公开(公告)号：US4584692A

公开(公告)日：1986-04-22

申请号：US558340

申请日：1983-12-05

申请人： Hiroyuki Yazuka ,  Isao Nakazawa

发明人： Hiroyuki Yazuka ,  Isao Nakazawa

IPC分类号： H04L27/227 ,  H04B7/10 ,  H04B14/00 ,  H04L27/18 ,  H04K1/10

CPC分类号： H04B7/10 ,  H04B14/008 ,  H04L27/18

摘要： A data transmitting-receiving system including both a transmitter part and a receiver part. The transmitter part transmits a modulation signal on one of the vertically and horizontally polarized waves and, at the same time, transmits a carrier on the other of the waves. The modulation signal on one of the waves is received and demodulated by the receiver part with the carrier on the other of the waves also received by the receiver part.

摘要翻译： 一种包括发射机部分和接收机部分的数据发射 - 接收系统。 发射机部分在垂直和水平极化波中的一个上发送调制信号，并且同时在另一个波上发送载波。 一个波上的调制信号由接收机部分接收和解调，载波在接收机部分也接收的另一个波长上。

公开(公告)号：US4499426A

公开(公告)日：1985-02-12

申请号：US429380

申请日：1982-09-30

申请人： Norman W. Parker

发明人： Norman W. Parker

IPC分类号： H03C3/00 ,  H04B1/68 ,  H04B14/00 ,  G06G7/62 ,  H03D5/00

CPC分类号： H04B1/68 ,  H03C3/005 ,  H04B14/006

摘要： A baseband discriminator decodes a pair of trigonometric transform function signals, sin f(t) and cos f(t), to provide an original audio signal f(t) by first deriving the derivative of the audio signal from the pair of trigonometric signals and integrating that derivative. The discriminator is used in a new system of SSB transmission termed "transform modulation" and also in FM transmission.

摘要翻译： 基带鉴频器通过一对三角函数信号sin f（t）和cos f（t）来解码，以通过首先从一对三角信号中导出音频信号的导数来提供原始音频信号f（t），以及 整合该衍生物。 鉴别器用于称为“变换调制”的SSB传输的新系统中，也用于FM传输。

公开(公告)号：US4462114A

公开(公告)日：1984-07-24

申请号：US431425

申请日：1982-09-30

申请人： Norman W. Parker

发明人： Norman W. Parker

IPC分类号： H03C3/00 ,  H04B1/68 ,  H04B14/00 ,  H03B25/00 ,  H04B1/62

CPC分类号： H03C3/005 ,  H04B1/68 ,  H04B14/006

摘要： A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver, the signal can be recovered by first deriving the Hilbert transform of the sine transform, and multiplying it by the signum of the derivative of the original audio signal to obtain the cosine transform. The sine and cosine transforms are then decoded to obtain the original audio signal. A circuit for deriving the signum of the derivative of a signal is disclosed.

摘要翻译： 单个载波由作为音频信号的变换（作为正弦函数）的信号进行幅度调制，并且去除一组边带。 在接收机中，可以通过首先导出正弦变换的希尔伯特变换，并将其乘以原始音频信号的导数的符号来获得余弦变换来恢复信号。 然后对正弦和余弦变换进行解码以获得原始音频信号。 公开了一种用于导出信号导数的符号的电路。

公开(公告)号：US4458271A

公开(公告)日：1984-07-03

申请号：US312293

申请日：1981-10-16

申请人： Winfried Horstmann

发明人： Winfried Horstmann

IPC分类号： H04N11/00 ,  G11B5/027 ,  H04B1/66 ,  H04B14/00 ,  H04N7/12 ,  H04N11/24 ,  H04N9/491 ,  G11B5/02 ,  H04N5/91 ,  H04N9/32

CPC分类号： H04B14/006 ,  G11B5/027 ,  H04B1/66

摘要： A method and a circuit for transmitting or storing a wide-band signal in several, narrow-band channels, wherein frequency modulation and demodulation occur in the wideband channel. The uniformity of the transmission characteristics of the entire system is improved by obviating the necessity for multiple modulators and demodulators in the individual transmission channels.

摘要翻译： 一种用于在多个窄带信道中发送或存储宽带信号的方法和电路，其中在宽带信道中发生频率调制和解调。 通过避免在各个传输信道中需要多个调制器和解调器来改善整个系统的传输特性的均匀性。

公开(公告)号：US4433604A

公开(公告)日：1984-02-28

申请号：US304470

申请日：1981-09-22

申请人： Granville E. Ott

发明人： Granville E. Ott

IPC分类号： H03M13/00 ,  G10H1/00 ,  G10L19/02 ,  G11B3/00 ,  G11B20/10 ,  H03M7/30 ,  H04B1/66 ,  H04B14/00 ,  H04B14/04 ,  G10H1/02

CPC分类号： G10H1/0041 ,  G10H2250/161 ,  G10H2250/235 ,  Y10S84/09

摘要： An apparatus for encoding and decoding musical signals in digital form employs conversion to the frequency domain. Discrete Fourier transform coefficients are calculated from time domain digital data at selected frequencies which are organized in sets of octavely related frequencies. Selecting frequencies in this manner greatly reduces the data rate by eliminating coefficients for many higher frequencies without a great loss of fidelity because the provision of a predetermined number of frequencies in each octave approximates the tonal response of the human ear. A further refinement is selection of frequencies to correspond to the frequencies of musical notes where the greatest energy can be expected. The complex number discrete Fourier transform coefficients can be converted to polar form with logarithmic magnitude values resulting in a further data rate reduction because the human ear is responsive only to logarithmic amplitude and because the human ear is relatively insensitive to phase angle enabling fewer bits to be used to represent the angular part without loss of fidelity. A digital filter can be easily implemented by manipulation of the magnitude part of the discrete Fourier transform coefficients.

摘要翻译： 用于以数字形式对音乐信号进行编码和解码的装置采用转换到频域。 离散傅里叶变换系数是以选定频率的时域数字数据计算的，这些数字数据被组织在一组八倍频相关的频率上。 以这种方式选择频率通过消除许多更高频率的系数而大大降低了数据速率，而没有很大的保真度损失，因为在每个八度中提供预定数量的频率近似于人耳的音调响应。 进一步的改进是选择频率以对应于可以预期最大能量的音符的频率。 复数离散傅立叶变换系数可以被转换成具有对数幅度值的极坐标形式，从而进一步降低数据速率，因为人耳只响应于对数振幅，并且因为人耳对相位角度相对不敏感，因此能够使较少的位为 用于表示角部分而不损失保真度。 数字滤波器可以通过操纵离散傅立叶变换系数的大小部分来容易地实现。

公开(公告)号：US4363129A

公开(公告)日：1982-12-07

申请号：US215589

申请日：1980-12-11

申请人： Jona Cohn ,  Allen L. Davidson ,  Anthony P. van den Heuvel

发明人： Jona Cohn ,  Allen L. Davidson ,  Anthony P. van den Heuvel

IPC分类号： H04B7/155 ,  H04B7/26 ,  H04B14/00 ,  H04H20/67 ,  H04B7/16

CPC分类号： H04H20/67 ,  H04B14/006 ,  H04B7/15528 ,  H04B7/2625

摘要： Simulcast distortion in a receiver when using a same-frequency repeater is minimized by applying double modulation to a signal that is broadcast to the same-frequency repeater. A voice signal is applied without delay as AM on a carrier to a modulation index of up to 30%, and the same signal is also applied as FM on the same carrier with a time delay equal to the time delay in the same-frequency repeater. The same-frequency repeater detects the AM and applies the detected signal as FM on a carrier that is rebroadcast. Received FM signals are thus delayed by substantially the same amount whether they are received from the original broadcast or the same-frequency repeater.

摘要翻译： 通过对广播到同频中继器的信号应用双调制来最小化接收机中使用同频中继器时的模拟失真。 无延迟地将语音信号作为载波上的AM施加到高达30％的调制指数，并且相同的信号也作为FM施加在同一载波上，时间延迟等于同频中继器中的时间延迟 。 相同频率的中继器检测到AM，并将检测到的信号作为FM进行重播。 因此，无论接收到的FM信号是从原始广播还是从同频中继器接收到的，FM信号都被延迟了大致相同的量。

公开(公告)号：US4225885A

公开(公告)日：1980-09-30

申请号：US877382

申请日：1978-02-13

申请人： Peter Lux ,  J/rgen Petzold

发明人： Peter Lux ,  J/rgen Petzold

IPC分类号： H03M7/30 ,  G06T9/00 ,  H04B14/00 ,  H04N1/40 ,  H04N1/41 ,  H04N19/154 ,  G06K9/12

CPC分类号： H04N19/154 ,  H04N19/60

摘要： A method and apparatus to reduce the redundancy for the transmission or storage of picture signals using transforms. The basis coefficients are arranged in a sequence and thereafter quantized in the customary manner. The basis coefficients obtained from the transformation are sequentially examined to see if they exceed a predetermined value, for example the average value across the entire picture. The number of times the value is exceeded is counted. If, in a sequence class, the number of coefficients exceeding the predetermined value is more than half the total number in the sequence class then the associated sequences are quantized with a larger number of bits. For this purpose, activity classes are formed which indicate which sequences in the picture are active and the characteristic of the quantizer is controlled by this class information.

摘要翻译： 一种减少用于使用变换来传输或存储图像信号的冗余的方法和装置。 基准系数按顺序排列，然后以常规方式量化。 依次检查从变换获得的基准系数，以查看它们是否超过预定值，例如整个图像的平均值。 计算超出值的次数。 如果在序列类中，超过预定值的系数数量大于序列类别中总数的一半，则相关序列以较大数目的比特量化。 为此，形成活动类别，其指示图片中的哪些序列是活动的，并且量化器的特性由该类信息控制。

公开(公告)号：US4125812A

公开(公告)日：1978-11-14

申请号：US807440

申请日：1977-06-17

申请人： John D. Polonio

发明人： John D. Polonio

IPC分类号： H04B3/04 ,  H03K5/003 ,  H04B14/00 ,  H04L25/06 ,  H04B1/10 ,  H03K5/00

CPC分类号： H04B14/006 ,  H03K5/003

摘要： Apparatus for baseline restoration in an AC-coupled signal is comprised of a differentiation circuit followed by an integration circuit to receive the signal and continually restore its DC reference. Both circuits are initially set to the DC reference, and reset after a lapse of some predetermined period based upon the worst case signal-to-noise ratio anticipated for the system. Transmission is terminated, or interrupted, before resetting. A header may be used to signal resumption of transmission to the apparatus in an asynchronous receiving mode. In a synchronous receiving mode, the transmission is simply interrupted at each time the apparatus is reset.

摘要翻译： AC耦合信号中的基线恢复装置由差分电路组成，后面是积分电路以接收信号并连续恢复其DC参考。 两个电路初始设置为直流基准，并且在基于系统预期的最坏情况的信噪比之后经过一些预定周期后复位。 复位前传输终止或中断。 可以使用报头来以异步接收模式来信号传输到设备的信号。 在同步接收模式下，每次设备复位时，传输简单地被中断。

公开(公告)号：US4069396A

公开(公告)日：1978-01-17

申请号：US722401

申请日：1976-09-13

申请人： Friedemann Vollnhals ,  Klaus Wintzer

发明人： Friedemann Vollnhals ,  Klaus Wintzer

IPC分类号： H04M11/00 ,  H03M1/00 ,  H04B14/00 ,  H04L29/00 ,  H04M1/253 ,  H04M19/08

CPC分类号： H04M1/253 ,  H03M1/002 ,  H04M19/08

摘要： Power saving means is shown for use with a converter circuit in a telephone switching installation. The converter circuit comprises an analog-to-digital converter and a digital-to-analog converter. The voltage supply for the converter circuit is switched on only upon the appearance of analog signals to be converted into digital signals or digital signals to be converted into analog signals.

摘要翻译： 节电装置被示出用于电话交换设备中的转换器电路。 转换器电路包括模数转换器和数模转换器。 转换器电路的电源仅在出现要转换为数字信号的模拟信号或数字信号转换为模拟信号时才接通。

公开(公告)号：US4020288A

公开(公告)日：1977-04-26

申请号：US623349

申请日：1975-10-17

申请人： Maurice Georges Bellanger ,  Jacques Lucien Daguet

发明人： Maurice Georges Bellanger ,  Jacques Lucien Daguet

IPC分类号： H04B3/10 ,  H03H17/00 ,  H03H17/02 ,  H04B14/00 ,  H04J1/05 ,  H04J1/08 ,  H04J1/14 ,  H04J11/00 ,  H04L5/00 ,  H04L5/06 ,  H04L25/02

CPC分类号： H04J1/08 ,  H04J1/14 ,  H04L5/06

摘要： Parallel data transmission system in which the data signals are converted to multilevel digital signals and transmitted through the channels of a frequency division multiplex system. To compensate for the delays between the data signals received in the various channels of the multiplex, a pilot signal is transmitted in each channel in the form of a signal which only has a real component. At the receiver side a filter circuit is used which comprises a first fixed coefficient part at whose input the data signal is multiplied by a component of the received pilot signal and a second part having two variable coefficients which are derived from the two components of the received pilot signal.

摘要翻译： 并行数据传输系统，其中数据信号被转换为多电平数字信号并通过频分复用系统的信道传输。 为了补偿在多路复用的各种信道中接收到的数据信号之间的延迟，导频信号以仅具有实际分量的信号的形式在每个信道中发送。 在接收机侧，使用滤波电路，其包括第一固定系数部分，其输入端将数据信号乘以接收到的导频信号的分量，以及具有两个可变系数的第二部分，该两个可变系数是从接收到的两个分量导出的 导频信号。