基于AAC比特流的音频信号Hiss噪声抑制方法

doi:10.3969/j.issn.1000-436x.2013.05.003

Abstract

Abstract:

A hiss noise reduction method used for audio signals based on AAC bit-stream in compressed domain was proposed.The input was AAC bit-stream derived from noisy audio signals,and the output was the enhanced AAC bit-stream used for decoder.First,Hiss noise was estimated by modified median absolute deviation (MMAD).Second,the auditory masking threshold and the masking parameters were calculated by modified discrete Flourier transform (MDFT).Finally,the parametric soft-thresholding method was employed to obtain the enhanced AAC bit-stream which was used to get the enhanced audio signals at AAC decoder.The objective and subjective quality testing results indicate that the proposed algorithm can effectively remove the Hiss noise derived from AAC bit-stream of audio signals and ob-viously outperforms the existing hiss noise reduction methods.

Key words: AAC bit-stream, Hiss noise, compressed domain, modified discrete Fourier transform, noise reduction

Feng DENG,Chang-chun BAO,Feng BAO. Hiss noise reduction method used for audio signals based on AAC bit-stream[J]. Journal on Communications, 2013, 34(5): 20-30.

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References 17

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Bark(z)	频点(k)	频率间隔／Hz
1	1～4	0～100
2	5～9	100～200
3	10～14	200～300
4	15～18	300～400
5	19～23	400～510
6	24～29	510～630
7	30～35	630～770
8	36～42	770～920
9	43～50	920～1 080
10	51～58	1 080～1 270
11	59～68	1 270～1 480
12	69～79	1 480～1 720
13	80～92	1 720～2 000
14	93～107	2 000～2 320
15	108～125	2 320～2 700
16	126～146	2 700～3 150
17	147～171	3 150～3 700
18	172～204	3 700～4 400
19	205～246	4 400～5 300
20	247～297	5 300～6 400
21	298～357	6 400～7 700
22	358～441	7 700～9 500
23	442～557	9 500～12 000
24	558～719	12 000～15 500
25	720～1 024	15 500

算法	6dB	12dB	18dB
SS算法	0.06	0.08	0.07
Softthr算法	0.35	0.32	0.23
Wavelet算法	0.12	0.14	0.09
本文算法	0.42	0.39	0.38

信噪比	偏爱SS算法	偏爱本文算法	无偏爱
6dB	8.9%	69.7%	21.4%
12dB	12.4%	60.4%	27.2%
18dB	16.7%	46.8%	36.5%
平均	12.7%	58.9%	28.4%

信噪比	偏爱Softthr算法	偏爱本文算法	无偏爱
6dB	30.2%	43.1%	26.7%
12dB	31.3%	37.8%	30.9%
18dB	33.9%	34.6%	31.5%
平均	31.8%	38.5%	29.7%

信噪比	偏爱Wavelet算法	偏爱本文算法	无偏爱
6dB	20.3%	51.2%	28.5%
12dB	22.7%	45.4%	31.9%
18dB	26.3%	37.2%	36.5%
平均	23.1%	44.6%	32.3%

Hiss noise reduction method used for audio signals based on AAC bit-stream

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