Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1991-01-24
1992-08-04
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 23, H04N 966, H04N 1704
Patent
active
051363682
ABSTRACT:
In a new television signal decoder architecture, a mixer switches between two inputs, A and B, using an envelope function C, according to the relationship: Ouput=A*C+B(1-C), where A is either the composite television signal input in normal operation or a first test signal memory in test signal generation operation, and B is either a fixed blanking level in normal operation or a second test signal memory in test signal generation operation. A test signal generator and blanking sequencer provides the test signals to the two test signal memories and an envelope control signal to the envelope generator telling it when and in which direction to supply the transition envelope to the mixer. A variable electrical length front end is created by a microprocessor that recalls from its memory the timing associated with a particular composite video source and directs a timing circuit to wait an appropriate amount of time before releasing a frame of video stored in a FIFO buffer memory to the rest of the decoder. A bus is shared by sync signals and signals from diagnostic points of interest and is alternatively controlled by the sync generation circuitry during normal operation and the microprocessor during diagnostics.
REFERENCES:
patent: 4743958 (1988-05-01), Bannister et al.
patent: 4821269 (1989-04-01), Jackson et al.
patent: 5008740 (1991-04-01), Phillips et al.
Groody James J.
Powell Mark R.
Smith-Hill John
The Grass Valley Group Inc.
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