參數(shù)資料
型號(hào)： μSAP70372-B04
廠商： NEC Corp.
英文描述： 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述： 8位單片機(jī)微控制器（8位單片微控制器）
文件頁數(shù)： 15/51頁
文件大小： 132K
代理商： ΜSAP70372-B04
15
CHAPTER 1 GENERAL
This chapter explains the middleware and ADPCM decoder.
1.1 Middleware
Middleware is a software group tuned to draw out the full performance of a processor.
Because many high-performance RISC processors are available today, the processing conventionally imple-
mented by dedicated hardware can now be realized by a high-performance RISC processor and software. The
software used for this purpose is called middleware.
NEC supplies human-machine interface and signal processing technologies in the form of middleware. It provides
excellent system solutions to satisfy the various needs of users.
This ADPCM middleware is a library that compresses and expands speech code (telephone quality).
Remark
RISC: Reduced Instruction Set Computer
1.2 ADPCM
The ADPCM of this middleware codes speech in the analog telephone band (0.3 to 3.4 kHz) stipulated by ITU-
T Recommendation G.726.
Recommendation G.726 was issued in 1990 by adding 40-kbps ADPCM, 24-kbps ADPCM, and 16-kbps ADPCM
to Recommendation G.721 (32-kbps ADPCM) which was adopted as an international standard of telephone quality
coding in 1988.
This middleware supports the 32-kbps ADPCM and 16-kbps ADPCM of Recommendation G.726.
Remark
ADPCM: Adaptive Differential Pulse Code Modulation
ITU-T: International Telecommunication Union-Telecommunication standardization sector
Figure 1-1. Recommendation G.726
Recommendation G.726
Recommendation G.721
32-kbps ADPCM
Note
24-kbps ADPCM
16-kbps ADPCM
Note
40-kbps ADPCM
Note
Supported by this middleware.
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