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Audio Signal Processing

Digital-signal-processor-for-adding-harmonic-content-to-digital-audio-signal

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Digital signal processor for adding harmonic content to digital audio signal

Details

Inventors: Massie, Dana C.;
Assignee: Creative Technology, LTD (SG)
Primary Examiner: Chan; Wing F.
Assistant Examiner: Lee; Ping W.
Attorney, Agent or Firm: Townsend and Townsend and Crew LLP

A digital audio signal processor for adding harmonic content to an input audio signal through a non-linear transfer function with discontinuities. The discontinuities are generated by bit shifting each input value by an amount dependent on the sign and magnitude of the input value. The amount by which the input value is shifted is roughly inversely related to the magnitude of the logarithm of the input value. The transfer function is fractal and so provides increased harmonic content for all signal amplitudes.

DETAILED DESCRIPTION It is an object of the present invention is to provide added harmonic content to an audio signal in a computationally efficient way.
The present invention introduces distortion to an input audio signal consisting of a sequence of input sample values.
For each sample value a priority encoder determines the bit number of the most significant bit which differs from the sign bit.
The bit number is fed to a barrel shifter which left-shifts the input sample value to produce an output sample value, so that the sign bit of the output sample value differs in polarity from the next most-significant bit.
Other objects, features and advantages of the present invention will become apparent from the following detailed description when taken in conjunction with the accompanying drawings.

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