Notes on "Digital" technology in
J ustAMP Digital Amplifier

JustAMP Digital Amplifier is designed for someone with a whisper voice. In addition to solving battery life issues, it solves a couple of sound quality issues with amplifying a whisper voice which JustAMP solves with it’s Digital technology:

1) Clarity: The engineers at JustMed, Inc. have developed a digital process for recognizing air noise and reducing or eliminating it on the amplifier. This is achieved with software specifically written for the computer within JustAMP. This allows the user to place the microphone very close to the mouth. Whisper voices associated with Parkinson’s, Multiple Sclerosis, and ALS are clearly amplified. No "crackling" noise is present from the air rush going across the microphone as with a whisper voice.

2) Feedback: Another issue with amplifying a whisper voice is feedback (that loud squeal one may hear when the microphone and speaker are too close to each other). To amplify a whisper voice, one needs to turn the amplifier up very loud. Other amplifiers on the market will get feedback if turned up too loud and the user will be forced to separate the microphone they speak into and the speaker box from which their voice is heard by many feet. Using our DSP software written for JustAMP, we do not allow this to happen. This allows for the JustAMP to still remain close to where the user's voice is used to being heard (i.e., it can be worn around the neck via a lanyard or worn in a shirt pocket). These features are very different than amplifiers currently on the market. Other amplifiers achieve volume only with speakers; JustAMP achieves volume with speakers and our software and allows for a more rich, full, sound
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Competitive amplifiers are digital in only one sense: They use the term Digital to describe their system which uses a Class D Amplifier. They are talking about an Integrated Circuit (IC) on their Printed Circuit Board (PCB) which takes a small electrical signal and amplifies it into the speaker. Traditional amplifiers would remain on all the time. The key feature about a Class D Amplifier is that they are smart. If they determine if a signal is coming. Then they turn on. Conversely, if they determine a signal is off they go to sleep. They are on off but they use much less current/power. This function of the Class D Amplifier does not change the quality, clarity, or amount of amplification (i.e. they do not have better sound, but they are more efficient).

JustAMP is all digital. It uses a high powered Processor (Digital Signal Processor – DSP). This is how we are able to design in the features mentioned above. The comparison is analogous to a calculator and a Personal Computer. They are both digital, but one is much more powerful and advanced than the other.