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公开(公告)号：US4812815A
公开(公告)日：1989-03-14
申请号：US923163
申请日：1986-10-24
IPC分类号： H03M1/00
CPC分类号： H03M3/346 , H03M3/50 , H03M7/3031 , H03M7/304
摘要： A D/A converter system for converting digital signal to analog signal includes a circuit for converting digital signal such as PCM signal to pulse density modulation signal, and an analog low-pass filter for converting the pulse density modulation signal to analog signal by removing noise from the pulse density modulation signal.
摘要翻译： 用于将数字信号转换为模拟信号的AD / A转换器系统包括用于将诸如PCM信号的数字信号转换为脉冲浓度调制信号的电路和用于通过去除噪声从而将脉冲密度调制信号转换为模拟信号的模拟低通滤波器 脉冲密度调制信号。
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2.发明授权
公开(公告)号：US4249245A
公开(公告)日：1981-02-03
申请号：US22378
申请日：1979-03-20
CPC分类号： G06F15/0225 , G06F3/023
摘要： A confirmation sound generation system for developing a confirmation sound upon actuation of keys included in a key input means of an electronic apparatus. A determination means is provided for determining whether the presently conducted key input operation is effective. The determination means develops a determination output for activating said confirmation sound generation system only when an effective key input operation is conducted.
摘要翻译： 一种确认声音产生系统，用于在致动包括在电子设备的键输入装置中的键时显示确认声音。 提供用于确定当前进行的键输入操作是否有效的确定装置。 确定装置仅在进行有效键输入操作时才产生用于激活所述确认声音产生系统的确定输出。
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公开(公告)号：US4334279A
公开(公告)日：1982-06-08
申请号：US138910
申请日：1980-04-11
申请人： Kazumitsu Miyakoshi , Koji Maekawa
发明人： Kazumitsu Miyakoshi , Koji Maekawa
CPC分类号： G06F15/0225 , G06F3/1407
摘要： A display circuit adapted for use in an electronic calculator comprises a circuit for enabling communication between the calculator and the operator to inquire as to the value of one or more variables and a circuit for pointing out the kind of a variable which is presently subject to inquiry and input data items entered by the operator. In another form of the present invention, the display circuit comprises a circuit for detecting a space or separable portion between two algebraic expressions, a circuit for terminating the indication just before the position of the space, and a circuit for subsequently initiating indications of items following the space from the top digit of a display. In a further preferred form of the present invention, the display circuit comprises a circuit for detecting a separation mark between two equations, a counter for counting the serial number of the separation mark, a circuit for showing the serial number of the separation mark in addition to the results of the calculation obtained by one of the equations.
摘要翻译： 适用于电子计算器的显示电路包括一个电路，用于使得计算器和操作者之间的通信能够查询一个或多个变量的值，以及用于指出目前正在进行查询的变量的种类的电路 并输入操作员输入的数据项。 在本发明的另一形式中，显示电路包括用于检测两个代数表达式之间的空间或可分离部分的电路，用于在空间的位置之前终止指示的电路，以及用于随后启动跟随的项目的指示的电路 从显示屏的顶部数字的空格。 在本发明的另一优选形式中，显示电路包括用于检测两个方程之间的分离标记的电路，用于计数分离标记的序列号的计数器，另外用于显示分离标记的序列号的电路 对于通过一个等式获得的计算结果。
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公开(公告)号：US4817025A
公开(公告)日：1989-03-28
申请号：US154466
申请日：1988-02-05
CPC分类号： H03H17/0225 , H03H17/0607
摘要： A digital filter of linear phase non-cyclic type comprises a shift register composed of serially connected delay elements with a specified delay time. The outputs from the individual delay elements are multiplied and added so that the output sampling frequency is twice that of the input sampling frequency which enters the shift register. The number of multiplications is significantly reduced by making the number of output lines from the delay elements to be odd and by placing adders between the shift register and the device for carrying out multiplications. An alternative method is to use read only memories instead of the means for carrying out multiplications.
摘要翻译： 线性相位非循环型数字滤波器包括由具有指定延迟时间的串联延迟元件组成的移位寄存器。 来自各个延迟元件的输出被相乘并相加，使得输出采样频率是进入移位寄存器的输入采样频率的两倍。 通过使来自延迟元件的输出线的数量为奇数，并且通过在移位寄存器和用于进行乘法的装置之间放置加法器来显着地减少乘法次数。 一种替代方法是使用只读存储器而不是执行乘法的方法。
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