Abstract: A circuit for controlling a speed and a phase of a VCR servo system includes a Control (CTL) signal generation section, a speed error detection section, a phase error detection section and a speed/phase control section. The phase error detection section has a recording phase error detector and a playback phase error detector. A CTL signal blank discrimination section inputs a CTL pulse from the playback phase error detector, discriminates a blank interval of a CTL signal based on the inputted CTL pulse, and outputs discrimination signal in accordance with the discriminated result. A first switching control section inputs the discrimination signal, an FF/REW mode signal, a recording mode signal and a tape type discriminating signal and performs a logical operation based on the inputted signals to output a first control signal.

Abstract: A rotation control apparatus employing a comb filter to cut off a specified frequency and multiples thereof in response to speed error data detected from a rotation detector. A phase error detector detects a phase error between the rotation detector and an external vertical synchronization pulse. A differentiator converts the output of the filter into angular acceleration error data. The output of the phase error detector is integrated. The two values are scaled and converted to an analog signal which is utilized to drive a motor.

Abstract: A motor rotation controlling device, usable for example in a video recorder, to minimize transient phenomena at an initial operation and shorten a transient response time for detecting a rotation speed of a motor, a signal processor for constantly controlling rotation speed of the motor by the detected rotation speed supplied from the rotation detector, a comb-shaped filter for removing a rotation period component and its harmonic component included in a control signal supplied from the signal processor, a controller for varying a transfer function of the comb-shaped filter at a transient response time and a normal time according to the rotation speed of the motor, a driving device for driving a motor by the filtered control signal supplied from the comb-shaped filter, and a limit device connected between the signal processing means and the comb-shaped filter for clamping the control signal.

Abstract: In a VCR including a timer microprocessor for counting capstan frequency signals or reel pulses from a VCR mechanism and a system control unit for communicating with the timer microprocessor and supplying predetermined signals to the VCR mechanism and a servo system, a method for executing predetermined assembly programs adapted to assembly edit several recorded programs according to the order desired and inserting titles in respective recorded programs. In order to carry out title inserting for respective recorded programs during execution of predetermined assembly programs, a memory is provided which is adapted to store data corresponding to the assembly programs and titles of recorded programs, in accordance with the control of timer microprocessor.

Abstract: A quantizing error removing circuit for a rotational control device applied to a servo circuit and the like of a video cassette recorder, designed to removing the quantizing error generated upon controlling the speed and phase, minimizing a change of gain characteristic of a control device, thereby improving its efficiency.