JPH09312580A - Method for setting squelch lever in provable radio equipment and portable radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an economical portable radio equipment where a squelch level corresponding to usage environment is easily set. SOLUTION: Squelch data where the reception sensitivity of a used frequency band is considered in accordance with the band is previously measured and stored in a memory 12. Moreover, since reception electric field strength is changed due to the environment, squelch data is specially set by the operation of a command input key 13 in accordance with the environment by a user and it is also stored in the memory 12. Which kind of squelch data is used is selected by a change-over key 134 at the time of usage and a switch 3 is controlled by using it as the squelch level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squelch level setting method for a portable wireless device and a portable wireless device having a function of performing squelch level setting by the method.

[0002]

2. Description of the Related Art In a portable radio device, noise is output from a speaker when there is no received radio wave, so that a noise squelch function is incorporated to disconnect an audio output circuit when the received electric field strength is reduced. FIG. 2 is a block diagram showing a conventional circuit configuration example that realizes this noise squelch function.
The audio signal extracted by the demodulator 1 is the electronic volume 2
And is guided to the speaker via the switch 3. The output of the audio control volume 4 is sent to the CPU via the A / D converter 5.
8 and the CPU 8 adjusts the electronic volume 2 according to the input and controls the output volume.

The above is the basic circuit of the audio output system of the portable wireless device, but other circuits realize the above-mentioned noise squelch function. That is, the squelch filter 9 extracts a predetermined voice band component from the demodulator output, the power level of this component is detected by the detector 10, digitized by the A / D converter 6, and input to the CPU 8 as a received electric field level. On the other hand, the output of the squelch level adjusting volume 11 is also digitized by the A / D converter 7 and input to the CPU 8 as a squelch level. The CPU 8 compares the received electric field level with the squelch level, and when the received electric field level becomes lower than the squelch level, outputs a control signal to the switch 3 to cut off the audio output. In this conventional example, the squelch level is set by the user operating the adjustment volume 11. In addition, the reference numeral of the portion surrounded by the dotted line in FIG.
Reference numerals 50 and 51 are ASP (Audio Signal Proce
ssor), reference numeral 52 indicates each unit of the microcomputer.

FIG. 3 is a block diagram showing another circuit configuration example for realizing the noise squelch function, and the same circuits as those in FIG. 2 are denoted by the same reference numerals. 2 is different from the conventional example shown in FIG. 2 in that the squelch level is set instead of the squelch level adjusting volume 11 and the A / D converter 7, and a memory 12 is used.
This is done by the squelch data stored in.
This squelch data has a plurality of values according to the reception frequency of the portable wireless device. For example, in the case of a system using a large number of channels within a band of about 28 MHz, 28 MHz is divided into about 5 bands, one squelch data is defined for each, and this is used as a squelch level. This is because the reception sensitivity changes when the reception frequency greatly differs, so by setting a lower squelch level for channels in the frequency band with low reception sensitivity, it is possible to continue the call even if the S / N ratio is bad. This is because it is necessary to

[0005]

Among the above-mentioned conventional techniques, in the squelch level setting method shown in FIG. 2, the squelch level is changed every time the user changes not only the use environment but also the reception frequency, that is, the use channel. There is a problem that it is difficult to use because the setting operation of is required. On the other hand, FIG.
The squelch level setting method described in (1) has a drawback that the user cannot appropriately change the squelch level because the squelch level is determined by the used channel even when the use environment changes greatly.

An object of the present invention is to use a squelch level preset according to a channel used or a squelch level set by a user's operation input so that the squelch level can be arbitrarily selected and used as a squelch level. (EN) A level setting method and a portable wireless device having a function of setting a squelch level by the method.

[0007]

In order to achieve the above object, according to the present invention, a squelch level for stopping audio output when the detected value of the received electric field strength of a portable radio is below that level. A method of setting the squelch level is stored in a memory according to the reception sensitivity of each frequency band, and the user can arbitrarily set the squelch level by using an input key provided in the portable wireless device. A mechanism that can be set is provided, the second squelch data arbitrarily set by the user by the mechanism is also stored in the memory, and the first or second squelch data is selected by a switching key and used as a squelch level. Disclosed is a characteristic squelch level setting method for a portable wireless device.

Also disclosed is a portable wireless device configured to set the squelch level by using the squelch level setting method for the portable wireless device.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing a circuit configuration example of a portable wireless device according to the present invention, and particularly shows a portion related to a noise squelch function. In the figure, a demodulator 1, an audio control volume 4, an ASP 50 including a squelch filter 9 and a detector 10, an ASP 51 including an electronic volume 2 and a switch 3, a microcomputer including A / D converters 5 and 6 and a CPU 8. The configuration of the unit 52 is the same as that of the conventional example shown in FIG. Memory 12 is different
The command input key 13 is used to arbitrarily set the squelch data stored in the squelch data and a part of the squelch data, and the operation of the CPU 8 corresponding to these is partially different.

The operation of the circuit shown in FIG. 1 is the same as that of the conventional circuit shown in FIG. 3, especially when the user does not operate the squelch level. That is, in the memory 12, the entire frequency band used is divided into some, and the squelch level defined for each is stored as squelch data. Then, with the squelch data as a comparison target, the detection levels of the detector 10 are compared by the CPU 8, and the squelch operation is performed.

On the other hand, when the user uses the environment (electric field strength)
When the squelch level is set according to, the command input key 13 can be used. That is, the command input key 13 is the menu key 131 and the up key 1
32, a down key 133, and a switching key 134 are prepared, and when the squelch setting mode is selected by the menu key 131, the CPU 8 switches to the squelch setting mode, and the squelch data in the channel is set by the up key 131 or the down key 132. It will be ready. Here, each time the up key 131 or the down key 132 is pressed, the squelch data can be increased or decreased by one bit to set the desired squelch level. When the setting is completed and the squelch setting mode is released, the squelch data set to the desired squelch level is transferred to the address corresponding to the channel in the memory 12 in the CPU 8
The squelch data can be recalled as needed until the data is automatically saved. Whether to use the squelch data set by the command input key 13 or the preset normal squelch data is determined by the switching key 134.

According to the embodiment of FIG. 1 described above, the squelch level according to the use environment can be selected and used only by operating the switching key, and the usability is improved. In addition, the setting of squelch data by the command input key can be used for inspection / evaluation at the time of manufacturing the portable wireless device.
Moreover, since the command input keys described above can be used as input keys for other operations provided in the portable wireless device, it is only necessary to prepare a simple program for the CPU.
It can be realized without using special hardware such as the squelch setting volume, and there is an advantage that the processing function by the program can be realized with an extremely simple program by directly digitally operating the setting of the squelch data.

[0013]

According to the present invention, it is possible to easily select and use a squelch level according to the use environment and to realize an economically excellent portable wireless device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a squelch setting method of the present invention.

FIG. 2 is a block diagram showing an example of a conventional squelch setting method.

FIG. 3 is a block diagram showing another example of a conventional squelch setting method.

[Explanation of symbols]

 3 Audio circuit breaker switch 8 CPU ... Send commands 9 Squelch filter 10 Detector 12 Memory 13 Command input key 131 Menu key 132 Up key 133 Down key 134 Change key

Claims (2)

[Claims] 1. A method of setting a squelch level for stopping audio output when a detected value of a received electric field strength of a portable radio device is equal to or lower than the level, and a method of setting a squelch level for each frequency band according to its reception sensitivity. The first squelch data predetermined by the user is stored in the memory, and a mechanism that allows the user to arbitrarily set the squelch level by the input key provided on the portable wireless device is provided. A squelch level setting method for a portable wireless device, wherein the second squelch data is also stored in the memory, and the first or second squelch data is selected by a switching key and used as a squelch level. 2. A portable wireless device configured to set the squelch level using the squelch level setting method for a portable wireless device according to claim 1.