| 发明名称 | FM receiver noise reduction | ||
| 摘要 | Apparatus to reduce noise in a stereo FM broadcast received via an antenna, the apparatus comprising: a frequency translator configured to translate the received stereo FM broadcast to an intermediate carrier frequency, a demodulation unit configured to demodulate the translated FM signal so as to form left-plus-right and left-minus-right AM signals, a filter configured to form a filtered signal by filtering one of the AM signals, so as to suppress a sub-band of that signal containing unwanted tones, a summing unit for summing the filtered signal and the other of the left-plus-right and left-minus-right signals to produce a stereo audio signal. | ||
| 申请公布号 | US9203454(B2) | 申请公布日期 | 2015.12.01 |
| 申请号 | US201013510571 | 申请日期 | 2010.11.16 |
| 申请人 | QUALCOMM Technologies International, LTD. | 发明人 | Sharpe Jacob;Popescu Andrei |
| 分类号 | H04B1/16;H04B1/3805;H04B15/06 | 主分类号 | H04B1/16 |
| 代理机构 | The Marbury Law Group, PLLC | 代理人 | The Marbury Law Group, PLLC |
| 主权项 | 1. Apparatus to reduce unwanted signal tones in a stereo frequency-modulation (FM) broadcast received via an antenna, the apparatus comprising: a frequency translator configured to translate the received stereo FM broadcast to an intermediate carrier frequency, a demodulation unit configured to demodulate the translated FM signal so as to form left-plus-right and left-minus-right amplitude-modulation (AM) signals, a filter configured to form a filtered signal by filtering one of the left-plus-right or left-minus-right AM signals to reject a narrow frequency band centered on a frequency of an unwanted tone, so as to suppress a sub-band of the left-plus-right or left-minus-right signal containing the unwanted tone, a summing unit for summing the filtered signal and the other of the left-plus-right and left-minus-right signals to produce a stereo audio signal. | ||
| 地址 | Cambridge GB | ||