Project Title: Low Bit-rate Vocoders

The Challenge

One of the main challenges was the complexity of the project. SPIRIT has significantly improved and modified standard voice compression technologies to achieve the necessary speech quality at such low bit rates. The project required extensive competency in several different fields such as speech theory, speech compression, digital signal processing theory, C++ and DSP-assembler programming. SPIRIT has all the experts who meet the highest standards in all the required areas and have PhD and master degrees in mathematics, engineering and computer science.

All the supplementary algorithms for speech enhancement, telephony signaling and echo cancellation were developed from scratch. The other challenge SPIRIT encountered was very strict technical specifications for hardware MIPS and memory requirements. But due to SPIRIT over 10-year experience in sophisticated DSP software development all the requirements were met on time. High quality of the developed voice codecs was achieved via filed-testing in the environment that had been specially developed for these purposes.

The Solution

Low bit rate voice codecs developed by SPIRIT are intended for sampled speech compression at rates 1200, 2400 and 4800 bps. The software was developed and optimized for usage on Texas Instruments' C54x platform and included several other speech processing algorithms for speech enhancement, noise reduction, telephony signaling and echo cancellation.

The low bit-rate vocoders project was successful for a number of reasons, both business and technical in nature.

• On-time project completion
  
• On-budget project completion
  
• Periodical review by the customer convinced the customer that SPIRIT is developing exactly what customer specified
  
• The successful knowledge transfer after the project completion
  
• High competency in the application domain, allowing SPIRIT to develop the product with the following technical benefits:
  • Improved speech algorithms
    
  • Advanced technical specifications
    
  • Easy integration with the target hardware platform and other software

The low bit-rate vocoders project was successfully completed in September 2001. The project was fulfilled within the budget and within the required time frame. Ever since, the product hasn't required any significant maintenance due to the high quality and extensive internal testing. Off-site project development in Moscow Russia proved to be notably cheaper than the on-site development, which would have done at the customer site.

Tools and Technologies

• MS Visual Studio
  
• Code Composer Studio, JTAG emulators, C54x, C55x evaluation boards
  
• Matlab
  
• Proprietary simulation tools

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