Title:
ローカル送受信機のＦＭラジオとの干渉を防止するためのＬＯシフトの使用
Document Type and Number:
Japanese Patent JP5670449
Kind Code:
B2
Abstract:
A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.
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Inventors:
トリクハ、プシュップ・ケー．
ブレスセント、ルカ
リ、シャオヨン
アプテ、ラウル・エー．
ブレスセント、ルカ
リ、シャオヨン
アプテ、ラウル・エー．
Application Number:
JP2012519743A
Publication Date:
February 18, 2015
Filing Date:
July 08, 2010
Export Citation:
Assignee:
クゥアルコム・インコーポレイテッドＱＵＡＬＣＯＭＭ ＩＮＣＯＲＰＯＲＡＴＥＤ
International Classes:
H04B1/10
Attorney, Agent or Firm:
Masatoshi Kurata
Shigeo Takakura
Kono 哲
Makoto Nakamura
Toshihiro Fukuhara
Peak Takashi
Toshiro Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Yukinaga Yasujiro
Naoki Kono
Sunagawa 克
Iseki Mamoru 3
Tatsushi Sato
Okada Kishi
Mihoko Horiuchi
Masanori Takeuchi
Shigeo Takakura
Kono 哲
Makoto Nakamura
Toshihiro Fukuhara
Peak Takashi
Toshiro Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Yukinaga Yasujiro
Naoki Kono
Sunagawa 克
Iseki Mamoru 3
Tatsushi Sato
Okada Kishi
Mihoko Horiuchi
Masanori Takeuchi