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US 2005/0240296 A1Published application
Audio signal reproducing apparatus
AssigneeSony Corporation
InventorsMasayuki Nishiguchi, Yoshihito Fujiwara
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Abstract
A small-sized audio signal reproducing apparatus for hearing reproduced audio signals with the aid of a headphone is disclosed. Digitized and compression encoded audio signals, stored in a semiconductor memory, are read out so as to undergo a decoding operation, which is an inverse operation to compression encoding, to reproduce the audio signals, and the reproduced signals are heard by the headphone. The apparatus may be significantly reduced in size and weight as compared to the apparatus in which a tape or a disk is used as the recording medium.
Claims5
-3. (canceled)
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.
3 more elements
Dependencies are inferred from the claim text.