Conference terminal and feedback suppression method

A conference terminal, comprising:

• a microphone array for receiving a sound;
• a speaker for playing the sound;
• a communication transceiver for transmitting or receiving data;
• and
• a processor coupled to the microphone array, the speaker and the communication transceiver, and is configured to:
• divide a transmitted sound signal into sub sound signals of a plurality of frequency bands, wherein the transmitted sound signal is transmitted via a network through the communication transceiver, and the different sub sound signals correspond to the plurality of different frequency bands;
• detect an interfered frequency band corresponding to a howling interference according to the sub sound signals of the plurality of frequency bands, wherein a power of the sub sound signal of the interfered frequency band among the plurality of frequency bands increases along with time, and the interfered frequency band is affected by the howling interference, and the processor is further configured to:
• determine the interfered frequency band according to a power change and a single frequency ratio, wherein the power change is related to a difference in a power of the sub sound signal of the interfered frequency band at different time points, and the single frequency ratio is a proportion that the power of the sub sound signal of the interfered frequency band accounts for in the sub sound signals;
• determine an interference direction according to a plurality of input sound signals received by the microphone array and merely pass through the interfered frequency band, wherein a sound from the interference direction leads to the howling interference;
• and
• determine a beam pattern of the microphone array according to the interference direction, wherein a gain of the beam pattern in the interference direction is reduced.