发明名称 |
Method and apparatus for improving the quality of AM compatible digital broadcast system signals in the presence of distortion |
摘要 |
A system and method are provided for reducing perceived distortion in an output audio signal derived from an amplitude modulated compatible digital broadcast signal having a monophonic portion and a stereo portion. The stereo portion of this signal is demodulated to produce a demodulated stereo signal and the monophonic portion of the signal is demodulated to produce a demodulated monophonic signal. The noise in the demodulated stereo signal is measured and an estimate of the signal-to-noise ratio is derived. This estimated signal-to-noise ratio is compared with a threshold level which is set at the minimum acceptable signal quality for the stereo signal. Based upon the estimated signal-to-noise ratio, a switch directs either the monophonic derived audio output or the stereo derived audio output as the system output signal.
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申请公布号 |
US5703954(A) |
申请公布日期 |
1997.12.30 |
申请号 |
US19960604199 |
申请日期 |
1996.02.20 |
申请人 |
USA DIGITAL RADIO PARTNERS, L.P. |
发明人 |
DAPPER, MARK J.;CARLIN, BARRY W.;GEILE, MICHAEL J. |
分类号 |
H04H20/26;H04H20/33;H04H40/18;(IPC1-7):H04H5/00 |
主分类号 |
H04H20/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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