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1. 发明授权

US4177706A Digital real time music synthesizer 失效
标题翻译：数字实时音乐合成器
公开(公告)号：US4177706A
公开(公告)日：1979-12-11
申请号：US922803
申请日：1978-07-07
申请人： Alan J. Greenberger
发明人： Alan J. Greenberger
IPC分类号： G10H7/00 , G10H1/06 , G10H5/10
CPC分类号： G10H7/002 , G10H2230/071
摘要： This disclosure pertains to a digitalized music synthesizer functioning in the real time domain to continuously update, in an asynchronous manner, a continuing approximation of a desired waveform by utilizing its memory of the recent history of the operation of the keyboard of the apparatus. A real time clock and a microcomputer are both driven by a single crystal oscillator, operating at any arbitrary frequency that need not correspond with the frequency of the fundamental or harmonic waves to be produced by the apparatus. A memory of the recent history of keyboard events is maintained. The microcomputer utilizes an algorithm employing square waves as a basis and a differential correcting technique which minimizes the quantity of square wave defining terms that need be computed by only recomputing at each time, corrections to the previous computation. The digitalized output, represented by summing the transient amplitudes comprising the updated approximation to the desired waveform, is fed into a digital to analog converter, an amplifier and a speaker system.
摘要翻译：本公开涉及一种在实时时域中工作的数字化音乐合成器，通过利用其对装置的键盘操作的最近历史的存储，以异步的方式持续更新期望波形的持续近似。实时时钟和微型计算机均由单晶振荡器驱动，以任何不需要与设备产生的基波或谐波频率对应的任意频率工作。记录了最近的键盘事件历史记录。微型计算机利用采用方波作为基础的算法和差分校正技术，其最小化仅在每次重新计算时需要计算的方波量定义项的量，并对之前的计算进行校正。将包括更新的近似值的瞬态幅度与期望波形相加所表示的数字化输出馈送到数模转换器，放大器和扬声器系统。

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