Noise canceller and AM receiving apparatus using the same

Pulse or digital communications – Receivers – Interference or noise reduction

Reexamination Certificate

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Details

C455S296000

Reexamination Certificate

active

07835477

ABSTRACT:
A noise canceller that a receiving signal received by a receiving antenna is input to, the noise canceller removing a pulse noise superimposed on the receiving signal to output the signal, the noise canceller comprising: a pulse noise detecting unit that detects the pulse noise superimposed on the receiving signal; a reception level detecting unit that detects the level of the receiving signal; a level hold unit that is triggered by the detection of the pulse noise with the pulse noise detecting unit to hold the level of the receiving signal in a process on the preceding stage of the output; and a level hold period setting unit that sets the level hold period when the level is held in the level hold unit in accordance with the level of the receiving signal detected by the reception level detecting unit.

REFERENCES:
patent: 4370522 (1983-01-01), Takeda et al.
patent: 4704642 (1987-11-01), Namiki
patent: 5303415 (1994-04-01), Takayama et al.
patent: 6993309 (2006-01-01), Tsujishita et al.
patent: 2005/0143109 (2005-06-01), Ohashi
patent: 2005/0153674 (2005-07-01), Suganuma
patent: 06-112853 (1994-04-01), None

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