Title :
Speech synthesis software for a 32-bit microprocessor
Author :
Ishikawa, Yasushi ; Kisuki, Yasuhisa ; Sakamoto, Tadashi ; Hase, Tomohiro
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kanagawa, Japan
fDate :
8/1/1998 12:00:00 AM
Abstract :
The achievements in developing a new speech synthesis algorithm with reduced computation and memory consumption as well as the implementation technology centered on the specialized embedded MCU architecture are described in this paper. To cope with these challenges, a method using 1-pitch waveforms with a common phase is proposed. In addition, data relocation in the memory was used to improve the cache hit rate. The floating-point computation was altered to a 16-bit fixed-point computation to reduce the load on a CPU not equipped with an FPU. The performance of the speech synthesis software was verified and evaluated by making a model system incorporating all the aforementioned features. The necessary memory size proven by the evaluation test was 420 kbytes. The data processing time was also reduced by 25% by relocating the codes and data in the memory. The use of fixed-point computation produced a processing speed forty times as high as the floating-point computation. As a result, the total computation amount of this speech synthesis software was proven to be 1 to 1.5 MIPS
Keywords :
cache storage; digital arithmetic; digital signal processing chips; reduced instruction set computing; speech synthesis; 1 to 1.5 MIPS; 1-pitch waveforms; 16 bit; 16-bit fixed-point computation; 32 bit; 32-bit microprocessor; 420 kbyte; cache hit rate; data processing time; data relocation; implementation technology; memory consumption; necessary memory size; performance; processing speed; specialized embedded MCU architecture; speech synthesis software; Electronic equipment; Embedded computing; Hardware; Microprocessors; Navigation; Personal digital assistants; Speech processing; Speech recognition; Speech synthesis; User interfaces;
Journal_Title :
Consumer Electronics, IEEE Transactions on