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Noise reducing apparatus and methods for television receivers
| Details |
Inventors: Harford, Jack R.;
Assignee: Samsung Electronics Co., Ltd. (Suwon, KR)
Primary Examiner: Groody; James J.
Assistant Examiner: Murrell; Jeffrey S.
Attorney, Agent or Firm: Limberg; Allen LeRoy, Westerlund; Robert A., Whitt; Stephen R.
A high-performance television receiver synchronously detects the picture IF signal. A synchronous impulse noise in the IF signal generates either positive-going noise or negative-going noise in the video signal supplied from a synchronous video detector, which noise is subsequently replaced by a value of video signal occurring previous to the impulse noise in the following manner. The video signal contaminated with impulse noise is supplied as input signal both to an impulse noise detector and to a delay line. The output signal from the delay line, delayed by about 240 ns, is supplied as the signal for tracking by a track-and-hold circuit. The detected impulse noise signal is used to actuate the hold condition in the track-and-hold circuit. By stretching the pulse from the impulse noise detector for the 600-800 ns duration overlapping the duration of most impulse noise, the track-and-hold circuit replaces most impulse noise with previously stored values of the delayed video signal. This not only generally avoids the appearance of white impulse noise and ensuing black impulse noise in the televised picture, but avoids the application of impulse noise to the chroma channel receiving synchronously detected video signal as its input signal. Shock excitation of the chroma channel is accordingly avoided, so chroma "twinkle" does not appear in the televised picture. |
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DETAILED DESCRIPTION The invention is embodied in a principal one of its aspects in a television system including a source of an intermediate frequency (IF) signal comprising an IF picture carrier amplitude modulated with video information; a video detector for detecting said video information, which undesirably can be accompanied at times by detected impulse noise; and processing circuitry for providing an output video signal in response to said video information as detected by said video detector, in which output video signal response to said detected impulse noise is suppressed.
The processing circuitry comprises noise detecting means for generating an output control signal responsive to the video information as detected by the video detector, the output control signal being indicative of whether or not an appreciable amount of detected impulse noise accompanies that detected video information; delay means for generating a delayed response to that detected video information; and video output means controlled by the output control signal, for responding to the current value of the delayed response to the detected video information when the output control signal indicates there is not an appreciable amount of detected impulse noise accompanying the detected video information, and for substituting the delayed response to the detected video information for its current value when the output control signal indicates there is an appreciable amount of detected impulse noise accompanying the detected video information.
The present invention is particularly suited to TV receivers of the type which employs two pix IF demodulators, a first synchronous demodulator to detect an in-phase video signal which is designated as the I video signal, and a second synchronous demodulator to detect a quadrature signal designated as the Q video signal.
When standard NTSC television signals are being received by such a TV receiver, the quadrature channel by its very nature has no luminance component and therefore has no low-frequency component
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