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1. 发明授权

US4432026A Apparatus and method for determining read head position 失效
标题翻译：用于确定读取头位置的装置和方法
公开(公告)号：US4432026A
公开(公告)日：1984-02-14
申请号：US291344
申请日：1981-08-10
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： G05D3/12 , G11B5/58 , G11B5/588 , G11B15/467 , G11B21/10 , G11B5/00
CPC分类号： G11B15/467 , G11B5/58 , G11B5/588
摘要： A system is described for determining the position of a magnetic read head relative to the center of a selected data track on a magnetic recording medium moving with respect to the read head. Tracking signals of equal frequency, but out of phase a predetermined fixed amount, are recorded on adjacent data tracks. The tracking signal frequency is selected to be a long enough wavelength such that a single read head positioned over a selected data track also detects the tracking signal recorded on adjacent data tracks. A phase comparator compares the phase of the tracking signal detected by the read head with respect to the phase of a reference signal of equal frequency, and a resultant signal is generated which is indicative of any deviation of the read head from the center of the selected track.
摘要翻译：描述了一种用于确定磁读头相对于相对于读头移动的磁记录介质上所选数据轨道的中心的位置的系统。相邻数据轨道上记录相同频率但异相预定固定量的跟踪信号。跟踪信号频率被选择为足够长的波长，使得位于所选择的数据轨道上的单个读取头还检测记录在相邻数据轨道上的跟踪信号。相位比较器将读头读出的跟踪信号的相位相对于相等频率的参考信号的相位进行比较，并产生一个结果信号，该信号表示读头与选定的中心点的任何偏差跟踪。

2. 发明授权

US4480271A Dropped sample data rate reduction system 失效
标题翻译：丢弃样本数据速率降低系统
公开(公告)号：US4480271A
公开(公告)日：1984-10-30
申请号：US316978
申请日：1981-11-02
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： G11B20/18 , H04N9/804 , H04N9/808 , H04N11/04 , H04N9/49
CPC分类号： H04N9/8081 , H04N11/042 , H04N9/808
摘要： A method and apparatus are disclosed for eliminating or dropping digital samples from a data stream of samples to reduce the data rate for transmission of the data stream through a transmission channel, such as a data record and reproduce system or the like, and for subsequently reconstructing the original data stream by using the unaltered and recovered digital samples to generate an interpolated value for each of the samples that has been dropped. A finite impulse response multi-term digital filter is used to generate the interpolated value for the samples that have been dropped. Advantages reside in the fact that errors are not propagated during multiple generation recording or transmission, since unaltered sample values are always used to produce the interpolated value for the dropped sample that is being reconstructed. The invention has particular use in video recording and reproducing wherein it is desirable to record a digital data stream at the lowest practicable data rate.
摘要翻译：公开了一种从样本的数据流中消除或丢弃数字样本的方法和装置，以减少用于通过传输信道（例如数据记录和再现系统等）传输数据流的数据速率，并随后重构原始数据流，通过使用未更改和恢复的数字样本来为已经丢弃的每个样本生成内插值。有限脉冲响应多项数字滤波器用于产生已经丢弃的样本的内插值。优点在于，在多代记录或传输期间不传播错误，因为始终使用未改变的采样值来产生被重建的丢弃样本的内插值。本发明在视频记录和再现中具有特别的用途，其中期望以最低可行数据速率记录数字数据流。

3. 再颁专利

USRE28823E Switching sequence detector for PAL color television 失效
标题翻译： PAL彩色电视切换序列检测器
公开(公告)号：USRE28823E
公开(公告)日：1976-05-18
申请号：US173705
申请日：1971-08-20
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： H04N9/465 , H04N9/89
CPC分类号： H04N9/89 , H04N9/465
摘要： A time-base correcting system primarily adapted for use in video tape recording equipment and providing synchronous lockup and time base corrected operation of the video-tape recorder in the playback mode. The system includes circuitry receiving phase alternating line (PAL) composite television signals and which determines the burst switching sequence of the recorded signal before stable lockup is achieved.

4. 发明授权

US4480274A Record verify and optimize system 失效
标题翻译：记录验证和优化系统
公开(公告)号：US4480274A
公开(公告)日：1984-10-30
申请号：US485159
申请日：1983-04-15
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： G11B5/008 , G11B5/02 , G11B5/035 , G11B27/36 , G11B15/02
CPC分类号： G11B5/02 , G11B27/36 , G11B5/0086 , G11B5/035
摘要： A method and apparatus are disclosed for enabling the continuous monitoring of recording circuit performance and the automatic optimization of the recording process in a rotary head recorder having a plurality of recording heads. A calibration signal is recorded by each recording head onto the overlap area of a moving magnetic tape medium. A fixed monitor head subsequently detects components of the recorded signal, the magnitudes of which are squared and retained in sample and hold units. The sampled and held values are periodically used to construct an outputted value commensurate with recording circuit performance. Optimization is accomplished by varying the recording drive level of a recording head about a predetermined point during a series of successive overlap periods. A DC error voltage is derived from the respective outputs resulting from such variation, and used to shift the recording drive level of that head towards a point of optimum playback output.
摘要翻译：公开了一种用于能够连续监视记录电路性能和在具有多个记录头的旋转磁头记录器中对记录过程进行自动优化的方法和装置。校准信号由每个记录头记录到移动的磁带介质的重叠区域上。固定监视器头随后检测记录信号的分量，其大小被平方并保留在采样和保持单元中。采样和保持值周期性地用于构造与记录电路性能相称的输出值。通过在一系列连续重叠期间改变记录头围绕预定点的记录驱动电平来实现优化。从这种变化产生的相应输出导出直流误差电压，并用于将该磁头的记录驱动电平移向最佳重放输出点。

5. 发明授权

US4468708A Combined data rate reduction system 失效
标题翻译：组合数据速率降低系统
公开(公告)号：US4468708A
公开(公告)日：1984-08-28
申请号：US316756
申请日：1981-10-30
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： H04N7/32 , H04B14/06 , H04N9/804 , H04N9/808 , H04N9/49
CPC分类号： H04N9/8081 , H04N9/8082 , H04N9/8042
摘要： A method and apparatus are disclosed for performing a reduction of the data rate of a data stream for transmission through a transmission channel or recording and for subsequently reconstructing the original data stream upon receipt or during reproducing. The method and apparatus utilizes a combination of two processes, one of which eliminates or drops digital samples from the data stream to reduce the data rate for transmission and which subsequently reconstructs the original data stream using the unaltered and recovered digital samples to generate an interpolated value for each of the samples that had been dropped. The second process utilizes differential pulse code modulation for reducing the number of data bits per sample before sending the data stream through the transmission channel and for subsequently restoring the data to its original multi-bit form.
摘要翻译：公开了一种方法和装置，用于执行用于通过传输信道或记录传输的数据流的数据速率的降低，并且用于随后在接收或在再现期间重建原始数据流。该方法和装置利用两个过程的组合，其中之一消除或丢弃数据流中的数字样本，以减少用于传输的数据速率，并随后使用未改变和恢复的数字样本重构原始数据流，以产生内插值对于已经掉落的每个样品。第二个过程利用差分脉冲编码调制，在通过传输通道发送数据流之前减少每个样本的数据位数，并随后将数据恢复到原来的多位形式。

6. 发明授权

US4399474A Automatic threshold tracking system 失效
标题翻译：自动阈值跟踪系统
公开(公告)号：US4399474A
公开(公告)日：1983-08-16
申请号：US292657
申请日：1981-08-10
申请人： Charles H. Coleman, Jr.
发明人： Charles H. Coleman, Jr.
IPC分类号： H04L25/497 , G11B5/09 , G11B20/10 , G11B20/14 , G11B5/02
CPC分类号： G11B20/1492 , G11B20/10009
摘要： A magnetic recorder including a playback circuit for decoding a ternary waveform digital data signal is disclosed, wherein positive and negative threshold levels, used to distinguish between signal levels representative of data ones from signal levels representative of data zeros, are automatically adjusted to compensate for occasional reductions in overall signal level that can occur due to dropouts and modulation noise on the magnetic medium. Two sample and hold units are used to generate an output signal whose amplitude reflects only those signal levels that are greater than some minimum absolute value. This output signal is filtered and then used to generate the compensated positive and negative threshold levels.
摘要翻译：公开了一种包括用于对三进制波形数字数据信号进行解码的重放电路的磁记录器，其中用于区分表示数据1的信号电平与表示数据零点的信号电平的信号电平之间的正和负阈值电平被自动调整以补偿偶尔由于磁介质上的脱落和调制噪声可能导致的整体信号电平的降低。两个采样和保持单元用于产生一个输出信号，其幅度仅反映那些大于一些最小绝对值的信号电平。该输出信号被滤波，然后用于产生补偿的正和负阈值电平。

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