发明名称 |
FM/FMX STEREOPHONIC RECEIVER |
摘要 |
An FM/FMX stereophonic receiver is capable of receiving an FM or an FMX stereophonic broadcast signal. The FM stereophonic broadcast signal includes a stereo sum signal and stereo difference signal, whereas the FMX stereophonic broadcast signal further includes a compressed stereo difference signal and an FMX ID signal indicating the FMX stereophonic broadcast signal. The FM/FMX stereophonic receiver has a stereo demodulator for receiving said broadcast signal and for producing left and right stereo signals, a detector for detecting the field strength of the receiving signal, and a noise reducer, which may be a circuit for changing the mode from stereophonic mode to monaural mode or a high cut circuit for attenuating the signals of high frequency region, for reducing noise signals contained in the left and right stereo signals. The FM/FMX stereophonic receiver further has a detector for detecting the FMX ID signal and a disabling circuit for disabling the noise reducer when the FMX ID signal is detected by the detector. Instead of the disabling circuit, a timing control circuit may be provided for changing the timing at which the noise reducer starts to activate in response to the detection of the FMX ID signal.
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申请公布号 |
CA1326263(C) |
申请公布日期 |
1994.01.18 |
申请号 |
CA19880559410 |
申请日期 |
1988.02.19 |
申请人 |
SANYO ELECTRIC CO., LTD. |
发明人 |
USUI, NOBORU;TANAKA, KANJI;OGAWA, RYUICHI;ISHIKAWA, TSUTOMU;ISHIGURO, KAZUHISA;ARAI, MASASHI |
分类号 |
H04B1/16;(IPC1-7):H04B1/16 |
主分类号 |
H04B1/16 |
代理机构 |
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地址 |
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