Patent ID: 6721701
Filing Date: 2004-04-13
Classification: G10L

Abstract:
An apparatus for sound discrimination comprising:an analog-to-digital converter that converts an audio signal to a digital audio sample; a first encoder coupled to the analog-to-digital converter that encodes the digital audio sample to produce a first encoded audio sample; a first comparator coupled to the first encoder to receive the first encoded audio sample and compare the first encoded audio sample to a first plurality of predetermined audio samples to produce a first error representing a difference between the first encoded audio sample and one of the first plurality of predetermined audio samples; a first discriminator that receives the first encoded audio sample, the one of the first plurality of predetermined audio samples, and the first error and selects one of the first encoded audio sample and the one of the first plurality of predetermined audio samples based on the first error to produce a discriminated audio sample; a first decoder that receives a second encoded audio sample and decodes the second encoded audio sample into a decoded audio sample; a second comparator coupled to the first decoder to receive the decoded audio sample and compare the decoded audio sample to a second plurality of predetermined audio samples to produce a second error representing a difference between the decoded audio sample and one of the second plurality of predetermined audio samples; and a second discriminator that receives the decoded audio sample, the one of the second plurality of audio samples and the second error and selects one of the decoded audio sample and the one of the second plurality of audio samples based on the second error to produce a discriminated audio sample; and wherein the first plurality of predetermined audio samples and the second plurality of audio samples represents predetermined audio signals that are to be discriminated by the first discriminator and the second discriminator, respectively.