Clock generating apparatus

Details Clock generating apparatus Clock generating apparatus

H - Electricity

04

N

352/18.3

H04N 5/95 (2006.01) G11B 20/02 (2006.01) H04N 5/935 (2006.01) H04N 5/956 (2006.01) H04N 9/896 (2006.01)

Patent

CA 2029872

A clock generating apparatus includes a crystal oscillator (1) wherein a clock signal generated from the crystal oscillator (1) passes through a band pass filter (2) to become a reference clock signal of a sine wave, which clock signal is applied to a multiplier (3) and delayed by 1/4 cycle by a 1/4 cycle delayer (4) to become a clock signal cos2.pi.fct, which is applied to a multiplier 5. When an external horizontal synchronizing signal is externally applied, an A/D converter (6) samples the horizontal synchronizing signal in response to a reference clock signal to apply a digital signal to an operating device (7). The operating device (7) operates a phase difference between an absolute phase of the digital signal and a predetermined phase to output a sine wave component sin(a-b) and a cosine wave component cos(a-b) corresponding to the phase difference. The multiplier (3) multiplies the clock signal sin2.pi.fct as a reference by the sine wave component sin(a-b), the multiplier (5) multiplies the cosine clock signal cos2.pi.fct by the cosine wave component cos(a-b) and the multiplication results are added by an adder (9), which addition is binarized by a comparator (12) to output an output clock pulse W.CK.

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