Digital loudspeaker drive method and device based on quaternary code dynamic mismatch reshaping
A digital speaker, mismatch shaping technology, applied in the direction of speaker distribution signal, sensor, electrical components, etc., can solve the problem of frequency response of speaker unit, small dynamic range of input signal, temperature rise, etc.
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Embodiment 1
[0115] In this embodiment, first, design the dynamic mismatch shaper according to the traditional two-state VFMS algorithm; then, according to Figure 11 As shown, the channel data is merged, and the encoding mapping is performed; finally, the mapping encoding state is used to control the switching of the MOSFET tube of the full-bridge drive network, thereby driving the transducer load to produce sound.
[0116] Assuming that the post-transducer load driven by the full-bridge drive network is an ideal ultra-wideband load unit, when the output state of the power tube is "0" or "1", the ideal transducer load can accurately radiate these states go out. Assuming that the frequency responses of the transducer loads on the 8 digital channels are exactly the same, under this assumption, the spectrum of the 8-channel synthetic signal based on the quaternary state code dynamic mismatch shaping method obtained by simulation is as follows: Figure 13 shown by the dotted line.
[0117] ...
Embodiment 2
[0120] In this embodiment, it is assumed that the post-stage transducer load driven by the full-bridge drive network is an ideal ultra-wideband load unit, and it is assumed that when the transducer load unit is in the state of radiating "0" or "1", there is a certain Amplitude error, its error distribution obeys a Gaussian distribution with a mean value of 0 and a variance of 0.01. According to this error distribution characteristic, there is a certain frequency response difference among the loads of the 8 channels.
[0121] When the traditional ternary state code VFMS algorithm based on "+1", "0" and "-1" is used for 8-channel mismatch shaping, the spectrum of the 8-channel composite signal is as follows Figure 14 As shown in the solid line of , while adopting the quaternary code VFMS algorithm based on "+1", "0H", "0L" and "-1" proposed by the present invention, the frequency spectrum of its 8-channel composite signal is as follows Figure 14 shown by the dotted line. Comp...
Embodiment 3
[0123] In this embodiment, the digital load unit adopts the full-band loudspeaker unit with a box produced by Swans to form an 8-element linear array, wherein the DC resistance of the loudspeaker unit is 15Ω, the distance between the array elements is 12cm, and the array length is 96cm; the microphone unit adopts Audio Precision The company's AP2722 audio analyzer has a built-in microphone, and the received signal of the microphone is collected and recorded by the AP2722 audio analyzer, and analyzed by FFT to obtain the received signal spectrum.
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