JPS62112435A - Signal decoder - Google Patents

Abstract

PURPOSE:To simplify a decoder and to miniaturize a logic circuit by providing a multivibrator circuit generating a delay signal of an output signal of a waveform shaping circuit and a decoding circuit reproducing a pulse signal at each transmission period and generating AND of delay signals. CONSTITUTION:Three synchronizing pulse signals in a remote transmission signal are inputted to the waveform shaping circuit 21 from an input terminal 111. The output pulse signal of the multivibrator circuit 22 and the output signal of the waveform shaping circuit 21 are inputted to an AND circuit 25, where AND operation is applied and the presence of the pulse signal is discriminated and the discrimination signal is outputted to the multivibrator circuit 23 of the next stage. The circuit 23 uses the discrimination signal of the AND circuit 25 to generate a pulse signal similarly as the circuit 22 and the signal is outputted to the AND circuit 26 of the next stage. The AND circuit 26 uses the output signal of the circuit 23 and the output signal of the circuit 21 to output the discrimination signal similarly as the AND circuit 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decoder for synchronized pulse signals of signals remotely transmitted from a radar device.

[Conventional technology]

When remotely transmitting a received video signal from a radar device to a control room, a remote transmission signal is used in which a synchronization pulse signal for each transmission period and a received video signal are time-divisionally processed and combined into a single signal. In radar equipment, the synchronization pulse signal among the remote transmission signals is made into a multiple pulse signal by delaying the synchronization pulse for each transmission cycle by several μsec to prevent malfunction due to external noise on the transmission path. After being sent out to the transmission line, the decoder in the control room repeats the delay of multiple pulse signals for each pulse time interval by the number of pulses, and takes the logical loss of each delayed signal. The synchronized pulse signal is fully regenerated. Signals due to foreign noise cannot be output when logical losses are taken. Conventionally, signal decoders for remotely transmitted signals have consisted of a signal delay circuit that uses a delay line using reactance and capacitance, a level conversion circuit that increases the signal level that has decreased in the delay circuit, and a logical product of the delayed signals. The synchronizing pulse signal 'ft was regenerated by the AND circuit.

[Problem that the invention seeks to solve]

When a delay line is used to delay a pulse signal.

The pulse interval of the synchronization pulse signal sent out by the radar device is several microseconds, and in order to reduce the signal level attenuation in the delay line, it is necessary to perform amplification, level adjustment, etc., and the size of the delay line becomes large. .

Furthermore, when changing the pulse interval of a plurality of synchronized pulse signals in a transmission signal.

The drawback is that it is necessary to prepare output taps according to needs in advance.

[Means to solve all problems]

As shown in FIG. 1, the decoder of the present invention includes a waveform shaping circuit 3 that inputs a plurality of pulse signals in a remote transmission signal from a radar device and shapes the waveform using clock pulses, and a monostable multivibrator all in series. Alternatively, it has a multivibrator circuit 4 which is connected in parallel to generate a delayed signal of the output signal of the waveform shaping circuit 3, and a decoding circuit 5 which performs ANDing of the delayed signals and reproduces a synchronized pulse signal for each transmission cycle. There is.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 2 is a block diagram of a three-valve signal decoder which is an embodiment of the present invention.

A three-pulse synchronization signal in the remote transmission signal is input from the input terminal 11 to the waveform shaping circuit 21. Another clock pulse for periodic processing is input to the waveform shaping circuit 21 through the input terminal 12f, and the timing of the three-pulse synchronization signal is converted by the clock pulse.
It becomes a 3-pulse signal synchronized with the clock pulse, and the primary stage multivibrator circuit 22 and AND circuit 25.2fi
, 27.

The multi-vibration circuit 22 is a monostable multivibrator that outputs a full pulse signal of a predetermined time length using a variable or fixed resistor and capacitance. The output pulse signal of the multivibrator circuit 22 and the output signal of the waveform shaping circuit 21 are input to the AND circuit 25, where the AND operation is performed to determine the presence or absence of the pulse signal, and the determination signal - is sent to the next stage. It is outputted to the multivibrator circuit 23 of. The multivibrator circuit 23 generates a pulse signal based on the determination signal from the AND circuit 25, similar to the multivalator circuit 22, and outputs it to the AND circuit 26 at the next stage. The AND circuit 26 is the multivibrator circuit 2
3 and the output signal of the waveform shaping circuit 21,
Similar to the AND circuit 25, all judgment signals are output. The multivibrator circuit 24 and the AND circuit 27 perform the same operation as the multivibrator circuit 23 and the AND circuit 26, and the final judgment signal is outputted from the AND circuit 27.

The final judgment signal is input to the waveform circuit 28 at the next stage, and the pulses of the signal are adjusted and outputted to the output terminal 13.

〔Effect of the invention〕

As explained above, by using a monostable multivibrator, the present invention can realize all the delays with only a logic circuit, and by making the resistor of the monostable multivibrator variable, it can be easily achieved. Not only can a decoder be created that can handle pulse signals with different pulse intervals, but logic circuits can also be integrated, making them much smaller and lighter than delay lines.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of the present invention, and FIG. 2 is a configuration diagram of a three-pulse signal decoder according to an embodiment. 1.11.12...Input terminal, 2,13...
... Output terminal, 3, 21, 28 ... Waveform shaping circuit, 5 ... Decoding circuit, 4, 22, 23.24
・・・・・・Multi-vibrator circuit, 25.26.2
7...Logic product circuit.

Claims (1)

[Claims] A waveform shaping circuit that inputs a synchronization pulse signal in a transmission signal and shapes the waveform using a clock pulse for periodic processing, a multivibrator circuit that generates a delayed signal of the output signal of the waveform shaping circuit, and a delayed signal. A signal decoder comprising a decoding circuit that generates a logical product of and reproduces a pulse signal for each transmission period.