Noise removal device

摘要

It is an object of the present invention to provide an improved noise removal device having an improved noise removal precision. A second noise extracting unit (16) extracts a noise of an IF signal (Sinb), and outputs a secondnoise signal (Snzb) which is then smoothed by a second noise smoothing unit (17) to produce a second noise-smoothed signal (Sdcb). A noise hold control signal generating unit (18) compares the second noise-smoothed signal (Sdcb) with the second noise signal (Snzb) to produce a noise hold control signal (Shb) indicating an occurring position and an occurring period of the noise of the IF signal (Sinb). A first noise extracting unit (12) extracts a noise of an FM detection signal (Sina), and outputs a first noise signal (Snza). A noise hold unit (13) holds the first noise signal (Snza) in accordance with the noise hold control signal (Shb) to produce a held noise signal (Shnza) which is then smoothed by a first noise smoothing unit (14) to produce a first noise-smoothed signal (Sdca). A hold control signal generating unit (15) compares the first noise-smoothed signal (Sdca) with the first noise signal (Snza) to produce a hold control signal (Sha) indicating an occurring position and an occurring period of the noise of the FM detection signal (Sina). Subsequently, a hold unit (11) operates to hold the FM detection signal (Sina) in accordance with the hold control signal (Sha), thereby generating and thus outputting an FM detection signal (Sout) not containing any noise.