SBR

[古墙白]

在压缩编码前还进行所谓的频带复制编码（Spectral Band Replication），将高频滤除，只将滤除高频的某些信息编码传送，在解码端再恢复滤出的高频。 Spectral band replication (SBR) is a technology to enhance audio or speech codecs, especially at low bit rates and is based on harmonic redundancy in the frequency domain.