Patent ID: 8325949

Claim:
A thermoacoustic device, comprising: a sound wave generator, wherein the sound wave generator comprises a carbon nanotube structure comprising a plurality of successively oriented carbon nanotube segments joined end-to-end by van der Waals attractive force therebetween, and each carbon nanotube segment comprises a plurality of carbon nanotubes parallel to each other and combined by van der Waals attractive force therebetween; and an amplifier circuit, the amplifier circuit comprising: a peak hold circuit, the peak hold circuit is configured to accept an audio signal and output a peak hold signal; an add-subtract circuit, the add-subtract circuit is configured to accept the audio signal and the peak hold signal and output a modulated signal after a comparison operation of the audio signal and the peak hold signal; and a power amplifier, the power amplifier is configured to accept the modulated signal, amplify the modulated signal, and output an amplified voltage signal to drive the sound wave generator.