Near-Instantaneous Companding with Adaptive Quantization
Near instantaneous or block companding has been readily adopted even for broadcast-quality digital audio transmission. The British NICAM-3, e.g., uses block companding for data reduction from 14 to 10 bits per sample. Further reduction of the data stream down to 8 bits per sample for several applications in consumer electronics can degrade the signal quality. In this paper it will be shown how an additional 6 dB of S/N can be gained by a very simple adaptive quantizing scheme. The background for this procedure is deduced from long-term statistical data of typical program material. These statistical data and the results of computer simulation of the proposed Adaptive-Near-Instantaneous-Companding are shown.
Click to purchase paper as a non-member 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 $33 for non-members and is temporarily free for AES members.