JP2632857B2 - Special mode starter for radio - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a special mode starting device for a radio, and
The present invention relates to an apparatus for activating a special mode of a radio having a tone squelch circuit.

[Conventional technology]

Conventionally, for example, allocation of frequencies (channels) in business radio is performed by a public organization or a licensed organization (eg, coordinator) or the like using a plurality of channels in a business radio frequency band (eg, 150 MHz band or 400 MHz band). Are selected and assigned to individual users. When these organizations receive frequency assignments for users,
In the case of a PLL synthesizer type radio, the dealer or the like determines the available frequency (approved frequency) corresponding to the channel selected for the storage element (ROM, EPROM, EEPROM, battery-backed RAM), etc. of the radio. ) Is written.

In addition, recent commercial radios not only make available frequencies different from user to user as the number of users increases, but also provide a tone squelch circuit in the radio and provide a tone signal (for example, 38 waves of 67 Hz to 250.3 Hz). ), A user who uses the same frequency can talk without interference if the tone signal is different.

By the way, the frequency writing work by a store or the like is performed, for example, by writing a usable frequency to an EPROM or the like using a dedicated ROM writer and inserting the EPROM or the like into a wireless device, and assigning the wireless device by a coordinator or the like. It can be used at the specified frequency.

Further, as another method of frequency writing work by a store or the like, for example, a switch for setting a frequency is provided inside the wireless device and the frequency setting switch is operated, or an operation key is operated in a specific sequence. By operating the wireless device, the wireless device is set to the frequency setting mode, and the usable frequency is written into an EEPROM, a battery-backed RAM, or the like provided in the wireless device.

[Problems to be solved by the invention]

As described above, for example, in a commercial radio, a coordinator or the like assigns a frequency, but setting of this frequency to a radio is performed by writing an available frequency to a storage element or the like of the radio. Is being done.

Specifically, dealers use the dedicated ROM writer to
The available frequency is written in the OM or the like, and the assigned frequency is set by inserting the EPROM or the like into the wireless device. This frequency assignment work is preferable because the dedicated ROM writer is used, so that the management of the actual product is easy and the general user does not write the usable frequency without permission. However, since a dedicated ROM writer for writing usable frequencies to an EPROM or the like is expensive, arranging a dedicated ROM writer at all of the dealer levels places a heavy burden.

In addition, the store or the like operates the frequency setting switch inside the radio, or operates the operation keys in a certain sequence to set the radio to the frequency setting mode, and
The frequency is set by writing the usable frequency to an EEPROM provided in the wireless device or a RAM backed up by a battery. This frequency setting work is a special
This is advantageous in terms of cost and workability because all the frequency assignment work can be performed by the radio itself without the need for a ROM writer. However, operation of the frequency setting switch inside the radio,
Alternatively, if information such as a specific sequence operation of the operation key is leaked to the user, anyone can easily write the usable frequency, so that the general user can write the usable frequency without permission. turn into.

An object of the present invention is to solve the above-described problems of the above-described conventional special mode activation device for a wireless device. Therefore, a general user cannot activate the special mode without permission, and moreover, a store or the like requires expensive dedicated equipment. It is an object of the present invention to provide a special mode starting device for a wireless device, which can easily start a special mode and perform a predetermined operation without using the same.

[Means for solving the problem]

FIG. 1 is a block diagram showing the principle of a special mode starting device for a wireless device according to the present invention.

According to the present invention, when a tone signal having a predetermined frequency included in a radio wave is not detected, the wireless communication is cut off, and when the tone signal is detected, the cutoff of the wireless communication is released, and the same frequency is cut off. In a special mode starting device for a radio, which comprises a tone squelch circuit 1 for preventing radio communication interference in the above, and activates a special mode enabling a communication function in the radio to be specially changed, the tone squelch circuit 1 For a special mode for determining whether or not the frequency of the tone signal is outside the frequency band including a plurality of frequencies used for normal tone squelch and is a special mode tone signal having a frequency not normally used for the tone squelch. The frequency of the tone signal detected by the tone determining means 2 and the tone signal detected by the tone squelch circuit 1 Come, a special mode activation device radios equipped with special mode activation means 3 to start the special mode, the is provided.

(Operation)

According to the special mode starting device for a wireless device of the present invention having the above configuration, the frequency of the tone signal detected by the tone squelch circuit 1 by the special mode tone discriminating means 2 is out of the range of the frequency used for normal tone squelch. It is determined whether the tone signal is a special mode tone signal. If the frequency of the tone signal detected by the tone squelch circuit 1 is a special mode tone, the special mode starting means 3 starts the special mode.

Here, when the tone squelch circuit does not detect a tone signal having a predetermined frequency included in the radio wave, the radio communication is cut off, and when the tone signal is detected, the cutoff of the radio communication is released, and It is used to prevent radio communication interference in frequency. The special mode tone signal is a tone signal having a frequency outside the frequency band including a plurality of frequencies used for normal tone squelch and not normally used for the tone squelch.

As described above, the store or the like can easily start the special mode and perform the predetermined operation without using expensive dedicated equipment and the like.

〔Example〕

Hereinafter, an embodiment of a special mode starting device for a wireless device according to the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing a wireless device to which an embodiment of the special mode starting device for a wireless device according to the present invention is applied, and shows a receiving system of the wireless device 4.

The radio wave caught by the antenna 5 is received and demodulated by the high frequency circuit 41 and the FM demodulation circuit 42. The output of the FM demodulation circuit 42 is supplied to the tone squelch decoder circuit 1 and the mute circuit 43. The output of the tone squelch decoder 1 is supplied to the microprocessor 47. Releases the operation and sets the FM demodulation circuit 42
Is output to the audio amplification circuit 44. As described above, when the received tone signal matches the set tone signal, the output of the FM demodulation circuit 42 passes directly through the mute circuit 43, is supplied to the audio amplification circuit 44, and is amplified by the audio amplification circuit 44. Audio signal is a speaker
It is made to be output from 45. Here, when the received tone signal does not match the set tone signal, the operation of the mute circuit 43 is continued and the FM demodulation circuit
The output of 42 is muted by the mute circuit 43 and is not supplied to the audio amplification circuit 44.

By the way, when the tone signal received and demodulated by the high frequency circuit 41 and the FM demodulation circuit 42 is a special mode tone signal (for example, 55 Hz) outside the frequency range (for example, 67 Hz to 250.3 Hz) used for normal tone squelch. , To which the output of the tone squelch decoder 1 is supplied, determines that the received tone signal is a special mode tone signal, and activates the special mode (frequency setting mode). Then, the usable frequency is written into the EEPROM 48 using the display unit 46 and the operation unit 49 of the wireless device 4. Here, the display unit 46 and the operation unit 49 select a channel to be used from the channels set in the radio 4 or automatically select a channel to which radio waves are transmitted from the channels set in the radio. The display and operation for performing a scan or the like to be selected are performed. The special mode tone signal may be outside the range of the frequency used for normal tone squelch. .

FIG. 3 is a schematic diagram showing a state where a frequency setting operation is being performed by a wireless device to which the present invention is applied. As shown in the figure, when setting the frequency of the radio 4, the antenna terminal 40 of the radio 4 and the antenna terminal 60 of the standard signal generator 6 are connected by a coaxial cable 6b. The modulation input terminal 61 and the tone output terminal of the tone signal generator 7 are connected by a cable 6a. And
The tone signal of the tone frequency (for example, 55 Hz) for the special mode generated by the tone signal generator 7 is modulated (for example, FM modulated) on the high frequency signal generated by the standard signal generator 6 and put thereon. To send to. The standard signal generator 6 and the tone signal generator 7 are usually used for inspection of the radio device 4 and the like, and are generally owned by a store for setting the frequency.

The above-described standard signal generator 6 and tone signal generator 7
With the special mode tone frequency 55Hz tone signal
When the FM-modulated high-frequency signal is transmitted to the wireless device 4, the wireless device 4 detects the special mode tone signal and activates the frequency setting mode. When the frequency setting mode is started, the usable frequency is written into the EEPROM by the display unit 46 and the operation unit 49, for example. The operation of writing the usable frequency into the EEPROM is performed using the display unit 46 and the operation unit 49 of the wireless device 4.

The display unit 46 displays the number or frequency of a channel to be used from among a plurality of channels set in the radio, and the operation unit 49 displays the channel to be used from among the channels set in the radio. This is for performing a scan or the like for selecting or automatically selecting a channel on which a radio wave is transmitted from channels set in the wireless device. Specifically, the display unit 46 is configured by an LCD or the like, and is capable of displaying several digits, alphabets, and the like. The operation unit 49 is provided with a power switch / volume knob 49a, a squelch knob 49b, up / down keys 49c and 49d for selecting channels, a scan key 49e, and the like. EE is set to EE.
It is written to PROM.

Here, the writing operation of the usable frequency to the wireless device 4 is performed by changing the frequency generated by the standard signal generator 6 to the already written usable frequency when rewriting the already written usable frequency. Match. When a new usable frequency is to be written to the wireless device 4, the frequency of the wireless device 4 is initialized to a specific frequency, and the frequency generated by the standard signal generator 6 is initialized. The frequency setting mode is activated in accordance with the frequency thus set.

FIG. 4 is a flowchart showing a receiving process of the wireless device based on the present invention.

In the reception process, first, in step 81, the tone frequency is 55 Hz
Is determined. In step 81, the tone frequency is 55
If it is determined to be Hz, the process proceeds to step 82, where the frequency setting mode is started. Then, the above-mentioned usable frequency is written in the EPROM or the like of the wireless device 4.

If it is determined in step 81 that the tone frequency is not 55 Hz, the flow advances to step 83 to determine whether or not the tone frequency is the set frequency. If it is determined in step 83 that the tone frequency is the set frequency, the flow advances to step 85 to cancel the reception mute. By canceling the reception mute, the received and demodulated sound is amplified and output from the speaker.

If it is determined in step 83 that the tone frequency is not the set frequency, the flow advances to step 84 to continue receiving mute. This continuation of the reception mute is when the radio wave of the reception frequency is received but the frequency of the tone signal is different from the set frequency, and the received and demodulated sound is not output from the speaker. become. The process returns to step 81 from the above steps 84 and 85, and the same processing is repeated and continued.

In the above embodiment, the setting mode of the usable frequency of the commercial wireless device has been described as an example of the special mode, but the wireless device in the special mode starting device of the wireless device of the present invention is:
The special mode is not limited to the commercial radio, and the special mode is not limited to the usable frequency setting mode.

〔The invention's effect〕

As described in detail above, the special mode starting device for a wireless device according to the present invention does not allow a general user to start the special mode without permission, and furthermore, a store or the like uses high-priced dedicated equipment or the like. It is possible to easily activate the special mode and perform a predetermined operation without performing the operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of a special mode starting device for a radio device according to the present invention. FIG. 2 is a block diagram showing a radio device to which one embodiment of the special mode starting device for a radio device of the present invention is applied. FIG. 3 is a schematic diagram showing a state where a frequency setting operation is being performed by a wireless device to which the present invention is applied, and FIG. 4 is a flowchart showing a receiving process of the wireless device based on the present invention. (Explanation of symbols) 1... Tone squelch circuit 2... Special mode tone discriminating means 3... Special mode starting means 4... Radio equipment 5... Antenna 6... Standard signal generator 7. ... Tone signal generator, 41 ... High frequency circuit, 42 ... FM demodulation circuit, 43 ... Mute circuit, 44 ... Audio amplification circuit, 45 ... Speaker, 46 ... Display unit, 47 ... Microprocessor, 48 …… EEPROM, 49 …… Operation part.

Claims (3)

(57) [Claims] When a tone signal having a predetermined frequency included in a radio wave is not detected, the wireless communication is cut off. When the tone signal is detected, the cutoff of the wireless communication is canceled, and the same frequency is used. A special mode starter for a radio, comprising: a tone squelch circuit (1) for preventing radio communication interference; and activating a special mode enabling a communication function of the radio to be specially changed. It is determined whether or not the frequency of the detected tone signal is outside the frequency band including a plurality of frequencies used for normal tone squelch and is a special mode tone signal having a frequency not normally used for the tone squelch. Special mode tone discriminating means (2), and the tone signal frequency detected by the tone squelch circuit (1) is set to a special mode. When the tone signal, special mode activation device radios equipped with special mode activation means for activating a special mode (3), the. 2. The special mode is a frequency setting mode, and when the frequency setting mode is activated, a predetermined frequency is written into a storage unit in the radio by using a display unit and an operation unit of the radio. 2. The apparatus according to claim 1, wherein the transmission / reception frequency of the radio is set to the predetermined frequency. 3. The apparatus according to claim 1, wherein the special mode tone signal has a lower frequency than a frequency used for the normal tone squelch.