CAJ | 학술논문

提出了基于噪声谱结构特性的谱减法,在不增加语音失真的情况下,抑制传统谱减法的"音乐噪声".首先,依据噪声谱结构特性在频带间自适应平滑周期图,减小谱估计方差的同时,避免噪声非连续谱的能量泄露;其次,依据噪声谱的结构特性,对增益函数进行自适应调整以更有效的抑制有调噪声.测试结果表明,不论对宽带噪声还是对窄带噪声,本文算法在信噪比提高和噪声抑制量等客观评价指标上都明显优于传统谱减法.非正式主观测听进一步验证了本文算法的有效性.
제출료기우조성보결구특성적보감법,재불증가어음실진적정황하,억제전통보감법적"음악조성".수선,의거조성보결구특성재빈대간자괄응평활주기도,감소보고계방차적동시,피면조성비련속보적능량설로;기차,의거조성보적결구특성,대증익함수진행자괄응조정이경유효적억제유조조성.측시결과표명,불론대관대조성환시대착대조성,본문산법재신조비제고화조성억제량등객관평개지표상도명현우우전통보감법.비정식주관측은진일보험증료본문산법적유효성.
This paper proposes a novel spectral subtraction algorithm based on the structure of noise power spectral density, which will be herein referred as NPSD-SS, for reducing musical noise without introducing audible speech dis-tortion. First, we propose an adaptive averaging periodogram based on the structure of the noise spectrum, which will be referred NPSD-AAP, where the better performance of the NPSD-SS is achieved mainly due to that the proposed NPSD-AAP provides a low-variance and adaptive-bandwidth spectral estimator. Second, the maximum noise reduction is adaptively determined by the property of the noise spectrum to further suppress the non-continuous noise components. Objective tests show that the NPSD-SS is better than the CSS in terms of the SNR improvement and the amount of noise reduction. Informal listening tests further confirm the validity of the proposed NPSD-SS.