Title :
NTSC compatible wide-screen TV system with PCM sound using QAM
Author :
Kageyama, S. ; Goto, M. ; Takeno, H. ; Ishikawa, K. ; Arita, H. ; Inoue, S. ; Uwabata, H. ; Yasumoto, Y.
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
8/1/1990 12:00:00 AM
Abstract :
A CATV (cable television) transmission experiment proved the complete compatibility of a wide-screen QAM (quadrature amplitude modulation) based TV system with CATV. Even under the worst CATV conditions (50 dB CTB, 38 dB C/N, slight annoying reflections), no specific impairment or degradation was perceived in the wide-screen TV or the NTSC. As a result of a subjective estimation of interference to conventional NTSC TV sets, it is shown that there is no need for a guard band between NTSC- and QAM-based TV channels. The system is capable of transmitting PCM (pulse-code-modulated) stereo sound. 320-kHz, 16 bit/sample data are efficiently band-compressed into about 250 kb/s using subband coding, and transmitted during some parts of the vertical blanking and vertical overscanning periods through the QAM channel
Keywords :
Hi-Fi equipment; amplitude modulation; cable television; pulse-code modulation; television broadcasting; 16 bit; 250 kbit/s; 32 kHz; CATV; NTSC TV sets; PCM stereo sound; TV channels; cable television; interference; pulse-code-modulated; quadrature amplitude modulation; transmission experiment; widescreen QAM TV system; Bidirectional control; Blanking; Cable TV; Crosstalk; Degradation; Distributed amplifiers; Image converters; Phase change materials; Quadrature amplitude modulation; TV interference;
Journal_Title :
Consumer Electronics, IEEE Transactions on
