Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Reexamination Certificate
1998-10-28
2001-06-12
Eisenzopf, Reinhard J. (Department: 2614)
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
C358S901100, C375S231000, C375S232000, C375S229000, C375S315000, C370S290000, C370S291000
Reexamination Certificate
active
06246444
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital and analog TV common-use receiver which can receive both terrestrial digital and analog TV signals, and more particularly, to a digital and analog TV common-use receiver having a single ghost canceler which can correspond to both digital and analog broadcasts, and a ghost cancellation method.
2. Description of the Related Art
Recently, a terrestrial digital TV signal receiver (hereinafter, called “digital TV receiver”) has been developed and will be put into use in the near future. Even when the digital TV receiver is put into use, both terrestrial digital and analog broadcasts will coexist until a predetermined time to protect the existing terrestrial analog TV signal receiver (hereinafter, called “analog TV receiver”). Accordingly, the digital TV receiver must be capable of receiving not only the digital TV signal but also the existing analog TV signal.
Meanwhile, a high-tech waveform equalizer (also called “a ghost canceler”) having a hardware of large capacity is used to compensate for a ghost (also called “multipath distortion”) generated by a reflected wave of a multipath, which is the most serious cause of image quality degradation, upon receiving a terrestrial signal. Thus, at present, utilization of the waveform equalizer in the terrestrial analog TV receiver is incomplete, but the digital TV receiver necessarily requires the waveform equalizer.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a digital and analog TV common-use receiver having a single ghost canceler since an equalizer used when receiving a terrestrial digital TV signal is commonly used upon receiving a terrestrial analog TV signal.
It is another objective of the present invention to provide a ghost cancellation method for a digital and analog TV common-use receiver, which cancels a ghost corresponding to both terrestrial digital and analog TV signals.
Accordingly, to achieve the first objective, there is provided a digital/analog TV common-use receiver having a single ghost canceler, which can receive both analog and digital TV signals, the single ghost canceler comprising: a first filter coefficient generator for generating first filter coefficients using a first reference signal included in the analog TV signal; a second filter coefficient generator for generating second filter coefficients using a second reference signal included in the digital TV signal; and a digital filter for filtering the analog TV signal using the first filter coefficients if the analog TV signal is received, and the digital TV signal using the second filter coefficients if the digital TV signal is received, according to an analog/digital TV selection signal.
To achieve the second objective, there is provided a ghost cancellation method for a digital/analog TV common-use receiver for receiving both analog and digital TV signals, comprising the steps of: (a) generating first filter coefficients using a first reference signal included in the analog TV signal and a predetermined first reference signal; (b) generating second filter coefficients using a second reference signal included in the digital TV signal and a predetermined second reference signal; and (c) filtering the analog TV signal using the first filter coefficients if the analog TV signal is received, and the digital TV signal using the second filter coefficients if the digital TV signal is received, according to an analog/digital TV selection signal.
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Eisenzopf Reinhard J.
Natnael Paulos
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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