Hearing aid
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United States of America Patent
Stats
-
Mar 2, 1999
Grant Date -
N/A
app pub date -
May 9, 1997
filing date -
Nov 26, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hearing aid includes a microphone (1), a signal-transmission unit (2, 3,) for forming or otherwise processing the signal, an output amplifier (4) to which an earphone (10) is connected, and a battery as the power supply. The output amplifier (4) is implemented essentially as a .SIGMA.-.DELTA. amplifier and is connected to a pulse generator (8) which produces a high-frequency pulsed clock signal in the 1 MHz region. A series-connected low-pass filter (15) is also provided. The input signal to the signal converter is a representation, produced by signal processing in the transmission unit, of the low-frequency input signal to the hearing aid, this signal being converted in the signal converter into a binary signal. The output signal (14) thus appears, after passing through the low-pass filter, essentially as an amplified copy of the low-frequency input signal.
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Family
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Cited Art Landscape
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