JPH02298120A - Squelch control method for radio equipment - Google Patents

Abstract

PURPOSE:To block the output of receiver noise till a reception input signal comes after the end of transmission by providing a timer means operated at the point of time of changeover from a sender side to a receiver side so as to apply the control of a squelch switch after a prescribed time set to a timer means. CONSTITUTION:A timer circuit 12 starts counting after a receiver section power output 2 rises and outputs the same signal as that in the presence of a noise in a receiver for a time t1sec longer than the time tsec when at least a noise detection output 5 rises. Then a voltage comparator circuit output 6 inputted after the time t1sec is outputted as a squelch control signal 7. Then the squelch control signal 7 controls a squelch switch 13. As a result, a reception section power output 2 is applied from a speaker and a speaker output 8 is outputted only in the case of the squelch control signal 7 in the receiver discriminator output. Thus, noise at the time of transmitting and receiving is cancelled.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a squelch control method for a wireless device using a press-talk method.

[Conventional technology]

FIG. 4 is a timing diagram showing a squelch control method for a wireless device using this type of press-talk method. In Fig. 4, 1 is the power output of the transmitting section of the radio, 2 is the power output of the receiving section which is inverted from the power output 1 of the transmitting section of the radio, and 3 is the receiving input sent from the other station after transmission is completed. be. 4 is a receiver noise output of the receiver discreet output, 5 is a noise detection output obtained by rectifying the receiver noise output 4, 6 is a voltage comparator output for comparing a predetermined reference voltage and the noise detection output 5, and 7a 8a is a control signal for a squelch switch provided after the receiver discreet output, and 8a is a speaker output after passing through the squelch switch. Next, the operation will be explained. In the case of this conventional radio, after transmission is completed, the transmitter power output 1 falls, the receiver power output 2 rises, and the receiver noise output is maintained until receiver power 3 is applied to the receiver discreet output. 4 is output. The receiver noise output 4 is rectified by the noise detection circuit, and the noise detection output 5 rises after t seconds and is input to the voltage comparator, and the voltage comparator output 6 becomes the squelch control signal 7a. , IIJ# of the squelch switch provided between the receiver discreet output and the speaker. Therefore, when the receiver power output 2 is applied to the speaker and the squelch control signal 7a is a signal when there is no noise in the receiver discret output, voice or noise is outputted as the speaker output 8a.

[Problem to be solved by the invention]

Since the conventional squelch control method of a wireless device using the press-talk method is configured in one or more ways, after transmission is completed, the mode is switched to reception, and the receiver power output 2 is added, the noise detection output 5 is During the one second period until the signal rises, receiver noise is output from the speaker, which is extremely annoying. This invention was made in order to solve the above-mentioned problems, and is a wireless radio that can prevent receiver noise output from a speaker from the time transmission is switched to reception until reception input is input. The purpose of this study is to obtain a squelch control method for a machine.

[Means to solve the problem]

A squelch control method for a radio according to the present invention includes a timer means that is activated at the time of switching from the transmitting side to the receiving side, and controls the squelch switch after a predetermined time set in the timer means. It is something.

[Effect]

In the squelch control method of the present invention, the timer means starts counting when the receiver power output rises, and after a set predetermined time, a squelch switch control signal is output, thereby eliminating noise output.

【Example】

Embodiments of the squelch control method for a wireless device according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a timing diagram showing a squelch control method for a wireless device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an outline of a device configuration to which the method of the above embodiment is applied. Also in the timing diagram of this embodiment method shown in FIG. 1, 1 is the power output of the transmitting section of the radio, and 2 is the power output of the transmitting section of the radio! 3 is the inverted power output of the receiving unit, and 3 is the receiving input sent from the partner station after the transmission is completed. 4 is a receiver noise output of the receiver discreet output, 5 is a noise detection output obtained by rectifying the receiver noise output 4, 6 is a voltage comparator output for comparing a predetermined reference voltage and the noise detection output 5, and 7 is the voltage comparator output 6 as a timer means. For example, 8 is the control signal of the squelch switch after passing through the timer circuit, and is the speaker output after passing through the squelch switch. In addition, in the apparatus configuration according to this embodiment method shown in FIG. 2, 9 is a noise filter for receiver noise output 4;
10 is a noise detector that rectifies the noise output 4 passed through the noise filter 9; 11 is a voltage comparator that compares the detected output 5 with a predetermined reference voltage; 2 is a timer circuit for manually controlling the voltage comparator output 6, and 13 is a squelch switch controlled by the squelch control signal 7 after passing through the timer circuit 12. Next, the operation will be explained. Even in the case of the radio device according to the method of this embodiment, after the transmission is completed, the transmitter power output 1 falls, the receiver power output 2 rises, and the period until the receiver's human power 3 is applied to the receiver discreet output. , receiver noise output 4 is output. Next, the receiver noise output 4 passes through a noise filter 9 and is rectified in a noise detector 10, and a noise detection output 5 rises and is output after 4 seconds. It is input to the voltage comparator 11. Further, the voltage comparator 11 compares the noise detection output 5 with a predetermined reference voltage and outputs a voltage comparator output 6, and this voltage comparator output 6 is manually inputted to the next timer circuit 12. Furthermore, the timer circuit 12 starts power supplying after the power supply output 2 of the receiving unit rises, and outputs the same signal as when there is noise in the receiver for at least U seconds, which is longer than 1 second. At the same time, the input voltage comparator output 6 is outputted as a squelch control signal 7 after ti seconds. The squelch control signal 7 controls a squelch switch 13 provided between the receiver discreet output and the speaker, and as a result, the receiver power output 2 is applied from the speaker, and the squelch control signal Speaker output 8 is output only when signal 7 is a signal with no noise in the receiver discret output, and in this way, noise can be eliminated during the intended transmission and reception. . In addition, in the revised embodiment, a hardware case was described in which the timer circuit 12 was provided between the voltage comparator 11 and the squelch switch 13, but as shown in another embodiment in FIG. CP instead of timer circuit 12
A similar timer effect may be obtained by intervening the U (central control unit) 14 and using a software timer section 14a within the CPU 14, and the same effect can be obtained.

【Effect of the invention】

As described above, according to the present invention, a timer means is provided that is activated to count at the time of switching from the transmitting side to the receiving side, and the control signal of the squelch switch is outputted after a predetermined time set in the timer means. Therefore, it is possible to effectively prevent receiver noise from being output from the speaker until reception input is received after transmission is completed.

[Brief explanation of drawings]

FIG. 1 is a timing diagram showing a squelch control method for a wireless device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an outline of a device configuration to which the method of the above embodiment is applied, and FIG. 3 is a diagram showing another embodiment of the same. FIG. 4 is a block diagram showing an outline of a device configuration to which the example method is applied. FIG. 4 is a timing diagram showing a conventional squelch control method for a wireless device. 1 is the transmitter power output, 2 is the receiver power output, 3 is the reception input, 4 is the receiver noise output, 5 is the noise detection output, 6 is the voltage comparator output, 7 is the squelch control signal, 8 is the speaker output, 9 is a noise filter, 10 is a noise detector, 1
1 is a voltage comparator, 12 is a timer circuit (means having a timer function), and 13 is a squelch switch. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent Applicant Mitsubishi Electric Corporation - Figure 1 Ukei Yoshizumi Noise Seven Car r-11111-
----------L21-1111111 Figure 2 1
3-11 town

Claims (1)

[Claims] In the press-to-talk type wireless device having a squelch control function, the squelch switch is controlled until the power source of the transmitting section on the transmitting side is switched to the power source of the receiving section on the receiving side and reception input is applied. 1. A squelch control method for a wireless device, comprising: providing a timer means that is activated at the time of switching to the receiving side; and causing the squelch switch to output a squelch control signal after a predetermined time set in the timer means.