Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1992-07-14
1994-02-08
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
328162, 328163, 455303, 4552351, H03B 100, H04B 110
Patent
active
052851656
ABSTRACT:
The present invention relates to a method for eliminating noise in a signal. The frequency band of the signal is divided into sub-bands, whereafter the useful value of the signal of each sub-band is determined by comparing the signal level to a reference level, in which case a constant signal of substantially the same level as the reference level is suppressed as noise and a varying signal, defined as a useful signal, is combined, unsuppressed, with the useful signals of the other sub-bands. The frequency band of the channel is divided into sub-bands by means of an all-pass filter construction. The method can be implemented using an analog or a digital filter construction.
REFERENCES:
patent: 3649922 (1972-03-01), Ralph et al.
patent: 3699461 (1972-10-01), Huntsinger
patent: 3731188 (1973-05-01), Smith
patent: 3857104 (1974-12-01), Sacks
patent: 4604755 (1986-08-01), Murray
Makinen Jorma J.
Neuvo Yrjo A. O.
Rapeli Juha
Renfors Markku K.
Tenhunen Aarne H. K.
Sikes William L.
Tran Toan
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