| 摘要 |
<p>An improved analog-to-digital converter device suitable for use in digital hearing aids, and methods for operating such a device are disclosed. Aspects of the present invention may provide a full 16-18 bits (96-108 dB) of dynamic range in a digital hearing aid circuit using 14-bit analog-to-digital converters typically available for hearing aid use. An embodiment of the present invention may use two analog-to-digital converters (315, 317) that are clocked by the same sampling trigger. One of the converters may be preceded by an amplifier (303) having, for example, 24 dB of gain, while the other converter may be preceded by an amplifier (305) having 0 dB of gain. The output of the first converter or the output of the second converter may be used, or a combination of the two outputs may be used to produce audio for the hearing aid user, depending upon input signal level.</p> |
