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Audio playback apparatus

An audio and decoder technology, applied in the field of audio playback devices, can solve the problem of not realizing the expected part of loop playback

Inactive Publication Date: 2007-05-09
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique enables playback of a short sentence of audio data without pause; however, it does not enable looped playback of a desired portion extracted from a short sentence of the audio waveform

Method used

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  • Audio playback apparatus
  • Audio playback apparatus
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no. 1 example

[0031] FIG. 1 shows a structural block diagram of an audio playback device according to a first embodiment of the present invention. In FIG. 1, a memory 10 stores many audio data files formed of compression-encoded data generated by performing compression-encoding on sample strings of audio waveforms according to a specified compression-encoding algorithm such as MP3. The decoders 21 and 22 respectively perform decoding on the compression-coded data read from the memory 10, thereby reproducing a sample string of an audio waveform. The audio output device 30 is made up of the following: a digital-to-analog converter (D / A converter), which is used to convert the sample string output by the decoder 21 or the decoder 22 into an analog signal; An amplifier for analog signals; and a speaker for producing sound based on the output signal of the amplifier.

[0032] The controller 40 is composed of a ROM for storing many programs, a CPU for executing the programs stored in the ROM, an...

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Abstract

An audio playback apparatus realizes both of normal playback and loop playback with respect to compressive coded data forming an audio waveform of one phrase, which is constituted by a string of samples and which includes a loop section. In the normal playback, a decoder sequentially reproduces the samples. In the loop playback, the decoder sequentially reproduces the samples until a sample preceding a loop start point, then, the decoder repeatedly reproduces the samples belonging to the loop section, then, the decoder sequentially reproduces the samples started from the loop start point. Alternatively, two decoders are alternately controlled to perform decoding in the loop playback. Thus, it is possible to reliably output all the samples including the samples of the loop section without causing breaks.

Description

technical field [0001] The present invention relates to an audio playback device for decoding and reproducing compression-coded audio data. [0002] This application claims priority from Japanese Patent Application No. 2005-320535 and Japanese Patent Application No. 2006-45153, the contents of which are incorporated herein by reference. Background technique [0003] Recently, various encoding and decoding technologies, such as MP3 (MPEG Audio Layer-3) and AAC (Advanced Audio Coding), have been developed and widely used in audio playback devices. [0004] Compared with CD players and broadcasting systems, game devices are designed with a different concept because of the loop playback function (or loop reproduction function) in which a specified part of a music tune or a short sentence of voice is repeatedly played back and reproduced. A game device usually plays back compression-encoded audio data (hereinafter simply referred to as compression-encoded data) through a loop pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G10L19/00
Inventor 铃木俊彦
Owner YAMAHA CORP