Method and system for detecting signal modes in a broadcast audio transmission
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United States of America Patent
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Nov 25, 2008
Grant Date -
Mar 3, 2005
app pub date -
Aug 15, 2003
filing date -
Aug 15, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A Japanese BTSC audio broadcast signal has three modes of transmission: mono, stereo, or dual mono. The control channel centering at 3.5 fH is one of the three channels in the J-BTSC signal, and contains information to indicate to the decoder which one of the three modes the audio transmission is in. The present invention uses a bandpass filter directly in the AM band, followed by envelope filtering and a decision circuit. Therefore, the need for AM demodulation and AM carrier detection is eliminated.
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