Coded data generation or conversion – Analog to or from digital conversion – Increasing converter resolution
Patent
1989-10-30
1991-12-17
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Increasing converter resolution
341143, H03M 120
Patent
active
050737783
ABSTRACT:
A signal processing apparatus reduces the quantization noise by using so-called noise shaping circuits. The input signal may be audio or video signals. One of the noise shaping circuits is supplied with a signal which is the relative addition of the input signal and a dither while the other noise shaping circuit is supplied with a signal which is the relative subtraction of the input signal and the dither. The signal components of the outputs of the noise shaping circuits are effectively combined to cancel the dither components to produce an output with an improved S/N ratio. A plurality of such signal processing apparatus may be arranged in parallel, in which case different dithers are used in the respective signal processing apparatus and the outputs of the respective signal processing apparatus are combined to further improve the S/N ratio.
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patent: 4542369 (1985-09-01), Kasuga
patent: 4853780 (1989-08-01), Kojima et al.
patent: 4864305 (1989-09-01), Toyama
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patent: 4968987 (1990-11-01), Naka et al.
Yamasaki, Journal of the Acoustical Society of Japan, vol. 39, No. 7, Jul. 1983, pp. 452-462, "Application of Large Amplitude Dither to the Quantization of Wide Range Audio Signals".
Masuda Toshihiko
Ueki Masaaki
Yasuda Nobuyuki
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
Williams Howard L.
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