MPEG-4 Low Delay Audio Coding Based on the AAC Codec
Perceptual audio coding is known to deliver high sound quality even at low bit rates for a broad range of audio signals. However, the total delay of the encoder/decoder chain is usually considerably higher than acceptable for two-way communication applications, such as teleconferencing. This paper discusses the primary sources of algorithmic delay in a perceptual audio codec and describes an MPEG-2 AAC-derived codec which was optimized for very low delay and accepted as the baseline of development for low-delay coding in MPEG-4 version 2 audio.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.