Patent ID: 7643996
Filing Date: 2010-01-05
Classification: G10L

Abstract:
1. A method for using a computer processor to interpolatively code a digitized audio waveform input signal having a first bitrate into a coded audio waveform output signal having a second bitrate lower than said first bitrate, said method comprising the steps of: extracting a slowly evolving waveform from the digitized audio waveform input signal; estimating a dispersion phase of an excitation signal; locking onto a most probable pitch period; quantizing a sequence of gain trajectory correlation values; using the computer processor to transform the extracted slowly evolving waveform, the estimated dispersion phase, the most probable pitch period and the quantized sequence of gain trajectory values into an interpolatively coded audio waveform output signal with said lower bitrate; and outputting said coded audio waveform output signal, wherein said method comprises using the computer processor to execute at least one step selected from the group consisting of: