Method and system for driving thermoacoustic device with digital real-time audio signal

Abstract

The invention discloses a method and a system for driving a thermoacoustic device by using a digital real-time audio signal. In the method, the analog audio signal before the thermoacoustic device is converted and filtered to reduce noise; The analog audio signal is converted into a 10-16-bit high-precision digital signal stream by oversampling; after digital filtering of the obtained digital signal stream, a digital audio signal stream that can change with the clock signal is obtained through two-stage digital modulation of the signal ; Shaping and power amplifying the modulated digitized audio signal stream to obtain a digitized audio signal stream for driving the thermoacoustic device to play audio. The system includes an input module, an analog-to-digital conversion module, a modulation module, an output module and a power management module. The invention realizes the real-time digital conversion of the audio signal and drives the thermoacoustic device, effectively eliminates the frequency doubling effect of the thermoacoustic device, and significantly reduces the power consumption of the device when the device emits sound.

Description

technical field [0001] The invention belongs to the field of audio drive, especially the technical field of thermoacoustic device drive, and specifically relates to a method and system for driving a thermoacoustic device with a digital real-time audio signal, using a signal input module, an analog-to-digital conversion module, a modulation module and an output The modules work together to form a complete signal processing chain, which digitizes the input audio signal in real time and realizes real-time, high-fidelity, low-power-consumption driving thermoacoustic devices. Background technique [0002] At present, in the field of acoustics and the industry, mainstream audio playback speakers use moving coils, moving irons or piezoelectric methods. For example, the current mainstream moving coils are based on the principle of generating a magnetic field through a frequency-converted audio signal and interacting with the magnetic field of a permanent magnet. , to push the coil o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of frequency doubling effect generated when the existing thermoacoustic device is driven based on the "DC + AC" mode, and to realize real-time driving of the thermoacoustic device to play audio signals. The present invention provides a digital The method and system for driving a thermoacoustic device with a real-time audio signal can effectively eliminate the inherent frequency doubling effect of the thermoacoustic device, and can drive the thermoacoustic device to play audio signals in real time

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