Digital audio waveform display on a video waveform display instr

Details Digital audio waveform display on a video waveform display instr Digital audio waveform display on a video waveform display instr

1994-07-19

1996-01-16

Kostak, Victor R.

Television

Monitoring, testing, or measuring

348564, H04N 1704

Patent

active

054851998

ABSTRACT:
A digital audio waveform display is presented on a digital video waveform display instrument using the video waveform display circuitry. A decoder extracts embedded digital audio data from a digital video signal. The digital audio data is stored in a buffer memory. N digital audio data words, corresponding to N samples of the video data representing a video line for display, are read from the buffer memory at a video sample rate and input to the video waveform display circuitry. The video waveform display circuitry includes a digital to analog converter operating at the video sample rate and an analog video reconstruction filter which provides amplitude values for a swept display device.

REFERENCES:
patent: 4149189 (1979-04-01), Nagai
patent: 4685065 (1987-08-01), Braun et al.
patent: 4691358 (1987-09-01), Bradford
patent: 4963967 (1990-10-01), Orland et al.
patent: 5225909 (1993-07-01), Koizumi
patent: 5339110 (1994-08-01), Hava

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