Invention Grant
- Patent Title: Telecoil hum filter
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Application No.: US15141247Application Date: 2016-04-28
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Publication No.: US09859990B2Publication Date: 2018-01-02
- Inventor: Stephen D. Julstrom
- Applicant: ETYMOTIC RESEARCH, INC.
- Applicant Address: US IL Elk Grove Village
- Assignee: ETYMOTIC RESEARCH, INC.
- Current Assignee: ETYMOTIC RESEARCH, INC.
- Current Assignee Address: US IL Elk Grove Village
- Agency: McAndrews, Held & Malloy, Ltd.
- Main IPC: H04B15/00
- IPC: H04B15/00 ; H04R3/04 ; H04R25/00

Abstract:
A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.
Public/Granted literature
- US20160323043A1 TELECOIL HUM FILTER Public/Granted day:2016-11-03
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