发明授权
US5809065A Method and apparatus for improving the quality of AM compatible digital
broadcast system signals in the presence of distortion
失效
用于在存在失真的情况下提高AM兼容的数字广播系统信号的质量的方法和装置
- 专利标题： Method and apparatus for improving the quality of AM compatible digital broadcast system signals in the presence of distortion
- 专利标题（中）： 用于在存在失真的情况下提高AM兼容的数字广播系统信号的质量的方法和装置
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申请号： US603768申请日： 1996-02-20
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公开(公告)号： US5809065A公开(公告)日： 1998-09-15
- 发明人: Mark J. Dapper , Barry W. Carlin , Michael J. Geile
- 申请人： Mark J. Dapper , Barry W. Carlin , Michael J. Geile
- 申请人地址： NY New York
- 专利权人： USA Digital Radio Partners, L.P.
- 当前专利权人： USA Digital Radio Partners, L.P.
- 当前专利权人地址： NY New York
- 主分类号： H03D5/00
- IPC分类号： H03D5/00 ; H04H20/36 ; H04L1/20 ; H04L27/00 ; H04L25/00
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 an analog portion and a digital portion. The digital portion of this signal is demodulated to produce a demodulated digital signal and the analog portion of the signal is demodulated to produce a demodulated analog signal. The noise in the demodulated digital 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 digital signal. Based upon the estimated signal-to-noise ratio, a switch directs either the analog derived audio output or the digitally derived audio output as the system output signal.
公开/授权文献
- US5113106A Brush holder for an electrical commutating machine 公开/授权日：1992-05-12
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