Reduced data rate comb filter system

Details Reduced data rate comb filter system Reduced data rate comb filter system

1982-08-04

1984-06-26

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

044569220

ABSTRACT:
Comb filter arrangements are provided for separating frequency interleaved signal components of a video signal. A video signal is sampled at a rate which satisfies the Nyquist criterion for the bandwidth of the signal, and the resultant signal samples are applied to a bandpass filter. The bandpass filter produces a filtered signal restricted to a portion of the original video band. The filtered signal is subsampled at a rate which satisfies the Nyquist criterion for the information of the restricted passband, producing replicas of the restricted passband beginning approximately at zero Hertz and extending upward in frequency about frequencies which are multiples of the subsampling frequency and its harmonics. The subsampled information in the replicated passbands is comb filtered, and the comb filtered signals are interpolated up to the original sampling rate of the video signal. The comb filtered and interpolated signals are applied to a second bandpass filter exhibiting substantially the same passband as the first bandpass filter. The signals produced by the second bandpass filter are then combined in time alignment with samples of the original video signal to produce a second comb filtered signal.

REFERENCES:
patent: 3858240 (1974-12-01), Golding et al.
patent: 4322739 (1982-03-01), Drewery et al.
patent: 4400718 (1983-03-01), Lee
"Sub-Nyquist-Encoded PCM NTSC Color Television" by John P. Rossi, pub. in Jan. 1976, SMPTE Journal, vol. 85, No. 1.
"A Discussion of Sampling Theorems" by D. A. Linden, pub. in Jul. 1959, Proceedings of the IRE.
"Digivision" ITT Semiconductor Development Data, Aug. 1982.
T. Fischer, "What is the Impact of Digital TV", IEEE Transactions on Consumer Electronics, vol. CE-28, No. 3, Aug. 1982, pp. 423-429.
Exhibit "A", Digit 2000 VLSI Digital TV System, ITT Semiconductor, (Confidential).

Affiliated with

Also associated with

Rating

Reduced data rate comb filter system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduced data rate comb filter system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduced data rate comb filter system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2234705