Method of amplitude coding for low bit rate sinusoidal transform

Details Method of amplitude coding for low bit rate sinusoidal transform Method of amplitude coding for low bit rate sinusoidal transform

1998-06-10

2000-04-18

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704208, 704212, 704230, G10L 1902

Patent

active

060526580

ABSTRACT:
The present invention provides a sinusoidal transform vocoder based on the Bark spectrum, which has high quality and low bit rate for coding. The present invention includes the steps of transforming a harmonic sine wave from a frequency spectrum to a perception-based Bark spectrum. An equal-loudness pre-emphasis and the loudness to a subjective loudness transformation are also involved in the method. Last, a pulse code modulation (PCM) is used to quantize the subjective loudness to obtain quantized subjective loudness. In synthesis, the Bark spectrum is inversely processed to obtain the excitation pattern following the sone-to-phone conversion and equal-loudness deemphasis. Then, the sine wave amplitudes can be estimated from the excitation pattern by assuming that the amplitudes belonging to the same critical band are equal.

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Wang et al., "An Objective Measure for Predicting Subjective Quality of Speech Coders", IEEE Journal on Selected Areas in Communications, vol. 10, No. 5, pp. 819 to 829, Jun. 1992.
"DPCM Coding of Spectral Amplitudes Without Positive Slope Overload", Michael J. Sabin, IEEE Transactions on Signal Processing, vol. 39, No. 3, Mar. 1991, pp. 756-758.
"Sine-Wave Amplitude Coding at Low Data Rates", McAulay et al., pp. 203-213.
"Low-Rate Speech Coding Based on the Sinusoidal Model", McAulay et al., pp. 165-208.

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