摘要
针对立体声道编码要求,分析双声道编码常用方法,比较数字频率合成调制、"硬"和"软"切换方式,确定采用"软"切换方式的双声道编码器设计方案,给出多级脉冲向余弦波逼近的副载波形态;基于左、右声道"和"、"差"信号,推导立体声合成基带信号数学模型,设计十六级软切换双声道编码器.测试结果表明,该编码器较在用的同类产品分离度高5～10dB,能够提高立体声的质量.
According to requirements of the stereo channels coding,this paper analyzes common method of dual-channel coding,and adopts the scheme of dual-channel encoder based on soft handoff by comparison of digital frequency synthetic modulation,hard handoff and soft handoff,and gives subcarrier form which multi-level pulse approach cosine wave,theoretical analysis shows that there is direct relationship between the level of soft handoff and the separation of encoder.Thereby deduces a mathematical model for syntheti...
出处
《大庆石油学院学报》
CAS
北大核心
2010年第5期154-156,174,共4页
Journal of Daqing Petroleum Institute
基金
黑龙江省科技计划项目(GZ07A104)
国家大学生创新实验计划项目(091022019)
关键词
编码器
双声道
高分离度
软切换
encoder
dual-channel
high separation
soft handoff
