This disclosure provides methods and apparatuses related to a microphone. In an implementation, a microphone includes a laser self-mixing apparatus and a diaphragm apparatus, the diaphragm apparatus includes a membrane configured to respond to a sound vibration, and the laser self-mixing apparatus and the diaphragm apparatus are separately configured to detect a vibration of the membrane. In an example method performed by the microphone, a first voltage signal is obtained by using the laser self-mixing apparatus, and a second voltage signal is simultaneously obtained by using the diaphragm apparatus. If the first voltage signal is less than or equal to a preset threshold, the first voltage signal is converted into an audio signal; or if the first voltage signal is greater than the preset threshold, the second voltage signal is converted into an audio signal.