An electronic device mainboard comprising: a main body; an audio collecting component provided on the main body and configured to collect audio; a main controlling component provided on the main body, connected with the audio collecting component through a printed circuit printed on the main body and configured to receive and analyze the collected audio and then send out interaction instructions according to the collected audio; and an interaction component provided on the main body, connected with the main controlling component and configured to receive and execute the interaction instructions; wherein the audio collecting component comprises: a microphone component configured to collect analog signals of the audio; and a signal converter connected with the microphone component through the printed circuit printed on the main body and configured to receive and convert the collected analog signals of the audio to digital signals of the audio and send out the digital signals of the audio to the main controlling component through the printed circuit printed on the main body; characterised in that the main controlling component comprises an echo processing module adapted to perform echo cancellation for the received digital signals of the audio and in that an analog-to-digital converter is individually arranged on the main body, the analog-to-digital converter being configured to perform echo collection and send the collected echo to the echo processing module for echo cancellation. a main body; an audio collecting component provided on the main body and configured to collect audio; a main controlling component provided on the main body, connected with the audio collecting component through a printed circuit printed on the main body and configured to receive and analyze the collected audio and then send out interaction instructions according to the collected audio; and an interaction component provided on the main body, connected with the main controlling component and configured to receive and execute the interaction instructions; wherein the audio collecting component comprises: a microphone component configured to collect analog signals of the audio; and a signal converter connected with the microphone component through the printed circuit printed on the main body and configured to receive and convert the collected analog signals of the audio to digital signals of the audio and send out the digital signals of the audio to the main controlling component through the printed circuit printed on the main body; a microphone component configured to collect analog signals of the audio; and a signal converter connected with the microphone component through the printed circuit printed on the main body and configured to receive and convert the collected analog signals of the audio to digital signals of the audio and send out the digital signals of the audio to the main controlling component through the printed circuit printed on the main body; characterised in that the main controlling component comprises an echo processing module adapted to perform echo cancellation for the received digital signals of the audio and in that an analog-to-digital converter is individually arranged on the main body, the analog-to-digital converter being configured to perform echo collection and send the collected echo to the echo processing module for echo cancellation.