Dynamic magnetic information storage or retrieval – Recording for changing duration – frequency or redundant...
Patent
1985-08-21
1987-12-29
Hecker, Stuart N.
Dynamic magnetic information storage or retrieval
Recording for changing duration, frequency or redundant...
360 101, 360 141, 364724, G11B 509, G11B 2728, H03H 1706, G06F 762
Patent
active
047164727
ABSTRACT:
The apparatus comprises a manually operable device producing pulses which directly or after integration, determine the rate of replay of the digital audio. These pulses are counted by a counter. Each pulse corresponds to 1.5/500 s audio. The counter is reset at the rate F.sub.s /2048 where f.sub.s is the constant output sampling rate and its contents are held in a latch whose contents are inversely proportional to the replay sampling period. Adders add the contents of the counter into overflowing accumulators and clocked at the KHz fixed sampling rate f.sub.s and 128 times this rate respectively. The number of SPR of the first accumulator represents the sample displacement while the MSB of the second accumulator provides the replay clock. The sample displacement (d) represents the displacement between an output sample and an input sample and controls a two stage interpolation by way of a finite impulse response filter and a linear interpolating filter.
REFERENCES:
patent: 3571081 (1971-03-01), Coolidge
patent: 3928755 (1975-12-01), Bellanger et al.
patent: 3982277 (1976-09-01), Naylor
patent: 3988607 (1976-10-01), Eggermont et al.
patent: 3997773 (1976-12-01), Van Essen et al.
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4161001 (1979-07-01), Sakamoto
patent: 4270183 (1981-05-01), Robinson et al.
patent: 4301480 (1981-11-01), Kitamura
patent: 4322757 (1982-03-01), Hatakeyama
patent: 4348699 (1982-09-01), Tsuchiya et al.
patent: 4363048 (1982-12-01), Tanaka et al.
patent: 4413289 (1983-11-01), Weaver et al.
patent: 4449154 (1984-05-01), Ohnishi et al.
patent: 4458272 (1984-07-01), Heitmann
patent: 4549173 (1985-10-01), Nakamura
patent: 4549234 (1985-10-01), Sakamoto
patent: 4564918 (1986-01-01), McNally
A Digital Approach to Interpolation, IEEE Proceedings, vol. 61, No. 6, Jun. 1973, by Schafer and Rabiner.
Francis Lee, Time Compression and Expansion of Speech by the Sampling Method, Journal of Audio Engineering Society, vol. 20, No. 9, Nov. 1972.
Bowler Alyssa H.
Hecker Stuart N.
O'Connell Robert F.
LandOfFree
Variable speed replay of digital audio with constant output samp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable speed replay of digital audio with constant output samp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable speed replay of digital audio with constant output samp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-466084