Universal sampling rate converter for digital audio frequencies

Details Universal sampling rate converter for digital audio frequencies Universal sampling rate converter for digital audio frequencies

2007-02-13

2007-02-13

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

Reexamination Certificate

active

10312205

ABSTRACT:
A method for conversion of input audio frequency data, at an input sample frequency, to output audio frequency data, at an output sample frequency. The input data is subjected to expansion to produce expanded data at an output sample frequency. The expanded data is interpolated to produce output data. In one embodiment of the invention the interpolation is effected by a process that also filters the output data. In another embodiment, the input data is sampled by an integer factor to produce expanded data, the expanded data is then interpolated to produce the output data. Also disclosed is a method of transition of a signal output, at one frequency, to a signal output at another frequency. The signal output at said one frequency is faded out over a period, and the signal output at said other frequency is faded in over that period. Both signal outputs are combined to produce the signal output over said period. Apparatus for effecting the methods is also disclosed.

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Pyfer, M. et al., “The Design and Application of Optimal FIR Fractional-Slope Phase Filters,”in Proceedings of the ICASSP 87, Dallas, Apr. 6-9, 1987, pp. 896-899, XP-002160241.

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