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This paper presents a perceptual wavelet packet audio coder incorporating temporal and simultaneous masking models with a scalable bit rate allocation scheme. It is demonstrated that the use of even a relatively simple functional model of temporal masking produces bit rate savings in addition to those given by simultaneous masking. The performance of the coder is evaluated using the PEAQ (ITU-R BS...
A novel speech enhancement technique is presented based on the temporal masking properties of the human auditory system. The input signal is divided into a number of sub-bands that are individually and adaptively weighted in the time domain according to a short term SNR estimate in each sub-band. The short time SNR estimate is calculated using the temporal masking thresholds in each sub-band. Objective...
In speech processing an estimation of the speech pitch period is important. Real time pitch detection is only possible by the selection of an efficient algorithm suitable for implementation on a programmable processor or in special-purpose hardware. The use of the periodogram algorithm (p.a.) is proposed to detect the pitch period of voiced speech. This algorithm is attractive for the following reasons:...
Multiplication of a 2's-complement number by a known coefficient is often required in digital signal processing and other applications. When this is required to be performed on a microprocessor, an extension of Booth's algorithm (e.b.a.) can be used. Examples are presented to demonstrate how the multiplication is performed using e.b.a. on a microprocessor, and comparisons are made with the machine...
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