JPH0595318A - Radio selective calling device - Google Patents

Abstract

PURPOSE:To provide the radio selective calling device which controls a voice ON/OFF control signal to a radio equipment to be in the OFF position and does not output an undesired voice after the end of communication even when an end signal from a station during communication cannot be detected due to reception interference from other station than a station during communication. CONSTITUTION:The device is provided with a means 7 outputting a frame synchronization detection signal 9 when a frame synchronization pattern is detected from reception pattern, a means 8 outputting a call detection signal 10 when the call signal pattern is detected, a 1st AND means 12 inputting the frame synchronization detection signal 9 and a call detection signal 10, a 2nd AND means 13 inputting the frame synchronization detection signal 9 and the logical inverse of the call detection signal 10, and a means 14 controlling a voice output of a receiver to be ON when an AND output of the 1st AND means goes to a high level and a voice output of a receiver to be OFF when an AND output of the 2nd AND means goes to a high level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved radio selective calling device.

[0002]

2. Description of the Related Art An embodiment of the prior art which is the basis of the present invention will be described below with reference to FIG. The data used in this conventional example is composed of 24 bits of bit synchronization, 31 bits of frame synchronization, 63 bits of ID number, and 36 bits of additional signal.

In the figure, reference numeral 3 is a serial / parallel converter which converts a serial reception data signal input from the reception data signal input terminal 1 into a parallel data signal of 130 bits in total including frame synchronization, an ID number and an additional signal. Among the parallel data signals, the bit data signal 4 corresponding to the frame synchronization signal is output to the comparator 7, and the bit data signal 6 corresponding to the additional signal is output to the comparator 8 and the comparator 16, respectively.

Reference numeral 7 denotes a comparator, which receives a data signal 4 of a bit corresponding to the frame synchronization signal output from the serial / parallel converter 3 and compares it with a frame synchronization pattern to generate a frame synchronization detection signal 9 when they match. Output. Reference numeral 8 is a comparator, which receives the data signal 6 of a bit corresponding to the additional signal output from the serial / parallel converter 3 and outputs a ringing detection signal 10 when compared with the ringing signal pattern. Reference numeral 16 is a comparator, which also receives the data signal 6 of the bit corresponding to the additional signal output from the serial / parallel converter 3 and outputs the end detection signal 17 when compared with the end signal pattern and coincides.

An AND gate 12 receives the output signals of the comparators 7 and 8 and its logical product output is connected to the set input terminal of a set / reset type flip-flop 14. An AND gate 13 receives the output signals of the comparators 7 and 16 and the logical product output is a set / reset type flip-flop 14
Connected to the reset input terminal of. Reference numeral 14 is a set / reset type flip-flop, the output of which is voice O.
It is connected to the N / OFF control signal output terminal 15.

This operation will be described below with reference to FIGS. 2 and 3. In FIG. 3, a serial reception data signal synchronized with the reception clock signal input from the reception clock signal input terminal 2 is input from the reception data signal terminal 1 and converted into parallel data by the serial / parallel converter 3. The parallel data is composed of 130 bits. The 1st to 31st bits correspond to the frame synchronization, the 32nd to 94th bits correspond to the ID number, and the 95th to 130th bits correspond to the additional signal.

As described above, the data signal 4 of the 1st to 31st bits corresponding to the frame synchronization signal is input to the comparator 7, and when it is compared with the frame synchronization pattern and coincides, the frame synchronization detection signal 9 is output. It
Further, the data signal 6 of the 95th to 130th bits corresponding to the additional signal is input to the comparators 8 and 16 and compared with the calling signal pattern in the comparator 8 and the calling detection signal 10 is output when they match. Further, the comparator 16 compares with the end signal pattern, and when they match, the end detection signal 17 is output.

Call signal 2 during operation period 1 shown in FIG.
When 6 is received, the output of the AND gate 12 becomes high level (hereinafter referred to as H) due to the output of both the frame synchronization detection signal 9 and the call detection signal 10, and the set / reset type flip-flop 14 is activated. Is set.
As a result, the voice O output from the flip-flop 14 is output.
The N / OFF control signal 21 is controlled to be ON. When the end signal 27 is received, the frame synchronization detection signal 9
The outputs of the AND gate 13 and the end detection signal 17 both cause the output of the AND gate 13 to become H, and the set / reset type flip-flop 14 is reset. As a result, the voice ON / OFF control signal 21 is controlled to be OFF.

Similarly, when the ringing signal 26 is received even in the operation period 2 of FIG. 2, the AND gate 1 is output by the output of both the frame synchronization detection signal 9 and the ringing detection signal 10.
The output of 2 becomes H, and the set / reset type flip-flop 14 is set again. As a result, the voice ON / OFF control signal 21 is controlled to be ON again. Here, a case where communication is interrupted by data reception from a transmitting station other than the transmitting station will be described. As shown in the operation period 2 in FIG. 2, the voice ON / OFF control signal is ON.
When the end signal 27 cannot be normally received from the transmitting station that is communicating due to receiving an interfering signal from a station other than the communicating station during the period, the above-mentioned end detection signal 17 is not output and the flip-flop 14 is not reset. Therefore, voice ON
The / OFF control signal 21 remains ON and is not released.

[0010]

As described above, in the above-mentioned prior art, the termination from the transmitting station in communication is caused by the interfering signal from a station other than in communication while the voice ON / OFF control signal is ON. If the signal cannot be received, voice ON / OFF
Since the control signal remains ON and is not released, there is a drawback that unnecessary voice continues to be output even after the end of communication. The present invention has been made in view of this drawback. Even when the termination signal from the communicating station cannot be received due to an interfering signal from a station other than the communicating station while the voice ON / OFF control signal is ON, It is an object of the present invention to provide a wireless selective calling device in which an unnecessary voice is not output after the communication is completed by turning off the voice ON / OFF control signal.

[0011]

In order to achieve the above object, the present invention has conventionally performed the reset control of the flip-flop 14 with a logical product signal of a frame synchronization detection signal and an end detection signal. , The logical product signal of the frame sync detection signal and the logical inversion signal of the ringing detection signal.

[0012]

As a result, even when a received data signal from a station other than the communicating station is input to the received data signal input terminal while the voice ON / OFF control signal is ON, the received data signal from the station other than the communicating station is input. When the frame synchronization signal of the received data is detected, the logical product signal of the frame synchronization detection signal and the inversion signal of the call detection signal becomes H, and the flip-flop is reset. As a result, the voice ON / OFF control signal can be controlled to be OFF.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The data used in the embodiment of the present invention is the same as the conventional embodiment, that is, bit synchronization is 24 bits, frame synchronization is 31 bits, ID number is 63 bits, and additional signal 3 is used.
It consists of 6 bits.

In FIG. 1, reference numeral 3 denotes a serial / parallel converter which converts a serial reception data signal input from the reception data signal input terminal 1 into a parallel data signal and outputs a signal 4 corresponding to a frame synchronization signal to the comparator 7. Then, the signal 6 corresponding to the additional signal is output to the comparator 8. The parallel data is 130 bits as in the conventional device, and the 1st to 31st bits are the frame synchronization, the 32nd to 94th bits are the ID number, and the 95th.
Bits 130 to 130 correspond to the additional signal.

Reference numeral 7 denotes a comparator, which compares the 1st to 31st bits of the data signal 4 corresponding to the frame synchronization signal output from the serial / parallel converter 3 with the frame synchronization pattern, and when they match, the frame synchronization is performed. The detection signal 9 is output. 8 is a comparator, serial /
The data signal 6 of the 95th to 130th bits corresponding to the additional signal output from the parallel converter 3 is compared with the calling signal pattern, and when they match, the calling detection signal 1
Outputs 0.

Reference numeral 11 denotes an inverter, which logically inverts the ringing detection signal 10 output from the comparator 8. 12 is A
The ND gate inputs the output signals of the comparators 7 and 8 to obtain a logical product, and the output is connected to the set input terminal of the set / reset type flip-flop 14. An AND gate 13 inputs the output signals of the comparator 7 and the inverter 11 to obtain a logical product, and the output is connected to the reset input terminal of the set / reset type flip-flop 14. Reference numeral 14 is a set / reset type flip-flop, the output of which is voice ON.
It is connected to the / OFF control signal output terminal 15.

This operation will be described below with reference to FIG. The parallel data is 130 bits as in the conventional device, and the 1st to 31st bits are the frame synchronization, the 32nd to 94th bits are the ID number, and the 95th.
Bits 130 to 130 correspond to the additional signal.

The ringing signal 2 during the operation period 1 shown in FIG.
When 6 is received, the output of the AND gate 12 becomes H by the output of both the frame synchronization detection signal 9 and the call detection signal 10, and the set / reset type flip-flop 14 is set. This enables voice ON / OF
The F control signal 22 is controlled to be ON. Further, when the frame synchronization signal 24 of the next received data is received, both the frame synchronization detection signal 9 and the inverted signal of the ringing detection signal 10 become H and the output of the AND gate 13 becomes H, so that the set / reset type Flip-flop 14 is reset. As a result, the voice ON / OFF control signal 2
2 is controlled to OFF.

When the ringing signal 26 is received even in the operation period 2, the frame synchronization detection signal 9 and the ringing detection signal 10 are received.
The output of the AND gate 12 becomes H by both the outputs of the
Is set. As a result, the voice ON / OFF control signal 22 is turned ON again. Here, even when the reception data signal 20 which interferes with the reception of the end signal is received from a station other than the transmitting station which is communicating during the period when the audio signal is ON, the frame synchronization signal 24 in the reception data signal 20 is received. When detected, the logical product signal of the frame synchronization detection signal and the inverted signal of the call detection signal becomes H, and the flip-flop 14 can be reset. As a result, the voice ON / OFF control signal 22 can be controlled to be OFF.

[0020]

According to the present invention, in the radio selective calling device, the end signal from the communicating station is received by the interfering signal from a station other than the communicating station while the voice ON / OFF control signal is ON. Even if it is not possible, the voice ON / OFF control signal can be turned off, and the voice output of the receiver can be cut off. Therefore, unnecessary voice output is eliminated after the communication is completed, and the effect is remarkable.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart diagram for explaining the operation of the related art and the present invention.

FIG. 3 is a block diagram showing a conventional example of a radio selective calling device.

[Explanation of symbols]

1 ... Received data signal input terminal, 2 ... Received clock signal input terminal, 3 ... Serial / parallel converter, 4 ... Frame synchronization signal, 5 ... ID number signal, 6 ... Additional signal, 7 ... Comparator A, 8 ... Comparator B , 9 ... Frame sync detection signal, 10 ... Ring detection signal, 11 ... Inverter, 12
... AND gate A, 13 ... AND gate B, 14 ... Set / reset type flip-flop, 15 ... Voice ON / OFF control signal output terminal, 16 ... Comparator C, 17 ... End detection signal, 18 ... PTT of transmitting station signal,
19 ... Transmission data, 20 ... Transmission data of stations other than the communicating station, 21 ... Conventional voice ON / OFF control signal, 22 ...
Voice ON / OFF control signal according to the present invention, 23 ... bit synchronization, 24 ... frame synchronization, 25 ... ID number, 26 ... call signal, 27 ... end signal, 28 ... ID other than the communicating station
No., 29 ... Additional bits other than the communicating station.

Claims (1)

[Claims] 1. A radio selective calling device that performs selective calling using an identification code including a frame synchronization signal and a calling signal and a termination signal added to the identification code, detects a frame synchronization pattern from received data. And a means for outputting a frame synchronization detection signal, a means for outputting a call detection signal when a calling signal pattern is detected, a first logical product means for receiving the frame synchronization detection signal and the calling detection signal, and Second AND means for inputting the frame sync detection and the logical inversion signal of the call detection signal, and when the first AND output becomes high level, the voice output of the receiver is turned ON, and the second And a means for controlling the voice output of the receiver to be OFF when the logical product output of the above becomes high level.