JPS59122224A - Synchronizing pulse detector - Google Patents

Abstract

PURPOSE:To manufacture a small-sized, accurate and unexpensive synchronizing pulse detector by using a dispersion type delay line for the separation of a synchronizing pulse. CONSTITUTION:A high frequency pulse inputted to an input terminal 101 is applied to the dispersion type delay line 103 through an error detection preventing switch 102. A high frequency signal (a) inputted to the dispersion type delay line 103 and having pulse-modulated different frequency f1, f2 is delayed by T1, T2 and outputted, so that the frequency components f1, f2 are separated in accordance with time. A pulse analysing circuit 104 counts up pulse-like high frequency signals generated correspondingly to the frequency separated with time to decide a synchronizing pulse with two waves. The titled detector can be also applied to a device detecting synchronizing pulses having N different frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a synchronization pulse detection method that detects a synchronization pulse by efficiently and quickly separating a high frequency signal pulse-modulated by PAL No. 718 having a constant period and having different frequency components into each frequency component. It is related to the device.

The configuration of this type of device that has been commonly used in the past is 41
This will be explained according to the diagram. In Figure 1, (11) to (N1) are band pass filters, (12) to (N2) are detectors that detect the outputs of these band pass filters (11) to (N1), respectively, and (1) is this detection. The state of the detection output of the detectors (12) to (N2) is judged, and whether it is a synchronization pulse or not is determined by -1 (fi
l? The synchronization pulse detection time d, (100) is an input terminal.

Next, I will explain about IIIJ's works. The input terminal in Figure 1 (
100), pulse-modulated high-frequency signals with different frequency components, and a band-pass filter (
11) Applicable passband among (N1)? It is designed to pass through things. Therefore, the first wave number is fl
, fz, and when the frequency of Katsukore et al. is not covered by the pass band of the 1 d bandpass filter, it is shown in Figure 2 (←) and (C).
As shown in Fig. 1, the pulse from the corresponding inverter is fg f2
1 is output separately corresponding to . Since there is a 1:1 correspondence between the signal 1 frequency difference and the filter, by counting the difference in the output pulse, it is possible to detect how many frequency components the high frequency has.

Since the conventional synchronous pulse detection circuit is configured as described above, in order to detect the synchronous pulse with high accuracy (for example, in bultz units), the band pass filter shown in Fig. 1 is used. (11) ~ (Nl)
And the precepts of the detectors (12) to (N2) in Figure 1 must be kept in mind. B) In the case of 1), in the conventional synchronous pulse detection circuit, it is desirable to increase the number of band pass filters and waveforms, which has the disadvantage of being large in size and difficult to manufacture.

This generation 8A was developed to eliminate the drawbacks of the conventional ones as described above, and by using a distributed delay line to separate the synchronous pulses, it is a synchronous pulse detection circuit that can be manufactured in a small size, with high precision, and at a low cost. is intended to provide.

An embodiment of the present invention will be described below with reference to FIG. In the figure, (101) is the input terminal of this device, (102) is the switch, and the high-frequency pulse that is manually applied to the input terminal (101) passes through the switch (102) and is directly connected to the input terminal (101). (103) is a distributed delay line that disconnects the following circuit for a predetermined period of time, and the passage (delay) time is determined according to the frequency of each of the different pulse-modulated high frequencies manually generated. What to decide 1.1
04) is a pulse analysis circuit, IJr said distributed type, +
! ! The output pulses of the wire extension (103) are counted, and based on the counted number, a manually generated high-frequency wave instantly determines whether one wave is multiple waves.

Distributed delay line (103) K Input pulse-modulated high-frequency signals with different frequencies (referred to as fxXfz) 1 and 0 pass through the distributed delay line (103) having the human output characteristics shown in Figure 4. The high frequencies of 1, fl, and f2 are output after being delayed by Tz=F(ft) and T2=F(f2), respectively (FIG. 5). That is, as shown in FIG. 5, from the high frequency signal 8 (FIG. 5 (a)) inputted to the input terminal (101) VC, the signals are outputted from the distributed delay line (1) with a delay of time Tl and T2, respectively. fl and f2 are separated in time. The pulse analysis circuit (2) counts the pulsed high-frequency signals (see Figure 3 (c)) generated corresponding to these temporally separated frequencies, and in this case, the synchronized pulse of r/'i two waves is detected. determine that it is.

FIG. 5(b) shows the operating time of the switch (102).

Distributed delay # (10
3) to prevent false detection due to signals other than the predetermined signals.

The output of the distributed delay line (103) is detected by a pulse analysis circuit and stored and processed to detect which frequency is a synchronous signal.

In this embodiment, only two waves have been described, but a similar effect can be achieved in a device that detects synchronization pulses having different frequencies of N1.

As described above, according to the present invention, since the distributed delay line is used, the synchronization pulse 1111 can be easily and quickly produced, and the apparatus can be made inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a conventional synchronous pulse detection device, FIG. 2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a diagram showing an embodiment of the present invention, and FIG.
Figure 5 is an explanatory diagram of the human output characteristics of the zero-dispersed delay line. In the figure, (101) is an input terminal for manually input high-frequency signals with different frequency components, and (102) is an input terminal (101) for inputting high-frequency signals having different frequency components.
) and the subsequent distributed delay line (103) at a predetermined timing, and (1o4) is a synchronous pulse detection circuit. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A distributed delay line that delays pulse-modulated high-frequency signals having different frequency components at different times for each frequency component in a device for detecting synchronization signals using pulse-modulated modulated wave signals having different frequency components; It has a synchronization detection circuit that extracts pulse No. 718 from the output signal of the distributed delay line and determines whether it is a synchronization pulse or not, and a switch that uses a human input signal for a predetermined period of time from the time when a predetermined input signal falls. A synchronous pulse detection device characterized by: