Boots – shoes – and leggings
Patent
1979-11-28
1981-05-26
Atkinson, Charles E.
Boots, shoes, and leggings
364900, 364723, 370118, G10L 100
Patent
active
042700264
ABSTRACT:
This speech signal digital interpolator increases data (and date rate) by first using an interface unit for rate-changing and zero-stuffing a 32 Kiloword/sec (13 bits/word) signal to form a 1.024 Megaword/sec (13 bits/word) signal, which is then smoothed by a low-pass filter and approximated with 3-bit words. The interface circuit repeats each word a given number of times at the increased rate with each word separated by an all zero bit word having the same number of bits as the digital word to provide an output signal of a specified pattern for each word in the digital signal. A low pass recursive filter responds to the output signal from the interface means and is operative to provide a filtered output digital signal having smooth transitions between each output digital word with said filter output signal at said increased rate and with each output filtered digital word being of a lesser number of bits than the bits in said original signal. Due to the selection of the filter configuration, the coefficients of the filter are restricted to be of the form 2.sup.-K to thereby implement the recursive filter without the use of digital multipliers.
REFERENCES:
patent: 3973081 (1976-08-01), Hutchins
patent: 3988607 (1976-10-01), Eggermont et al.
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4021616 (1977-03-01), Betts
P. Van Gerwen et al., "A New Type of Digital Filter," IEEE Trans. on Comm., Feb. 1975, pp. 222-234.
M. Tubiana, "Digital Filter Having Integral Coefficients," IBM Tech. Discl. Bull., Mar. 1976, pp. 3322-3324.
Agrawal Bhagwati P.
Shenoi Kishan
Atkinson Charles E.
International Telephone and Telegraph Corporation
Kemeny E. S.
Morris Jeffrey P.
O'Halloran John T.
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