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Horizontal synchronizing signal separation circuit
| Details |
Inventors: Okada, Hisao; Tanaka, Kuniaki; Uehira, Shigeyuki;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Groody; James J.
Assistant Examiner: Hsia; Sherrie
Attorney, Agent or Firm:
In a horizontal synchronizing signal separation circuit, from a composite synchronizing signal which includes a horizontal synchronizing signal and a vertical synchronizing signal, a detection signal indicative of detection of a rising edge of the composite synchronizing signal is generated. A gate is provided through which the detection signal is passed in accordance with a control signal. The control signal is a pulse signal having a predetermined pulse width, which is generated by a circuit to which the output of the gate is input. The output of the gate is also supplied to another circuit which generates a separated horizontal synchronizing signal. |
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DETAILED DESCRIPTION The horizontal synchronizing signal separation circuit of this invention, which overcomes the above-discussed and numerous other disadvantages and deficiencies of the prior art, includes detection means for receiving a composite synchronizing signal which includes a horizontal synchronizing signal and a vertical synchronizing signal, and for generating a detection signal through an output, the detection signal being indicative of detection of a rising edge of the composite synchronizing signal; gate means, coupled to the output of the detection means, for receiving a control signal, and for passing the detection signal in accordance with the control signal; control signal generation means, coupled to an output of the gate means, for generating a pulse signal in accordance with the output of the gate means, the pulse signal having a predetermined pulse width and being supplied to the gate means as the control signal; and pulse signal generation means, coupled to the output of the gate means, for generating a further pulse signal which rises substantially at the timing when the detection signal passes the gate means, the further pulse signal being output as a separated horizontal synchronizing signal.
Preferably, the predetermined pulse width is longer than a half of one horizontal scanning period and shorter than one horizontal scanning period.
In a preferred embodiment, the control signal generation means includes a monostable multivibrator.
In a preferred embodiment, the control signal generation means further includes an inverter which is connected to an output of the multivibrator, the output of the inverter being output as the control signal.
In a preferred embodiment, the pulse signal generation means includes a monostable multivibrator.
Thus, the invention described herein makes possible the objective of providing a horizontal sync signal separation circuit which can correctly extract the timing of a horizontal sync signal from a composite sync signal.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter
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Exercise Devices 
