Boots – shoes – and leggings
Patent
1987-09-28
1989-09-12
Mottola, Steven
Boots, shoes, and leggings
364748, G06F 748
Patent
active
048666483
ABSTRACT:
A digital filter of an FIR (non-recursive) type operating as an oversampling filter in digital signal processing such as for a stereophonic audio device comprises a memory storing impulse response coefficient data, a mantissa data producing circuit for converting the coefficient data to mantissa data, a multiplier for multiplying input data with the mantissa data, an accumulator for accumulating output data of the multiplier, and a bit-shifting circuit for bit-shifting accumulated output data of the accumulator by the number of bits substantially corresponding to the change in the number of bits of exponent data in the coefficient data. The mantissa data is combined with input data in the convolution operation and the exponent data is imparted, in accumulation of multiplied values, by the bit-shifting of the accumulation output data. In one aspect of the invention, the bit-shifting is performed in a decreasing direction starting from the coefficient of the smallest exponent.
REFERENCES:
patent: 4511990 (1985-04-01), Hagiwara et al.
Finn, William J., "LSI Hardware Implements Signal Processing Algorithms", Computer Design, vol. 19, No. 3, Mar. 1980, pp. 137-142.
Mottola Steven
Yamaha Corporation
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