Line synchronizing circuit

Details Line synchronizing circuit Line synchronizing circuit

1992-02-26

1993-10-05

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 505

Patent

active

052510328

ABSTRACT:
A line synchronizing circuit in a picture display device includes a phase discriminator, a loop filter and a line oscillator constituting a control loop for controlling the frequency and/or the phase of the oscillator signal. To reduce the phase error, which occurs after a phase jump in the incoming signal, and to reduce the time in which the error is visible, the loop filter has a first part for supplying a first control signal having a first response time and a second part for supplying a second control signal having a second response time which is shorter than the first response time. The two parts of the loop filter are coupled to the control input of the line oscillator. A switching apparatus selectively couples two parts or the second part, of the loop filter to the output of the phase discriminator.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4758801 (1988-07-01), Draxelmayr
patent: 5060066 (1991-10-01), Roberts
Josefsberg, Yekutiel "Stable and Fast PLL Switches Loop Bandwidths" Electronics (Mar. 10, 1982) p. 139, vol. 55, No. 5.

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