Method and system for memory usage in real-time audio systems

Abstract

System and method for encoding, transmitting and decoding audio data. Audio bit steam syntax is re-organized to allow system optimizations that work well with memory latency and memory burst operations. Multiple small entropy coding tables are stored in RAM and loaded to on-chip memory as needed. Audio prediction is pipelined in the bitstream syntax. Intra frames, independent of other frames in the bitstream, are included in the bitstream for error recovery and channel change. New algorithms are implemented in legacy syntax by including the new information in the user data space of the audio frame. The new decoder can use projection to determine where the new information is and read ahead in the stream. Audio prediction from the immediately previous frame is restricted. Audio prediction is performed across channels within a single audio frame. A variable re-order function comprises storing channels of data to DRAM in the order they are decoded and reading them out in presentation order.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS / INCORPORATION BY REFERENCE [0001] This patent application claims priority to U.S. Provisional Patent Application 60 / 546,796, filed Feb. 23, 2004, the subject matter of which is hereby expressly incorporated herein by reference.FIELD OF THE INVENTION [0002] Certain embodiments of the invention relate to audio processing. More specifically, certain embodiments of the invention relate to a method and system for memory usage in real-time audio systems. BACKGROUND OF THE INVENTION [0003] Some of today's audio systems are developed for embedded processing in devices such as set-top boxes, digital versatile disk (DVD) players, camcorders, portable audio players, and so on. All of these systems rely on low-cost hardware decoders or low-cost digital signal processors (DSP). A major factor that affects the cost of any audio processing system is memory demands such as memory bandwidth. In simple audio-only applications, for example, there may be minimal ...

AI Technical Summary

Benefits of technology

[0031]FIG. 7 is a diagram illustrating exemplary prediction of small segments of data, which may be utilized in con

Problems solved by technology

A major factor that affects the cost of any audio processing system is memory demands such as memory bandwidth.

Optimizing the usage of memory space and memory bandwidth often results in large system cost savings.

RAS and CAS signals overhead, page break delays, and / or physical timing constraints of dual data rate RAM (DDR) systems may cause increased delay in the response time of DRAM devices.

Although there is a simultaneous increase in the speeds of DRAMs, which results in larger amounts of DRAM data, the resulting DRAM data is very bursty in nature.

This also increases the burst size demanded by clients such as audio processing clients.

However, this does not work well with certain types of audio syntax, audio systems, and / or audio decoder operations.

Accordingly, this does not provide an optimal manner for processing.

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