Audio signal processing method and audio signal processing apparatus therefor

一种音频信号处理、信号的技术，应用在音频信号处理领域，能够解决阻碍sigma-delta调制器调制操作的能力、不能确保sigma-delta调制器操作稳定性等问题，达到高稳定性、确保操作稳定性的效果

Inactive Publication Date: 2014-06-04
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

[0007] However, high-order sigma-delta modulators accumulate signal values, which makes a large amount of oscillation occur as the order of the sigma-delta modulator increases
Occurrence of oscillations hinders the ability of the sigma-delta modulator to perform modulation operations, so the operational stability of the sigma-delta modulator may not be ensured

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  • Audio signal processing method and audio signal processing apparatus therefor
  • Audio signal processing method and audio signal processing apparatus therefor
  • Audio signal processing method and audio signal processing apparatus therefor

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Embodiment Construction

[0046] The sigma-delta modulator performs shaping on a noise component included in an input audio signal by pushing the noise component to an outer portion of a frequency band according to characteristics of a noise transfer function (NTF).

[0047] The noise shaping of NTF is affected by the order of the sigma-delta modulator. More specifically, the higher the order of the sigma-delta modulator, the closer the noise is pushed to the outer parts of the band during noise shaping. Correspondingly, the higher the order of the sigma-delta modulator, the higher the signal-to-noise ratio (SNR).

[0048] Furthermore, oscillation occurs during sigma-delta modulation if the level of the input signal is greater than a certain threshold according to the feedback characteristics of the sigma-delta modulator. If oscillation occurs, the sigma-delta modulator operates abnormally, so that the stability of the system decreases.

[0049] The improvement of SNR is inversely proportional to the s...

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Abstract

An audio signal processing apparatus and method are provided. The apparatus includes a stability determiner and a sigma-delta modulator. The stability determiner divides a frequency band of an input audio signal into one or more sub-frequency bands, compares a level of the input audio signal for each of the sub-frequency bands with a threshold for the sub-frequency band, and generates a stability determination signal according to a result of the comparison. The sigma-delta modulator sigma-delta modulates the input audio signal according to the stability determination signal, and outputs a modulation signal.

Description

technical field [0001] Apparatuses and methods consistent with the present disclosure relate to audio signal processing, and more particularly, to sigma-delta (sigma-delta) modulation of an input audio signal. Background technique [0002] Class A, B, C and Class D amplifiers are used to receive audio signals and output auditory perception signals. Class D amplifiers reduce the reduction in amplification efficiency that occurs in class A, B, and C amplifiers. Class D amplifiers exhibit higher amplification efficiencies than Class A, B, and C amplifiers. Therefore, Class D amplifiers are widely used. [0003] A class D amplifier is a digital amplifier that modulates an analog input audio signal to generate a digital audio signal and amplifies and outputs the digitally modulated audio signal. [0004] Digital amplifiers have no data conversion loss and theoretically achieve 100% amplification efficiency, so they are widely used. [0005] A digital amplifier modulates an in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G11B20/10
CPCH03F3/2173H03F3/217H03M3/366H03M3/458
Inventor 崔正敏赵宰庸
Owner SAMSUNG ELECTRONICS CO LTD
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