This was included in the Pixel 4 and allows the user to control their phone without touching it. It identifies obstacles and uses vibration to identify location and proximity Google’s Soli project uses radar to create a touchless gesture recognition system. The Sunu band includes a sonar sensor on the wrist, this works in conjunction with a white cane and maps the 3 dimensional space as the person walks. iGlasses, released in 2012 were sunglasses with a centrally mounted sensor that alerted the wearer to low-hanging branches and other eye-level obstacles.In still another embodiment, the control signal acts upon a constant amplitude instead of the audio input signal in order to provide a speech-responsive tactile vibration for the deaf. component representing the continuous noise, and then detecting and filtering again. Alternatively, the control signal can be derived by envelope-detecting the audio signal, filtering the detected signal to remove its d.c. Speech components appearing in the amplifier output signal are then envelope-detected and filtered to provide the control signal. An envelope detector is biased to provide a zero output amplitude in response to the quiescent amplifier output level. The control signal may be derived from an AGC circuit having a slow attack, fast decay characteristic to establish a quiescent output level from the AGC amplifier in the absence of speech. See: Electronic Curbcuts: Universal Access for everyone: 1982: Noise-Canceling Microphone History: A circuit for suppressing background noise of a continuous nature while enhancing speech signals, or signals having the transient temporal qualities of speech, includes a signal multiplier which, in the preferred embodiment, receives the composite audio signal along with a control signal present only when the speech component of the audio signal is present. He built it for his blind friend Countess Carolina Fantoni da Fivizzono.
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