JP3175287B2 - Press talk wireless device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a radio apparatus of a press-talk system having a self-diagnosis function capable of detecting an abnormality.

[0002]

2. Description of the Related Art Conventionally, as a press-talk type radio apparatus having a self-diagnosis function, there is an analog transmission radio apparatus filed by the present applicant in Japanese Patent Application No. 3-308119 on November 25, 1991. This will be described below as a conventional example.

FIG. 3 is a block diagram of a conventional radio apparatus of the press talk system. In FIG. 3, the transmission system includes a baseband unit 11, a modulation unit 12, a frequency conversion unit 13, and a radio frequency unit 14. When an audio signal from the microphone 15 is input, the signal is modulated and transmitted as a radio frequency signal.

[0004] The receiving system has a radio frequency section 24, a frequency conversion section 23, a demodulation section 22, and a baseband section 21, and extracts an audio signal from a received radio wave. Reference numeral 31 denotes a transmission / reception changeover switch which switches between transmission and reception by a caller's press-talk operation. Reference numeral 32 denotes a local oscillator which supplies a local oscillation signal having the same frequency to the frequency conversion units 13 and 23 of the transmission system and reception system. Reference numerals 44 denote switches for looping back. The switches are manually turned on one by one from the baseband unit 11 side, and the output of each unit of the transmission system is turned back to the corresponding unit of the reception system.

[0005] Reference numerals 45 to 48 denote attenuators for adjusting the output level of each unit of the transmission system and adjusting the level of each unit of the corresponding reception system to the specified level of the level diagram.

Reference numeral 46 denotes a test signal generator which outputs a sine wave of a single frequency, for example, a signal of 1 KHz in the audio frequency band. Reference numerals 55a and 55b denote test changeover switches, which are manually switched as shown in the drawing to make a loop test state. Reference numeral 5 denotes an amplitude / phase adjustment unit, and an amplitude adjustment circuit 5
1, an amplitude comparison circuit 52 and a phase adjustment circuit 53 for adjusting the phase by the output of the comparator 61. When a 1 KHz sine wave close to the specified level of the level diagram is output from the output of the baseband unit 21, a test signal is generated. Although the level and phase can be matched with the 1KHz sine wave output from the unit 46, when the loopback path is abnormal and a signal of 1KHz or other frequency at a level much lower than the specified level is output, The level and phase cannot be matched with the 1 KHz sine wave output from the test signal generator 46.

Reference numeral 61 denotes a comparator.
6 and the 1 KHz signal output from the
Is compared with the signal adjusted in step (1), and outputs 0 when the levels and phases match, and outputs a residual signal when the levels and phases are different. 62 is a judgment circuit, and the output amplitude of the comparator 61 is about the noise level. If the amplitude is smaller than the small amplitude threshold value Vth, a normal 0 is output, and if it is larger, an abnormal 1 is output.

Therefore, when the self-diagnosis is performed, the operation of the wireless device is stopped and the test changeover switches 55a and 55b are switched to the test side.
Is transmitted to the baseband unit 11 at a specified level, and the output of the baseband unit 21 is output to the test unit side.

Next, the switch 41 for loopback is turned on so that the baseband signal is looped back from the transmitting side to the receiving side. If the baseband units 11 and 21 operate normally, the output signal from the baseband unit 21 becomes a sine wave signal of 1 KHz of a specified level, and the judgment circuit 6
In 2, a normal 0 is output, and if an abnormality has occurred in the baseband units 11 and 21, the output signal from the baseband unit 21 is a signal of 1 KHz or another frequency at a level much lower than the specified level. Since the amplitude / phase adjustment unit 5 is out of the adjustment range and the residual signal exceeds the threshold value Vth, the determination circuit 62 outputs 1 indicating an abnormality.

Next, a switch 4 for loop back
When 2, 43 and 44 are sequentially turned on to form a return loop, the same operation as described above is performed, and the determination circuit 62 outputs 0 when normal and 1 when abnormal.

In this way, it is possible to self-diagnose whether each part is normal or abnormal.

[0012]

However, in the conventional press-talk type radio apparatus, when performing self-diagnosis, the operation of the radio apparatus is stopped and the switch is manually operated. In addition, there is a problem that it takes time.

According to the present invention, a self-diagnosis can be automatically performed during operation, and if the self-diagnosis result is abnormal, a failure site
Presto to identify the
It is intended to provide a wireless device of a wireless communication method.

[0014]

FIG. 1 is a block diagram showing the principle of the present invention. As shown in FIG. 1, the outputs of the transmission system baseband unit 11, modulation unit 12, frequency conversion unit 13, and radio frequency unit 14 are output to the reception system baseband unit 21, demodulation unit 22, frequency conversion unit 23, Wraps back to each input of radio frequency section 24
Press-talk radio with multiple loopback paths
In the device, the press talk signal and the reception of the demodulation unit 22
Detected standby state where no call was made from state
The standby state detection to start the operation of the self-diagnosis control means 2
Output means 1 and an operation start signal from the standby state detecting means 1.
Establishes one of multiple loopback routes
Normal and abnormal determination means when establishing a loopback route
(3) the self-diagnosis control means 2 to be operated, and the self-diagnosis control means
According to the operation command from stage 2, any of the loopback paths
One of the routes is established, and
The test signal is input from the input of the
The signal passes through the back path to the baseband section 21 of the receiving system.
Determine whether the test signal to be applied is normal or abnormal,
The judgment result is that at least one loopback route
Becomes abnormal or all loopback routes are determined.
Until another loopback is established and the test is performed.
Normal abnormality judging means 3 for judging the normal abnormality of each route
Comprising, the baseband unit in the wireless device, a modem unit,
The normality / abnormality is determined for each of the frequency conversion unit and the radio frequency unit.

[0015]

According to the present invention, upon detecting a standby state in which the call from the reception state of the press-talk signal and the demodulation section 22 is not performed, to initiate the operation of the self-diagnosis control unit 2, double
Establish one of several loopback paths, and
When the loopback route is established, the normal / abnormal
Test signal from the input of the baseband unit 11 of the transmission system.
To the receiving system through the selected loopback path.
The test signal output to the baseband unit 21 is normal or abnormal.
Is normal, and if the result of the
One loopback path or all loops
Until the determination of the back route is completed, the other loop back
Network, conduct tests, and determine whether each route is normal or abnormal.
By doing so, it is possible to determine whether the wireless device is normal or abnormal, and
If it is determined to be abnormal, the faulty part in the wireless device can be specified.
It becomes possible.

That is, when a standby state is detected during operation,
Because automatically performs a self-diagnosis, can be done without stopping the operation, the self-diagnosis takes the hassle, and, self-diagnosis result
If the device is abnormal, identify the faulty part of the device and
Recovery can be done quickly .

[0017]

FIG. 2 is a block diagram of a press-talk type radio apparatus according to an embodiment of the present invention. In FIG. 2, the audio signal from the microphone 15 is transmitted to the switch SW2 and the baseband unit 1.
1, a switch SW3, a modulation unit 12, a switch SW4, a frequency conversion unit 13, a switch SW5, a radio frequency unit 14, and a modulated radio frequency signal.
Output through W6 and SW1.

The radio frequency signal received through the switch SW1 passes through the radio frequency section 24, the frequency conversion section 23, the demodulation section 22, and the baseband section 21, is converted into an audio signal, and is output to the speaker 25 through the switch SW7. You.

SW1 is a switch for connecting to the transmission side or the reception side by a press talk signal.
Reference numeral 48 denotes an attenuator, which controls the output level of each unit in the transmission system.
This is for adjusting to the specified level of the level diagram of each unit of the corresponding receiving system.

SW3 to SW6 are switches for establishing a loopback path, and SW2 and SW7 are switches on the time line side where the switches SW3, SW4, SW5 and SW6 are on the dotted line side for self-diagnosis. , 32 is a local oscillator, and 26 is a squelch.

Reference numeral 70 denotes an oscillator for outputting a sine wave of 100 KHz. Reference numeral 71 denotes a frequency divider for reducing the frequency to 1/100.
Output at a specified level on the level diagram with a sine wave of z,
This is an input signal for performing a self-diagnosis test.

Reference numeral 74 denotes a level adjuster.
A level difference obtained by comparing the level of the output of the frequency divider 71 with the 1 KHz sine wave and the output of the baseband unit 21 is input, and the output of the baseband unit 21 is a predetermined level of the 1 KHz sine wave. In the case of a wave, the level can be adjusted to the same level. For example, an abnormality occurs in the loopback path, and the output of the baseband unit 21 is 1 KH, which is much lower than a predetermined level.
Even if a signal of z or another frequency is input to the level comparator 75 and a difference signal is output, it cannot be adjusted.

Reference numeral 73 denotes a phase converter which changes the phase of the input 1KHz sine wave by, for example, 0 ^{0 to} 360 ⁰ within 0.1 second. Reference numeral 72 denotes a differential amplifier which outputs the output of the frequency divider 71. 1KHz sine wave, and outputs a 0 when matched comparing the amplitude and phase of the output of the phase 0 ^{0-360 0} altered 1KHz sine wave of the phase converter 73.

Numeral 77 denotes a variable frequency divider. In order to perform a self-diagnosis, each time one of the switches SW3, SW4, SW5, SW6 is sequentially set to the dotted line side, the frequency dividing ratio is 1/200, 1/10.
1 KHz to be input as 0, 1/50, 1/33 is 50
The signals are output as signals of 0 Hz, 1000 Hz, 2000 Hz, and 3000 Hz.

[0025] 76 0 at determiner, changing the phase of the sine wave of 1KHz to phase converter 73 inputs ⁰ 0-360 ^0.
If a signal of 0 is not input within one second, it is determined that there is an abnormality, and the switch SW8 is set to the dotted line side.

When the squelch 26 of the demodulation unit 22 is closed, the standby detection unit 1-1 operates the timer 1-2 and waits for, for example, 10 seconds. Then, the self-diagnosis control unit 2 is operated by determining that the call is over and the standby state is established.

The self-diagnosis control unit 2 includes switches SW3, S
A signal for setting W4, SW5, and SW6 to the dotted line side is sequentially output, for example, every two seconds, and this signal is output to switches SW2 and SW6.
7, the switches SW2 and SW7 are set to the dotted line side, and also sent to the variable frequency divider 77, and the output of the variable frequency divider 77 is set to 500 Hz, 1000 Hz, 2000 Hz, and 3000 for 2 seconds.
Hz signal.

The switches SW2, SW3, and SW7 are on the dotted line side, and a 1 KHz sine wave of a predetermined level of the level diagram output from the frequency divider 71 is input to the baseband unit 11, and the attenuator 45, baseband When the signal passes through the section 21 and is input to the level comparator 75 and the level adjuster 74, the level adjuster 74 adjusts the output level of the frequency divider 71, and inputs the output to the phase converter 73 to change the phase from 0 ^{0 to} 360 ^0. And
Input to the differential amplifier 72. Then, the output of the frequency divider 71 is compared with the amplitude and the phase, and when the amplitude and the phase match, a signal of 0 is sent to the determiner 76.

When the loopback path is normal, the amplitude and phase always match and a signal of 0 is input to the decision unit 76 within 0.1 seconds after the loopback state. Is not output, and when the loopback path is abnormal, the level of the signal input to the level comparator 75 and the level adjuster 74 is 1K, which is much smaller than the predetermined level.
Hz or another frequency, the level adjuster 7
4, the output level of the frequency divider 71 cannot be made the same, so that a signal of 0 is not output from the differential amplifier 72 within 0.1 seconds, and the decision unit 76 has an abnormal state in the loopback path. Is generated, the switch SW8 is set to the dotted line side for about two seconds, and a signal of 500 Hz is sent to the speaker 25 to notify the abnormality.

The switches SW4, SW5, and SW6 are sequentially set to 2.5
Seconds interval, a dotted line side with the switch SW2, SW7, performs the above description as well as normal or abnormal judgment, when the abnormality outputs the signals of different frequencies for each loop-back path established from the speaker 25, which An error occurred in the loopback route
To determine the failure site of the wireless device.
Can be. In the present embodiment, the first, second, third, fourth plural
Which loopback route to select from the loopback route
About the second, third, and fourth routes sequentially from the first route
Although the example of selecting is shown, the present invention defines the selection of the ranking.
Not something.

During the self-diagnosis, there is reception and the demodulation unit 2
When the squelch 26 of No. 2 is opened, the standby detection unit 1-1 is not in the standby state, and the self-diagnosis operation in the self-diagnosis control unit 1-2 is stopped.

Here, an oscillator 70, a frequency divider 71, a differential amplifier 72, a phase converter 73, a level adjuster 74, a level comparator 75, a determiner 76, a variable frequency divider 77, a switch S
W2, SW7 and SW8 correspond to the normal / abnormal judgment means 3.

[0033]

As described in detail above, according to the present invention, self-diagnosis is performed automatically during operation, so that self-diagnosis can be performed without any trouble without stopping operation, and diagnosis can be performed.
If the result is abnormal, we can take action for quick recovery.
You.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention;

FIG. 2 is a block diagram of a press-talk wireless device according to an embodiment of the present invention;

FIG. 3 is a block diagram of a conventional press-talk wireless device.

[Explanation of symbols]

1 is a standby state detecting means, 1-1 is a standby detecting section, 1-2 is a timer, 2 is a self-diagnosis control section, a self-diagnosis control section, 3 is a normal / abnormal judgment section, 5 is an amplitude / phase adjusting section, 11,21
Is a baseband unit, 12 is a modulation unit, 13 and 23 are frequency conversion units, 14 and 24 are radio frequency units, 15 is a microphone, 2
2, demodulation unit, 25, speaker, 26, squelch, 31,
41 to 44, 55a, 55b, SW1 to SW8 are switches, 32 is a local oscillator, 45 to 48 are attenuators, 46 is a test signal generator, 51 is an amplitude / adjustment circuit, 52 is a level comparison circuit, and 53 is phase adjustment. Circuit, 61 is a comparator, 6
2 is a decision circuit, 70 is an oscillator, 71 is a frequency divider, 72 is a differential amplifier, 73 is a phase converter, 74 is a bell adjuster, 75
Denotes a level comparator, 76 denotes a decision unit, and 77 denotes a variable frequency divider.

Claims (1)

(57) [Claims] 1. A transmission system comprising a baseband unit 11, a modulation unit 12,
A press talk having a plurality of loopback paths that returns the outputs of the frequency conversion unit 13 and the radio frequency unit 14 to the respective inputs of the baseband unit 21, demodulation unit 22, frequency conversion unit 23, and radio frequency unit 24 of the receiving system. In the wireless device of the system, a call is made based on the reception state of the
Self-diagnosis control when a standby state that is not performed is detected
A standby state detecting means 1 for starting the operation of the means 2;
Multiple loop bars are received by the operation start signal from status detection means 1.
One of the backup routes and establish a loopback
The self-diagnosis that activates the normal / abnormal judgment means 3 when the lock is established
The loop control unit 2 and the self-diagnosis control unit 2
Establish any one of the back paths and send
A test signal is input from the input of the baseband unit 11 of the system,
The test signal output to the baseband section of the receiving system is correct.
Is determined to be normal or abnormal, and the result of the determination is small.
If at least one loopback path becomes abnormal,
Until the determination of all loopback routes is completed,
Normal-abnormality judgment procedure to establish loopback
Press talk type radio characterized by having stage 3
apparatus