JPH048676Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transceiver, and particularly to a tone oscillation circuit for driving a repeater (automatic relay station).

(Prior Art) The reachable range of high frequency radio waves in the VHF band (very high frequency band) or higher is usually limited to line-of-sight distance. Therefore, when communicating with a partner station located further away, it is necessary to relay the communication. A repeater is installed as a relay station. The repeater shifts the received frequency to another frequency, for example, in Japan's 430MHz amateur band, the transmitting frequency is 5MHz higher than the receiving frequency and transmits. There are various driving methods for repeaters depending on the country. For example, (1) a method in which a tone signal is continuously superimposed on the modulated audio signal during the transmission period, (2) a method in which a tone signal is temporarily superimposed only at the beginning of transmission, (3) a method in which the carrier wave of the transmitted radio wave (or carrier wave suppression) is used. In the case of radio waves, there are methods that use modulated waves.

The method listed in (1) above is permitted for amateur wireless service under Japan's Radio Law. As a method for amateur radio stations to automatically drive (start and stop, etc.) repeaters using FM transceivers, they superimpose and modulate tone signals on audio signals (frequency range of approximately 300Hz to 3kHz). The tone signal currently uses a frequency of 88.5Hz, but there are also 31 other waves (67.0Hz to 203.5Hz).
has been decided. The repeater detects the tone signal frequency of the transmitting station and performs a relay operation. Repeaters are provided with a hold time of 1 to 3 seconds (called a hang-up time) so that they can continue relaying even if the received signal is strong or weak or if there is a temporary interruption.

Further, in order to prevent a plurality of repeaters from being driven at the same time and to select a desired repeater, a predetermined tone signal frequency is predetermined for each repeater from among the aforementioned 32 tone signal frequencies.

As mentioned above, when performing wireless communication via a repeater, it is necessary to incorporate a tone oscillation circuit that generates a tone signal into the transceiver on the transmitting side (that is, the wireless station driving the repeater). Normally, transceivers have a built-in microcontroller, but this microcontroller uses a PLL to control the transmitting and receiving frequencies.
It is used for replacing data, displaying data, and performing various controls. On the other hand, conventional tone oscillator circuits are independent from the transceiver circuit, and include a crystal oscillator, frequency divider, etc. built into a printed circuit board as a dedicated unit. As a result, the number of circuit elements increases, the circuit becomes complicated, the number of production steps increases, and it is expensive. Furthermore, since it is necessary to incorporate a dedicated tone unit into the transceiver, there are problems such as the space required to incorporate it and the inability to downsize the transceiver.

Furthermore, digital data used for automatic transmission of the own station's call sign or opening/closing squelch operation of the other station's receiver using a digital code squelch system may be transmitted. Since this digital data is superimposed on the audio signal to be modulated, the reliability of the digital data may be impaired due to the influence of the audio signal.

(Purpose of the invention) The present invention was made in view of the above points, and its purpose is to eliminate the need for a dedicated tone unit.
In other words, the circuit elements of the tone oscillator circuit are not dedicated to the tone unit, but rather a microcomputer (microprocessor, hereinafter referred to as microcomputer) that originally controls the transmitting and receiving frequency of the transceiver.
It is an object of the present invention to provide a tone oscillation circuit which can also be used as a clock signal generator, etc., and which can obtain a plurality of tone frequencies with a simple circuit configuration. Another object of the present invention is to provide a tone oscillation circuit that can perform highly reliable transmission even when transmitting digital data.

(Structure of the invention) The tone oscillation circuit according to the invention is a transceiver whose transmitting and receiving frequencies are controlled by a microcomputer, which includes a clock means for controlling the microcomputer, a count means for counting the output signal of the clock means, and a repeater. a tone frequency setting means for setting a tone frequency for automatically driving the tone frequency setting means, a tone frequency display means for displaying the tone frequency set by the tone frequency setting means, and a tone frequency set by the tone frequency setting means. a tone frequency storage means for storing the tone frequency, and a comparison means for determining whether the tone frequency stored in the tone frequency storage means matches the count value of the counting means and resetting the counting means when the count values match; tone signal generation control means for controlling the generation of the tone signal; timing signal generation control means for receiving the output signal of the clock means and controlling the timing at which the tone signal is generated; and an output of the timing signal generation control means. It is comprised of an AND means for logically multiplying the output of the tone signal generation control means and the output of the comparison means, and a waveform shaping means for approximating the output of the AND means to a sine wave.

(Example) The first example of the tone oscillation circuit according to the present invention is
This will be explained based on FIGS. 4 to 4. FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a flowchart for explaining the operation of an embodiment of the present invention, and FIG.
The figure shows a time chart for explaining the operation of an embodiment of the present invention.

In FIG. 1, a case will be explained in which, for example, a tone signal of 100 Hz is output.

First, a tone frequency of 100 Hz is specified (input) to the tone frequency setting means 6. This specification method is
You may enter the frequency itself, "100", or you may enter the code number corresponding to 100Hz. The input information is displayed on tone frequency display means 5. The period of 100Hz is 10mS, but the period at which the level is reversed is half that, 5mS. Further, if the oscillation frequency of the clock means 1 is 1MHz, the period of the clock is 1μS. The tone frequency storage means 4 stores a value obtained by dividing 5 mS by 1 μS (ie, 5000). The counting means 2 counts the clock from 0 to the value (5000) stored in the tone frequency storage means 4. When the count reaches 5000, the comparison means 3 detects that the value stored in the tone frequency storage means 4 and the value counted by the counting means 2 match. Further, the comparing means 3 inverts the tone level and resets the counting means 2 to zero. Repeat this operation and use comparison method 3 to 100Hz.
A comparator output signal is output. This comparison means output signal controls the output of the tone signal by the AND means 8. The signal input to the AND means 8 is
These are the output signal of the tone signal generation control means 7 and the output signal of the timing signal generation control means 9. Tone signal generation control means 7 supplies to logical product means 8 a signal indicating that the transmission frequency is a repeater channel (frequency) and a signal indicating that a transmitting state is in progress by a PTT (push-to-talk) switch or the like. do. Further, the timing signal generation control means 9 controls the timing so that the transmission of the tone signal is temporarily interrupted (within the hang-up time) and the digital data is transmitted. If the tone signal is interrupted within the hang-up time, the interrupting operation of the repeater continues without being stopped. Since the tone output signal outputted from the AND means 8 is a rectangular wave, it contains many harmonic components. Therefore, the waveform shaping means 10 removes high frequency components so as to approximate a sine wave, and the resulting sine wave is supplied to the output terminal 11. The tone signal, which has become a sine wave, is supplied from the output terminal 11 to the modulation circuit of the transceiver.

In FIG. 2, KEY 15 is a tone frequency setting means, which sets (inputs) the tone frequency. The CRT 14 (or liquid crystal) is a tone frequency display means, and the tone frequency can be easily confirmed and set by visually observing the display. The frequency input circuit 16 and the transmission switch circuit 17 are tone signal generation control means. Frequency input circuit 16 provides information indicating the repeater channel (or frequency). Further, the transmission switch circuit 17 supplies information indicating the transmission state using a PTT switch or the like.

The microcomputer 20 has a CPU 21, a RAM 22,
It is composed of a ROM 23, a clock 26, an input port 24, and an output port 25, and has clock means, counting means, comparison means, tone frequency storage means, AND means, and timing signal generation control means. The CPU 21 functions as a counting means, a comparing means, a logical product means, etc.

Based on the program in the ROM 23, the CPU 21 counts clocks, inputs tone signal control signals, and detects that the value stored in the RAM 22 matches the count value of the counting means. The RAM 22 is a tone frequency storage means and stores the set tone frequency. ROM
A program for controlling the CPU 21 is written in 23, and controls the generation of timing signals.

Input port 24 has KEY 15, frequency input circuit 16, transmission switch circuit 17, output port 25,
A signal from a timing signal generation control circuit 12 or the like for external control is input.

When changing the count setting value of the timing signal generation control means determined by the program or controlling it at a completely different timing, masking the microcontroller requires a large amount of money and a long period of time to develop the program. It takes. As in the present invention, the output of the timing signal generation control means is once outputted from the output port 25 of the microcomputer 20, and then
By inputting from the output port 25, the output of the timing signal generation control circuit 12 can be input from the outside instead of the internal timing signal output from the output port 25. Therefore, changes can be made without depending on the program of the microcomputer 20.

The output port 25 outputs the tone output signal of the CPU 21. An LPF (low pass filter) 13 removes high frequency components from the tone output signal output from the output port so that it becomes a sine wave. After converting it into a sine wave, supply it to the output terminal. The output of the LPF 13 is supplied from the output terminal 11 to the modulation circuit of the transceiver.

In FIG. 3, when the transceiver is powered on, the microcomputer 20 clears the storage data area of the RAM 22, and then executes an initial setting routine 30. In the section where the standard value of the count setting value is loaded in the initial setting routine 30, it is also possible to memorize the count setting value that was set when the power of the transceiver is turned off, and to set it when the power is turned on again. It is. Alternatively, the setting may be made when communicating with a repeater. Next, the count setting value is output to the CRT 14 via the output port 25 of the microcomputer 20.

Next, a tone frequency setting routine 31 is executed.

The comparison means between the tone frequency storage means and the counting means is processed by executing a tone frequency comparison routine 32. By executing routine 32, the period of the tone frequency is set.

The period T of the tone frequency is expressed by the following equation.

Period T=1/2*tone frequency (Hz) (seconds) By repeating routines 31 to 35, the timing of counting is represented by the clock means output signal (FIG. 4, 40).

When the period T of the tone frequency has elapsed, the comparison means sequentially inverts the output flags and generates a comparison means output signal (FIG. 4, 41).

Thereafter, a tone signal generation control routine 33 and a timing signal generation control routine 34 are executed. In the tone signal generation control routine 33, it is determined whether the channel is in a transmitting state or a repeater channel. When it is in the transmitting state and is a repeater channel, the output flag is set high. A tone signal control signal (42 in FIG. 4) is output from the tone signal generation control means.

A timing signal generation control routine 34 is used to generate a control signal that interrupts the tone signal with digital data. ROM2 in advance
A count setting value of the timing signal generation control means is determined in the program stored in the computer 3, and when the count value and the count setting value become one value, it is determined that a certain period of time has elapsed, and the input flags are sequentially inverted.

The AND routine 35 performs an AND operation using the flag of the tone signal generation control routine 33 and the flag of the timing signal generation control routine 34. The tone signal is set to be high during the period when the tone signal is generated. Then, the output flag is outputted via the output port 25 and inputted to the input port 24. Timing control signals are stored in RAM22. The timing signal generation control means is configured to start counting at the same time as the transmission, and to emit a repeater drive signal at regular intervals.

(Effects of the invention) The tone oscillation circuit according to the invention can perform the same operation as a conventional transceiver with a built-in dedicated tone unit by simply adding a low-pass filter or the like. There's no need. Therefore, parts can be removed, man-hours can be reduced, and problems with installation space can be solved. Since it can be set by inputting a predetermined tone frequency from the KEY, it is also possible to select a repeater. Therefore, communication can always be performed in the best condition. Even when using a repeater, the reliability of the digital data is not compromised and the repeater does not malfunction. Since the timing is controlled by the transceiver's clock signal, there is no need to synchronize the tone unit and the transceiver. Even when changing the timing control signal,
It has excellent effects such as being able to be developed easily, in a short period of time, and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of the present invention, Fig. 2 is a block diagram showing the configuration of an embodiment of the invention, Fig. 3 is a flowchart for explaining the operation of an embodiment of the invention, and Fig. 4. is a time chart for explaining the operation of one embodiment of the present invention. 2...Counting means, 3...Comparison means, 4...
Tone frequency storage means, 7... tone signal generation control means, 8... logical product means, 9... timing signal generation control means.

Claims (1)

[Scope of utility model registration request] A transceiver whose transmission and reception frequencies are controlled by a microcomputer includes clock means for controlling the microcomputer, count means for counting output signals of the clock means, and a tone for setting a tone frequency for automatically driving a repeater. a frequency setting means; a tone frequency display means for displaying the tone frequency set by the tone frequency setting means; a tone frequency storage means for storing the tone frequency set by the tone frequency setting means; and a tone frequency storage means. a comparison means for determining whether the tone frequency stored in the tone frequency matches the count value of the counting means and resetting the counting means when the count value reaches one value; and a tone signal generation control means for controlling the generation of the tone signal. , a timing signal generation control means which inputs the output signal of the clock means and controls the timing at which a tone signal is generated; an output of the timing signal generation control means; an output of the tone signal generation control means; and an output of the comparison means. and a logical product means for calculating a logical product with the
A tone oscillation circuit comprising: waveform shaping means for approximating the output of the AND means to a sine wave.