[1]陈田明.自适应加重网络增量调制理论分析及电路实现[J].深圳大学学报理工版,2005,22(2):154-158.
 CHEN Tian-ming.Theoretical analysis and circuit implementation of adaptive weighted delta modulation[J].Journal of Shenzhen University Science and Engineering,2005,22(2):154-158.
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自适应加重网络增量调制理论分析及电路实现()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第22卷
期数:
2005年2期
页码:
154-158
栏目:
光电与信息工程
出版日期:
2005-04-30

文章信息/Info

Title:
Theoretical analysis and circuit implementation of adaptive weighted delta modulation
文章编号:
1000-2618(2005)02-0154-05
作者:
陈田明
深圳大学信息工程学院, 深圳 518060
Author(s):
CHEN Tian-ming
College of Information Engineering Shenzhen University Shenzhen 518060 P.R. China
关键词:
增量调制自适应阶距自适应加重网络音乐信号
Keywords:
delta modulation adaptive steps adaptive weighted network music signal
分类号:
TN 914. 32
文献标志码:
A
摘要:
分析音乐信号数字传输处理—自适应加重网络增量调制的原理和适用性,从理论上推导和完善了自适应加重网络的传递函数表达式,描绘了音乐信号的自适应加重曲线.采用瞬时频率法检测信号的频率,接收端根据音乐信号频率大小自动改变去加重网络的上限频率,从而实现降低噪声和提高信噪比,发送端则要采用预加重网络以补偿接收端去加重网络产生的失真.在工作频率为3 kHz时可提高信噪比约7 dB,给出了整个自适应加重网络的具体框图和部分电路.
Abstract:
Adaptive weighted delta modulation was developed to improve digital transmission and processing of music signals. Its mechanism and applicability were analyzed in detail. The transfer function for the adaptive weighting was derived theoretically and the characteristic curve of adaptive weighting for the music signal was generated as well. The method of detecting instantaneous frequency was used to find signal frequency. The upper bound frequency was adaptively adjusted based on the signal frequency of the music,thus decreasing noise and increasing the signal to noise ratio(SNR) at the receiver. At the transmitter, a pre-weighted network was used to compensate distortion generated by the de-weighted network at the receiver. An improvement of 7 dB is achieved at an operating frequency of 3 kHz. The block diagram for this adaptive weighted system and related circuits are given.
更新日期/Last Update: 2015-10-16