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Additional Advantages over Conventional Speakers
Damping: Conventional speakers oscillate long after the input signal is stopped. The heavy membrane transfers only a fraction of its energy into the air and it continues to oscillate for a considerable time before the oscillations decays. Conventional speaker systems utilize artificial damping to overcome this problem. The most common damping mechanism leverages the amplifier to absorb large opposite currents induced in the voice coil of the speaker due to its movement. The excess currents require sophisticated amplifier designs. In contrast, an Audio Pixels speaker "stops on a dime". The signal is initiated and terminated within one clock cycle.Vibrations: Due to the high impedance matching of Audio Pixels speakers, a much smaller movement is required to generate the same loudness. According to Newton's law, each action generates an opposite reaction. In a speaker, movement of the membrane generates opposite movement of the frame. The smaller movement of an Audio Pixels speaker generates significantly lower vibration levels. Vibrations are often problematic in sensitive electronics. In displays for example, excess vibrations produced by speakers can cause deformation of the image and potentially damage the display elements. Vibrations are also problematic in full duplex communication devices (such as mobile phones or blue-tooth headsets), where the microphone can pick up the speaker vibrations generating echo and feedback noise. The reduced vibrations of an Audio Pixels speaker allow much more moderate levels of echo reduction and suppression.
Directivity Control: Audio Pixels invented (and patented) a scheme of controlling the acoustic directivity pattern of its speakers. The scheme is similar in nature to other phase-array devices, most well known are radars and RF antennas. The same speaker can be used as an omni-directional sound source (much like conventional speakers), or a unidirectional source (a narrow beam of sound is projected in one directions, and almost no sound is projected in any other direction),or a multi-directional source projecting several sound beams (each may carry different audio), in several different directions. The applications leveraging control of sound directionality are limitless.
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