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1、A single-chip voice input and playback systemApplication of SCM for Embedded System Experimental test of modern electronic technology is an important direction of development. To the system as development platform for voice processing technology can experiment, including voice recording and playback
2、, voice compression coding and decoding, voice recognition and other content designed experiment. There are two general ways to design: one is the Microprocessor Design; the other is by means of specialized voice processing chips. SCM is often not achieve such a common complex process and algorithms
3、, even if we manage to achieve a lot of peripheral devices also increases. Although specialized voice processing chips have more, but the specific function of voice processing chips relatively simple, other than in the application of speech is very difficult。1 IntroductionThrough the full use of pro
4、cessor features its own characteristics and development boards provide a wealth of peripheral circuits, constructed the corresponding test and tested system, integrated electronic technology to improve the analysis of experimental ability and practical ability of positive significance. Articles for
5、voice input and playback system is proposed based on the application of experimental SPCE061A SCM solutions, hardware and software design based on the completed SPR4096 PDIUSBD12 chip external memory and external USB devices and expansion, and USB between SCM and SPR4096 communication, to achieve a
6、system of voice input and playback functions.Sunplus Technology Company introduced a voice playback chip SPCE061A hardware conditions, software algorithms on Sunplus offers a large number of voice function library available, which makes the voice playback is very easy to implement. But SPCE061A-chip
7、 FLASH memory is only 32K, a large number of voice resources in the broadcast the needs of expanding memory. This paper discusses the use of Sunplus Technology, Inc. SPR4096 as external memory expansion, combined with SPCE061A Play voice. When we use SPR4096 Sunplus Education Center through the new
8、ResWriter on SPR4096 reading and writing.SPCE061A is sunplus technology r&d and production of high performance to price ratio of a site, use it can be very convenient and flexible realization of voice recording system,the chip has 8 10-bit precision ADC, which transform the way for the audio channel
9、, and built-in automatic gain circuit. This provides a convenient voice entry hardware conditions. Two 10-accuracy DAC, only need an external power amplifier (SPY0030A) to complete the voice of the play. Does not require specialized voice processing chip, to simplify circuit design and improve work
10、efficiency is very effective. Also Sunplus 16 MCU with easy-efficient instruction set and integrated development environment. In this environment, support the standard C language, can achieve C language and assembly language Sunplus call each other and provide a voice record of the library function,
11、 as long as the understanding of the use of library function, you can easily complete voice recorders, which are software development provides convenient conditions.Features: 16 位 nSP microprocessor; Operating voltage: core operating voltage VDD is 3.0 3.6V (CPU), I / O port voltage VDDH to VDD 5.5V
12、 (I / O); CPU clock : 0.32MHz 49.152MHz; Built-2K words SRAM; Built-in 32K Flash ROM; programmable audio processing; crystal oscillator; system is in standby mode (the clock is stopped), power consumption is less than 2A 3.6V; 2 16-bit programmable timer / counter (automatically preset the initial c
13、ount); 2 10-bit DAC (Digital - analog conversion) output channels; 32-bit general purpose programmable input / output port; 14 interrupt sources can be from the timer A / B, time base, two external clock source input, key wake-up; wake-up functions with the touch; use of audio coding SACM_S240 Sunpl
14、us way (2.4K bits / seconds), which can hold 210 seconds of voice data; oscillator phase-locked loop PLL system clock signal; 32768Hz Real Time Clock; 7-channel 10-bit voltage-mode - digital converter (ADC) and single-channel audio module - digital conversion device; sound module - digital converter
15、 input channels built-in microphone amplifier and automatic gain control (AGC) function; have a serial device interface; Low voltage reset (LVR) and low-voltage monitoring function (LVD) function; within Purchase Online Simulation board (ICE, In-Circuit Emulator) interfaces2 Structure and principle
16、of the hardware systemSystem hardware includes: SPCE061A development board, SPR4096 memory modules, USBD12 module, EZ-Probe download cable, PC machine.System uses the offline mode of voice playback system. Voice recorders set by SPCE061A key to achieve the development board. At the same time, the system can realize the basic functions USB: USB devices through memory chips in the audi
