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Apparatus and method for estimating harmonic wave of sound coder

A technology of harmonics and harmonic frequencies, used in instruments, computing, speech analysis, etc., to solve problems such as unnatural sound

Inactive Publication Date: 2003-11-12
ERICSSON LG ENTERPRISE
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Problems solved by technology

Therefore, the synthesized sound of a harmonic coder in silent speech intervals is less natural than that of a CELP coder representing an excitation signal in the form of white noise

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  • Apparatus and method for estimating harmonic wave of sound coder

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Embodiment Construction

[0023] Reference will now be made to embodiments of the invention, examples of which are shown in the accompanying drawings. A method and apparatus for estimating harmonics in a vocoder according to the present invention will be described below.

[0024] The harmonic encoder includes: a harmonic estimation device and a harmonic synthesizer. The performance and computing power of the system should be considered in designing the harmonic estimating device. Estimation of spectral harmonics affects computational effort and sound quality.

[0025] Also, the harmonic estimating device requires a lot of computation for pitch, amplitude, phase, etc., and can use a digital signal processor (DSP). The pitch is found by integer units in the time domain and fractional units in the frequency domain. The fractional pitch-based harmonic estimation method requires a large amount of computation because it is performed analytically using synthesis that minimizes the error energy of the input...

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Abstract

The present invention relates to methods and devices for estimating harmonics that reduce the calculation amount and can be used very effectively in a low transmission rate voice encoder by adjusting a harmonic interval with centering on a multiple of a basic frequency or extracting a peak so that the error between an original signal spectrum and estimated harmonic spectrum is reduced.

Description

technical field [0001] The invention relates to a device and method for estimating harmonics in a vocoder. Background technique [0002] With the rapid development of communication technology, sound processing has become an important means of communication. Sound processing is roughly divided into: sound coding, sound recognition and sound transformation. Voice coding is one of the notable technologies in the recent multimedia environment. [0003] Due to the development of multimedia and mobile communications, services that were previously only provided to special groups or people are now also provided to the public, and many services have grown geometrically. Therefore, the transmission rates used so far cannot satisfy the user group. If the transmission rate decreases and the number of users increases, the sound quality decreases. In this environment, vocoders were developed. [0004] In voice communication services using mobile communication networks and currently s...

Claims

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Application Information

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IPC IPC(8): G10L19/00G06F17/14
CPCG06F17/142G10L19/02
Inventor 尹诚完崔龙洙尹大熙
Owner ERICSSON LG ENTERPRISE
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