Browse Prior Art Database

Dynamic Bit Rate Allocation for Store-And-Forward Systems

IP.com Disclosure Number: IPCOM000043291D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Boies, S: AUTHOR [+3]

Abstract

A number of coding methods have been provided which enable multirate encoding of voice signals. One of these methods has been presented at ICASSP 1983, Boston, Mass., by C.R. Galand and D.J. Esteban under the title "Multirate Sub-Band Coder with Embedded Bit Stream: Application to Digital TASI". The output of the multirate speech encoder has an embedded bit stream. The embedded operation is performed by taking advantage of both sub-band coding and dynamic bit allocation techniques. Successive portions of speech signal, each 20 msec long, are coded/compressed and embedded into a format comprising one section for overhead transmission of characteristic parameters and several sections for sub-band bits, with the whole frame being used for coding at the highest bit rate.

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Dynamic Bit Rate Allocation for Store-And-Forward Systems

A number of coding methods have been provided which enable multirate encoding of voice signals. One of these methods has been presented at ICASSP 1983, Boston, Mass., by C.R. Galand and D.J. Esteban under the title "Multirate Sub-Band Coder with Embedded Bit Stream: Application to Digital TASI". The output of the multirate speech encoder has an embedded bit stream. The embedded operation is performed by taking advantage of both sub-band coding and dynamic bit allocation techniques. Successive portions of speech signal, each 20 msec long, are coded/compressed and embedded into a format comprising one section for overhead transmission of characteristic parameters and several sections for sub-band bits, with the whole frame being used for coding at the highest bit rate. Coding at one out of a number of predetermined rates is then achieved through simple deletion of predetermined portion(s) of the frame. The same coding approach can be used in a store and forward voice system to maximize the number of users for a given storage size. The idea is to dynamically decrease the bit rate of stored data taking into account the respective importance of data. One criteria for the appreciation of data importance may be based on age. In other words, new data would be coded at the highest bit rate before being stored. Then as they become older and older, they are transferred into different storage locations after being rec...