公开(公告)号：US3705264A

公开(公告)日：1972-12-05

申请号：US3705264D

申请日：1971-03-09

Applicant: IBM

Inventor： HARR JEROME DANFORTH

IPC: G08C15/12 ,  H03K23/24

CPC classification number: G08C15/12

Abstract: A digital data terminal operating from a two-wire transmission line is arranged for transmitting digital data on the same transmission line in the opposite direction. A number of electric switching elements which are opened or closed in accordance with digital data to be transmitted, are sensed with appropriate circuitry comprising a capacitor (or other electric state manifesting element) and circuit isolation diodes for each electric switching element and common initializing circuitry and sensing commutator circuitry. Preferably a shift register otherwise present for deserializing incoming data and timing wave generation is arranged for controlling the commutating function as incoming data is rippled through the shift register. Frequency division, amplitude division or time division multiplexing separates the signals on the transmission line for recognition at the terminals.

Abstract translation: 从双线传输线操作的数字数据终端被布置用于在相反的方向上在同一传输线上发送数字数据。 根据要传输的数字数据打开或关闭的多个电开关元件由包括电容器（或其他电状态显示元件）的适当电路和用于每个电开关元件和公共初始化电路的电路隔离二极管感测，以及 感应换向器电路。 优选地，用于反序列化输入数据和定时波生成的移位寄存器被布置用于当输入数据通过移位寄存器波纹时控制换向功能。 分频，幅分或时分复用将传输线上的信号分离，以便在终端处进行识别。

公开(公告)号：US3599151A

公开(公告)日：1971-08-10

申请号：US3599151D

申请日：1969-12-29

Applicant: IBM

Inventor： HARR JEROME DANFORTH

IPC: G06K7/00 ,  G06K9/38 ,  G06K9/00

CPC classification number: G06K9/38 ,  G06K2209/01

Abstract: The recognition of human and machine readable characters of a family of type of which each character has one or more narrow line segments on a contrasting background and is enhanced by a positive and negative peaked level photosensing arrangement. The sensing apparatus comprises an optoelectronic circuitry for interpreting optomechanical gated scanning of short straight line segments in seriatim. It produces an electric representation in response to the presence and absence of a character line segment in the image. A photosensitive element is arranged to receive light from an area on a document. The highest and lowest light values are translated in a reference level clamping circuit followed by positive and negative peak storage circuits. A threshold comparator circuit is individually coupled to the positive and negative peak storage circuits for delivering potential levels of two values indicating marks or spaces (the absence of marks). Preferably, threshold adjusting circuitry is interposed between one of the peak storage circuits and the threshold comparator circuit. Dynamic adjusting thresholding circuitry is included. Analog control circuitry is coupled to the storage and thresholding circuitry for timing and controlling the overall system by timing pulses conventionally obtained.

公开(公告)号：US3895237A

公开(公告)日：1975-07-15

申请号：US37636873

申请日：1973-07-05

Applicant: IBM

Inventor： HARR JEROME DANFORTH

IPC: G11B5/09 ,  G11B20/10 ,  H03K5/1532 ,  H03K5/20

CPC classification number: G11B20/10009 ,  H03K5/1532

Abstract: A peak detector generates a signal representing the occurrence of a peak in an input signal waveform each time the slope of the input signal waveform reverses and travels through a dead zone defined by the difference between two different reference voltages. The dead zone which prevents short term reversals in the input signal waveform due to noise and other aberrations from generating signals representing valid peaks and which is defined by the difference between the two reference voltages is easily adjusted such as by varying the value of a single resistor in one embodiment to adapt the peak detector circuit to different input signal waveform situations. A common terminal which is coupled to the two different reference voltages through opposite voltageresponsive devices has a voltage which varies directly in response to the input signal waveform as applied thereto by a voltage coupling device such as a capacitor. The voltageresponsive devices maintain the voltage of the common junction within the range defined by the two different reference voltages by conducting whenever the common junction voltage equals either of the reference voltages. Alternate conductions of the voltageresponsive devices are used to trigger a bistable device which provides an accurate representation of the peaks of the input signal waveform.

Abstract translation: 峰值检测器每当输入信号波形的斜率反转并行进通过两个不同参考电压之间的差定义的死区时，产生表示输入信号波形中峰值出现的信号。 防止由于产生表示有效峰值的信号产生的噪声和其他像差导致的输入信号波形的短期反转的死区，并且由两个参考电压之间的差定义的死区很容易调整，例如通过改变单个电阻器的值 在一个实施例中，使峰值检测器电路适应不同的输入信号波形情况。 通过相反的电压响应装置耦合到两个不同参考电压的公共端子具有响应于诸如电容器的电压耦合装置施加到其上的输入信号波形而直接变化的电压。 电压响应装置通过在公共结电压等于参考电压中的任一个时进行导通，将公共端的电压保持在由两个不同参考电压限定的范围内。 电压响应装置的交替导通用于触发提供输入信号波形的峰值的精确表示的双稳态装置。

公开(公告)号：US3631394A

公开(公告)日：1971-12-28

申请号：US3631394D

申请日：1969-12-29

Applicant: IBM

Inventor： HARR JEROME DANFORTH ,  JOHNSON REYNOLD BENJAMIN ,  MARRS RALPH EUGENE ,  NASSIMBENE ERNIE GEORGE ,  PRICE GEORGE EDMUND

IPC: G06K9/20 ,  G06K7/14

CPC classification number: G06K9/20 ,  G06K9/28

Abstract: The recognition of human- and machine-readable characters of a family of type of which each character has no more than 12 segments is enhanced by a dual-disk segmented scanning arrangement. The generic-type family format is a medianly quartered parallelogram (MQP) embracing both slanted and upright printing, the latter being more specifically in the format of an orthogonally quartered rectangle (OQR). The scanning apparatus comprises an opto-mechanical subassembly for precisely scanning the short straight line segments in seriatim. A pair of rotating disks are arranged in overlapping relationship with apertures at the point of scan moving in directions substantially normal to each other, and both disks are moving past the scanning point in a direction opposite to the direction of one of the disks. The disks are usually rotating at the same speed and in opposite directions, and the apertures are arranged for scanning a multiplicity of characters for each full rotation of the disks. The apertures are divided into slits and slots with a slit in one disk cooperating with a slot in the other disk moving in the direction of an image line segment under consideration. An opto1electronic arrangement produces an electric representation in response to the presence and absence of a character line segment in the image. The opto-electronic arrangement comprises a photosensitive diode arranged to receive light from an area on a document. The highest and lowest light values are translated in a positive and negative peak storage circuit coupled to the photosensitive element. A threshold comparator circuit is individually coupled to the positive and negative peak storage circuits for delivering potential levels of values indicating marks or spaces.

公开(公告)号：US3596111A

公开(公告)日：1971-07-27

申请号：US3596111D

申请日：1969-06-13

Applicant: IBM

Inventor： HARR JEROME DANFORTH

IPC: G05F1/56 ,  G06K15/10 ,  H01F7/18 ,  H03K17/72 ,  H03K17/735 ,  H03K17/06

CPC classification number: H03K17/735 ,  G06K15/10 ,  H03K17/72

Abstract: Varying unidirectional voltage energizing circuitry for electric devices, solenoids for example, to be energized selectively with maintained silicon controlled rectifiers (SCR) and the like is embodied with smaller, less expensive, lighter and more reliable than conventional filtered direct current circuit embodiments. Full (or half) wave rectified sine wave voltage is applied across a series connected solenoid and SCR device or a parallel arranged multiple of solenoids and SCR devices connected in series. Conventional electric gating pulses are applied to the gate electrodes of the SCR devices for initiating conduction in the conventional manner. Fall of energizing potential below the voltage level corresponding to minimum holding current is rendered ineffective to extinguish conduction by a transistor and series resistor maintaining a small current flow through the SCR device(s) until the value of energizing potential again rises above the voltage level of minimum holding current. The series resistor defines the maintaining holding current. Diodes are interposed between the combinations of series connected solenoid and SCR devices to isolate them one from another permitting energization of the solenoids at differing times and for differing time periods.