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Inside this range of HSS sound beam, the audio can be heard by a human. The ultrasonic waves are highly directional and transmit like a flashlight. The signal from the UF power amplifier is emitted into the air by a transducer. Usually, piezoelectric polyvinylidene transducers are used as a transducer. Monolithic Film Transducers are used for the emission of HSS waves into the air. After the HF power amplification, the signal is fed to the monolithic film transducers, which transmit the HSS audio This is the final stage of HSS amplifier unit. In DSB system, the modulation index can be reduced to suppress all the distortions.Īn ultrasonic power amplifier is an HF Power amplifier that increases the power at the output stage. This unit also filters all other HF disturbances too. In this unit, the input digital audio is modulated with the high-frequency ultrasonic waves and produces an HF modulated wave. Usually ultrasonic crystal oscillators are used for making these oscillations and its frequency is above 40 KHz.ĭynamic DSB modulator performs the Ultrasound modulation with the audio signal. This is an ultrasonic oscillator circuit used for the generation of ultrasonic carrier waves for the modulation. Variable Carrier Frequency Oscillator (VCFO).After pre-amplification is completed, the pre-amplified audio is sent to the ultrasonic modulator This unit also controls equalization, other dynamic controls, etcĭigital audio pre-amp is used for the pre-amplification of the decoded audio from the audio signal processor. This section decodes almost all type of digital audios present. We can provide several types of inputs to this unit like single channel, multichannel audio up to 11.2 channels, and also all the DTS and DOLBY digital true audio formats, etc. This circuit detects and decodes all audio inputs and are filtered according to the requirement and sent to a digital pre-amp unit. Usually, 16 to 32-bit microcontrollers are used as the microcontroller.Īudio signal processing unit is an advanced audio circuit that consists of multichannel-Multi format High Definition Audio processor. This unit can perform all the audio adjustments.
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According to the power at the output, the supply voltage may vary from 12V to 60V. Normally multi-voltage power supplies are used as SMPS. This structure consists of multiple sections as explained belowĪs like all electronic equipment, The HSS system is also powered with a highly filtered SMPS. The architecture of an ultrasonic transducer is given above. We can’t get any disturbance from the ultrasonic sound (since it can’t be heard by the human ear), we can only hear the newly generated audio waves (that same as the input audio). This wave, when passing through the air, creates new sound waves within the range of human hearing (20Hz-20KHz). Here ultrasonic waves are used as modulated waves according to the input audio signal. Non-linearity is a property of air that creates new waves within another wave by the continuous expansion and contraction of waves. HSS technology works on the property of non-linearity. įor those who still don’t get what an HSS is it’s kind of like this ? This technology works with the help of modulated ultrasonic waves (above 40KHz) and these waves itself create audio frequency waves according to the input audio signal (This property of creating new audio waves within the ultrasonic wave is called non-linearity of air). By using this technology, we can create virtual real audio.
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The Hypersonic system produces highly directional audio without any disturbance for outside. This technology also provides ideal characteristics to almost all audio frequencies (normal loudspeakers is not ideal for all frequencies such as 20Hz to 20 KHz). The biggest advantage of this technology is that it does not include any complex electronic circuits having enclosures, crossovers, woofers, and midrange or tweeter elements as compared to a conventional loudspeaker system. This technology was developed by American Technology Corporation. It is considered one of the most innovative approaches to sound engineering. Hypersonic Sound (HSS) is one of the most revolutionary digital sound reproduction technologies of this century.