Television singing system, circuit board and television

The utility model relates to the field of singing systems, and discloses a television singing system, a circuit board and a television, the television singing system comprises an audio receiving unit, a decoder, a microphone processing unit and a sound output unit which are electrically connected in sequence; the audio receiving unit is used for receiving a first microphone audio signal and transmitting the received first microphone audio signal to the decoder; the decoder is used for decoding the first microphone audio signal to obtain a second microphone audio signal and transmitting the second microphone audio signal to the microphone processing unit; and the microphone processing unit is used for processing the second microphone audio signal to obtain a third audio signal and outputting the third audio signal to the sound output unit for playing. Therefore, the microphone audio signal input by the user has low time delay, the microphone audio signal does not need to be processed by a sound processing syst