Signal processing circuit and signal processing method

The invention discloses a signal processing circuit and a signal processing method. The signal processing circuit comprises an interface unit, a power conversion unit, a time sequence control unit and a signal conversion processing unit, wherein the interface unit is configured to be connected to a power supply in order to filter a power signal; the power conversion unit is configured to be connected to the interface unit in order to convert the filtered power signal so as to generate a secondary power supply; the time sequence control unit is configured to be connected to the power conversion unit in order to perform power time sequence control on output time of the secondary power supply; and the signal conversion processing unit is configured to be connected to the time sequence control unit in order to receive the secondary power supply, output an image display signal after the image display signal is decoded and optimized in sequence, and output a gamma ray curve matched with a display terminal at the same time. Through adoption of the signal processing circuit and the signal processing method, the problem of narrow working temperature range in the prior art is solved, and a processing capability specific to complex low-quality signals can be realized.