Display synchronization signal generation apparatus in the digital receiver

The present invention is a display synchronization signal generation device that enables a stable display output irrespective of the change of the transmission rate of the digital broadcast signal received by the digital broadcast receiving system. Device according to the invention, the speed difference detection unit includes a vertical period variation detector, the vertical synchronizing signal generator, a pixel clock generator, and generating a horizontal synchronizing signal portion. Speed ​​difference detector detects the difference between the decoding rate of the transmission rate and the broadcast signal of the broadcast signal received. Vertical period variation detector detects the variation of the vertical period of the screen to be output on the basis of the speed difference detected by the speed difference detection unit. Generating a vertical synchronizing signal portion and generates a vertical synchronization signal of the display to be output to the vertical synchronizing signal period fluctuates in accordance with the detected variation in the vertical period variation detector. Pixel clock generating unit generates the pixel clock based on the predetermined basis clock. Horizontal synchronizing signal generating unit generates a horizontal synchronizing signal of the display to be output on the basis of the pixel clock generated by the pixel clock generator.