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1975年美国E系统公司公布了一种VADAC型话音分析和数据变换器,这是一种固体化全数字适应性话音处理装置.VADAC是VoiceAnalyzer Data Converter(话音分析数据变换)的缩写.它将语言变换成数码,开关选择速率为2400比特/秒和4800比特/秒. 这种处理器具有说话人识别能力,根据Fairbank韵律测试,单字清晰度可达90%以上. 音频输入可以来自标准电话手机或专用自动交换台.EIA-RS-232型数码输入,可以直接接到数传设备或同时传送话音和数据的时分多路系统,它用独立的数据时钟使装置同
In 1975, E Systems Inc. announced a VADAC voice analysis and data converter, a solid state all digital adaptive voice processing device. VADAC is an acronym for VoiceAnalyzer Data Converter, which converts language Converted to digital with switch selectable rates of 2400 bits per second and 4800 bits per second This processor features speaker recognition capability with up to 90% more word definition per Fairbank prosody test. Audio input can come from a standard phone handset or Dedicated automatic exchange station. EIA-RS-232 digital input, can be directly connected to the data transmission equipment or simultaneous voice and data transmission time-division multiplexing system, which uses a separate data clock to make the device with the same