摘要
本文介绍了美国杜比实验室研制的适用于广播的宽带数字音频变换编码器系统。编码器的比特率每信道192～64kbit/s,它能提供不同的比特率、编码延时及音频带宽三者折衷的方案。还重点介绍了新一代音频编码器,这种编码器在比特率压缩过程中应用了人耳在频域和时域的掩蔽效应,使用了新型滤波器簇,能根据信号的时间特性和频率特性,动态调整频率与时间分辨率。还介绍了编码器系统现在和将来的应用。
A family of widerand digital audio fransform coders, Which are developed by Dolby Laboratories, Suitable for use in broadcakt applications is presented. The coders operate at a Variety of bit-rates ranging from 192 to 64 kbit/s per channel, and offer various tradeoffs in bit-rate, coding delay, and audio bandwith. In particular, a next-generation audio coder is introduce in which both frequency-domain and temporal masking effects of human hearing are exploited during bit-rate reduction. The coder employs a new fiterbank which dynamically adjusts frequency and time resolution on a signal-dependent basis. Current and future applications of the coding family are described.
出处
《广播与电视技术》
北大核心
1993年第4期41-46,共6页
Radio & TV Broadcast Engineering
关键词
音频变换
编码器
比特率
语音编码
audio transform coder bit-rate reduction coding delay
