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1. 发明授权

US4683795A Periodic wave form generation by recyclically reading amplitude and frequency equalized digital signals 失效
标题翻译：通过循环读取振幅和频率均衡数字信号的周期波形生成
公开(公告)号：US4683795A
公开(公告)日：1987-08-04
申请号：US925477
申请日：1986-10-31
申请人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
发明人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
IPC分类号： G10H1/057 , G10H1/02 , G10H7/00
CPC分类号： G10H1/0575
摘要： An electronic musical instrument includes a memory in which digital samples of an aperiodic waveform are stored. Digital samples stored in a first portion of the memory represent a rapidly rising portion of the waveform and those stored in a second portion of the memory represent a rapidly declining portion of the waveform whose amplitude and spectral energy distributions are equalized. The first memory portion is addressed in forward scan and subsequently the second memory portion is addressed recyclically in forward and rearward scans to generate an output waveform having a first part corresponding to the rising waveform section and a second part corresponding to a series of the recyclically addressed versions of the equalized waveform section. After delivery of the first part of the output waveform, a monotonically declining envelope is impressed upon the amplitudes and the spectral energy distributions of the second part.
摘要翻译：电子乐器包括存储非周期波形的数字样本的存储器。存储在存储器的第一部分中的数字样本表示波形的快速上升部分，并且存储在存储器的第二部分中的数字样本表示其幅度和光谱能量分布相等的波形的快速衰减部分。第一存储器部分在正向扫描中寻址，随后第二存储器部分在向前和向后扫描中以循环方式寻址，以产生具有对应于上升波形段的第一部分的输出波形，以及与一系列循环寻址版本的均衡波形部分。输出波形的第一部分输出后，第一部分的幅度和频谱能量分布将单调递减的包络线施加压力。

2. 发明授权

US4701872A Aperiodic waveform generation using stored markers identifying scaled waveform sections 失效
标题翻译：使用存储的标记识别缩放波形段的非周期波形生成
公开(公告)号：US4701872A
公开(公告)日：1987-10-20
申请号：US676840
申请日：1984-11-30
申请人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
发明人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
IPC分类号： G10H7/02 , G11B20/10 , G06F1/02 , G10H1/00 , G10H1/02
CPC分类号： G10H7/02 , G10H2250/645
摘要： In an apparatus for generating an aperiodic waveform having a gradually decaying envelope, a sequence of digital samples representing the magnitude of the waveform at sample points is stored in a memory. The stored digital samples are grouped into at least first and second continuous portions, the second portion including that portion of the sequence in which none of the digital samples has a magnitude exceeding 1/n the magnitude of the largest of the digital samples, where n is an integer greater than unity, each of the digital samples of the second portion being scaled by a factor of n. The memory further stores a code indicating the beginning of the second portion. An address counter develops an address signal for sequentially addressing the stored digital samples and code from the memory in response to clock pulses. When the stored code is addressed, an additional clock pulse is supplied from a code detector to the address counter. Each of the addressed digital samples of the first and second portions is scaled and converted to a signal having a magnitude corresponding to the magnitude of the associated digital sample of the sequence.
摘要翻译：在用于产生具有逐渐衰减的包络的非周期波形的装置中，将表示采样点处的波形的幅度的数字样本序列存储在存储器中。存储的数字样本被分组为至少第一和第二连续部分，第二部分包括其中没有一个数字样本具有超过数字样本中最大的数字的幅度的1 / n的序列的那部分，其中n 是大于1的整数，第二部分的每个数字样本被缩放n的因子。存储器还存储指示第二部分的开始的代码。地址计数器产生地址信号，用于响应于时钟脉冲从存储器顺序寻址存储的数字样本和代码。当存储的代码被寻址时，从代码检测器向地址计数器提供附加的时钟脉冲。第一部分和第二部分的寻址数字样本中的每一个被缩放并转换成具有对应于序列的相关联的数字样本的大小的幅度的信号。

3. 发明授权

US4638710A Periodic waveform generation by nonrecyclically reading lower frequency audio samples and recyclically reading higher frequency audio samples 失效
标题翻译：通过非周期性地读取较低频率的音频样本并循环读取较高频率的音频样本来定期产生波形
公开(公告)号：US4638710A
公开(公告)日：1987-01-27
申请号：US667622
申请日：1984-11-02
申请人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
发明人： Masatsugu Kitamura , Kikuji Wagatsuma , Tokumi Watanabe , Naoki Yamashita , Hiroshi Yoshida
IPC分类号： G10H7/00 , G10H1/057 , G10H1/02
CPC分类号： G10H1/0575
摘要： An electronic musical instrument includes a first memory in which audio samples of lower frequency components of an aperiodic waveform are stored and a second memory in which audio samples of a higher frequency components of the waveform are stored. Digital samples stored in a first portion of the second memory represent a rapidly rising portion of the higher frequency waveform and those stored in a second portion of the memory represent a rapidly declining portion of the higher frequency waveform whose amplitude and spectral energy distribution profiles are preferably equalized. The first memory is addressed throughout in forward scan to generate a first output waveform. The second memory is addressed in an initial forward scan throughout its first and second portions and the direction of scan is reversed at the end of the second portion to recyclically address it in rearward and forward directions to generate a second output waveform, which is combined with the first output waveform. A monotonically declining envelope is preferably impressed upon the second output waveform to reconstruct the original declining amplitude and spectral energy distribution profile.
摘要翻译：电子乐器包括：第一存储器，其中存储有非周期波形的较低频率分量的音频样本;以及第二存储器，其中存储有波形的较高频率分量的音频样本。存储在第二存储器的第一部分中的数字样本表示较高频率波形的快速上升部分，并且存储在存储器的第二部分中的数字样本表示较高频率波形的快速下降部分，其幅度和频谱能量分布轮廓优选地平衡第一个存储器在正向扫描中被整个寻址以产生第一个输出波形。第二存储器在其第一和第二部分的初始正向扫描中寻址，并且扫描方向在第二部分的末端反转，以在向后和向前方向上循环地寻址它，以产生第二输出波形，其与第一个输出波形。单调下降的包络优选地印在第二输出波形上以重构原始衰减幅度和光谱能量分布曲线。

4. 发明授权

US4618851A Apparatus for reproducing signals pre-stored in a memory 失效
标题翻译：用于再现预先存储在存储器中的信号的装置
公开(公告)号：US4618851A
公开(公告)日：1986-10-21
申请号：US643065
申请日：1984-08-22
申请人： Tokumi Watanabe
发明人： Tokumi Watanabe
IPC分类号： H03B28/00 , G01H7/00 , G10G3/04 , G10H7/00 , G10H7/02 , G11C7/02 , H03M1/00 , G10H1/02 , G10H3/03 , H03M1/70
CPC分类号： G10H7/02 , G10G3/04 , H03M1/1047 , G10H2250/645
摘要： An apparatus for reproducing signals which are pre-stored in a memory, comprises a memory pre-stored with signals made up of a level and gain change codes, a detecting circuit for detecting the gain change code from a signal read out from the memory, and a converting circuit supplied with the signal read out from the memory, for producing a reproduced signal having a waveform which is essentially the same as the original analog signal waveform. The level code is an original analog signal which is amplified, sampled, and digitally coded. The original analog signal has a level smaller than threshold values in a small level region. The gain change code has predetermined values and replaces the level code at least for a certain period from a predetermined time in the small level region. The converting circuit is variably controlled of a gain thereof after receiving an output detection signal of the detecting circuit so as to attenuate the level of the signal read out from the memory to an extent complementary to the amplification performed at the time when the signal is pre-stored in the memory, and subjects the signal read out from the memory to a digital-to-analog conversion regardless of whether the detection signal is received.
摘要翻译：一种用于再现预先存储在存储器中的信号的装置，包括一个预存储有由一个电平和增益改变码组成的信号的存储器，一个检测电路，用于从存储器读出的信号中检测增益改变码，以及转换电路，其被提供有从存储器读出的信号，用于产生具有与原始模拟信号波形基本相同的波形的再现信号。电平代码是原始模拟信号，被放大，采样和数字编码。原始模拟信号的电平小于小电平区域中的阈值。增益改变码具有预定值，并且从小级别区域中的预定时间至少在一段时间内替换电平代码。在接收到检测电路的输出检测信号之后，转换电路可变地控制其增益，以便将从存储器读出的信号的电平衰减到在信号预先时执行的放大的补充程度存储在存储器中，并且将从存储器读出的信号进行数模转换，而不管接收到检测信号。

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