Video display apparatus and method for synchronising a clock signal with the horizontal frequency of an input signal

An apparatus for controlling a horizontal oscillation in a multiscan video display apparatus is provided with horizontal oscillator circuitry for generating a horizontal oscillation, an input terminal for receiving input video signals having a plurality of horizontal synchronization signals of different frequencies, a memory for storing a plurality of preset frequency control data corresponding to each of the plurality of horizontal synchronization signals of different frequencies, detecting circuitry for detecting a frequency of one of the plurality of horizontal synchronization signals, and supplying circuitry for supplying one of the plurality of preset frequency control data corresponding to the frequency detected by the detecting circuitry to the horizontal oscillator circuitry, thereby generating said horizontal oscillation. Also, a method for controlling a frequency of a horizontal oscillator in a multiscan display apparatus having as input video signals having a plurality of horizontal synchronization signals of different frequencies is provided including the steps of, storing a plurality of preset frequency control data corresponding to each of the plurality of horizontal synchronization signals of different frequencies, detecting a change in frequency of said horizontal synchronization signal, and supplying the preset frequency control data corresponding to the changed frequency to the horizontal oscillator, thereby controlling the frequency of the horizontal oscillator.