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公开(公告)号：US4868773A
公开(公告)日：1989-09-19
申请号：US111112
申请日：1987-10-22
IPC分类号： H03H17/02
CPC分类号： H03H17/0263
摘要： A method and apparatus of digitally filtering an M-level signal decomposes the M-level signal into M-1 binary threshold signals by thresholding it at each value from 1 to M-1. The kth threshold signal has the value 1 at a given position if and only if the input signal is at least k at that position; otherwise it has the value 0. Filtering each of the MSTATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY-SPONSORED RESEARCH AND DEVELOPMENTThis invention was made with government support under Research Grant ECS-8306235 from the National Science Foundation. The government may have rights in this invention.
摘要翻译： 对M级信号进行数字滤波的方法和装置，通过在从1到M-1的每个值进行阈值处理将M级信号分解成M-1个二进制阈值信号。 当且仅当该位置的输入信号至少为k时，第k个阈值信号在给定位置具有值1; 否则它具有值0.用所需的二进制运算符过滤每个M-1阈值信号。 最后，来自所有滤波器的二进制输出被按位相加以产生经数字滤波的输出信号。
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2.发明授权Digital tone generation system with slot weighting of fixed width window functions 失效具有固定宽度窗口功能的插槽加权的数字音调生成系统
公开(公告)号：US4440058A
公开(公告)日：1984-04-03
申请号：US500552
申请日：1983-06-02
申请人： Steven C. Bass , Thomas W. Goeddel
发明人： Steven C. Bass , Thomas W. Goeddel
CPC分类号： G10H7/08 , G10H2250/265
摘要： An electronic musical instrument wherein purely digital techniques are utilized for generating the basic waveform train and also keying the waveform train so as to have the customary keying envelope with attack, sustain and decay portions. The wavetrain is a cyclically repeated series of four-term Blackman-Harris window functions, wherein there are preferably eight such functions in each series. A plurality of individual keying envelopes are generated by a piecewise linear technique, and these envelopes are assigned respectively to the waveforms in the series so that the relative amplitudes of the waveforms can change with time over the life of the tone. This results in modulating with time the harmonic content of the tone.
摘要翻译： 一种电子乐器，其中纯数字技术用于产生基本波形列，并且还键入波形串，以具有攻击，维持和衰减部分的常规键控包络。 这是一个周期性重复的四项Blackman-Harris窗口功能，其中每个系列中最好有八个这样的功能。 通过分段线性技术生成多个单独的键控包络，并且将这些包络分别分配给该系列中的波形，使得波形的相对幅度可以随着时间的推移而随时间而变化。 这导致随时间调节音调的谐波含量。
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3.发明授权
公开(公告)号：US4446770A
公开(公告)日：1984-05-08
申请号：US412258
申请日：1982-08-27
申请人： Steven C. Bass
发明人： Steven C. Bass
CPC分类号： G10H7/08 , G10H2250/235 , G10H2250/265 , G10H2250/481 , Y10S84/09 , Y10S84/10
摘要： A tone generation system intended primarily for use in electronic musical instruments wherein a digital representation of a harmonically rich waveform is sampled, and a musical tone is produced therefrom. The stored waveform could be the four term Blackman-Harris window function, which has negligible side lobes and thus greatly attenuated higher harmonics. The stored function is read out at a fixed rate, but the time periods between successive readings of the waveform are varied to thereby vary the frequency of the output signal.
摘要翻译： 一种主要用于电子乐器的乐音产生系统，其中对谐波丰富波形的数字表示进行采样，并从中产生乐音。 存储的波形可以是四项Blackman-Harris窗口函数，其旁瓣可以忽略，从而大大衰减高次谐波。 存储的功能以固定的速率读出，但是波形的连续读数之间的时间段是变化的，从而改变输出信号的频率。
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4.发明授权
公开(公告)号：US4351219A
公开(公告)日：1982-09-28
申请号：US190631
申请日：1980-09-25
申请人： Steven C. Bass
发明人： Steven C. Bass
CPC分类号： G10H7/08 , G10H2250/235 , G10H2250/265 , G10H2250/481 , Y10S84/09 , Y10S84/10
摘要： A tone generation system intended primarily for use in electronic musical instruments wherein a digital representation of a harmonically rich waveform is sampled, and a musical tone is produced therefrom. The stored waveform could be the four term Blackman-Harris window function, which has negligible side lobes and thus greatly attenuated higher harmonics. The stored function is read out at a fixed rate, but the time periods between successive readings of the waveform are varied to thereby vary the frequency of the output signal.
摘要翻译： 一种主要用于电子乐器的乐音产生系统，其中对谐波丰富波形的数字表示进行采样，并从中产生乐音。 存储的波形可以是四项Blackman-Harris窗口函数，其旁瓣可以忽略，从而大大衰减高次谐波。 存储的功能以固定的速率读出，但波形的连续读数之间的时间段是变化的，从而改变输出信号的频率。
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