Sound generating apparatus and electronic device

A sound generating apparatus, comprising a housing, a transducer, a first valve, and a control circuit, wherein

• the housing has an inner cavity and an opening, the inner cavity of the housing and external space of the housing communicate through the opening of the housing;
• the transducer is installed in the inner cavity of the housing to divide the inner cavity of the housing into a front cavity and a back cavity, the front cavity is located between the back cavity and the opening;
• the first valve is fastened to the housing and covers the opening of the housing;
• the control circuit is electrically connected to the transducer and the first valve, the control circuit is configured to generate a first control signal and a second control signal, the first control signal is configured to drive a vibration member of the transducer to vibrate, the second control signal is configured to control a switch on/off state of the first valve such that the sound generating apparatus emits a plurality of air pulses to form audible sound having a frequency lower than a vibration frequency of the vibration member of the transducer, wherein the plurality of air pulses comprise a positive pulse and a negative pulse, and a sound pressure level of the audible sound varies with proportions of the positive pulse and the negative pulse, or a quantity of positive pulses or a quantity of negative pulses.