Two-dimensional noise shaping filter circuit

Details Two-dimensional noise shaping filter circuit Two-dimensional noise shaping filter circuit

1992-12-07

1995-02-07

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Combined noise reduction and transition sharpening

348607, 348625, H04N 521

Patent

active

053880811

ABSTRACT:
A two-dimensional noise shaping filter circuit including a first adder for adding a feedback signal to the input signal A quantizer is provided for quantizing an output from the first adder. A second adder adds an output from the quantizer to the output from the first adder. A transfer function unit provides an output from the second adder with a two-dimensional transfer function so as to generate the feedback signal to be supplied to the first adder. Using the noise shaping filter circuit, it becomes possible to provide a video signal with a two-dimensional noise shaping process, not only for a present line but also for a preceding line and a succeeding line. White noises caused by the quantizing process can be moved towards corners of a square Brillouin zone. Noise levels can be decreased at desired locations, such as at a portion of the center of a screen having a lower spatial frequency.

REFERENCES:
patent: 4953026 (1990-08-01), Kobayashi et al.
patent: 5018010 (1991-05-01), Masumoto
patent: 5124703 (1992-06-01), Kaneaki et al.
patent: 5144306 (1992-09-01), Masuda
O Plus E, No. 60, pp. 90-98, inclusive (Nov. 1984) (Japanese document).
O Plus E, No. 61, pp. 95-100, inclusive (Dec. 1984) (Japanese document).
120/140 MBPS Intrafield DPCM System For Digital Transmission of HDTV Programs, 2nd Intl. Workshop on Signal Processing of HDTV, Feb. 29-Mar. 1988, L'Aquita, Italy.

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