TV receiver including multistandard OSD

Details TV receiver including multistandard OSD TV receiver including multistandard OSD

1989-04-20

1990-10-09

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358140, 358 22, 358183, H04N 544, H04N 5272, H04N 701, H04N 974

Patent

active

049624270

ABSTRACT:
A television receiver including a MPU and OSD circuitry on a single chip. The OSD circuitry includes multisystem detection circuitry which counts the number of horizontal lines between vertical flyback pulses to determine the vertical frequency of the received standard signal and measures the time of a horizontal line using a fixed frequency signal to determine the horizontal frequency of the received standard signal and uses this information to control the outputs of a PLL to synchronize the receiver to the received standard. The PLL includes a VCO having a constant offset current applied to the control terminal to prevent alternating phases of the output control signal from the loop phase detector, which alternating phases cause jitter in the display.

REFERENCES:
patent: 4607236 (1986-08-01), LeQueau
patent: 4661844 (1987-04-01), Rufray et al.
patent: 4682209 (1987-07-01), Nillesen
patent: 4802009 (1989-01-01), Hartmeier
patent: 4816908 (1989-03-01), Colineau et al.

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