Television – Monitoring – testing – or measuring – Transmission path testing
Reexamination Certificate
2006-01-03
2006-01-03
Yenke, Brian (Department: 2614)
Television
Monitoring, testing, or measuring
Transmission path testing
C348S569000, C348S570000, C348S725000, C348S180000, C455S226300, C455S067110, C342S359000, C725S072000
Reexamination Certificate
active
06982745
ABSTRACT:
An antenna level display device capable of faithfully reflecting any deterioration of a picture quality in receiving a satellite broadcast. In this display device, orthogonal detection of an input signal is executed in a demodulator, and a CN ratio is calculated from a conversion table in a ROM according to the mean value of deflections of mapped points of the received signal on an IQ plane. The demodulated data is compared, in a comparator, with the demodulated data obtained after error correction by a Viterbi decoder, and a CN ratio is calculated on the basis of the bit error rate from a conversion table stored in another ROM. A decision is made to select one CN ratio, which is to be displayed as an antenna level, out of the two calculated CN ratios, and the selected CN ratio is displayed through adaptive switching. Consequently, despite any deterioration of the receiving environment derived from occurrence of phase noise in a converter or the like, it is still possible to display a proper antenna level reflecting the receiving circumstances.
REFERENCES:
patent: 4214273 (1980-07-01), Brown
patent: 4696057 (1987-09-01), Otani
patent: 4835790 (1989-05-01), Yoshida et al.
patent: 4918532 (1990-04-01), O'Connor
patent: 4935814 (1990-06-01), Omoto et al.
patent: 5376941 (1994-12-01), Fukazawa et al.
patent: 5436675 (1995-07-01), Hayashi et al.
patent: 5603114 (1997-02-01), Tomita
patent: 5940028 (1999-08-01), Iwamura
patent: 5966186 (1999-10-01), Shigihara et al.
patent: 6011511 (2000-01-01), Chuong et al.
patent: 6028894 (2000-02-01), Oishi et al.
patent: 6104341 (2000-08-01), Mita et al.
patent: 6356302 (2002-03-01), Kawakami et al.
patent: 6441847 (2002-08-01), Link et al.
patent: 6580452 (2003-06-01), Gangitano
patent: 6671496 (2003-12-01), Hoshi
patent: 6850736 (2005-02-01), McCune, Jr.
patent: 6882693 (2005-04-01), Ozeki et al.
patent: 6931242 (2005-08-01), Hong
Desir Jean W.
Yenke Brian
LandOfFree
Antenna level display device and method, and receiving... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna level display device and method, and receiving..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna level display device and method, and receiving... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3529554