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现代社会已进入信息时代。信息技术日新月异。微处理器和存储器集成芯片正在应用于电话机中,使之向多功能、智能化方向发展。 下面以HL—946电话机为例,介绍智能电话机的组成及工作原理。 HL—946数字录音电话的构成如图1所示。它由微处理器(DSP)、存储软件的可编程只读存储器(EPROM)、存储语音的动态随机存储器(DRAM)、编码/解码器及外围电路组成。模—数转换器(ADC)对语音信号进行每秒8000次采样。获得的数字信号经过微处理器加工处理后,被压缩在DRAM中;放音时,微处理器把DRAM中的信息调出进行解码、合成,最后通过数—模转换(DAC)获得语音。微处理器采用的是美国最先进的ADSP集成芯片,它调用和执行EPROM中的软件,从而完成所有的计算和处理工作。它能接受外部命令(按键)而
Modern society has entered the information age. Information technology is changing rapidly. Microprocessors and memory integrated chips are being used in telephones to make them multifunctional and intelligent. The following to HL-946 phone, for example, describes the composition of smart phones and working principle. The composition of HL-946 digital recording telephone is shown in Fig.1. It consists of a microprocessor (DSP), programmable read-only memory (EPROM) for storing software, dynamic random access memory (DRAM) for storing speech, an encoder / decoder, and peripheral circuitry. The analog-to-digital converter (ADC) samples the speech signal 8000 times per second. The obtained digital signal is processed by the microprocessor and then compressed in the DRAM. During the playback, the microprocessor demodulates the information in the DRAM to decode and synthesize, and finally obtains the speech through digital-analog conversion (DAC). Microprocessor using the most advanced ADSP integrated chip in the United States, it calls and executes the software in EPROM, thus finish all calculation and processing work. It can accept external commands (keys) instead