JPS60107929A - Speech channel monitoring device of personal radio equipment - Google Patents

Abstract

PURPOSE:To acquire speedily a target opponent side of communication by comparing selective call data such as a frame synchronizing signal and a group code on real-time basis, and monitoring a target speech channel. CONSTITUTION:When a monitor switch 13 is turned on, a control circuit 15 outputs a control signal, and channel scanning data which are selected at random are outputted from an automatic scanning PLL data generating circuit 18 to a PLL circuit 10 to start monitor receiving operation. When they are received over a speech channel selected at random, the frame synchronizing signal and group code in the receive signal are detected by a modem 12. Then, a frame testing circuit 16 compares this frame synchronizing signal with a frame synchronizing signal read out of ROM20 on real-time basis. When they coincide with each other, a coincidence signal is outputted from the testing circuit 16 to the PLL data generating circuit 18, which waits for a signal from a group code testing circuit 17. Then, the group code testing circuit 17 compares the group code of a reception speech channel with the group code of its station read out of RAM19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows an operator to quickly and comfortably monitor the desired communication channel when monitoring the communication channel of another station using a personal radio.

The present invention relates to a call channel monitoring device that allows participation in the call.

Generally, when monitoring the call channels of other stations using a personal radio, one call channel is randomly received from among a large number of call channels by changing the channel scan data, and the selective call data of the receiving channel station is Channel scanning is performed until the selective call data matches the selected call data, and a call operation is started with the call channel station whose selective call data matches. Conventionally, in such a monitor reception operation, as shown in Fig. 1, when the monitor switch is turned on and the monitor reception operation begins, the signal of the channel corresponding to the channel scan data is input to the reception section, and this reception Channel scanning is repeated until the input power exceeds the threshold.
When the threshold is exceeded, the channel is received as a call channel. The operator listens to the content of the call from this receiving channel station as audio for a certain period of time (for example, 10 seconds), and the channel scan is repeated until the operator confirms that the person on the other end of the communication is the intended party. After confirming that it was the other party, the channel scan data was fixed, and if the selective call data matched, the call operation was enabled. In this way, it is a monitor-only system that listens to the communication content of the call channel randomly selected and received by channel scan, confirms the communication content of the target party, and then fixes the channel scan data. There are disadvantages such as it takes time to search for a communication channel, and there is also a need to wait for unnecessary communication contents. Furthermore, even if an attempt was made to increase the channel scan speed by shortening the listening time for the communication content, there was a limit to how much the channel scan speed could be increased because it would take at least 10 seconds to judge the communication content by ear.

The present invention has been made in view of the above points, and includes a comparison means for comparing selective call data of a communication channel randomly selected and received based on channel scan data with selective call data of the local station, and a comparison means for comparing the selective call data of the own station. muting means for turning off and on muting of the audio output stage of the receiving section of the personal radio device based on the presence or absence of a matching output;
By providing a channel fixing means for fixing the channel scan data based on the matching output of the comparing means to enable a telephone call operation, it is possible to quickly and comfortably monitor a target communication channel.

An embodiment of the present invention will be described below with reference to FIGS. 2, 3, 4, and 5.

FIG. 2 shows a receiving section of a personal radio equipped with a transmitting section and a receiving section, and in the figure, (1) is an antenna. The antenna (1) includes a high frequency amplification circuit (2).
), mixing circuit (3), IF circuit (intermediate frequency amplification circuit) (
4), detection circuit (5), and audio amplification circuit (6).

A gate circuit (7), a power amplifier circuit (8) and a speaker (9) are connected in sequence. (10) is a PLL (phase-locked loop) circuit as a frequency synthesizer, and this PLL circuit (lO) performs the first channel (903,0125M1lz) based on channel scan data from a microcomputer (11), which will be described later. ) to the 80th channel (904, 9875M117.) to the mixing circuit (3), and when receiving the signal, the mixing circuit (3)
A predetermined intermediate frequency signal is output from the IF circuit (4). A MODEM (modulator/demodulator) (12) as an A/D converter is connected to the other output side of the detection circuit (5), and this MODEM (12) converts the detected output into the received signal. It is configured to detect and output the included control signals. The control signal is mainly sent on the first channel as a control channel, and as shown in FIG.
) is used to notify the other party of the timing of the synchronization signal (50 bits) and the start position of the target data in advance.

Frame synchronization signal (1
5 bits) and the target data (172 bits 1-). The data for this purpose (to 172 pits 1) is.

As shown in Fig. 4, a group code (20 bits) is obtained by converting a 5-digit number into BCD as reliable and changeable selective call data for identifying the other party, and The channel code (8 bits) obtained by converting the call channel numbers up to 80 into binary, the preliminary command code (4 bits), the calling name (48 bits), and the bi-soto error of the data to be sent. Vergel for correction processing...? - Gar code (92 bits). (13) is a monitor switch for starting a monitor operation, and (14) is an own station group code input terminal for inputting the own station's group code. The microcomputer (
11) is for controlling the sonal radio, and is configured as follows. A control circuit that outputs control signals for monitor operation to the verification circuit (16), the group code verification circuit (17) as a second comparison means for selective call data, and the auto scan PLL data creation circuit (18). ,(
19) is a RAM (random access memory) (20) that stores the group code of the own station input from the own station group code input terminal (14) via the control circuit (15);
is a ROM (read-only memory) that stores a frame synchronization signal, and (21) is an AND circuit. The frame verification circuit (16) and the group code verification circuit (17) constitute comparison means (23). The frame verification circuit (1
6) has the output side of the MODEM (12) and the ROM (20) connected to its input side, and compares the frame synchronization signal contained in the reception channel with the frame synchronization signal in the ROM (20). , when both match, the match signal is sent to the auto scan PLL data creation circuit (
18) and the input side of the AND circuit (21). The AND circuit (21
) and the gate circuit (7) constitute muting means (22). The group code verification circuit (17) has an input side coupled with the output side of the MODE M (12) and the output side of the RAM (19), and has a group code included in the reception channel; The group code in the RAM (19) is compared, and when the two match, a match signal is sent to the other input side of the auto scan PLL data creation circuit (18) and the other input side of the AND circuit (21). It is configured to output to.

The auto scan PLL data creation circuit (18) includes the frame verification circuit (16) and the group code verification circuit (
The PLL circuit (17) uses the PLL data to fix the channel scan data when a matching signal is input from both of the circuits (17) and to randomly change the channel scan data at other times.
O). The output side of the AND circuit (21) is coupled to the gate circuit (7),
This gate circuit (7) is configured to be in a conductive state or a non-conductive state depending on the presence or absence of an output from the AND circuit (21).

Next, the present invention will be explained in detail using the flowchart shown in FIG. In advance, input the same group code as the target communication channel from the own station group code input terminal and store it in RAM (19).

Next, when the monitor switch (13) is turned on, the control signal for monitor operation is sent from the control circuit (15) to the auto scan 1) L L data creation circuit (18), the frame verification circuit (16), and the group code verification circuit (17). ), and the randomly selected channel scan data is sent to the scanning PLL data creation circuit (18
) to the 1-' LL circuit (10) and enters monitor reception operation. When a communication channel randomly selected from 79 waves of communication channels 2nd to 80th is received, the frame synchronization signal and group code included in this received signal are determined by MODEM (12). Detected. Next, the frame verification circuit (16) compares this frame synchronization signal with the frame synchronization signal read from the ROM (20) in real time (111).

If the comparison results do not match, that is, if there is a mismatch of 1 or more bits among the 15 bits that make up the frame synchronization signal, a mismatch signal is sent from the frame verification circuit (16) to the PLL data creation circuit for auto scan. (18)
At the same time, the L level signal is output to the AND circuit (21
) is entered. Therefore, the output side of the AND circuit (21) is at the L level, making the gate circuit (7) non-conducting, the received signal of the communication channel is blocked by the gate circuit (7), and the sound is output from the speaker (9). is not output. Next, a signal for changing the channel scan data is input to the auto scan PLL data creation circuit (18), and the corresponding channel scan data is output from this circuit (18) to the PLL data creation circuit (18).
When output to the L-L circuit (10), the next randomly selected communication channel is received. Then, in the same manner as described above, the frame synchronization signal and the group code are detected, the frame synchronization signals are compared, and when they do not match, an O1-scan is performed in which the above-described operation is repeated. When the frame synchronization signals match, that is, when all 15 pins match, a match signal is output from the frame verification circuit (16) to the auto scan PLL data creation circuit (18), and this auto scan The PLL data creation circuit (18) waits for a signal from the group code verification circuit (17). At the same time, from the frame verification circuit (16) to the AND circuit (2)
1), an H level signal is output. Next, the group code verification circuit (17) receives the group code of the i11th episode channel and R.
A M (19) is compared with the own station's group code read out in real time, and if the comparison result is a mismatch, that is, if there is a If there is a mismatch, a mismatch signal is input to the auto-scan PLL data creation circuit (18), resulting in auto-scan.

When the group code of the receiving call channel and the group code set at your own station match, a matching signal is sent to the PLL for auto skin 1.
The signal is output to the data creation circuit (18) and the (level signal) is output to the AND circuit (21).

For this reason, the O1-scan PLL data creation circuit (
18) to the P L Ll path (lO) is fixed, and the AND circuit (21) outputs a 1 level signal to the circuits 1 to 7. - The circuit (7) becomes conductive, the sound of the target communication channel is output from the speaker (9), and the communication operation becomes possible. Therefore, the operator can change from the monitoring state to the talking state by pressing the PTT switch (not shown).

The communication channel monitoring device according to the present invention is configured to monitor the target communication channel by comparing selective call data such as frame synchronization signals and group codes in real time as described above, so that the target communication channel can be quickly determined. It is possible to capture the other party of the communication. Furthermore, since a muting means is provided to mute the communication contents of those other than the intended communication party, there is no need to listen to unnecessary communication contents, and the monitor operation is comfortable.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a conventional example, and FIG. 2 shows a personal pI according to the present invention! :A block diagram showing an embodiment of a call channel monitor device of an IIA machine; FIG. 3 is a configuration diagram showing the configuration of a control signal; FIG. 4 is a configuration diagram showing the data content of the control signal in FIG. 3. FIG. 5 is a flowchart illustrating the present invention in detail. (7)...Gate circuit, (10)-PLL circuit, (12)-MO'DEM (modulator/demodulator), (16)...
・Frame verification circuit, (■7)...Group code verification circuit, (18)...Auto scan PLL data creation circuit (including channel fixing means), (21)...AND circuit, (22) ...Muting means (Goo 1
- consisting of circuit (7) and AND circuit (21)), (2
3) Comparison means (consisting of a frame verification circuit (1G) and a group code verification circuit (17)).

Claims (1)

[Claims] (1) Equipped with a transmitter and a receiver, when operating a call channel monitor, a plurality of call channels are randomly received by changing channel scan data, and the selective call data of this receiving channel is the selection set by the own station. In a personal radio device which starts a call operation when the call data matches, a comparison means for comparing the selective call data of the receiving channel and the selective call data of the own station, and whether or not there is a match output of the comparison means are provided. muting means for turning off and on muting of the audio output stage of the receiving section based on the matching output of the comparing means; and channel fixing means for fixing the channel scan data to enable communication operation based on the matching output of the comparing means. A communication channel monitoring device for a personal radio device, which is characterized by: (2. The communication channel monitoring device for a personal radio according to claim 1, wherein the selective call data to be compared by the comparison means includes a group code signal whose settings can be changed and a frame synchronization signal which is set in a fixed manner.