Method and device for detecting compact disc blank area and data record area

The invention provides a device for detecting compact disc blank area and data record area. The gain controller of the device adjusts the received radio frequency signal into an amplified radio frequency signal with preset amplitude according to an amplitude feedback signal; an amplitude detector receives the amplified radio frequency signal and generates the amplitude feedback signal, and the amplitude feedback signal is output to the gain controller, and the amplitude of an upper envelope curve signal is output according the upper envelope line signal of the amplified radio frequency signal with preset amplitude; and an amplitude comparator compares the amplitude of the received upper envelope curve signal with threshold and generates a comparison result signal, and whether the position is located in blank area or data record data is judged according to the comparison result signal. The invention also provides a method for detecting compact disc blank area and data record area. By adopting the method and de