Guzik Technical Enterprises

Other

Gennady Mangeym

Nahum E Guzik

James W Jones

Tony K Yung

A method for data window centering a multifrequency data separator (12) based on having the frequency of a voltage-controlled oscillator (20) at least twice that of read data window frequency, and setting delay of a delay line (14) used in the data separating process so that arriving raw data pulses will be more accurately assigned to their corresponding windows. The method is realized by providing the multifrequency data separator with a phase comparator emulator (30) and a counter (28). According to another embodiment, the apparatus comprises a counter (28b) combined with a delay setting logic unit (40). The method and apparatus described above result in window centering which does not essentially depend on timing characteristics of circuitry used in the construction of the data separator.

Method and apparatus for data window centering ina multifrequency data

A motor speed control system comprises an encoder (12) which produces a series of indicator pulses related to the motor's speed. The period of the pulse is compared with that of a crystal-controlled reference period produced by a period generator (14). Comparison is made by means of a period comparator (16) consisting of logic elements, including flip-flops (F1, F2, F3) and gates (G1 and G2). Digital outputs of the period comparator control UP and DOWN charge pumps whose integrated value controls the motor through a power driver. Advantages of the system are precise digital control with crystal accuracy.

Motor speed control system

A motor speed control circuit produces indexing pulses during each revolution of the motor. Each indexing pulse triggers the production of a predetermined pattern of timing pulses. The timing pulses are integrated. The result of the integration is a relatively constant level signal that controls the motor current. At the end of a predetermined pattern of pulses in the binary signal, the integrator input signal goes to one of two binary states and causes the integrator output voltage to ramp up or down, as the case may be, until another indexing pulse is received from the motor. The output of the integrator upon receipt of the indexing pulse controls the speed of the motor while another set of binary pulses are being integrated.

Growing community of inventors

San Jose, CA, United States of America

Gennady Mangeym