JPH0697852A - Simplex/duplex switching radio machine - Google Patents

Abstract

PURPOSE:To quickly switch an operation mode without troubling operator's hands by providing a switching part which performs switching between press-to-talk communication and simultaneous transfer communication in accordance with detection or non/detection of a synchronous signal. CONSTITUTION:When the synchronous signal from the other party of communication is not detected, a control part 22a connects switches 20 and 21 to the (a) side to output the output of a demodulating part 14 to a speaker 16 in the same manner as conventional. When the synchronous signal is detected by a synchronism detection part 10, the control part 22a turns on the operation of transfer switching part 11 and outputs a transfer switching signal to switch a transfer part 15 to transmission and reception. The control part 22a connects the switch 21 to the (b) side and inputs the transmission voice, which is compressed to a half time of the synchronous signal period, to a modulating part 13 and sets the simultaneous transfer mode. If the detection of the synchronous signal is interrupted, the control part 22a connects the switch 21 to the (a) side and is returned to the press-to-talk speech mode. That is, the output of the synchronism detection part 10 is inputted to the control part 22a, and switching between both modes is performed in accordance with the presence of the synchronous signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simplex / duplex switching radio which simultaneously transmits and receives by using the same frequency for transmission and reception.

[0002]

2. Description of the Related Art There are radios that perform simultaneous transmission / reception communication using the same frequency for transmission and reception. This is a synchronization signal generator for notifying the other party of the switching timing of transmission and reception, a synchronization signal detector for detecting the synchronization signal from the received signal, and a timing generated by itself or in synchronization with the received synchronization signal. By having a transmission / reception switching unit that switches between transmission and reception, transmission and reception are alternately performed in synchronization with the other party of the communication, the transmission voice is A / D converted at a fixed time interval and stored, and the stored data is stored in the A A / D conversion is performed at a fixed time interval by reading out at a half time interval of D / D conversion, performing D / A conversion, adding to the modulation unit, compressing in half the time, and transmitting. Then, the stored data is read out at a time interval twice as long as the A / D conversion, D / A converted and returned to the original length, so that simultaneous transmission / reception is performed using the same frequency. I also tried It is.

As this conventional example, there is one shown in FIG.
In FIG. 3, reference numeral 1 is a microphone, 2 is an A / D conversion unit for converting transmission voice into digital data, 3 is a storage device for storing digital data, and 4 is digital data read from the storage device 3 for conversion into analog signals. The A / D conversion unit 5 includes a write / read address of the storage device 3 and A
An audio compression control unit that controls the timing of D / D conversion or D / A conversion. Reference numeral 6 is an A / D conversion unit for converting received voice into digital data, 7 is a storage device for storing digital data, 8 is a D / A conversion unit for converting digital data read from the storage device 7 into an analog signal, and 9 is Write / read address of storage device 7 and A / D conversion or D
It is a voice expansion controller that controls the timing of A / A conversion.

Reference numeral 10 is a sync signal detecting section for detecting a predetermined sync signal from the received voice, 11 is a transmission / reception switching section for switching the operation of the radio between a transmission period and a reception period, and 12 is a control from the transmission / reception switching section 11. Is a synchronizing signal generating unit for generating a synchronizing signal and outputting it to the transmitting signal modulating unit 13, 14 is a receiving signal demodulating unit, 15 is a transmitting / receiving unit, and 16 is a speaker.

Reference numeral 17 is a press switch for switching the operation of this apparatus between transmission and reception, and 18 is a switch for starting simultaneous transmission / reception in synchronization with a synchronization signal generated by itself (hereinafter referred to as a synchronization decision right acquisition switch). , 19 are switches for starting simultaneous transmission / reception in synchronization with the received synchronization signal (hereinafter, referred to as partner station dependent synchronization setting switch)
Reference numeral 20 is a switch for switching the input to the modulator 13 to either a normal transmission voice or a time-compressed transmission voice, 21 is a switch for switching the input to the speaker 16 to a normal reception voice or a time-decompression voice, 22 Is a control unit configured by using a microcomputer or the like.

The operation of the apparatus thus configured will be described with reference to FIGS. 4 and 5. FIG. 4 shows the operation when neither the synchronization decision right acquisition switch 18 nor the partner station subordinate synchronization setting switch 19 is pressed, and this mode is defined as a press talk communication mode. Figure 4
(A) shows the state of the press switch 17,
The position of "H" is in the receiving state, and the position of "L" is in the transmitting state. (B) is the output of the demodulation unit 14, (c) is the output from the speaker 16, (d) is the voice input from the microphone 1, and (e) is the input to the modulation unit 13.

When the press switch 17 is not pressed, the radio is in the receiving state, and the control unit 22 switches the switch 21.
To the a side, and the output of the demodulation unit 14 is directly output from the speaker 16. At this time, the call partner is press switch 17
If you press to send uncompressed audio,
(24-1, 24-2) The voice of the other party can be heard normally.

When the other party of the call presses the synchronization decision right acquisition switch 18 and transmits a time-compressed voice following the synchronization signal (24-4), the normal operation cannot be heard as it is. Need to

FIG. 5 shows the operation when the slave station subordinate synchronization setting switch 19 is pressed, and this state is defined as the simultaneous transmission / reception mode. FIG. 5A shows the state of the partner station dependent synchronization setting switch 19 while it is being pressed.
That is, the ON time is "L". (C) is the output of the synchronization detection unit 10, and (D) is the output signal of the transmission / reception switching unit 11. When the synchronization detecting unit 10 detects a synchronization signal from the other party, the transmission / reception switching unit 11 transmits the transmission / reception switching signal shown in FIG. 5D in synchronization with the detected synchronization signal for a half period between the synchronization signal periods. Then, the transmission / reception unit 15 is alternately switched to transmission and reception.

In FIG. 5D, "H" is a transmission period and "L" is a reception period. The control unit 22 uses the switch 2
1 is turned to the b side, and the voice received during the period of the synchronizing signal appearing in the demodulation unit 14 is compressed in half the period, and the received voice is A / D conversion unit 6, storage device 7, D / A conversion unit 8 The voice expansion control unit 9 outputs the original length, that is, the one returned to the synchronization signal period, from the speaker 16. The control unit 22 also
The switch 20 is tilted to the b side, and the A / D conversion unit 2, the storage device 3, the D / A conversion unit 4, and the audio compression control unit 5 compress the signal during the synchronization signal period to half the time of the synchronization signal period. The generated transmission voice is input to the modulator 13 and transmitted during the period determined as the transmission period by the transmission / reception switching unit 11.

[0011]

However, in such a conventional apparatus, an operator manually switches between the press talk communication mode and the simultaneous transmission / reception mode of the receiving side radio device, so that when an operator receives an incoming call. When the operation modes of the calling side and the receiving side are different from each other, there is a problem that the operation modes cannot be promptly matched and the call from the other party cannot be heard until the operation modes match.

The present invention has been made in view of the above circumstances, and is intended to quickly switch the operation mode of a radio device on the receiving side without annoying the operator's hand.

[0013]

In order to solve such a problem, the present invention is provided with a switching unit for switching between press talk communication and simultaneous transmission / reception communication depending on the presence / absence of synchronization signal detection.

[0014]

In the radio device on the receiving side, instead of the operator switching between the press talk call mode and the simultaneous transmission / reception mode, the output of the sync signal detection unit 10 is input to the control unit constituted by a microcomputer or the like to detect the sync. The control unit 22a switches between the press talk call mode and the simultaneous transmission / reception mode depending on the presence / absence.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of the present invention. The operation when the synchronization decision right acquisition switch 18 is not pressed and the synchronization signal from the other party is not detected is the conventional operation. Since the control unit 22a tilts the switches 20 and 21 to the side a, the output of the demodulation unit 14 is directly output from the speaker 16 and the press switch 1
When the user presses 7, the output of the microphone 1 is directly input to the modulator 13 for transmission.

Next, the operation when the sync detector 10 detects a sync signal from the other party will be described with reference to FIG. 2A shows the output of the demodulation unit 14, FIG. 2D shows the output from the speaker 16, FIG. 2E shows the voice input from the microphone 1, FIG. 2F shows the input signal to the modulation unit 13, and FIG. This is a synchronization signal output from the detection unit 10.

When the sync signal from the sync detector 10 is detected, for example, twice or more consecutively, the controller 22a turns on the operation of the transmission / reception switching unit 11. The transmission / reception switching unit 11 outputs a transmission / reception switching signal that is "H" for half the period of the synchronization signal and "L" for the other half as shown in FIG. The unit 15 is switched between transmission and reception. In FIG. 2C, the period “H” is the transmission period and the period “L” is the reception period.

The control unit 22a also turns the switch 21 to the b side, and the received voice shown in (a) compressed to half the period of the synchronizing signal output from the demodulating unit 14 following the synchronizing signal is A / The D conversion unit 6, the storage device 7, the D / A conversion conversion unit 8, and the voice expansion control unit 9 restore the original length and output from the speaker 16. Also, the switch 20 is tilted to the b side to modulate the transmission voice compressed by the A / D conversion unit 2, the storage unit 3, the D / A conversion unit 4, and the voice compression control unit 5 in a time half the synchronizing signal cycle. It is input to the unit 13 and transmitted during the transmission period. As a result, the simultaneous transmission / reception mode is set.

When the detection of the sync signal from the other party is cut off, the control unit 22a turns off the operation of the transmission / reception switching unit 11, and thereafter the switching between transmission and reception is made to follow the press switch 17. The control unit 22a also turns the switch 21 to the a side, and the output of the demodulation unit 14 is directly output from the speaker 16. The control unit 22 also tilts the switch 20 to the a side, and the transmission sound from the microphone 1 is directly input to the modulation unit 13.
This returns to the press talk call mode.

[0020]

As described above, according to the present invention, the press talk communication mode and the simultaneous transmission / reception communication mode are switched depending on the presence / absence of the detection of the sync signal. Therefore, the press talk communication or the simultaneous transmission / reception mode can be performed without the operator's operation. It has the effect that can be selected.

[Brief description of drawings]

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

2 is a timing diagram showing the operation of the apparatus of FIG.

FIG. 3 is a block diagram showing an example of a conventional device.

4 is a timing diagram showing the operation of the apparatus of FIG.

5 is a timing diagram showing the operation of the apparatus of FIG.

[Explanation of symbols]

 1 Microphone 2,6 A / D conversion section 3,7 Storage device 4,8 D / A conversion section 5 Compression control section 9 Expansion control section 10 Sync detection section 11 Transmission / reception switching section 12 Sync generation section 13 Modulation section 14 Demodulation section 15 Transmitter / receiver 16 Speaker 17 Press switch 18 Synchronization decision right acquisition switch 19 Opposite station dependent synchronization switch 20, 21 Switch 22, 22a Control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Suzuka 32 Miyuki-cho, Kodaira-shi, Tokyo Inside Koganei factory, Hitachi Electronics Co., Ltd. (72) Mitsuo Shiraishi 32 Miyuki-cho, Kodaira-shi, Tokyo Koganei factory, Hitachi Electronics Co., Ltd. (72) Inventor Ohira, 7-2 Nakayama, Aoba-ku, Sendai-shi, Miyagi Prefecture, Tohoku Electric Power Co., Inc. Applied Technology Research Laboratory (72) Inventor Kiyojun Izawa, 7-2, Nakayama, Aoba-ku, Sendai, Miyagi Prefecture Tohoku Power Technology Co., Ltd. Applied Technology Laboratory (72) Inventor Fujio Kaku 39-10 Kitamine, Ota-ku, Tokyo Fujitec Co., Ltd. (72) Inventor Kenichi Suzuki 39-10 Kitamine-cho, Ota-ku, Tokyo Fujitec Co., Ltd. Within

Claims (1)

[Claims] 1. A certain period of a synchronizing signal period is allocated to transmission, a voice signal in the synchronizing signal period is compressed and transmitted during the allocated transmission period, and the remaining period is allocated to reception and a reception output signal is expanded. In the simplex / duplex switching radio that performs simultaneous transmission / reception communication on the same frequency, it is equipped with a switching unit that switches between presstalk communication and simultaneous transmission / reception communication depending on the presence or absence of synchronization signal detection. Duplex switching radio.