Digital broadcast receiver that switches between NICAM audio and

Details Digital broadcast receiver that switches between NICAM audio and Digital broadcast receiver that switches between NICAM audio and

1995-02-16

1996-07-02

Kostak, Victor R.

Television

Receiver circuitry

Sound circuit

348731, 455 63, 381 3, H04N 560

Patent

active

055327621

ABSTRACT:
A digital audio broadcast receiving apparatus that minimizes a frequency at which the user switches between NICAM audio and analog audio. When a reserve audio switching flag C4 is "H" it indicates that analog audio and NICAM audio represent the same program, in which NICAM audio, which provides better sound quality, is automatically selected. If a broadcast receiving condition deteriorates, analog audio is automatically selected. Conversely, when the flag C4 is "L", it indicates that NICAM audio and analog audio represent two different programs. In this case, analog audio that is in synchronization with video is automatically selected. At this moment, it is possible that the user intentionally selects NICAM audio, which is not related to video, so that NICAM audio is not switched to analog audio even if NICAM audio has some noise. An audio switching point is shifted by changing a threshold for determining PCM data error rate or by changing a sampling time.

REFERENCES:
patent: 5038402 (1991-08-01), Robbins
patent: 5072297 (1991-12-01), Kanazawa et al.
patent: 5202766 (1993-04-01), Mehrgardt et al.
patent: 5220602 (1993-06-01), Robbins et al.
patent: 5450081 (1995-09-01), Kuhn et al.
Patent Abstracts of Japan, vol. 14, No. 433, Jun. 27, 1990 (S. Kazuhiko et al.).
BBC Research Department Report, "NICAM 728--Digital Two-Channel Sound for Terrestrial Television," No. 6, 1990, pp. 1-27 (A. J. Bower).
Elektor Electronics, "The NICAM System," No. 200, May 1992, pp. 29-33 (J. Buiting).
IEEE Trans. on Consumer Electronics, "NICAM Decoder for Digital Multi-Channel TV Sound Broadcast," vol. 37, No. 3, Aug. 1991, pp. 684-691, (G. Shipton et al.).
Electronic Components & Applications, "NICAM--728 Two-Channel Digital TV Sound," vol. 10, No. 3, 1990, pp. 121-127 (P. Double).

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