JP3128272B2 - Channel scanning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel scanning apparatus , and more particularly to a channel scanning apparatus used in a receiving apparatus for receiving and listening to audio information via radio. is there.

[0002]

2. Description of the Related Art Conventionally, a channel scanning device is used.
While as the location, in general, the noise is generated,
The presence or absence of a channel signal is detected using noise squelch that stops audio output. For example, while scanning between the carrier of the channel output by a specific broadcast station and the carrier of another channel output by another specific broadcast station, there is much noise, and during this time the sound is Mute is applied to prevent discomfort.

In such a conventional channel scanning apparatus , since noise squelch is monitored for each channel having a different frequency to be scanned for an equal time, scanning is performed. As the number of channels increases, the time required to scan all channels increases, so that there is a problem that the monitoring time of the channel desired by the user decreases.

The drawback is that, specifically speaking, since each channel having a specific frequency different from each other output from a plurality of broadcasting stations (which may be a fixed station or a mobile station) is evenly scanned, it is difficult to listen to it. Alternatively, for channels that do not need to be heard very accurately, scanning is stopped for a predetermined period of time, and then the other channels are scanned. There were drawbacks such as the inability to hear with a high degree of accuracy and the loss of some of the necessary audio information.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the above-mentioned drawbacks of the prior art, and to provide a user with a difference in scan stop time for squelch detection in each of a plurality of channels, thereby enabling a user to make a difference. An object of the present invention is to provide a channel scanning device capable of accurately grasping desired audio information.

[0006]

The present invention employs the following technical configuration to achieve the above object. That is, receivable audio information via radio
Definitive in Noh reception apparatus to scan a plurality of channels
And it will have you in the channel scanning device, the scan
Channel squelch detection for each channel
Squelch detection time for performing
Storage means capable of causing a
The storage time of the scan in the channel is stored in the storage means.
Control based on squelch detection time stored in memory
A channel scan configured to
Device .

[0007]

The channel scanning apparatus according to the present invention varies the squelch monitoring time for each channel according to the priority of the channel in order to make it easier for the user to grasp the desired channel when scanning a large number of channels. By setting the squelch monitoring time for a channel desired by the user to be long, it is possible to preferentially listen to the voice information for other channels preferentially for a long time.

[0008]

EXAMPLES Hereinafter, the channel scanning instrumentation according to the present invention
Specific examples of the arrangement will be described in detail with reference to the drawings. FIG.
FIG. 1 is a diagram illustrating the principle of a channel scanning device according to the present invention and an outline of a specific example of the channel scanning device according to the present invention.

Referring to FIG. 1, a channel scanning device according to the present invention is a receiving device 1 for receiving audio information via radio, in which a receiving unit 2 and a plurality of different channel frequencies are stored in advance. A signal processing unit 3 and a frequency setting unit 6 provided with a storage unit 4 for storing a plurality of mutually different squelch detection times in advance. The receiving operation is executed by sequentially scanning the channel frequencies of the squelch and simultaneously selecting and setting the squelch detection time at the channel frequency from the squelch detection times stored in the storage means 5. Channel scanning device .

In the present invention, the user registers in advance the channels output from a plurality of broadcasting stations for which the user wants to listen to the audio information in the channel frequency storage means 4 provided in the signal processing section 3. At the same time, an appropriate timer value is registered in the squelch detection time storage means 5 provided for each channel. The voice information in the present invention includes music, telephone calls, taxi calls and all other audible information.

Further, the squelch detection in the present invention may be noise squelch detection, or may employ a squelch detection method for detecting an output of normal voice or the like or a squelch detection method using carrier detection. That is,
In the present invention, in the case of detecting noise squelch, when scanning between frequencies where the carrier output from each broadcasting station is present, the output of noise noise is large. The output is detected, the squelch detection signal is turned off, and the receiving device is muted.

On the other hand, in the case where the squelch detection method for detecting the output of normal voice or the like without using the noise squelch detection means in the present invention, the frequency band where the voice output does not exist is used. While the area is being scanned, the squelch detection signal is turned off to mute the receiving device. Further, in the present invention, since the signal processing unit 3 is provided with the memory unit 4 for storing a plurality of channels, the user can select frequency channels of a plurality of broadcasting stations that the user wants to listen to and register them in advance. Can be kept.

A memory unit 5 having a timer function for setting the squelch detection time is provided in parallel with the memory unit 4.
Is provided, and each of the selected and registered channels is provided.
The squelch detection time can be set corresponding to the squelch detection time. For example, if the user selects channels 80 MHz, 90
First, the respective frequencies when it is desired to listen to the three types of channels of MHz and 100 MHz are stored in the memory 4 first, and the timer value for setting the squelch detection period in each channel is set in the memory 4. Memory 4
Is set arbitrarily in accordance with the number of channels stored in the memory 5, and is registered and stored in the memory 5.

In the present invention, when the timer value is stored in the memory 5, a priority can be set for each of the channels that the user wants to listen to. We want to be thinking
It is possible to assign the longest timer value to give the highest priority to the channel , and to assign a shorter timer value to the other channels .

For example, if the user wants to listen to the above-mentioned channel of 80 MHz well, the position of the memory 5 corresponding to the channel 80 MHz stored in the memory 4 is set to 10 seconds (S). A timer value is stored, and a short timer value such as 1 second or 2 seconds is stored in a position of the memory 5 corresponding to another channel .

The distribution or weighting of the timer values can be arbitrarily determined. In the present invention, by adopting such a method, when the channel that the user wants to hear most is scanned,
Its tea during the timer value specified for the channel
Channel , so you can hear the audio information of that channel for a long time, but for channels that you think you don't need to listen to so accurately, you can stop for a relatively short time, so the reception time is efficient. Can be used.

The operation of the channel scanning device according to the present invention will be described. First, in the signal processing unit 3, one specific channel is selected from the memory unit 4;
The frequency setting unit 6 sets the transmission frequency of the receiving unit 2 to the frequency of the selected channel.

Next, if the squelch detecting means 8 provided in the receiving section 2 is operated and voice information is inputted, a signal having a squelch detecting signal is outputted from the squelch detecting means 8 to the signal processing section 3. Then, the control circuit 9 provided in the signal processing unit 3 causes the receiving unit 2 to output a signal for fixing the channel of the receiving unit 2 to the frequency and turning off the mute to the receiving unit 2, and the audio information at that time is The audio information is output in analog form via appropriate audio means connected to the receiving unit 2, for example, a speaker, a telephone receiver, or the like.

The squelch detecting means 8 used in the present invention detects the squelch from the squelch detecting means 8 when there is no sound output, when the sound information is interrupted on the way, or when the noise level is high. A signal without signal is output to the signal processing unit 3 and the control circuit 9 of the signal processing unit 3
To turn on the mute circuit of the receiving section 2 and cut off the output of audio information.

The squelch detecting means used in the present invention, when there is no audio output, when the audio information is interrupted on the way, or when the noise level is high, the squelch on the specified channel. Although exit detection go scan the next channel, before that, the switch
It is configured to check whether the timer value of the squelch detection period in the channel has elapsed, and if the timer value has not elapsed, continue the squelch detection operation in the channel . Thereafter, when the timer value has elapsed, the signal processing unit 3 selects a channel having the next different frequency stored in the memory 4,
The same processing as above is repeated.

When scanning is completed for all the channels registered in the memory 4 in advance, the process returns to the first channel and repeats the above-described scanning operation again. Therefore, in the channel scanning device according to the present invention, if a timer value is set in advance for a channel that the user particularly wants to listen to, the channel can be preferentially output. This eliminates the problem that the audio information is interrupted on the way or the start portion is erased, so that accurate audio information can be heard.

FIG. 2 is a flowchart showing the above operation of the channel scanning apparatus according to the present invention. That is, after the start, the frequency for one channel selected from the signal processing unit 3 in step (a) is sent to the frequency setting unit 6 and set in the receiving unit 2. In step (b), an acknowledgment (ACK) signal for notifying the signal processing unit 3 that the frequency has been set is output. Step (b) may be omitted.

Next, in step (c), the timer value of the squelch detecting means set in correspondence with the selected frequency, which is stored in the memory 5 in the signal processing unit 3, is read out. Set the squelch detection circuit. In step (d), the squelch detection operation is started, and when the presence of the output of the audio information is confirmed in the channel at the frequency, that is, when the call or the broadcast is being performed, the squelch detection is performed. An ON signal is output from the circuit 8,
In response to the ON signal, the signal processing unit 3 fixes the channel having the frequency and outputs a signal for turning off the mute circuit 10 in step (e) from the signal processing unit 3 to the receiving unit, Step (f): sending to the mute circuit 10 provided in the receiving section 2 and outputting audio information via the audio means 7; and then, when the flow is during a call or broadcasting, that is, when the audio information is Step (d) is repeated at a predetermined interval, for example, on the order of msec as long as the output is performed.

Next, in step (d), if the audio information is interrupted or if there is no broadcast station, the squelch detection circuit 8 outputs an OFF signal and responds to the OFF signal. Then, a signal for turning on the mute circuit 10 in the signal processing unit 3 is transmitted to the signal processing unit 3.
And (g) outputting to the mute circuit 10 provided in the receiver 2 to stop the output of the audio information from the audio means 7.

Then, in step (h), it is determined whether or not a timer value for defining the scan time of the set channel frequency has elapsed (whether it is within the set time or not). If the timer value has not elapsed (ie, if YES), the process returns to step (d) and repeats the above steps. On the other hand, if NO in step (h), that is, if the set timer value time has elapsed, it is determined in step (i) whether the operation is OFF, and the operation is continued. If there is, return to step (a) and store the channel having the next frequency in memory 4.
, And the timer value stored in the memory 5 corresponding to the newly selected frequency is selected, and the above steps are repeated.

By the repetition, the memories 4, 5
Is selected once, the operation of the present invention selects again the first frequency and timer value stored in the memories 4 and 5, and repeats the above operation. If the operation of the present invention is to be stopped, the answer is YES in step (i), and END is set.

[0027]

According to the present invention, since the above-described configuration is employed, the squelch monitoring time for the channel outputting the audio information that the user wants to hear is varied according to the priority. By setting a longer squelch monitoring time for a channel that the user particularly desires, audio information can be preferentially heard longer and more accurately for other channels.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of a channel scanning device according to the present invention and the configuration of one specific example.

FIG. 2 is a channel scanning apparatus according to the present invention.
It is a flow chart showing the operation flows.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receiving apparatus 2 ... Receiving part 3 ... Signal processing part 4, 5 ... Memory part 6 ... Frequency setting circuit part 7 ... Audio means 8 ... Squelch detecting means 9 ... Control circuit 10 ... Mute circuit

Claims (1)

(57) [Claims] 1. A definitive to capable of receiving receiving apparatus voice information via a radio, continue to scan multiple channels Ji
And have you to Yan'nerusukyan device, for each channel to perform the scan, the channel
Arbitrarily set the squelch detection time for performing squelch detection.
Storage means capable of being set and stored; and, during the scan, stopping the scan on the reception channel.
The stop time is set to the squelch detection time stored in the storage means.
Control means for performing control based on the channel scan apparatus.