Pulse noise detecting circuit of am receiver
Номер патента: CA2081353C
Опубликовано: 02-02-1999
Автор(ы): Hirokazu Matsunaga, Kazuo Takayama
Принадлежит: Denso Ten Ltd
Опубликовано: 02-02-1999
Автор(ы): Hirokazu Matsunaga, Kazuo Takayama
Принадлежит: Denso Ten Ltd
Реферат: The present invention is intended to detect pulse noise entering an AM receiver in order to improve the freedom in construction and prevent erroneous operation. It provides a pulse noise detecting circuit in an AM receiver having an envelope detecting portion (108) that performs envelope detection on an intermediate frequency signal and outputs a gate signal for removing a pulse noise signal mixed in an output signal of the envelope detecting portion including a high pass filter (31) that blocks the envelope detection signal from the envelope detecting portion (108) and extracts the pulse noise signal, an amplifier (32) that amplifies the extracted pulse noise, a level detecting portion (33) that detects the level of the amplified pulse noise signal and outputs the gate signal when the level is a predetermined value, and a second band filter (34) that extracts the envelope detection signal and adjusts the smoothed amplification to make the level of the pulse noise signal constant.
Pulse noise detecting circuit of AM receiver
Номер патента: US5303415A. Автор: Kazuo Takayama,Hirokazu Matsunaga. Владелец: Denso Ten Ltd. Дата публикации: 1994-04-12.