Pitch control of memory addressing for changing speed of audio p

Details Pitch control of memory addressing for changing speed of audio p Pitch control of memory addressing for changing speed of audio p

1995-07-25

1998-02-10

MacDonald, Allen R.

395 226, 395 276, G10L 302, G10L 908

Patent

active

057178291

ABSTRACT:
The playback speed of an audio signal is decreased or increased by repeatedly reproducing a preset audio signal domain or removing a domain of the audio signal. A memory stores the audio signal and an audio pitch is calculated from the audio signal readout from the memory. The audio pitch and information relating to power of the audio signal are used to produce a memory address sample set to be used in addressing the memory to reading out the audio signal at a desired playback speed. An address phase signal is fed back from a memory address controller to prevent over running or gaps from being formed in the audio signal reading out.

REFERENCES:
patent: 4464784 (1984-08-01), Agnello
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patent: 4959865 (1990-09-01), Stettiner et al.
patent: 5233660 (1993-08-01), Chen
Edward P. Neuburg, "Simple pitch-dependent algorithm for high-quality speech rate changing," J. Acoust. Soc. Amer. 63(2), pp. 624-625, Feb. 1978 .

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