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Method of reproducing audio signals and audio player

An audio signal and signal processing device technology, applied in recording/reproducing/deleting methods, recording signal processing, speech analysis, etc., can solve problems such as sound quality deterioration

Inactive Publication Date: 2003-07-02
SHINANO KENSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the frequency of the reproduced audio signal (c) corresponding to the connection portion (B1, B2, B3, B4) is also different from the original audio signal (a), so the sound quality also deteriorates

Method used

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  • Method of reproducing audio signals and audio player
  • Method of reproducing audio signals and audio player
  • Method of reproducing audio signals and audio player

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Embodiment Construction

[0046] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] First refer to figure 1 The basic idea of ​​the method for reproducing audio signals of the present invention is described.

[0048] Sounds include: vocal sounds, such as vowels, which have the form of periodic waves and are produced by the vibration of the vocal cords; voiceless sounds, such as consonant [s], which are produced by airflow through the narrow space in the mouth without vibrating the vocal cords. If there are voices discontinuous with each other in the connected part of the frame (B1, B2, B3, B4) ( Figure 8 ), an unpleasant sound (noise) will be heard. On the other hand, even if the silent sounds are not continuous with each other, since the frequency of the silent sound is much higher than that of the voiced sound (equal to the vibration frequency of the vocal cords: about 70-350 Hz), few unpleasant sounds are heard. ...

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Abstract

In a method of reproducing audio signals of the present invention, audio reproducing speed can be changed without changing tone and quality of audio signals. Audio signals are filtered to extract basic audio signals. Zero-cross points in the basic audio signals are detected. The original audio signals are divided into a plurality of frames on the basis of the zero-cross points on a time axis. The frames are thinned out, and the original audio signals are reproduced as voice on the basis of the frames left so as to accelerate reproducing speed. On the other hand, the original audio signals are reproduced by repeating the frame so as to make reproducing speed slower.

Description

technical field [0001] The present invention relates to a method of reproducing an audio signal and a sound player, and more particularly to a method of reproducing an audio signal already recorded on a recording medium such as a compact disk (CD) way player. Background technique [0002] In some cases, it is desirable to reduce the reproduction speed of a player (eg, CD player, cassette recorder, video player) to a slower or faster than normal reproduction speed. For example, when a listener wants to listen to recorded audio data for a short time, the reproduction speed needs to be accelerated; if the audio data is recorded quickly, the reproduction speed needs to be slowed down. [0003] Typically, the playback speed of the player is changed by changing the rotation speed of a CD or the running speed of a tape. [0004] With a common method of changing the reproduction speed, the frequency of an audio signal that has been read from a recording medium such as a CD is also...

Claims

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Application Information

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IPC IPC(8): G10L21/04G11B20/02G11B20/10G11B27/00
CPCG11B27/005G10L21/01G10H1/40G11B2220/2545G10H2210/385G11B20/10527G10L25/09G10L21/04G11B2220/20
Inventor 田中伸
Owner SHINANO KENSHI
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