公开(公告)号：US3683367A

公开(公告)日：1972-08-08

申请号：US3683367D

申请日：1970-02-12

Applicant: DATAMAX CORP

Inventor： MONROE KENNETH E ,  HARMON SAMUEL T JR

IPC: H03G3/20 ,  H03M1/00 ,  H03K13/02

CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03M1/00 ,  H03M1/18

Abstract: An analog to digital signal converting amplifier with automatic gain control. Input analog signal levels are converted to digital form after passing through a variable gain amplifier device. The digital signals are reconverted to analog form and compared to the input analog levels to produce an error signal which is averaged and used to control the gain of the amplifier device. The analog to digital converted produces a maximum output data indication even through the input level may be excessive. A nonzero difference signal is generated even if the digital output is zero.

Abstract translation: 具有自动增益控制的模数转换放大器。 输入模拟信号电平在通过可变增益放大器器件后转换为数字形式。 数字信号被重新转换为模拟形式并与输入模拟电平进行比较，以产生平均并用于控制放大器器件的增益的误差信号。 模拟数字转换产生的最大输出数据指示即使通过输入电平也可能过大。 即使数字输出为零，也会产生非零差分信号。

公开(公告)号：US3646448A

公开(公告)日：1972-02-29

申请号：US3646448D

申请日：1970-02-16

Applicant: DATAMAX CORP

Inventor： HARMON SAMUEL T JR ,  MONROE KENNETH E

IPC: H04L27/08 ,  H04B1/16

CPC classification number: H04L27/08

Abstract: A data signal communication system including an analog signal transmitter and a receiver for converting the analog signal levels to digital form. The receiver employs an automatic gain control loop including means for generating an error signal related to the difference between the analog input and the analog equivalent of a digital output. The error signal is used to control both loop gain and the quantity of a quadrature component which is combined with the data signal within the automatic gain control loop.

公开(公告)号：US3660761A

公开(公告)日：1972-05-02

申请号：US3660761D

申请日：1970-01-29

Applicant: DATAMAX CORP

Inventor： HARMON SAMUEL T JR ,  MONROE KENNETH E ,  VENTURI GINO

IPC: H04L25/03 ,  H04L1/00 ,  H04B1/10

CPC classification number: H04L25/03019

Abstract: A system for equalizing the phase distortion of a data transmission channel is disclosed wherein the equalizer comprises a fixed delay network and a plurality of selectable delay networks. The fixed delay network exhibits an envelope delay similar to the difference between the characteristic envelope delay for the channel and a desired delay for the channel and the selectable delay networks may be connected therewith in any combination to produce the desired envelope delay. Control means are provided for successively connecting the selectable delay networks to form a successive plurality of test channels. The phase distortion produced by each channel is measured and compared with that produced by each other test channel. The control means includes means for reconnecting the combination of selectable delay networks which produce the smallest value of phase distortion to provide equalization of the channel for data transmission.

Abstract translation: 公开了一种用于均衡数据传输信道的相位失真的系统，其中均衡器包括固定延迟网络和多个可选延迟网络。 固定延迟网络呈现类似于信道的特征包络延迟与信道的期望延迟之间的差异的包络延迟，并且可选延迟网络可以以任何组合连接以产生期望的包络延迟。 提供控制装置用于连续地连接可选择的延迟网络以形成连续的多个测试通道。 测量每个通道产生的相位失真，并与每个测试通道产生的相位相比较。 控制装置包括用于重新连接产生最小相位失真值的可选延迟网络的组合以提供用于数据传输的信道的均衡的装置。

公开(公告)号：US3611144A

公开(公告)日：1971-10-05

申请号：US3611144D

申请日：1969-03-03

Applicant: DATAMAX CORP

Inventor： HARMON SAMUEL T JR ,  ACKLEY JAMES R ,  MONROE KENNETH E

IPC: H04L27/02 ,  H04B1/68 ,  H03D1/22 ,  H04B1/30

CPC classification number: H04L27/02

Abstract: Digital or analog data to be transmitted is employed to amplitude modulate a carrier to generate a single-side-band signal which is provided to a receiver over a communication channel. At the receiver a signal having the frequency of the carrier component of the received signal and a constant phase with respect to the carrier component is derived by multiplying the incoming signal by both the output of a local oscillator and the oscillator output phase shifted by 90* and then comparing the two products to derive a feedback signal for adjusting the phase of the local oscillator. The oscillator output and the 90*shifted oscillator signal are each phase shifted by 45* and separately multiplied by the received signal and the output of the 90* multiplication is differentiated and summed with the other product to derive the original transmitted signal. In an alternate embodiment of the invention a double-side-band signal is detected by a pair of product multipliers having inputs which respectively lead and lag the carrier component of the received signal by 45* . The output of the product multiplier which has the 45* leading input is then differentiated and summed in a weighted manner with the output of the other multiplier to derive the original transmitted signal.