The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1996
Filed:
Jan. 19, 1995
Yutaka Nio, Osaka, JP;
Ryuji Matsuura, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
The object of the present invention is to use signal decoding circuits for a first generation EDTV signal and a second generation EDTV signal in common and to suppress an increase of circuit scale. An EDTV signal decoding apparatus of the present invention is constructed with a cascade connection of a first A/D converter, a first signal processing circuit, a first D/A converter, a second A/D converter, a second signal processing circuit and a second D/A converter. The first group composed of the first A/D converter, the first signal processing circuit and the first D/A converter are driven by a clock signal synchronizing with a color burst signal. The second group composed of the second A/D converter, the second signal processing circuit and the second D/A converter are driven by a clock signal synchronizing with a horizontal sync signal. At the first signal processing circuit, a composite video signal is inputted and when a signal discrimination and control circuit judges that a vertical high frequency band helper signal is not multiplexed in upper/lower non-picture periods with the input signal or a vertical high frequency band helper signal is multiplexed in upper/lower non-picture periods but the input signal is in a picture period, a demodulator input signal selector, a luminance signal output selector and I and Q signal output selectors are controlled to be the upper positions and a chrominance signal separated at a three dimensional adaptive type Y/C separator is demodulated at a color demodulator. A luminance signal separated at the three dimensional adaptive type Y/C separator is outputted from a luminance signal output terminal and color signals I and Q demodulated at the color demodulator are outputted from I and Q signal output terminals, respectively.