Patent ID: 7337027
Filing Date: 2008-02-26
Classification: G10L,G11C,H04R

Abstract:
1. A portable audio player comprising: a memory unit configured to store digitized and high-efficiency compression encoded audio data; a decoder configured to read out data stored in said memory unit and to decode the read-out data by performing an inversion of a compression encoding used to obtain the high-efficiency encoded audio data; a digital/analog converter configured to covert output signals from said decoder into analog signals to be transmitted to a headphone; and a portable housing containing said memory unit, said decoder, and said digital/analog converter, wherein the audio data is compression encoded by transforming audio data into a plurality of frequency components associated with a plurality of frequency bands, and quantizing at least one of frequency component of the plurality of frequency components according to a masking spectrum associated with the frequency component and a minimum audible curve based on human auditory sense.