JP3271927B2 - Radio with modem - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio with a modem, and more particularly to a personal transceiver, a simple business radio, and the like for transferring digital data to a modem.
The present invention relates to a wireless device with a modem, which can be modulated into an analog signal of a predetermined format such as SK or QPSK so that data can be transmitted to the outside.

[0002]

2. Description of the Related Art In a personal radio, for example, it is possible to easily make a call simply by setting the same group number as that of a partner station using a numeric keypad. Is unnecessary. In addition, the calling code (ATIS number = Automatic Transmitter Id
This is a convenient system that does not need to name the call sign because the entification system number is automatically fired. FIG. 5 shows a configuration of a conventional personal transceiver used for personal radio. 1 is a numeric keypad,
2 is PTT. SW (press talk switch), 3 is an antenna for both transmission and reception, 4 is an antenna changeover switch, 5 is the antenna caught by the antenna 3, amplifies the radio wave of the desired channel in the personal wireless band, converts the frequency to an intermediate frequency signal, A receiving circuit for performing FM demodulation, 6 is a power amplifier, and 7 is a speaker.

[0003] 10 is a microphone, 11 is a microphone amplifier, 12
Muting circuit 13 is a modem, and operates based on the operation clock CK ₀ inputted from the oscillator 14, the time of data reception inputs the analog MSK modulation signal from the receiving circuit 5, and the MSK demodulation, the read bit clock signal
The received data RX-D is transferred to the controller one bit at a time along with CK _{RX. When} transmitting data, the transfer request clock signal CK
Transmission data TX transferred from the controller in response to the _TX
-D MSK-modulates and outputs an analog MSK-modulated signal. The data to be transmitted / received is a 5-digit decimal, 20-bit group number GN, 2-digit decimal, 8-bit channel number C
H is control data consisting of a total of 80 bits including a 4-bit command code CC (stored in an internal ROM (not shown) of the controller) and a 48-bit calling code ID.

Reference numeral 15 denotes the output of the mute circuit 12 and the modem 1
Reference numeral 16 denotes a switch for switching the output. Reference numeral 16 denotes a transmission circuit for performing FM modulation of a baseband signal output from the switch 15, frequency conversion to a desired channel in a personal wireless band, and power amplification.
Is connected to the antenna 3 via the. Reference numeral 20 denotes an EEPROM storing a calling code of the personal transceiver, 2
Reference numeral 1 denotes a controller constituted by a microcomputer, which performs various controls such as incoming call control and outgoing call control.

FIGS. 6 and 7 are flowcharts showing the incoming call processing by the controller 21. Upon receiving the power-on operation, the controller 21 performs the following startup processing (FIG. 6).
Step 5 1). First, power is supplied to each unit (the transmission circuit 16
, And reads out the calling code from the EEPROM 20 and stores it in the built-in RAM 22 as an ID. Next, the mute circuit 12 turns on the mute, switches the antenna changeover switch 4 to the receiving side, outputs frequency control data corresponding to the control channel to the receiving circuit 5, and receives the control channel. Further, a reset signal R which falls to a low level for a certain period of time is output to the modem 13 for initialization. After the initialization, when the reset signal R becomes high level, the modem 13 enters the normal operation state, and the read bit clock signal CK _RX and the transfer request clock signal CK
Start _TX output. Thereafter, the controller 21 lowers the transmission enable signal TE to a low level,
3 is set to the reception enable state, "00000 ₁₀ " is registered as the initial value of the group number GN in the built-in RAM 22, and the process enters standby (step 51).

When the user inputs a five-digit group number using the ten keys 1, the controller 21 stores it as GN in the built-in RAM 22 (steps 52 and 53). When an MSK modulated signal of control data is received from the partner station through a control channel, the modem 13 performs MSK demodulation, outputs an incoming detection signal W, and receives one bit at a time in synchronization with the read bit clock CK _RX. Outputs data RX-D. When receiving the incoming call detection signal W, the controller 21 receives the reception data RX-D using the read bit clock CK _RX and stores it in the reception buffer area 220 of the internal memory 22 (steps 54 and 55). And the reception group number GN
_{If RX} matches the group number GN set by the user (YES in step 56), the reception channel number is set to CH _RX , and first, the group number GN and the channel number CH = C
The control data combining the H _RX , the command code CC, and the call code ID is created and stored in the transmission buffer area 221 of the built-in RAM 22 (step 57). Then, the frequency control data corresponding to the channel number CH = CH _RX is output to the receiving circuit 5, and the same communication channel as that of the other station is received (step 58).

When a voice signal is received from the partner station through the communication channel of channel number CH, the speaker 7
You can hear from. When new control data is received, the controller 21 determines that the reception group number is the group number G set by the user.
N is checked (steps 59-6)
1) If YES, return to step 59; if NO, switch to control channel reception and return to original standby (steps 62 and 52). Also, channel number C
When the receiving state on the communication channel H continues for 5 minutes, the process returns to the standby mode (YES in step 63).

[0008] When a call is desired to be made with a partner station, PTT. SW
Press 2. Then, the controller 21 determines YES in step 64, switches the antenna switch 4 to the transmitting side, outputs frequency control data corresponding to the channel number CH (= CH _RX ) to the transmitting circuit 16, and outputs the power of the transmitting circuit 16. The power is supplied to the amplifier circuit to set the transmission state on the communication channel which has been received (step 65).
Next, the transmission enable signal TE is set to the high level to set the modem 13 in the transmission enable state (step 66). After the changeover switch 15 is switched to the modem 13 side (step 70 in FIG. 7), the transfer input from the modem 13 is performed. In response to the request clock signal CK _TX , the control data in the transmission buffer area is transferred to the modem 13 as transmission data TX-D bit by bit (repeated steps 71 and 72).
The modem 13 performs MKS modulation of the transmission data TX-D, outputs the transmission data TX-D to the transmission circuit 16, and emits the transmission data by radio waves.

When the transfer of the control data is completed, the switch 14 is switched to the microphone side (step 73), and the mute of the mute circuit 12 is turned off (step 74).
Enables voice transmission. If the voice transmission state lasts for one minute, YES is determined in the step 75, the mute is turned on (step 76), and the process returns to the step 70 to transmit the control data again. When the group number in the control data received through the communication channel of the channel number CH matches the group number set by itself, the partner station can receive the voice transmitted from the other station.

[0010] When the user wants to shift to the receiving state, the PT
T. Release SW2. Then, the controller 21 determines YES in step 77, and first, the mute circuit 12
To turn on the mute to (step 78), switches the changeover switch 1 5 to the modem side (step 79), after which was transmitted control data (repetition of steps 80 and 81), to the power amplifier circuit of the transmitting circuit 16 The power supply is stopped to stop the emission of radio waves (step 82). Then, the transmission enable signal TE for the modem 13 is lowered to a low level (step 83). Next, the antenna changeover switch 4 is switched to the receiving side, and reception is performed on the communication channel of the channel number CH which has been transmitted (step 84, step 59 in FIG. 6).

The incoming call control process has been described above. In the case of the outgoing call control process, the PTT. SW
When "2" is pressed, an empty communication channel whose reception electric field strength in the reception circuit 5 is equal to or lower than a predetermined value is first searched, and then control data is transmitted through the control channel. Then, the process proceeds to the transmission on the communication channel, and the same processing as in step 70 and thereafter in FIG. 7 is performed. Thus, the personal transceiver is
Since the control data including the group number is transmitted and received, and the same communication channel is established between the stations having the same group number, it is possible to communicate with the desired partner station without any particular tuning operation by the user.

[0012]

However, in the above-mentioned conventional personal transceiver, PTT. While the switch 2 is pressed, even if the control data is not transmitted and the voice transmission is enabled, the modem 13 outputs the transfer request clock signal CK _TR and the read bit clock CK.
_Since it outputs _RX , the modem 13 and the controller 21
If the wiring between them is long, the transfer request clock signal CK _TX and the read bit clock signal CK _RX are radiated from the wiring and enter the transmission circuit 16, and are emitted from the antenna 3 to the outside to cause interference. there were. For this reason, the wiring between the modem 13 and the controller 21 must be made with the shortest distance, and there is a disadvantage that the circuit arrangement on the board is restricted. The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a wireless device with a modem that does not cause external interference due to unnecessary radiation.

[0013]

According to a first aspect of the present invention, there is provided a wireless device with a modem, which receives transfer of transmission data, modulates the signal into an analog signal for transmission, and outputs the same. In a wireless device with a modem, comprising: a transmitting unit that wirelessly transmits an analog signal to an external device, in a period of time when transmission data is not transferred to the modem, the operation of the modem is stopped to suppress unnecessary radiation, thereby suppressing unnecessary radiation. Means are provided. As a result, the operation of the modem is stopped while the transmission data is not transferred to the modem, so that the clock signal radiated from the modem wiring enters the transmission means, and is superimposed on the transmission signal from the antenna to the external space. The problem of interference and interference to the other station does not occur. Therefore, it is not necessary to minimize the wiring of the modem, and the degree of freedom in circuit layout on the board is increased.

According to a fifth aspect of the present invention, there is provided a wireless device with a modem, which receives transfer of transmission data, modulates the signal into an analog signal for transmission, and outputs the signal. Data transfer means for transferring the transmitted data or externally input transmission data to the modem, a microphone for converting voice into an electric signal, a transmission instruction operation means for performing a transmission instruction operation, and transmission instructed by the transmission instruction operation means. During a certain period or a plurality of periods during which data transmission is performed, a data transmission instruction is given to the data transfer unit, and an analog signal output from the modem is wirelessly transmitted to the outside by the transmission unit, and the transmission is instructed by the transmission instruction operation unit. And transmission control means for transmitting the microphone input to the outside by the transmission means during a period in which transmission data is not transferred to the modem while the transmission is being performed. In a wireless device with a modem, unnecessary transmission suppression means for stopping operation of the modem and suppressing generation of unnecessary radiation is provided during a period when transmission data is not transferred to the modem while transmission is instructed by the transmission instruction operation means. Was it,
It is characterized by.

Thus, for example, during a transmission instruction, such as a personal radio, a voice input from a microphone is transmitted to the outside during one or a plurality of periods during which data is transmitted using a modem. During this period, the operation of the modem is automatically stopped, so that the clock signal radiated from the modem wiring enters the transmitting means, is radiated from the antenna to the external space in a form superimposed on the transmitted signal, and The problem of interfering with the object does not occur. Therefore, it is not necessary to minimize the wiring of the modem, and the degree of freedom in circuit layout is increased.

In the wireless device with a modem according to the first and fifth aspects, the unnecessary radiation suppressing means can stop the operation by keeping the modem in a reset state. The operation of the modem can also be stopped by stopping the power supply to the modem.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG.
One embodiment will be described. FIG. 1 is a block diagram of a personal transceiver according to the present invention, and the same components as those in FIG. 5 are denoted by the same reference numerals. The controller 21A composed of a microcomputer performs the same incoming call control processing and outgoing call control processing for each part of the set as in the prior art. Among these control processing, the PTT. While the control data is not transferred to the modem 13 while the switch SW2 is pressed, the reset signal R is held at a low level, and then returned to a high level immediately before the next transfer of the control data. ing.

The modem 13 initializes when the reset signal R falls to a low level, but keeps the initialization state (reset state) until the reset signal R does not return to a high level. Since the operation is stopped, the transfer request clock signal CK _TX and the read bit clock signal CK _RX
Is stopped, and these clock signals are not radiated into the space from the wiring between the controller 21A and the modem 13. When the reset signal R returns from the low level to the high level, the modem 13 enters a normal operation state. The other components of the personal transceiver are configured exactly the same as in FIG.

Next, an incoming call control process by the controller 21A will be described with reference to FIG. FIG. 2 is a flowchart showing a part of the incoming call control process by the controller 21A, and represents a process following Step 66 of FIG. When the power-on operation is performed, the controller 21
A performs exactly the same processing as in FIG. 6, performs a predetermined start-up processing, enters standby on the control channel (steps 50 and 51 in FIG. 6), and stores the group number input by the user with the ten keys 1. (Steps 52 and 53). When the control data is received, it is checked whether or not the reception group number matches the group number set by the user (steps 54 to 56). If the control group data matches, the control data for transmission is created, and then the communication channel indicated by the reception channel number is used. (Steps 57 and 58), and the other party's voice is output from the speaker 2.

If new control data is received during reception on the call channel, it is checked whether the reception group number matches the group number GN set by the user (step 5).
9-61), if YES, return to step 59, NO
If so, it switches to receiving the control channel and returns to the original standby (steps 62 and 52). Also, when the reception state on the communication channel of the channel number CH continues for 5 minutes, the process returns to the standby mode (YES in step 63). The above is exactly the same processing as in the related art.

When a user wants to talk with a partner station during reception on a communication channel, the PTT. Press SW2. Then, the controller 21A determines YES in step 64, and first switches the antenna switch 4 to the transmitting side.
The frequency control data corresponding to the channel number CH (= CH _RX ) is output to the transmitting circuit 16, and the power is supplied to the power amplifying circuit of the transmitting circuit 16 so as to be in the transmitting state on the communication channel which has been received (step). 65). Next, the transmission enable signal TE is set to the high level to set the modem 13 in the transmission enable state (step 66). And FIG.
After the changeover switch 15 is switched to the modem 13 side (step 700), in response to the transfer request clock signal CK _TX input from the modem 13, one bit is
The control data in the transmission buffer area is transferred to the modem 13 as transmission data TX-D (steps 710 and 720 are repeated). The modem 13 performs MKS modulation of the transmission data TX-D, outputs the transmission data TX-D to the transmission circuit 16, and emits the transmission data by radio waves.

When the transfer of the control data of all 80 bits is completed, the controller 21A drops the reset signal R output to the modem 13 to a low level and holds it (step 721). As a result, the modem 13 remains in the initialized state and stops operating, and the transfer request clock signal C
The output of K _TX and the read bit clock signal CK _RX stops. Thereafter, the changeover switch 14 is switched to the microphone side (step 730), and the mute of the mute circuit 12 is turned off to enable the transmission of sound (step 74).
0). If the voice transmission state lasts for one minute, YE is determined in step 750.
After determining S, the mute is turned on (step 76).
0), the reset signal R is raised to a high level (step 761). Thereby, the initialization of the modem 13 is completed, and the modem 13 returns to the normal operation state. After this, the controller 21
A returns to step 700 and transmits control data again. When the group number in the control data received through the communication channel of the channel number CH matches the group number set by itself, the partner station can receive the voice transmitted from the other station.

When the user wants to shift to the receiving state, the PT
T. Release SW2. Then, the controller 21A determines YES in step 770, turns on the mute for the mute circuit 12 (step 780), raises the reset signal R to the high level, and returns the modem 13 to the normal operation state (step 770). 781). Then, the changeover switch 14 is switched to the modem side (step 7).
90), after transmitting the control data (step 80)
0, 810), the power supply to the power amplifying circuit of the transmitting circuit 16 is stopped, and emission of radio waves is stopped (step 8).
20). Then, the transmission enable signal TE for the modem 13 is lowered to a low level (step 830). Next, the antenna changeover switch 4 is switched to the receiving side,
The reception is performed on the communication channel of the channel number CH which has been transmitted up to that time (step 840). Thereafter, the process proceeds to step 59 in FIG. 6 and performs the same processing as described above.

Although the incoming call control process by the controller 21A has been described above, in the case of the outgoing call control process, the PTT. When the switch SW2 is pressed, an empty communication channel whose reception electric field strength in the reception circuit 5 is equal to or less than a predetermined value is first searched, and then control data is transmitted through the control channel. Then, the process shifts to transmission on the communication channel, and the same processing as in step 700 and thereafter in FIG. 2 is performed.

According to this embodiment, the controller 2
Reference numeral 1 has a function as unnecessary radiation suppressing means. That is, when the user sets PTT. During the period when the control data is transferred to the modem 13 and the voice input from the microphone 10 is transmitted to the outside during one or more periods during which the control data is transferred to the modem 13 while the transmission is instructed by pressing the SW2, , Modem 1
3 keeps the reset signal output low,
3 is kept in the initialized state and the operation is stopped. Therefore, the transfer request clock signal CK _TX and the read bit clock signal CK _RX are not output to the wiring between the modem 13 and the controller 21A. After the clock signal is radiated from the wiring to the space, the clock signal enters the transmission circuit 16 and is not radiated from the antenna 3 to the external space in a form superimposed on the transmission signal, thereby causing a problem of interfering with the partner station. Therefore, it is not necessary to minimize the wiring of the modem, and the degree of freedom in circuit layout is increased.

In addition, since the operation of the modem 13 is stopped during the voice transmission period, the power consumption of the modem 13 is greatly reduced, and power can be saved. Furthermore, since the operation of the modem 13 can be stopped and restarted only by controlling the level of the reset signal, the load on the circuit configuration is less increased than in the related art.

In the above-described embodiment, the controller 21A transmits the PTT. During the period in which control data is transferred to the modem 13 while the switch SW2 is pressed and the voice input from the microphone 10 is transmitted to the outside except for the period of transmission to the outside, the reset signal output to the modem 13 is output. The operation is stopped by keeping it at low level, but unlike this, the operation clock CK from the oscillator 14 is
_The operation may be stopped by stopping the input of ₀ .
Specifically, as shown in FIG.
A switch 40 is provided between the operation clock input terminal CK _IN and the controller 21A.
Until performs the processing of step 720, so as to provide an operation clock CK ₀ closes switch 40 to the modem 13, the operation clock CK opens switch 40 instead of dropping a reset signal to the low level at step 721
The input of ₀ is stopped, the operation of the modem 13 is stopped, and instead of raising the reset signal to a high level in steps 761 and 781, the switch 40 is closed and the input of the operation clock CK ₀ is restarted, and the modem 13 is operated again. .

Further, when the user sets the PTT. During the period when the control data is transferred to the modem 13 while the switch SW2 is pressed and the voice input from the microphone 10 is transmitted to the outside except for the period during which the control data is transmitted to the outside, the power supply to the modem 13 is stopped. The operation may be stopped. In particular,
As shown in FIG. 4, the power supply and the power supply input terminal V _{IN of the} modem 13
Is provided between the controller 21 and the controller 21.
2A, after the power-on operation, until the processing of step 720 in FIG. 2 is performed, the switch 41 is closed to supply power to the modem 13, and in step 721, the switch 41 is opened and power is supplied instead of dropping the reset signal to a low level. Is stopped, the operation of the modem 13 is stopped, and steps 761 and 7
Instead of raising the reset signal to a high level at 81, the switch 41 is closed to restart power supply, and the modem 13 is operated again.

In the above-described embodiment, the personal transceiver capable of transmission / reception has been described as an example. However, the present invention is not limited to this. The present invention can be similarly applied to a wireless device to perform.

[0030]

According to the present invention, the operation of the modem is stopped while the transmission data is not transferred to the modem, so that the clock signal radiated from the wiring of the modem enters the transmission means and is superimposed on the transmission signal. Thus, there is no problem that the antenna is radiated from the antenna to the external space and interferes with the other station. Therefore, it is not necessary to minimize the wiring of the modem, and the degree of freedom in circuit layout on the board is increased.

[Brief description of the drawings]

FIG. 1 is a block diagram of a personal transceiver according to one embodiment of the present invention.

FIG. 2 is a flowchart showing a part of an incoming call control process of a controller in FIG. 1;

FIG. 3 is a block diagram of a main part of a personal transceiver according to another embodiment of the present invention.

FIG. 4 is a block diagram of a main part of a personal transceiver according to still another embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional personal transceiver.

FIG. 6 is a first flowchart illustrating an incoming call control process of the controller in FIG. 5;

FIG. 7 is a second flowchart showing an incoming call control process of the controller in FIG. 5;

[Explanation of symbols]

2 PTT. SW 3 Antenna 10 Microphone 13 Modem 14 Oscillator 15 Changeover switch 16 Transmission circuit 20 EEPRO
M 21A Controller 22 Built-in RAM

Claims (8)

(57) [Claims] 1. A modem comprising: a modem for receiving transmission data, modulating the analog signal for transmission and outputting the analog signal; and transmitting means for wirelessly transmitting the analog signal output from the modem to the outside. A wireless device with a modem, characterized in that the wireless device is provided with unnecessary radiation suppression means for stopping the operation of the modem during a period in which transmission data is not transferred to the modem to suppress the generation of unnecessary radiation. 2. The wireless device with a modem according to claim 1, wherein the unnecessary radiation suppressing means keeps the modem in a reset state while transmission data is not transferred to the modem. 3. The wireless device with a modem according to claim 1, wherein the unnecessary radiation suppressing means stops an operation clock of the modem during a period when transmission data is not transferred to the modem. 4. The wireless device with a modem according to claim 1, wherein the unnecessary radiation suppressing means stops power supply to the modem during a period when transmission data is not transferred to the modem. 5. A modem for receiving transmission of transmission data, modulating the transmission analog signal and outputting the same, and receiving a data transmission command, the transmission data read from the storage means or the transmission data input from the outside is transmitted to the modem. , A microphone for converting voice into an electric signal, a transmission instruction operation means for performing an instruction for transmission, and one or more periods during which transmission is instructed by the transmission instruction operation means A data transmission command to the data transfer means and transmit the analog signal output from the modem wirelessly to the outside by the transmission means, and the transmission data is transferred to the modem while the transmission is instructed by the transmission instruction operation means. During a period in which the microphone input is not performed, the transmission control means for transmitting the microphone input to the outside by the transmission means. Wireless transmission with a modem, characterized in that an unnecessary radiation suppression means for stopping the operation of the modem and suppressing the generation of unnecessary radiation is provided during a period in which transmission data is not transferred to the modem while the communication is instructed. . 6. The unnecessary radiation suppressing unit is configured to keep the modem in a reset state while transmission data is not input to the modem while transmission is instructed by the transmission instruction operation unit. A wireless device with a modem according to claim 5. 7. The unnecessary radiation suppressing means stops the operation clock of the modem while transmission data is not input to the modem while transmission is instructed by the transmission instruction operation means. The wireless device with a modem according to claim 5. 8. The unnecessary radiation suppressing means stops power supply to the modem while transmission data is not input to the modem while transmission is instructed by the transmission instruction operation means. The wireless device with a modem according to claim 5.