A sound producing apparatus, comprising: a driving circuit, configured to generate a plurality of cell driving voltages according to an audio input signal, comprising; a sampling module, receiving the audio input signal, configured to obtain a plurality of samples of the audio input signal at a plurality of sampling time instants (t 0 -t n); and a summing module, being coupled to the sampling module and configured to perform a summing operation according to the plurality of samples to generate a driving voltage (V D) at time t n by executing V D ( t n) = V D (t 0) + ∑ n i=1 ΔV D (t i) = V D (t i) = V D (t 0) + k∑ n i=1 S(t i), wherein S(t i) denotes a sample among the plurality of samples, wherein the summing module performs the summing operation directly on the plurality of samples to generate the driving voltage (V D); a converting module, coupled to the summing module, configured to generate the plurality of cell driving voltages according to the driving voltage (V D); wherein the plurality of cell driving voltages is applied to a plurality of cell electrodes (C21, C23); and a sound producing device, comprising a plurality of cells, and the plurality of cells comprises a plurality of cell membranes, a plurality of cell membrane actuators and the plurality of cell electrodes (C21, C23) attached to the plurality of cell membranes; wherein the plurality of cell electrodes (C21, C23) drive the plurality of cell membranes to reach a specific position according to the plurality of cell driving voltages, such that the sound producing device produces a plurality of air pulses at an air pulse rate, the air pulse rate is higher than a maximum human audible frequency; wherein the plurality of air pulses produces a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a zero sound pressure level. a driving circuit, configured to generate a plurality of cell driving voltages according to an audio input signal, comprising; a sampling module, receiving the audio input signal, configured to obtain a plurality of samples of the audio input signal at a plurality of sampling time instants (t 0 -t n); and a summing module, being coupled to the sampling module and configured to perform a summing operation according to the plurality of samples to generate a driving voltage (V D) at time t n by executing V D ( t n) = V D (t 0) + ∑ n i=1 ΔV D (t i) = V D (t i) = V D (t 0) + k∑ n i=1 S(t i), wherein S(t i) denotes a sample among the plurality of samples, wherein the summing module performs the summing operation directly on the plurality of samples to generate the driving voltage (V D); a converting module, coupled to the summing module, configured to generate the plurality of cell driving voltages according to the driving voltage (V D); wherein the plurality of cell driving voltages is applied to a plurality of cell electrodes (C21, C23); and a sound producing device, comprising a plurality of cells, and the plurality of cells comprises a plurality of cell membranes, a plurality of cell membrane actuators and the plurality of cell electrodes (C21, C23) attached to the plurality of cell membranes; wherein the plurality of cell electrodes (C21, C23) drive the plurality of cell membranes to reach a specific position according to the plurality of cell driving voltages, such that the sound producing device produces a plurality of air pulses at an air pulse rate, the air pulse rate is higher than a maximum human audible frequency; wherein the plurality of air pulses produces a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a zero sound pressure level.