Custom DSP design MPEG-4 wireless video products

The video standard MPEG-4 has very high requirements on the processor. In the entire mobile communication structure, the MPEG-4 processor alone will swallow a large amount of resources with impunity. Therefore, in order to truly realize the dream of wireless video applications, we must first solve the MPEG-4 signal processing problem.

Engineers have tried to use fixed coding logic and general-purpose DSP to complete this giant MPEG-4 processing, but the results are not satisfactory. Although fixed coding logic can provide higher performance, the time required for design and implementation is too long, and the design results obtained are not flexible enough to meet the needs of future modification. Although the general programmable digital signal processor (DSP) is very suitable for limited impulse response (FIR) filtering and other MAC-intensive applications, it is unable to solve the algorithms inherent in video coding and decoding such as variable length decoding and discrete cosine transform Effectively realized.

So how can we design a processor that meets the requirements? This article gives a solution: using a custom DSP. Engineers can use the digital DSP IP core and combine some new design methods to design a customized engine to complete the required MPEG-4 functions, thereby turning wireless video applications into reality.

The first step of this solution is to develop an application software to implement the MPEG-4 video standard, and then optimize and verify the software to ensure that it meets the requirements of the MPEG-4 video standard. The second step, after the application software is optimized, compile it to a general-purpose DSP engine, and carefully analyze its performance bottlenecks in the application. Through analysis, construct a group of computing units (DDCU) defined by the designer to solve the calculation bottleneck problem in the application in a targeted manner. This group of DDCUs constitutes a library. With this library, designers can create different user application DSP engines for different products and product domains. For example, in a PDA that supports QCIF (Quarter Ordinary Interface Format) and CIF frame format, a simple custom DSP can be created through Simple Level (SP) and Advanced Simple Level (ASP) to implement low-speed codec.

In addition, through proper design planning, designers can also make the performance of the engine just meet the requirements of the target product-for example, designing a DSP engine with a frame processing speed of 15 frames per second for the CIF format-this can reduce the clock rate , Instruction length and storage image requirements to achieve low power and low cost. But if you want to support larger frames and support advanced analysis, you need to create a higher-performance DSP engine. The internal parallelism of this kind of DSP engine is higher, the amount of available resources is larger, so the running speed is also faster.

In the final step, the custom DSP is integrated into the multi-processor core, and the purpose of further planning high-end application performance is achieved through the combined effect of the two. In today's communications industry, products are being brought to market faster and faster. The methods and tools mentioned above just provide a better solution for quickly analyzing and creating custom DSPs to accelerate product design.

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