A sound producing device, characterized by, comprising: at least one air pulse generating element (100, 200, 300 or 400), each of the at least one air pulse generating element (100, 200, 300 or 400) comprising: a membrane; a first air chamber, wherein a chamber pressure exists in the first air chamber; and at least one opening; wherein the membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the plurality of air pulses are propagated through the at least one opening, the plurality of air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device; wherein each of the plurality of air pulses has a pulse cycle, each of the pulse cycles has a pulse-generating time segment and a pulse-isolating time segment in sequence, a driving signal (DRS, DRS', DRS", Sp, Sq or Su) is applied to actuating the membrane in one of the pulse cycles, and the driving signal (DRS, DRS', DRS", Sp, Sq or Su) during the pulse-generating time segment is different from the driving signal (DRS, DRS', DRS", Sp, Sq or Su) during the pulse-isolating time segment; wherein the pulse-generating time segment comprises a rising period (Tr) and a maintaining period (Tm), and the pulse-isolating time segment comprises a falling period (Tf) and an isolation period (Ti); wherein in the first air chamber, a first pressure change occurs within the rising period (Tr), a second pressure change occurs within the falling period (Tf), and a third pressure change occurs within the maintaining period (Tm); wherein absolute values of the first pressure change and the second pressure change are greater than an absolute value of the third pressure change; wherein the first pressure change and the second pressure change are produced by chamber compression and chamber expansion, the chamber compression and the chamber expansion are caused by a chamber volume change within the rising period (Tr) and a chamber volume change within the falling period (Tf), and the chamber volume changes are caused by membrane movement due to the driving signal (DRS, DRS', DRS", Sp, Sq or Su) within the rising period (Tr) and the falling period (Tf); wherein the driving signal (DRS, DRS', DRS", Sp, Sq or Su) remains constant within the isolation period (Ti), and the chamber pressure within the first air chamber achieves balance with the ambient pressure by or before an end of the pulse-isolating time segment or the isolation period (Ti). a membrane; a first air chamber, wherein a chamber pressure exists in the first air chamber; and at least one opening; wherein the membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the plurality of air pulses are propagated through the at least one opening, the plurality of air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device; wherein each of the plurality of air pulses has a pulse cycle, each of the pulse cycles has a pulse-generating time segment and a pulse-isolating time segment in sequence, a driving signal (DRS, DRS', DRS", Sp, Sq or Su) is applied to actuating the membrane in one of the pulse cycles, and the driving signal (DRS, DRS', DRS", Sp, Sq or Su) during the pulse-generating time segment is different from the driving signal (DRS, DRS', DRS", Sp, Sq or Su) during the pulse-isolating time segment; wherein the pulse-generating time segment comprises a rising period (Tr) and a maintaining period (Tm), and the pulse-isolating time segment comprises a falling period (Tf) and an isolation period (Ti); wherein in the first air chamber, a first pressure change occurs within the rising period (Tr), a second pressure change occurs within the falling period (Tf), and a third pressure change occurs within the maintaining period (Tm); wherein absolute values of the first pressure change and the second pressure change are greater than an absolute value of the third pressure change; wherein the first pressure change and the second pressure change are produced by chamber compression and chamber expansion, the chamber compression and the chamber expansion are caused by a chamber volume change within the rising period (Tr) and a chamber volume change within the falling period (Tf), and the chamber volume changes are caused by membrane movement due to the driving signal (DRS, DRS', DRS", Sp, Sq or Su) within the rising period (Tr) and the falling period (Tf); wherein the driving signal (DRS, DRS', DRS", Sp, Sq or Su) remains constant within the isolation period (Ti), and the chamber pressure within the first air chamber achieves balance with the ambient pressure by or before an end of the pulse-isolating time segment or the isolation period (Ti).