Light powered hearing aid
AssigneeZounds Hearing, Inc.
InventorsSamuel L. Thomasson, Fan Wu
Life of this patent
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Abstract
A hearing aid includes a case and a photovoltaic cell located in the case near a translucent portion of the case. A detector circuit includes a voltage comparator for monitoring the voltage from the photocell and indicating variations in voltage. The variations are analyzed to detect data for operating the hearing aid.
Claims13
A hearing aid comprising in combination:
- a) a case containing electronics for processing audio signals,
- b) a battery for powering the electronics,
- c) a photovoltaic cell responsive to light for generating an electrical voltage,
- d) a charging circuit coupled to the photovoltaic cell for charging the battery,
- e) a voltage comparator having an input coupled to the photovoltaic cell and being responsive to the electrical voltage generated thereby, the voltage comparator including an output for providing a first output signal when the electrical voltage generated by the photovoltaic cell is greater than a reference voltage, and for providing a second output signal when the electrical voltage generated by the photovoltaic cell is less than said reference voltage, and
- f) a timer coupled to the output of the voltage comparator, said timer detecting changes at the output of the voltage comparator between the first output signal and the second output signal having a duration of approximately 0.2 seconds or longer resulting from variations in the intensity of light incident upon said photovoltaic cell,
- g) wherein said electronics for processing audio signals is responsive to the timer for controlling the manner in which such audio signals are processed.
A hearing aid comprising in combination:
- a) a case containing electronics for processing audio signals,
- b) a battery for powering the electronics,
- c) a photovoltaic cell responsive to light for generating an electrical voltage, and
- d) a charging circuit coupled to the photovoltaic cell for charging the battery,
- e) a voltage comparator having an input coupled to the photovoltaic cell and being responsive to the electrical voltage generated thereby, the voltage comparator including an output for producing a pulse width modulated signal when the intensity of light incident upon the photovoltaic cell crosses a threshold magnitude,
- f) a timer coupled to the output of the voltage comparator, said timer detecting data received as variations in the intensity of light incident upon said photovoltaic cell,
- g) wherein said pulse width modulated signal has a frequency below approximately 5 Hz.
A method of controlling a hearing aid, the hearing aid including a case containing electronics for processing audio signals, a battery for powering the electronics, first and second photovoltaic cells each responsive to light for generating an electrical voltage, a charging circuit coupled to at least one of the first and second photovoltaic cells for charging the battery, and a control circuit for selecting from among a plurality of audio signal processing modes, the method comprising the steps of:
- a) monitoring the intensity of light incident upon the first photovoltaic cell;
- b) monitoring the intensity of light incident upon the second photovoltaic cell;
- c) detecting that the light incident upon the first photovoltaic cell has been reduced to a low intensity for a predetermined duration of approximately two seconds or more, while the light incident upon the second photovoltaic cell remains at a significantly higher intensity over the same duration, and generating a mode selection signal in response to such detection;
- and
- d) causing the control circuit to change a currently selected audio signal processing mode in response to the generation of the mode selection signal in step c).
Dependencies are inferred from the claim text.