公开(公告)号：US5822339A

公开(公告)日：1998-10-13

申请号：US655535

申请日：1996-05-30

Applicant: Billy D. Hart

Inventor： Billy D. Hart

IPC: H03M13/05 ,  H04L1/00 ,  H04L27/00 ,  H04L27/233 ,  H03M13/00 ,  G06F11/00 ,  H04L7/00 ,  H04L25/40

CPC classification number: H04L1/0047 ,  H03M13/05 ,  H04L27/2332 ,  H04L1/0057 ,  H04L2027/003 ,  H04L2027/0053

Abstract: The invention is a way to detect and correct data inversions or other phase ambiguities in a modem's data, without incurring a significant penalty in error rate performance, throughput, or overhead, by making a particular use of the error detection and correction (EDAC) code which would typically be used for random errors. The decoder is set up so that the inverted data or out-of-phase data generates a distinctive syndrome which signals to a phase corrector.

Abstract translation: 本发明是通过特别使用错误检测和校正（EDAC）代码来检测和校正调制解调器数据中的数据反相或其他相位模糊度的方法，而不会对错误率性能，吞吐量或开销造成重大损失 这通常用于随机错误。 解码器被设置为使得反相数据或异相数据产生向相位校正器发信号的特征性综合征。

公开(公告)号：US4855944A

公开(公告)日：1989-08-08

申请号：US94250

申请日：1987-09-04

Applicant: Billy D. Hart

Inventor： Billy D. Hart

IPC: H03K3/84

CPC classification number: H03K3/84

Abstract: Pseudorandom noise having a predetermined frequency spectrum is generated by implementing a finite impulse response filter as an integral part of a feedback shift register sequence generator.

Abstract translation: 通过实施作为反馈移位寄存器序列发生器的组成部分的有限脉冲响应滤波器来产生具有预定频谱的伪随机噪声。

公开(公告)号：US07266161B1

公开(公告)日：2007-09-04

申请号：US10606724

申请日：2003-06-26

Applicant: Billy D. Hart ,  Steven L. White

Inventor： Billy D. Hart ,  Steven L. White

IPC: H03D3/00

CPC classification number: H03D3/006

Abstract: An apparatus and method provides efficient parallel processing for use with a single-bit sampler that provides single-bit samples at a high sample rate. A serial-to-parallel converter converts the single-bit samples into parallel single-bit samples at a reduced sample rate. A digital quadrature mix performs a frequency shift to the parallel single-bit samples and simultaneously performs a real-to-complex conversion of the parallel single-bit samples from the serial-to-parallel converter to provide parallel I and Q output values at an intermediate frequency. The serial-to-parallel converter has shift register stages that provide a memory for use in functional realization of a boxcar filter and decimation-by-two in the digital quadrature mix. The digital quadrature mix utilizes logic to route and invert the parallel single-bit samples resulting in the parallel I and Q single-bit output values. Additional filter and decimate stages may be used to process the parallel I and Q single-bit output values.

Abstract translation: 一种装置和方法提供了与单位采样器一起使用的高效并行处理，该采样器以高采样率提供单位采样。 串并转换器以降低的采样率将单位采样转换为并行单位采样。 数字正交混合器对并行单比特采样进行频移，并且同时对串并转换器的并行单比特采样进行实 - 复转换，从而提供并行I和Q输出值 中频。 串并转换器具有移位寄存器级，其提供用于盒式滤波器的功能实现的存储器，并且在数字正交混合中逐个抽取。 数字正交混合使用逻辑来对并行单位采样进行路由和反相，产生并行I和Q单位输出值。 附加的滤波器和抽取级可用于处理并行I和Q单位输出值。

公开(公告)号：US4750214A

公开(公告)日：1988-06-07

申请号：US873242

申请日：1986-06-11

Applicant: Billy D. Hart ,  Maurice W. Peterson, Jr.

Inventor： Billy D. Hart ,  Maurice W. Peterson, Jr.

IPC: H03D3/00 ,  H03D3/22 ,  H03D7/16 ,  H04B1/16

CPC classification number: H03D3/007 ,  H03D2200/0035 ,  H03D2200/005 ,  H03D3/22 ,  H03D7/161 ,  H03D7/165

Abstract: FM signals are demodulated with lower distortion and expenditure of less computing time by digitizing the signals using an A/D converter of predetermined sample frequency and down-converting the signals to their base band quadrature components. The quadrature components are delayed by one sample period, and the complex cross-product of current quadrature components and the delayed quadrature components from the immediately preceding A/D sample period is taken. The arctangent of the resulting cross-product is taken by calculating the ratio of the imaginary and real components thereof to produce a value which is representative of the original modulating signal.

Abstract translation: 通过使用预定采样频率的A / D转换器对信号进行数字化并且将信号下变频到它们的基带正交分量，FM信号以更低的失真和更少的计算时间的消耗被解调。 正交分量被延迟一个采样周期，并且采用当前正交分量与紧接在前的A / D采样周期的延迟正交分量的复杂交叉积。 所得到的交叉积的反正切是通过计算其虚部和实分量的比率来产生代表原始调制信号的值而得到的。

公开(公告)号：US06792055B1

公开(公告)日：2004-09-14

申请号：US09621805

申请日：2000-07-21

Applicant: Billy D. Hart

Inventor： Billy D. Hart

IPC: H04L2708

CPC classification number: H03G3/3036 ,  H04L25/067

Abstract: A data communications receiver incorporating soft decision error correction decoding and a means to set the amplitude or threshold for quantized soft decisions in a near-optimum manner to a soft decision decoder. In one embodiment the means for setting the amplitude or threshold measures the soft decisions from a quantizer and marks data bits as weak or strong. The gain or threshold is automatically adjusted to achieve a desired fraction if each marking. The desired fraction is chosen as the value that optimizes performance of the soft decision decoder.

Abstract translation: 一种包含软判决纠错解码的数据通信接收机，以及用于将接近最优方式的量化软判决的幅度或阈值设置为软判决解码器的装置。 在一个实施例中，用于设置幅度或阈值的装置测量来自量化器的软判决，并将数据位标记为弱或强。 自动调整增益或阈值，以达到每个标记所需的分数。 选择期望的分数作为优化软判决解码器的性能的值。

公开(公告)号：US4772853A

公开(公告)日：1988-09-20

申请号：US84661

申请日：1987-08-12

Applicant: Billy D. Hart

Inventor： Billy D. Hart

IPC: H03B29/00 ,  H03D3/02 ,  H03D3/20 ,  H03D3/06 ,  H03K9/06

CPC classification number: H03D3/02 ,  H03D3/20 ,  H03B29/00 ,  H03D2200/0039

Abstract: Audio beat notes produced by sampling a square wave in a digital quadrature FM demodulator are reduced by adding filtered random noise, or dither, to the signal to be demodulated to randomly vary the width of successive pulses in the square wave. Filtration of the random noise prevents feedthrough of noise which would degrade the demodulated signal.

Abstract translation: 通过将数字正交FM解调器中的方波采样产生的音频节拍通过将滤波后的随机噪声或抖动添加到要解调的信号中以随机改变方波中连续脉冲的宽度来减少。 随机噪声的过滤可防止噪声的馈通，这将降低解调信号。