公开(公告)号：US3605019A

公开(公告)日：1971-09-14

申请号：US3605019D

申请日：1969-01-15

Applicant: IBM

Inventor： CUTTER JOSEPH T ,  DAVIES JOHN M ,  FREEMAN DON G ,  SCHWARZ GORDON R ,  VANBLERKOM RICHARD

IPC: H04B7/04 ,  H04B15/00

CPC classification number: H04B7/04

Abstract: The invention is a communication system which causes errors introduced by selective frequency fading channels to be time localized. It does this by transmitting the Fourier transform of the baseband signal. The preferred embodiment consists of a frequency division multiplexor multiplexing a plurality of channels and a Fourier transformer taking the Fourier transform of the digital representation of the resultant waveform. The Fourier transform is reconverted into an analog representation by a D-A converter and transmitted by means of an A-D converter. The receiver reconverts the analog representation of the Fourier transform into a digital signal, a Fourier transformer takes the inverse transform, as a D-A converter, reconverts the digital representation back into an analog waveform and then an FDM demodulator demultiplexes the analog waveform resulting in a signal representative of the input to the transmitter with errors introduced by the channels appearing as burst errors (time localized).

公开(公告)号：US3591784A

公开(公告)日：1971-07-06

申请号：US3591784D

申请日：1968-10-17

Applicant: IBM

Inventor： CUTTER JOSEPH T ,  FREEMAN DON G ,  BLERKOM RICHARD VAN

IPC: G06F17/14 ,  G06F7/38

CPC classification number: G06F17/142

Abstract: A real time digital Fourier analyzer utilizing either the Cooley-Tukey or the Danielson-Lanczos algorithms consisting of particularly adapted hardware to facilitate the calculations of said algorithms. Specifically, the preferred embodiment utilizes hardware equally adapted to both algorithms with fixed point arithmetic, a look-ahead two''s complementor, and an address generator employing three binary counters.

公开(公告)号：US3910527A

公开(公告)日：1975-10-07

申请号：US44957774

申请日：1974-03-08

Applicant: IBM

Inventor： BUHLER OTTO R ,  CUTTER JOSEPH T ,  MANTEY JOHN P ,  WOOD DAVID R

IPC: G03B21/43 ,  G11B15/32 ,  B65H59/38 ,  G03B1/04

CPC classification number: G11B15/32 ,  G03B21/43

Abstract: The parameters, i.e., acceleration/deceleration, speed, position and tension, of a length of unbuffered magnetic recording tape, which runs between the two reels of a reel-to-reel tape transport, are accurately controlled by a closed-loop servomechanism which is controlled as a function of the tape distribution between the two reels. A number of design-point servo networks are constructed and arranged to energize the reel motors, based upon the assumption that given tape distributions exist. The outputs of these point servo networks are weighted or blended by a network which is controlled in accordance with actual tape distribution. The output of the weighting network is then used to control reel motor energization.

Abstract translation: 通过一个闭环伺服机构精确地控制在卷轴到卷轴带传输的两个卷轴之间运行的无缓冲磁记录带长度的加速/减速，速度，位置和张力的参数， 作为两个卷轴之间的带分布的函数被控制。 基于存在给定的磁带分布的假设，构造并布置了许多设计点伺服网络以对卷轴电机通电。 这些点伺服网络的输出由根据实际磁带分布控制的网络进行加权或混合。 然后，加权网络的输出用于控制卷轴电机通电。

公开(公告)号：US3601592A

公开(公告)日：1971-08-24

申请号：US3601592D

申请日：1970-04-15

Applicant: IBM

Inventor： CUTTER JOSEPH T ,  ELDER WALTER H ,  FREEMAN DON G ,  BLERKOM RICHARD VAN

IPC: G06F17/14 ,  G06F7/00 ,  G06F7/38

CPC classification number: G06F17/142

Abstract: A fast Fourier transform addressing system using the DanielsonLanczos algorithm. The addressing system uses a basic relationship between addresses to allow implementation of the addressing system using a reduced number of address counters and reduced storage requirements for system constants.