James Leigh Harrison
Engineers at Caine St, Campus, NM
License number
Colorado 4333
Issued Date
Dec 17, 1960
Renew Date
Mar 18, 1994
Expiration Date
Mar 18, 1994
Type
Professional Engineer
Address
Address
800 Caine St, Campus, NM 87801
Professional information
Phonetic Equalizer System
US Patent:
5233665, Aug 3, 1993
Filed:
Dec 17, 1991
Appl. No.:
7/808685
Inventors:
Gary L. Vaughn - Albuquerque NM
James L. Harrison - Socorro NM
James L. Harrison - Socorro NM
International Classification:
H03G 500
US Classification:
381 97
Abstract:
An audio equalizer system includes a filter having a passband extending substantially continuously across the audio spectrum, with the filter having an input terminal and an output terminal. An input network is adapted to apply an input audio signal to the input terminal of the filter, and an output network is adapted to provide an output audio signal representative of the signal at the output terminal of the filter. The group delay of the filter varies continuously with frequency across the audio spectrum, with that group delay being relatively high but less than approximately 10 milliseconds at frequencies less than approximately 200 Hz and being relatively low but greater than or equal to zero at frequencies greater than approximately 8000 Hz. When configured as a hearing assistance system, an input audio transducer, or microphone, generates the audio input signal from an incident acoustic wave, and an output audio transducer, or speaker, produces an output acoustic wave from the output audio signal.