A hierarchical lossless/lossy coding system for high quality audio up to 192 kHz sampling 24 bit format

Abstract

We present a flexible audio coding system for use in the unbroken transmission of high-quality (192 kHz sampling rate, 24-bit digitization (max.)) stereo-audio data streams, either live or recorded. The system provides both lossless and variable-level lossy quality; quality is selectable to suit a full range of wide- and narrow-band IP networks. As input signals for transmission at the server PC, less than nine PCM sound files in different formals are simultaneously encodable, and the efficiency of simultaneous compression is very high. The system is realized by software that runs on a typical PC. This makes everyone able to transmit high-quality sound anywhere within the IP networks. An MPEG-4 audio codec (TwinVQ or AAC) provides the core of the lossy-coding module.