DAVID THOMAS STARKEY
Pilots at Avenida Manana, La Jolla, CA
License number
California A2821980
Issued Date
Sep 2016
Expiration Date
Sep 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
6423 Avenida Manana, La Jolla, CA 92037
Professional information
Audio Signal Generator To Emulate Three-Dimensional Audio Signals
US Patent:
6178245, Jan 23, 2001
Filed:
Apr 12, 2000
Appl. No.:
9/548077
Inventors:
David Thomas Starkey - La Jolla CA
Anthony Martin Sarain - La Jolla CA
Anthony Martin Sarain - La Jolla CA
Assignee:
National Semiconductor Corporation - Santa Clara CA
International Classification:
H04R 500, H04R 502
US Classification:
381 17
Abstract:
A system produces, based on samples of a single-channel input audio signal and an indication of a particular orientation of the listener relative to a source of the audio signal, a multi-channel output audio signal that emulates an audio signal as emanating from the source having the particular orientation to the listener. Interaural time delay (ITD) circuitry generates, from the single-channel input audio signal, a first left channel audio signal and a first right channel audio signal, wherein the first left channel audio signal and the first right channel audio signal are each based on the single-channel input audio signal but differ from each other at least with respect to phase based on the indication of the particular orientation. Azimuth frequency compensating (AFC) circuitry modifies the first left channel audio signal and the first right channel audio signal based on an azimuth, relative to the listener's left ear and right ear, respectively, of the particular orientation. High frequency cuing (HFC) circuitry intensifies high frequencies of the first left channel audio signal and the first right channel audio signal based on whether the source is on axis with an ear canal of the listener's left ear and right ear, respectively.
Reflective Piano Keyboard Scanner
US Patent:
7843575, Nov 30, 2010
Filed:
Jan 4, 2008
Appl. No.:
11/969628
Inventors:
David T. Starkey - La Jolla CA, US
Assignee:
Midi9 LLC - La Jolla CA
International Classification:
G01B 11/14
US Classification:
356614
Abstract:
A scanner for a keyboard device having a reflective surface for each key has a sensor associated with each key that includes an LED and a photo-transistor. The LED is turned ON for a first measurement, followed by a second measurement with the LED turned off, and a subtraction of the second measurement from the first yields an illumination value for a key x. The LEDs and associated photo-transistors are sequentially enabled in groups of n, thereby eliminating optical interference. Each key x has associated correction parameters of LinRest(x) associated with illumination value with the key in the rest (up) position, LinDown(x) associated with illumination value with the key in the down position, TrebErr(x) associated with the reflectivity effect of one adjacent key(x+1), and BassErr(x) associated with the reflectivity effect of another adjacent key(x−1). By reading a single illumination value in combination with these correction parameters, the key position may be accurately extracted and the effect of ambient light and surrounding key interference removed.
Reflective Piano Keyboard Scanner
US Patent:
8013234, Sep 6, 2011
Filed:
Sep 23, 2010
Appl. No.:
12/889403
Inventors:
David T. Starkey - La Jolla CA, US
Assignee:
Midi9 LLC - La Jolla CA
International Classification:
G10H 1/00
US Classification:
84724, 700108
Abstract:
A scanner for a keyboard device having a reflective surface for each key has a sensor associated with each key that includes an LED and a photo-transistor. The LED is turned ON for a first measurement, followed by a second measurement with the LED turned off, and a subtraction of the second measurement from the first yields an illumination value for a key x. The LEDs and associated photo-transistors are sequentially enabled in groups of n, thereby eliminating optical interference. Each key x has associated correction parameters of LinRest(x) associated with illumination value with the key in the rest (up) position, LinDown(x) associated with illumination value with the key in the down position, TrebErr(x) associated with the reflectivity effect of one adjacent key(x+), and BassErr(x) associated with the reflectivity effect of another adjacent key(x−). By reading a single illumination value in combination with these correction parameters, the key position may be accurately extracted and the effect of ambient light and surrounding key interference removed.
Reflective Piano Keyboard Scanner
US Patent:
8159683, Apr 17, 2012
Filed:
Sep 24, 2010
Appl. No.:
12/889926
Inventors:
David T. Starkey - La Jolla CA, US
Assignee:
Midi9 LLC - La Jolla CA
International Classification:
G01B 11/14
US Classification:
356614
Abstract:
A scanner for a keyboard device having a reflective surface for each key has a sensor associated with each key that includes an LED and a photo-transistor. The LED is turned ON for a first measurement, followed by a second measurement with the LED turned off, and a subtraction of the second measurement from the first yields an illumination value for a key x. The LEDs and associated photo-transistors are sequentially enabled in groups of n, thereby eliminating optical interference. Each key x has associated correction parameters of LinRest(x) associated with illumination value with the key in the rest (up) position, LinDown(x) associated with illumination value with the key in the down position, TrebErr(x) associated with the reflectivity effect of one adjacent key(x+1), and BassErr(x) associated with the reflectivity effect of another adjacent key(x−1). By reading a single illumination value in combination with these correction parameters, the key position may be accurately extracted and the effect of ambient light and surrounding key interference removed.