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1. 发明授权

US4003002A Modulation and filtering device 失效
标题翻译：调制滤波装置
公开(公告)号：US4003002A
公开(公告)日：1977-01-11
申请号：US608392
申请日：1975-08-27
申请人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus VAN Gerwen , Hendrik Arie VAN Essen
发明人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus VAN Gerwen , Hendrik Arie VAN Essen
IPC分类号： H03C1/60 , H03C1/00 , H03H17/06 , H04L27/04 , H03K7/00
CPC分类号： H03C1/00 , H03H17/06 , H04L27/04
摘要： A digital data transmitter is described, whose line carrier frequency need not be an integral multiple of one half the clock frequency of the digital input signal. Use is made of a digital filter for increasing the sampling frequency to a value which is twice the modulator carrier wave frequency.
摘要翻译：描述了数字数据发射器，其线载波频率不必是数字输入信号的时钟频率的一半的整数倍。使用数字滤波器将采样频率提高到调制器载波频率的两倍。

2. 发明授权

US4121296A Digital signal processing arrangement 失效
标题翻译：数字信号处理装置
公开(公告)号：US4121296A
公开(公告)日：1978-10-17
申请号：US808095
申请日：1977-06-20
申请人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus Van Gerwen , Hendrik Arie Van Essen
发明人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus Van Gerwen , Hendrik Arie Van Essen
IPC分类号： H03H15/00 , G06F17/15 , H03H17/00 , H03H17/02 , H03H19/00 , H04L27/04 , G06F15/34
CPC分类号： G06F17/15 , H03H17/0227 , H03H17/0233 , H04L27/04
摘要： Digital signal processing arrangement such as a digital filter for computing output signal samples which are each equal to the sum of products of a given plurality of pairs (for example N) of input signal samples. One of the input signal samples of the pair is, for example, formed each time by a sample x(n) of a digital signal to be filtered, the other input signal sample of the pair by a filter coefficient z(n), wherein either the sample x(n) or the filter coefficient z(n) can assume only a limited number of values 0, .+-.A.sub.1, .+-.A.sub.2, . . . .+-.A.sub.M, M being much smaller than N. In the case x(n) can assume only this limited number of values, z(n) is first multiplied, owing to the x(n) belonging to the pair, by the sign of x(n) for generating a product of the form z(n). sgn [x(n)]. In-dependent of the magnitude of n(n) this product is applied to an accumulator which corresponds with this magnitude of x(n). N products have been applied to one of the M accumulators the partial sums stored therein are multiplied by the magnitude .vertline.x(n).vertline. corresponding therewith and the products obtained are added together.
摘要翻译：数字信号处理装置，例如用于计算输出信号样本的数字滤波器，每个输出信号样本各自等于给定多对（例如N个）输入信号样本的乘积之和。例如，该对的输入信号采样之一每次由要滤波的数字信号的采样x（n）形成，该对的另一个输入信号采样通过滤波器系数z（n），其中样本x（n）或滤波器系数z（n）可以仅采用有限数量的值0，+/- A1，+/- A2，。。 +/- AM，M远小于N.在x（n）可以仅假设这个有限数量的值的情况下，由于属于该对的x（n），z（n）首先乘以 x（n）的符号，用于生成形式为z（n）的乘积。 sgn [x（n）]。依赖于n（n）的大小，该乘积被施加到对应于x（n）的这个大小的累加器。已经将N个产品应用于M个累加器中的一个，其中存储的部分和乘以与其对应的幅度| x（n）|，并将获得的乘积相加。

3. 发明授权

US3997773A Interpolating digital filter with input buffer 失效
标题翻译：插入数字滤波器与输入缓冲器
公开(公告)号：US3997773A
公开(公告)日：1976-12-14
申请号：US607611
申请日：1975-08-25
申请人： Hendrik Arie Van Essen , Nicolaas Alphonsus Maria Verhoeckx , Wilfred Andre Maria Snijders
发明人： Hendrik Arie Van Essen , Nicolaas Alphonsus Maria Verhoeckx , Wilfred Andre Maria Snijders
IPC分类号： H03H17/00 , H03H17/06 , G06F7/38 , G06F15/34
CPC分类号： H03H17/0657
摘要： A non-recursive interpolating digital filter for generating, output code works, at an arbitrary rational ratio between the input and output sampling frequencies. The input code words are entered and stored in a buffer, and entered into a storage device at predetermined times determined by a controlled pulse generator.
摘要翻译：一种非递归内插数字滤波器，用于以输入和输出采样频率之间的任意合理比率产生，输出代码工作。输入的代码字被输入并存储在缓冲器中，并以由受控脉冲发生器确定的预定时间进入存储装置。

4. 发明授权

US4005265A Videophone system synchronizer 失效
标题翻译：可视电话系统同步器
公开(公告)号：US4005265A
公开(公告)日：1977-01-25
申请号：US535044
申请日：1974-12-19
申请人： Nicolaas Alphonsus Maria Verhoeckx , Herman VAN DER Hoff , Cornelis Henricus Johannes Vos , Johannes Wilhelmus Coenders
发明人： Nicolaas Alphonsus Maria Verhoeckx , Herman VAN DER Hoff , Cornelis Henricus Johannes Vos , Johannes Wilhelmus Coenders
IPC分类号： H04N7/085 , H04N7/088 , H04N7/14 , H04N7/56 , H04N5/10
CPC分类号： H04N7/088 , H04N7/085 , H04N7/147 , H04N7/56
摘要： In a videophone system sound, video, synchronizing and signalling signals are to be transmitted through a single pair of telephone cables of existing telephone communications. In that case sound, synchronizing and signalling signals are transmitted in a digital form and the video signals are transmitted in an analog form. It is then possible to achieve optimum picture quality at the given bandwidth of the existing telephone communications. If for the given bandwidth the video signal were also digitalized, this would be at the expense of the picture quality. However, it is then necessary to transmit information regarding clock pulses for decoding at the receiver end. To be able to synchronize at the receiver end only on two frequencies instead of on clock pulse frequency, line frequency and field frequency, the information regarding the clock pulses is cotransmitted in such a manner that a clock pulse generator at the receiver end can be synchronized therewith which generator supplies clock pulses. A field code word is also transmitted during each field flyback period. In the receiver the regenerated clock pulses are divided in frequency in a divider stage and the divided signal is compared with the detected code word in a synchronizing verification circuit. As long as there is no phase equality between component signals and detected code word, an output signal from the verification circuit resets the divider stage.
摘要翻译：在可视电话系统中，声音，视频，同步和信令信号将通过现有电话通信的一对电话线传输。在这种情况下，以数字形式发送声音，同步和信号信号，并以模拟形式发送视频信号。然后可以在现有电话通信的给定带宽下实现最佳图像质量。如果对于给定的带宽，视频信号也被数字化，这将以牺牲图像质量为代价。然而，有必要在接收端发送关于用于解码的时钟脉冲的信息。为了能够在接收端仅在两个频率上而不是在时钟脉冲频率，线路频率和场频率上进行同步，关于时钟脉冲的信息被共同传送，使得接收机端的时钟脉冲发生器可以被同步发生器提供时钟脉冲。在每个场回扫期间也会发送场码字。在接收机中，再生的时钟脉冲在分频器级中以频率分频，并且将分频信号与同步验证电路中的检测码字进行比较。只要分量信号和检测码字之间没有相位相等，来自验证电路的输出信号复位分频器级。

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