
The division ratio of the program divider of υ is set to a predetermined value, the reception frequency of the reception circuit ell) and the frequency of the carrier signal transmitted from the transmission circuit c171 are set to values determined for each slave device, and The carrier wave signal is modulated by the information signal generated according to the status of the handset in a transmitting circuit C37) and is transmitted.

On the other hand, in the case of the master unit (Kataru), as mentioned above, a code signal that changes sequentially is generated from the first DATA member and changes the division ratio of the program divider of the PLL (7), so the monitor receiving circuit (4) is connected to the first slave unit. The frequency of the carrier wave signal of the second, third, and so on handsets is sequentially tuned to the frequency of the carrier wave signal of the handset.Therefore, the transmitting circuit (37) of each handset is operated, and the antenna (from ), the carrier signal is transmitted sequentially to the base unit (
The signal is received from the sword's antenna (c) by the sword's receiving circuit (4). The received carrier wave signal is transmitted to a first detection circuit (9).
), and information signals pm, p, are detected by the second and third detection circuits (QIQI) and applied to the control circuit (3). In the control circuit (3), the carrier signal from the first detection circuit (9) and the second and third detection circuits (1
0) (Information signal P from ol, P is gate circuit C
21) and added to the central processing unit (2). Here, since the information signal takes a value of 0 or 1 even if there is no transmission from the slave device, the information signal and the carrier wave signal are AND gated in the gate circuit ff1l) to obtain correct data. RAM (l) of the control circuit (3)
A status table as shown in FIG. 6 is set in , and the information signals P, , P, sequentially supplied from the central processing unit Hf9 are constantly recorded and rewritten in the status table.

By setting the code signal generated from the first DATA section αη to rotate in sequence, the status of all slave units can be constantly monitored. Therefore, when a calling signal from the other party arrives via the telephone line (2), the calling signal detection circuit (a) applies the calling signal to the detection control circuit (3).
Check the handset that is set to 0,0 from the status table of M(l).If the first handset is set to 0,0, operate the keyboard (c) and change the code signal from 2DATAll (2I). ,, D,, D,.

D is set to O, O, 0, 1, and the transmission and reception frequencies of the communication receiving circuit (5) and the communication transmitting circuit (6) are made to match the transmission and reception frequency of the first slave device. Furthermore, the code signal control unit (221
The code signal oscillation circuit Q31 is operated with the signal from the above, and an identification signal for identifying a predetermined first handset is generated. The first slave unit does not react at all when the receiving circuit Gυ is not in use, but if it is in the standby state, it is received, and the detection circuit CIIK detects the identification signal from the received signals. detection control circuit (4G
Add to. When the identification signal is applied to the control circuit 0I, it detects that it matches the identification signal set in advance on the keyboard, and then temporarily operates the transmission circuit Gη.

At this time, since it is in a standby state, the information signals P,, P, generated from the code signal generation circuit (to) are 0. If OK is received, the carrier wave signal transmitted from the transmitting circuit Gη is modulated.

The carrier wave signal is received by the monitor receiving circuit (4), and the carrier wave signal and information signals P+ and Pt are detected by the first, second, and third detection circuits (9) (11 (111), and sent to the control circuit (3). The information signal Pr-PI is 0,0.
Therefore, it is identified by RAMaI that the first handset is in a standby state, and the calling signal control unit is controlled to operate the calling signal oscillation circuit a to oscillate the calling signal. The calling signal modulates a carrier wave signal in a communication transmitting circuit (6) and is transmitted from an antenna. The receiving circuit Oυ of the first slave device receives the carrier wave signal from the parent device (sword) again and demodulates the calling signal.The calling signal is sent to the amplifier circuit 04.
Since the signal is amplified by the speaker and the speaker (4) is driven, the owner of the first handset can know that there is an incoming call.Therefore, the owner of the first handset operates the changeover switch and makes a call from standby mode. When it is in the state, the transmitting circuit is activated, modulating the carrier signal with the information signals P, PI, and transmitting it to the master unit (Kataru).In the master unit (Kataru, the monitor receiving circuit (4) The information signals P,, P, are demodulated into the first, second,
The third detection circuit (9) is detected by Ql (lυ), is added to the control circuit (3), generates a relay control signal from the nuclear control circuit (3), excites the relay α, and closes the telephone line to make a call. The information signals PI and Pt are held until they stop.The voice signal of the owner of the first handset is received by the communication receiving circuit (5), and the demodulated voice signal is sent to the telephone through the hybrid transformer α. At the same time as being supplied to the line, the voice signal of the other party is sent to the communication transmitting circuit (6) through the hybrid transformer (4), which modulates a carrier signal and transmits it to the handset.

In this way, you can make phone calls from the slave unit to the other party through the base unit (υ).

In addition, as a result of receiving and monitoring signals from each handset in the monitor receiving circuit (4), when it is identified that the second handset is communicating internally with the third handset, the main phone (sword is the third handset) 3 The status of the handset is judged from the RAMQI status table, and if it is 0,0, the communication receiving circuit (5
) and the transmission/reception frequency of the communication transmitting circuit (6) to match the transmission/reception frequency of the third slave unit to check the status of the third slave unit. If it is confirmed that the third handset is in a standby state, a permission signal is transmitted from the base (1) to the second handset. Then, the transmission/reception frequency of the second handset is set to the transmission/reception frequency of the third handset, so that a call can be made between the second handset and the third handset.

If it is determined from the status table of RAM (1 frame) that the third handset is to be used for a call or the like, an internal call cannot be made because a permission signal is not sent from the base unit.

(F) Effects of the Invention As described above, the wireless telephone of the present invention is provided with a monitoring receiving circuit in the base unit so as to sequentially receive carrier wave signals from each slave unit, and generates signals according to the status of each slave unit. Since the information signal sent by the main unit is demodulated, detected by the detection circuit, and supplied to the control circuit to identify the status of the slave unit, the status of the slave unit can be constantly monitored by the base unit. Therefore, when a calling signal arrives, the calling signal can be transferred to the handset in standby mode, and requests generated from each handset, such as requests for internal calls with other handsets, can be quickly responded to. can. Furthermore, in the case of internal calls, the base unit monitors the status of all handsets and determines whether the call can be accepted or not, so the handsets may inadvertently generate radio waves that may cause interference. can be avoided.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the base unit of the wireless telephone of the present invention, and FIG.
FIG. 3 is a block diagram of the handset of the wireless telephone according to the present invention, FIG. 3 is a block diagram of the control circuit of the base device of FIG. 1,
FIG. 4 is a chart showing code signals used in the present invention, FIG. 5 is a chart showing information signals also used in the present invention,
FIG. 6 is a status table diagram of the RAM of the present invention. (1)...Base unit, (2)...Telephone line, (3)
...Control circuit, (4)...Monitor receiving circuit, (5)...Communication receiving circuit, (6)...
・Communication transmitting circuit, (7)...PLL, (81...
・PLL, (9)...first detection circuit, QO)...
Second detection circuit, (11)...Third detection circuit, 01)
...reception circuit, c37) ...transmission circuit, (3..detection circuit, (40..control circuit). Applicant: Sanyo Electric Co., Ltd. and one other representative Patent attorney: Yasuo Sano Figure 1 9.32Figure 30 ・21~4 [4 Figure U

Claims (1)

[Claims] (1) In a device that has a base unit connected to a telephone line and multiple handsets that each have different transmitting and receiving frequencies and can communicate wirelessly with the base unit, the base unit sequentially transmits the transmission frequency of each handset. A monitor receiving circuit that is scanned every time it is tuned), a detection circuit that detects an information signal indicating the status of the handset recovered by the monitor receiving circuit, and a detection circuit that identifies the information signal detected by the detection circuit. The information signal generation circuit is provided in each slave unit, and the information signal generated from the information signal generation circuit of each slave unit is constantly monitored by the monitor receiving circuit of the base unit. A wireless telephone characterized by state identification.