Signal processing system for performing real-time pitch shifting

Details Signal processing system for performing real-time pitch shifting Signal processing system for performing real-time pitch shifting

1993-09-13

1997-07-01

Sheikh, Ayaz R.

395 22, 395 233, 395 274, G10L 500

Patent

active

056446772

ABSTRACT:
A signal processing system (50) performs real-time pitch shifting for applications such as karaoke, tapeless answering machines, and the like while minimizing distortion. A digital input signal is sampled and stored at successive locations in a variable-size buffer (62) at an input sample rate. Data from the variable-size buffer (62) is interpolated according to a pitch-shifting ratio. An adaptive pitch estimator (61) continually estimates the fundamental frequency of the digital input signal, and the signal processing system (50) adjusts the buffer size of the variable-size buffer (62) in response thereto. The signal processing system (50) changes the buffer size to store the digital input signal for an integral number of periods of the estimated fundamental frequency.

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Sangil Park; "A Real-Time Method for Sample-Rate Conversion from CD to DAT"; Proc. IEEE Int. Conf. Consumer Electronics, pp. 360-361, Chicago, IL, Jun. 18-20 (1990).
Sangil Park; "Digital Sample-Rate Converters"; Internat'l Congress and Exposition, pp. 1-11, Detroit, Michigan, Feb. 25-Mar. 1 (1991).
Sangil Park; "Real-Time Pitch (Frequency) Shifting Techniques"; Proc. of the 10th Internat'l Conf. on Consumer Electronics, pp. 296-297, Chicago, IL, Jun. 5-7 (1991).

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