摘要:
A binary input signal S multiplied by a level-controlling modifier X.sub.n-1 is periodically sampled to determine its amplitude whose value is then differentially combined with a fixed reference value R to produce an error signal. The latter is multiplied by the same modifier X.sub.n-1 and by a fractional coefficient k to yield a corrective value which is then algebraically combined with modifier X.sub.n-1 to produce an updated modifier X.sub.n for the next sampling cycle. To avoid instability, the modified input signal may be subjected to a limitation of its dynamic range before or after sampling. A load to be driven by the input signals may receive the modified signal itself or the modifier used to control its level.
摘要:
An automatic teletypewriter is provided. The teletypewriter includes a keyboard having alpha and numeric characters and includes means to utilize the numeric character keys for dialing into the telex network. The teletypewriter also automatically keeps count of the characters generated on each line and generates a carriage return-line feed signal at the end of each line if not directed to do so.
摘要:
The teleprinter is provided with a bialphabetic keyboard, for example latin and arabic, and a dot printing head controlled by two different character generating units corresponding to the two alphabets. The teleprinter is normally predisposed for one of the two alphabets and can be switched to the other alphabet by means of a sequence of characters. The arabic character generating unit is adapted to recognize predetermined sequences for generating composite characters, i.e. the lam-alef group. Furthermore, some characters at the end of a word are generated by adding a tail to the normal character in response to the spacing code. The teleprinter can be connected to the conventional existing teleprinters, since neither the composite characters, nor the tails are transmitted on the line.
摘要:
A circuit for sensing reception of carrier in an information transmission system which employs valid detection of a carrier including filtering, comparison, and time delay, to determine propriety of a carrier, by a logic arrangement for digital interrogation including a pair of counters under the control of a third counter. Each of the pair of counters is advanced by signals derived from the detection circuitry over a predetermined time frame set by the third counter, and the counter outputs decoded to a deactivation device in the event of improper carrier detection. In addition, a resettable counter monitors the transmission during information flow. Failure to reset, indicating improper carrier, also triggers deactivation.
摘要:
Drivable type dies of a teleprinter are supported in intersecting rows and columns from a type carrier which is arranged for adjustment in intersecting paths at successive stations to which the carrier is moved for presenting any selected die in a position for character reproduction. Adjustment and movement of the carrier and translocation of an impeller to successive printing stations for driving successively selected dies between print and non-print modes results from magnetomotive phenomena generated by a linear electric motor.
摘要:
Apparatus for transforming standard polar or bipolar teletypelike signals as received from a telephone line into corresponding signals at different power levels for use with electronic equipment. In the apparatus, the received signals actuate and deactuate a tunnel diode oscillator. Oscillations thus produced are amplified, detected, integrated and thereafter processed to produce corresponding output signals at the desired power level.
摘要:
A teleprinter device utilizing a receiver formed from electronic circuits and constructed as a shift register, for use with an electromechanical printing mechanism, and employing a frequency generator which is adjustable to provide various operating speeds, the shift register having shift, start and reset circuits which are cooperable with a blocking circuit connected to said shift register to prevent further change, following entry of the last symbol step, in the shift register until release thereof in response to a control impulse, whereby the data is stored in the register, from the middle of the last symbol step, for a period of 1.25 step lengths.