JPH0510432Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a wireless communication device used in an automatic vehicle position display system, etc.

(Prior Art) FIG. 2 shows an outline of an automatic vehicle monitoring system (hereinafter referred to as AVM system). In the figure, 1 is a base station radio, 2 is an AVM main device, and these constitute a base station (vehicle dispatch center) A. Further, 3 is a radio device of the mobile station, 4 is an additional device, and these are mounted on the vehicle, and the mobile station B1
~ Configure Bn.

When the transmission path between base station A and mobile stations B1, B2 to Bn is configured using a simplex method, when one of the mobile stations, for example mobile station B1, performs data communication or voice communication, the base station Station A and other mobile stations B2 to Bn are simultaneously received.

FIG. 3 shows the configuration of a conventional mobile station. Base station A
A radio signal transmitted from another mobile station is received by the antenna 31 and the transmitting/receiving circuit 32 of the radio device 3, detected by the detector 33, and demodulated into a data signal or an audio signal. The demodulated signal is sent to the additional device 4 side via the changeover switch 34, reproduced by the speaker (SP) 41 of the additional device 4, and simultaneously sent to the modem 42. If it is a data signal, it is further demodulated and sent to the microprocessor. Setsa (CPU) 43
and stored in the memory 44 as necessary.

On the other hand, when communicating from one mobile station, for example, voice communication, the press talk button 51 of the microphone 5 is pressed and an audio signal is input to the microphone element 52.

The microprocessor 43 receives the signal from the press talk button 51 and sends a press talk (hereinafter referred to as PT) signal to the radio 3 to start up the radio 3, and also starts up the radio 3. Based on the program, a data signal in a predetermined format containing the mobile station's individual (vehicle) number, location information, etc. is created and sent to the radio 3 via the modem 42. After this, the audio signal is also sent to the radio 3.

In the radio device 3, the data signal and the audio signal are modulated by a modulation circuit 35, multiplied to a predetermined frequency by a multiplier circuit 36, and transmitted to a transmitting/receiving circuit 32 and an antenna 3.
Send from 1.

When sending only data, enter the data to be sent from the keyboard 45 of the additional device 4, press the send button (not shown), and the microprocessor 43 sends a PT signal to the radio 3 as described above. When the radio device 3 is turned on, a data signal in a predetermined format is created based on the input data, sent to the radio device 3 via the modem 42, and transmitted from the radio device 3.

FIG. 4 shows the situation of the signal when one mobile station transmits.The transmitting mobile station, for example, mobile station B1, sends a data signal 62 for a certain period of time (for example, 100 to 200 msec) with a slight delay from the PT signal 61. send out,
Furthermore, an audio signal 63 is transmitted.

The transmitted signals are all received by the other mobile stations B2 to Bn, but at this time, the data signal 64 and audio signal 65 corresponding to the data signal 62 and audio signal 63 are transmitted to the speaker of the additional device 4. It will be played on 41. At this time, the data signal 64 is reproduced as a sound (hereinafter referred to as data sound) that is quite different from a normal audio signal, such as "pilo-piro".

Similarly, even when any one of the mobile stations B2 to Bn performs communication, the data sound will be reproduced at the other mobile stations.

(Problem to be solved by the invention) In this conventional configuration, when a certain mobile station transmits only a data signal or a data signal and an audio signal, other mobile stations transmit data that is audibly unpleasant. There was a problem with the sound being played.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication device that eliminates the above-mentioned problems and does not reproduce only data sounds.

(Means for solving the problem) In order to solve the above problem, the present invention transmits a wireless signal consisting of a data signal over a preset period of time and an audio signal following the data signal using a predetermined carrier wave. A wireless communication device that modulates and communicates detects reception of the carrier wave, and during the reception period,
a carrier wave detection means that outputs a predetermined signal or stops outputting the predetermined signal, and from the time when the predetermined signal is output or the output of the predetermined signal is stopped until approximately the predetermined time has elapsed; , a sound reproduction means for demodulating and reproducing the received radio signal, and a blocking means for blocking input of the radio signal to the audio reproduction means while the time measurement means is in operation. .

(Function) According to the present invention, when a carrier wave is detected by the carrier wave detection means after receiving communication from another wireless communication device, a predetermined signal is output or the output of the predetermined signal is stopped. The timer then starts counting for a predetermined period of time, during which time the input of the wireless signal to the audio reproducing means is blocked by the blocking means, and as a result, no data sound is reproduced.

(Embodiment) FIG. 1 shows an embodiment of the present invention, and in the figure, the same components as in the conventional example are denoted by the same reference numerals. That is, 31 is an antenna, 32 is a transmitting/receiving circuit, 33a is a detector, 34 is a changeover switch, and 35
3 is a modulation circuit, and 36 is a multiplier circuit, which constitute the radio device 3a. Also, 41 is a speaker, 4
2 is a modem, 43a is a microprocessor (CPU), 44 is a memory, 45 is a keyboard, 4
6 is a switch, which constitutes an additional device 4a. Also, 51 is a press talk button, 52
is a microphone element, and these are microphone 5
Configure.

The detector 33a incorporates a well-known squelch circuit (not shown) and sends a signal indicating the operation of the squelch circuit (hereinafter referred to as an SQ signal) to the microprocessor 43a of the additional device 4. Further, the switch 46 is connected between the speaker 41 and a terminal that receives the demodulated signal from the radio device 3a.

The microprocessor 43a controls the switch 46 according to the procedure shown in the flowchart of FIG. That is, the SQ signal is constantly monitored, the switch 46 is turned off for a predetermined time T (for example, 250 to 300 msec) from the time when the SQ signal disappears, that is, the squelch circuit is released, and then the SQ signal is turned off. The switch 46 is controlled to be turned on until it is output again. Note that other controls are the same as in the past.

Here, the squelch circuit in the detector 33a constitutes a carrier wave detection means in the scope of the utility model registration claims, and the measurement of the predetermined time T by the microprocessor 43a constitutes the timekeeping means in the scope of the utility model registration claims. In addition, the detector 33a and the speaker 41 constitute audio reproduction means within the scope of the utility model registration claim, and the switch 46
The on/off control by the microprocessor 43a constitutes the shutoff means in the scope of the utility model registration claims.

Next, the operation will be explained. A radio signal transmitted from another (originating) mobile station is received by the antenna 31 and transmitting/receiving circuit 32 of the radio 3a, detected by the detector 33a, and demodulated into a data signal or audio signal. The demodulated signal is transferred to the changeover switch 34
is sent to the additional device 4a side via the switch 4a.
6 and simultaneously sent to the modem 42. If it is a data signal, it is further demodulated, processed by a microprocessor (CPU) 43a, and stored in a memory 44 as necessary.

At this time, the squelch circuit in the wave detector 33a detects the carrier wave in the received signal, the squelch operation is turned off, and the SQ signal is also turned off.

When the SQ signal is turned off, the microprocessor 43a measures the predetermined time T by, for example, counting clock pulses of a constant period with a built-in counter, and the count value j counts a predetermined number n,
During that time, if the SQ signal continues to be off, switch 46 is turned on.

When the switch 46 is turned on, the demodulated signal is outputted from the radio device 3a side through the switch 46 to the speaker (SP) 41 and reproduced. Further, after that, when the received signal ends, the squelch operation is turned on, and the SQ signal is also turned on, the microprocessor 43a turns off the switch 46 and thereafter cuts off the speaker 41.

Therefore, of the signal transmitted from the originating mobile station, the data signal portion is not output to the speaker 41, the data sound is not reproduced, and only the audio signal is reproduced. Note that the same applies even when only a data signal is transmitted from the originating mobile station, and the data sound is not reproduced.

FIG. 6 shows the signal situation at the originating mobile station and the main mobile station. When a signal from the oscillator mobile station is received, the mobile station performs squelch operation.
That is, the SQ signal 66 is turned off, and after a predetermined time T has passed, the switch 46 is turned on 67, and the audio signal 68 corresponding to the audio signal 63 of the originating mobile station is turned off.
only is output.

Note that the predetermined time T is set to an appropriate value depending on the format of the data signal.

(Effect of the invention) As explained above, according to the invention, since the wireless signal is not input to the audio reproduction means for a certain period of time from the time when the carrier wave of the wireless signal is detected, other wireless communication devices It has the advantage of being able to remove unnecessary data sounds from the computer and eliminating auditory discomfort.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure shows an overview of the AVM system, Figure 3 is a configuration diagram of a conventional device, Figure 4 is an operation time chart of the device in Figure 3, Figure 5 is a flowchart of switch control, and Figure 6 is a diagram of a conventional device. This is an operation time chart of the device shown in the figure. 3a...Radio device, 4a...Additional device, 33a...
...Detector, 41...Speaker, 43a...Microprocessor, 46...Switch.

Claims (1)

[Claims for Utility Model Registration] A wireless communication device that modulates and communicates a wireless signal consisting of a data signal over a predetermined period of time and an audio signal following the data signal using a predetermined carrier wave, carrier wave detection means that detects reception and outputs a predetermined signal or stops outputting the predetermined signal during the reception period; and from the time when the predetermined signal is output or the output of the predetermined signal is stopped. , a timer for measuring time until approximately the predetermined time has elapsed; an audio reproducing means for demodulating and reproducing the received radio signal; and inputting a wireless signal to the audio reproducing means while the timer is operating. A wireless communication device characterized by comprising: a blocking means for blocking.