公开(公告)号：US5243124A

公开(公告)日：1993-09-07

申请号：US854080

申请日：1992-03-19

申请人： Clifford Kondratiuk ,  Karim Mitha

发明人： Clifford Kondratiuk ,  Karim Mitha

IPC分类号： G10H1/057 ,  G10H7/04 ,  G10H7/12 ,  H03C1/00

CPC分类号： G10H7/04 ,  G10H1/057 ,  G10H7/12 ,  G10H2210/205 ,  G10H2210/211 ,  G10H2210/331 ,  H03C1/00

摘要： A computer having one or more wave tables stored therein is used to synthesize sounds represented by a series of digital samples produced at a sample rate by specifying parameters including a carrier frequency, a modulating frequency and an index of modulation. At each sample time, a modulation value determined during an immediately preceding sample time is scaled to produce a digital control signal. Also at each sample time the modulation value to be used during an immediately succeeding sample time is read from a location of a wave table determined by the modulating frequency, and a carrier value used to produce the digital samples is read from a location of a wave table determined by the carrier frequency and the digital control signal. Modulation effects are therefore delayed by one sample in order to speed execution of the method using the computer. Phase accumulation is performed using a multiplier making it unnecessary to store the sum of all of the previous steps as would be otherwise be required using an additive approach.

摘要翻译： 使用存储有一个或多个波形表的计算机，通过指定包括载波频率，调制频率和调制指数的参数来合成由采样率产生的一系列数字样本所代表的声音。 在每个采样时间，在紧接在前的采样时间之间确定的调制值被缩放以产生数字控制信号。 同样在每个采样时刻，从由调制频率确定的波形表的位置读取在紧随其后的采样时间中要使用的调制值，并且从波的位置读取用于产生数字采样的载波值 表由载波频率和数字控制信号决定。 因此，调制效应被延迟一个样本，以便加速使用计算机的方法的执行。 使用乘法器执行相位累加，使得不需要使用加法方法存储所有先前步骤的总和。