| 摘要 |
A photofliudic audio receiver for producing sound directly from light modulated at audio frequencies and amplifying the sound to deliver uniform frequency response over a wide audio frequency range, utilizing only fluidic and thermal devices. It includes a photoacoustic cell for converting the modulated light signal to an acoustic signal, and at least one laminar proportional amplifier (LPA) for amplifying the acoustic signal to provide the sound output of the receiver. Each LPA has a rising frequency response over the wide audio frequency range, to thus offset the inherent falling frequency response of the photoacoustic cell. The receiver may have several amplifying stages, each stage including several LPA's connected in parallel. The receiver may also include acoustic highpass filters connected in series with the LPA inputs or outputs to accentuate the rising frequency response of the LPA's. The sound output of the receiver can be fed to acoustic terminating devices such as headphones or an exponential horn.
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