JP2857678B2 - Squelch signal control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a squelch signal control method for increasing a scan speed or a response speed of a wireless device.

(Prior Art) In a wireless device, the time after the PLL is locked until the squelch signal is determined varies depending on the position of the squelch volume. When implementing the scanning function in such a wireless device, the squelch signal is confirmed after a maximum time until the squelch signal is determined, and the scan is stopped.

FIG. 3 is a block diagram for explaining a conventional squelch signal control method. To explain this,
Reference numeral 1 denotes a level setting means for setting a noise detection level using a squelch volume (not shown).
Numeral 2 is a demodulator nozzle level detecting means for detecting a nozzle level generated by the FM detection demodulator 3 and generating a scan stop signal when the nozzle level exceeds a predetermined value. The switch 5 turns off the signal going from the terminal to the low-frequency amplifier circuit 4. Reference numeral 6 denotes a speaker connected to the low frequency amplifier circuit 4.

(Problems to be Solved by the Invention) According to such a system, the squelch waiting time is the maximum time regardless of whether the squelch volume is at the tight squelch position or the threshold position. As a result, the scan speed was constant in the slower direction. The present invention has been made in view of this point, and an object of the present invention is to provide a squelch signal control method capable of increasing a scan speed or a response speed of a wireless device.

(Means for Solving the Problems) According to the present invention, as means for solving the above problems, there is provided position detecting means for detecting the position of the squelch volume, and the squelch volume is determined based on the detected value of the position detecting means. Set the time so that the squelch signal wait time is longer when in the squelch position. This is how we got it.

(Operation) By implementing such a method, it is not necessary to wait for the maximum time for the squelch signal as in the related art, so that the scan speed or the response speed of the wireless device is significantly increased.

(Embodiment) Next, a squelch signal control method according to the present invention will be described with reference to FIG. 1 with reference to FIG. In the present invention, a position detecting means 7 for detecting the position of the squelch volume is provided. The output side of the position detecting means 7 is connected to a squelch volume position correspondence timer 8 and the input side of the comparing means 9. The output side of the position correspondence timer 8 is connected to the control terminal of the comparing means 9.
, A comparison start signal is given. The input side of the comparing means 9 is connected to the output side of the demodulator noise level detecting means in addition to the output side of the above-mentioned squelch volume position detecting means 7 so that these output signal values are compared. .

In the circuit having such a configuration, when the squelch volume is at the position of tight squelch, the time is set so that the squelch signal waiting time becomes longer when the squelch volume is at the position of tight squelch.
When the squelch signal is at the threshold position, the time can be set so as to shorten the squelch signal waiting time, and a method of increasing the scan speed or the response speed of the wireless device can be obtained. More specifically, a scan stop signal is obtained by a comparison start signal provided from the squelch volume position correspondence timer 8 to the comparison means 9, so that a scan stop signal can be obtained in a time corresponding to the position of the squelch volume. Become. FIG. 2 shows the flow of the method of the present invention in steps 10 to 21.

In the method of the present invention described above, as a means for detecting the position of the squelch volume, the squelch volume is captured by an A / D converter and a microcomputer,
And setting the position of the squelch volume directly in the microcomputer using an up / down switch or the like. Based on the position of the squelch volume detected by these means, the scan stop signal or the audio signal is turned on and off after a predetermined period of time, by comparing it with the noise level of the demodulator output.

(Effects of the Invention) Since the present invention is a squelch signal control method configured as described above, it is not necessary to wait for a squelch signal for a maximum time as in the related art, so that the scan speed or the response speed of the wireless device is remarkably increased. Be fast.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit for realizing the method of the present invention;
FIG. 2 is a flowchart showing the flow of the method of the present invention, and FIG. 3 is a block diagram showing a conventional circuit. 2 ... demodulator noise level detecting means 3 ... FM detection demodulator 4 ... low frequency amplifying circuit 5 ... switch 7 ... squelch volume position detecting means 8 ... squelch volume position corresponding timer 9 ... comparing means

Claims (1)

(57) [Claims] 1. A squelch volume position detecting means for detecting a position of a squelch volume, and a time setting is set based on a value detected by the position detecting means so that a squelch signal waiting time becomes long when the squelch volume is at a tight squelch position. A squelch signal control method characterized by setting a time so as to shorten a squelch signal waiting time when the squelch signal is at a threshold position, thereby increasing a scan speed or a response speed of a wireless device.