Telecommunications – Receiver or analog modulated signal frequency converter – Convertible to different type
Patent
1997-10-23
1999-01-26
Cumming, William
Telecommunications
Receiver or analog modulated signal frequency converter
Convertible to different type
4551831, 455266, 455307, H04Q 732
Patent
active
058647503
ABSTRACT:
A microcomputer in a radio frequency (RF) signal receiver, such as a cordless telephone set, periodically samples a received baseband audio signal to determine its frequency content. The microcomputer uses at least one predetermined frequency threshold value, and determines that the RF signal is present if the output signal contains signals no higher in frequency the frequency threshold value, and determines that the RF signal is absent if the output signal contains signals higher in frequency than the frequency threshold value. The circuit is useful in either a base unit or a handunit of a cordless telephone set.
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IEEE Int. Conf. On Consumer Electronics, Jun. 8, 1990, Rosemount, IL, USA, pp. 30-31, Suzuki et al., "Development of a car radio diversity system IC using the noise count system".
Fossaceca John Mark
McCarthy Dennis Ronald
Cumming William
Emanuel Peter M.
Liao Frank Y.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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