Digital sub-systems and building blocks for a mostly digital low-cost BTSC compatible encoder
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United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Jan 14, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A BTSC-compatible encoder that is integrated onto an application specific integrated circuit includes a low pass filter that is responsive to a digital representation of an audio signal that has a sample rate of F.sub.S. The low pass filter generates a corresponding second digital signal having an pseudo-interpolated sampling rate of 4F.sub.S. A digital infinite impulse response pre-emphasis filter generates a pre-emphasized output signal corresponding to the second digital signal. A digital signal compressor that is responsive to the pre-emphasized output signal, generates a compressed digital signal corresponding to the pre-emphasized output signal. A digital phase locked loop that is responsive to a video sync pulse having a sync pulse frequency, generates a third digital signal corresponding to a sinusoid having a frequency equal to twice the sync pulse frequency and a having a sampling frequency equal to 4F.sub.S. A first digital multiplier multiplies the compressed digital signal by the third digital signal, thereby generating a digital BTSC-compatible stereo television difference signal.
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