Title :
Design, simulation and measurement of split-band digital audio expander and noise-gate
Author :
Sang, Xiaojun ; Chen, Xiaoguang
Author_Institution :
Dept. of Commun. Sci. & Eng., Fudan Univ., Shanghai, China
Abstract :
The split-band digital audio expander and noise-gate plays a key role in the audio system. In this paper, we propose a new method based on crossover and two-dimensional window to realize the device. Traditional methods are implemented by LPF (low-pass filter) and feed-forward detection to control signal. In the proposed method, the gain curve is further controlled and smoothed by windows in two dimensions: time and amplitude, which diminishes the distortion. The method boasts better performance in real environment. Results of MATLAB simulation and measurement of THD+N (Total Harmonic Distortion and Noise) on ADSP21364 are presented finally, verifying the advantage of the two-dimensional window.
Keywords :
audio systems; harmonic distortion; low-pass filters; noise measurement; 2D window; ADSP21364; MATLAB simulation; audio system; feed-forward detection; low-pass filter; noise measurement; noise-gate; split-band digital audio expander; total harmonic distortion measurement; Audio systems; Band pass filters; Design engineering; Distortion measurement; Feedforward systems; Gain control; Loudspeakers; Mathematical model; Noise measurement; Working environment noise; THD+N; digital audio; expander; noise-gate; two-dimensional window;
Conference_Titel :
Information, Communications and Signal Processing, 2009. ICICS 2009. 7th International Conference on
Conference_Location :
Macau
Print_ISBN :
978-1-4244-4656-8
Electronic_ISBN :
978-1-4244-4657-5
DOI :
10.1109/ICICS.2009.5397498
