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1.发明授权System for generating initial settings for an automatic transversal equalizer 失效用于生成自动横向均衡器的初始设置的系统公开(公告)号：US3629736A
公开(公告)日：1971-12-21
申请号：US3629736D
申请日：1970-10-02
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD , MEADORS HOWARD CLARENCE JR
CPC classification number: H04L25/03038
Abstract: In a transversal equalizer with tap multipliers whose settings are automatically controlled by the mean-square error difference between a predetermined transmitted work pattern and a receivergenerated identical pattern, an improvement in startup performance in the presence of high-level distortion is achieved by making incremental phase changes in the receiver timing on each failure of comparison between the two patterns. Further improvement is effected by resetting all tap multipliers, except a reference multiplier, to the zero condition when such comparison failures persist. Upon repeated failure for a predetermined number of occurrences the state of the receiver word generator is altered to conform to the most recently received segment of the transmitted work pattern thus attaining timing synchronization and initial equalizer adjustment simultaneously.
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2.发明授权Timing recovery system in which an equalizer{40 s sampling time is set in response to the difference between the actual mean square error and a predetermined acceptable error 失效定时恢复系统，其平均值（40秒采样时间是针对实际平均误差与预测的可接受错误之间的差异设定的）
公开(公告)号：US3617635A
公开(公告)日：1971-11-02
申请号：US3617635D
申请日：1970-05-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD , MEADORS HOWARD CLARENCE JR
CPC classification number: H04L7/0062 , H04L25/03038
Abstract: A system is disclosed in which an error signal used for adjusting tap weights in a time domain equalizer is integrated in an up-down counter over one-half of an interval. At the end of the first one-half of the interval, the count in the counter is decreased by a predetermined amount proportional to a minimum acceptable error level. The count in the counter is then reduced at a predetermined rate until the count in the counter is zero. During the time the count is being reduced at the predetermined rate, the sampling time of a signal applied to the equalizer is phase shifted in a direction determined by the difference between the integrated error in the present and preceding intervals.
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3.发明授权Digital equalizer in which tap adjusting signals are derived by modifying the signal code format 失效通过修改信号代码格式导出的TAP调整信号中的数字均衡器
公开(公告)号：US3633014A
公开(公告)日：1972-01-04
申请号：US3633014D
申请日：1970-03-13
Applicant: BELL TELEPHONE LABOR INC
Inventor： LEMP JOHN JR , MEADORS HOWARD CLARENCE JR
CPC classification number: H04L25/03038
Abstract: An all digital multitap transversal filter equalizer system is disclosed in which a received data signal is sampled at a predetermined rate. Each sample of the data signal is converted into a 10-bit serial digital word. The 10-bit word is multiplied by a second digital word successively at each tap to provide data for composite output data words. It has been found that by converting the composite output data word into one''s complement format, error magnitude and error polarity signals can be derived for adaptive adjustment without additional equipment.
Abstract translation: 公开了一种全数字多位跨横向滤波均衡器系统，其中以预定速率对接收的数据信号进行采样。 数据信号的每个样本被转换成10位串行数字字。 10位字在每个抽头处连续地乘以第二数字字以提供复合输出数据字的数据。 已经发现，通过将复合输出数据字转换为补码格式，可以导出误差幅度和误差极性信号用于自适应调整而无需附加设备。
