Electrical audio signal processing systems and devices – Noise or distortion suppression
Reexamination Certificate
2006-04-25
2006-04-25
Chin, Vivian (Department: 2644)
Electrical audio signal processing systems and devices
Noise or distortion suppression
C381S094500, C381S094700, C381S094800
Reexamination Certificate
active
07035417
ABSTRACT:
A noise reduction system is connected to at least two input channels for receiving input signals that have substantially identical program content but differing instantaneous noise transients. The system selects a filtered input signal that has the lowest instantaneous noise transient level. In another aspect, the noise reduction system removes instantaneous transient noise from an input signal by way of a blanker. The blanker includes a switch that opens whenever a band-pass filtered input signal is greater than the average level of the signal by a predetermined proportional amount. The input signal also includes continuous noise that is removed by a continuous noise suppressor. The continuous noise is removed by a low pass filter whose corner frequency is responsive to a differentiated input signal divided by the program component signal, or vice versa. In another aspect, the noise reduction system includes at least two of a switcher, blanker or continuous noise suppressor in connected in series to remove both instantaneous noise transients and continuous noise from an input signal.
REFERENCES:
patent: 4095191 (1978-06-01), Shibuya
patent: 4155041 (1979-05-01), Burns et al.
patent: 4322641 (1982-03-01), Packard
patent: 5303415 (1994-04-01), Takayama et al.
patent: 6859540 (2005-02-01), Takenaka
M.M. Driscoll IEEE Paper 0-7803-3309-8/96 1996.
Chin Vivian
Flanders Andrew C.
LandOfFree
System for reducing noise in the reproduction of recorded... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for reducing noise in the reproduction of recorded..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for reducing noise in the reproduction of recorded... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3534300