Time expansion of pulse width modulation sequences by clock drop

Details Time expansion of pulse width modulation sequences by clock drop Time expansion of pulse width modulation sequences by clock drop

1998-05-11

1999-06-15

Nguyen, Matthew

Television

Format

Including pulse modulation of video signal

H04N 724

Patent

active

059127120

ABSTRACT:
A method for expanding pulse width modulation sequences that control a display system to adapt to varying video frame times. A minimal amount of extra circuitry (10) is provided that regulates a sequencer (26). After calculating the appropriate expansion factor needed to stretch a base sequence, the system control circuit (22) sends that information to the circuitry (10). The circuitry (10) includes a counter (14) that repetitively counts down a number of clock cycles and causes the clock to drop a cycle. This dropping of clock cycles causes the sequence time to be expanded, as it takes the system longer to reach the necessary number of clock cycles that determine a sequence. Several base pulse width modulation sequences could be stored in memory, each of which can be used for a range of frame times, eliminating the need for one sequence for every possible variation in the frame time.

REFERENCES:
patent: 4189669 (1980-02-01), Van Loon et al.
patent: 4236114 (1980-11-01), Sasaki
patent: 5764165 (1998-06-01), Buch
patent: 5812595 (1998-09-01), Jandu

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