Boots – shoes – and leggings
Patent
1990-04-18
1992-08-18
Nguyen, Long T.
Boots, shoes, and leggings
36471501, 36472401, G06F 738, G06F 1531
Patent
active
051405431
ABSTRACT:
A digital signal processing apparatus for digitally performing a limiting or compressing process with respect to an input signal. The apparatus includes a comparator responsive to the input signal inputted through an input terminal of the apparatus for comparing the level of the input signal with a predetermined reference level and a calculation circuit for calculating a function on the basis of the difference between the input signal level and the predetermined reference level when the input signal level is higher than the predetermined reference level. Also included in the apparatus is an adding and subtracting circuit responsive to the output of the calculation circuit and the input signal. The adding and subtracting circuit performs addition or subtraction of the input signal with respect to the output of the calculation circuit representing the calculated function in accordance with whether the input signal is positive or negative. A multiplier multiplies the output of the adding and subtracting circuit by a predetermined gain coefficient and outputs the multiplication result from an output terminal of the apparatus.
REFERENCES:
patent: 4901244 (1990-02-01), Szeto
patent: 4926317 (1990-05-01), Wallach et al.
M. Yoritate et al., "A Professional Digital Audio Limiter for CD Mastering Applications," paper presented at the 84th Convention of the Audio Engineering Society, Mar. 1-4, 1988, pp. 1-16.
G. W. McNally, "Digital Audio: Dyamic Range Control of Digital Audio Signals," BBC Research Department Engineering Division paper, Nov. 1983, pp. 1-13.
E. F. Stikvoort, "Digital Dynamic Range Comprressor for Audio," J. Audio Eng. Soc., vol. 34, No. 1/2, Jan./Feb. 1986, pp. 3-9.
Nguyen Long T.
Victor Company of Japan Ltd.
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