H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/86
H04N 5/04 (2006.01) H04N 5/12 (2006.01)
Patent
CA 1124849
VERTICAL SYNCHRONIZATION SYSTEM ABSTRACT OF THE DISCLOSURE A two-mode digital vertical synchronization system is described for controlling the phase synchroniza- tion of vertical scan in a television receiver. In one mode, the system searches for incoming vertical sync pulses which occur during a wide sync "window". Sync pulses received during that window are utilized to initiate vertical scan. When the received sync pulses are in time- coincidence with an internal control signal generated at a standard line/frame rate, the system switches to a narrow window mode of operation. Vertical sync pulses received during a narrow sync window continue to initiate vertical scan. When a lack of time-coincidence between received vertical sync pulses and the control signal occurs for a predetermined interval, the system reverts to its wide window mode. Preferably, the locally generate control signal has a time duration sufficient to permit detection of coincidence between itself and a typical non-standard vertical sync pulse to hold the system in the narrow window mode, thus preventing oscillation between the narrow and wide window modes.
347862
Macrae & Co.
Zenith Radio Corporation
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