David Eugene Carlson

US Patent:

41129270, Sep 12, 1978

Filed:

Apr 6, 1977

Appl. No.:

5/785174

Inventors:

David L. Carlson - Ames IA

Assignee:

Renco Corporation - Minneapolis MN

International Classification:

A61B 1000

US Classification:

128 2V

Abstract:

A pulsed ultrasonic detection system particularly adapted for detection of biological tissue includes a probe for placement against the body, apparatus for transmitting ultrasonic energy into the body and for receiving return pulses, signal processing circuits and a cathode ray tube display for displaying the return pulses as a function of time. A gating signal is generated after a predetermined time delay from each transmitted pulse, and the time delay and the duration of the gating signal are selected to correspond to the timing of a particular expected return pulse. Return pulses are gated into an audible signal device by a switching device, but only during the time interval thus defined by the gating signal. If a return pulse of sufficient amplitude occurs during the gated interval, the audible signal device is energized.

US Patent:

43590560, Nov 16, 1982

Filed:

Jan 8, 1981

Appl. No.:

6/223481

Inventors:

David L. Carlson - Ames IA

Assignee:

Renco Corporation - Minneapolis MN

International Classification:

A61B 1000

US Classification:

128660

Abstract:

An automatic digital backfat meter. An apparatus and method primarily for measuring the thickness of backfat in an animal which automatically adjusts sensitivity and notifies the user when a proper reading is obtained. The transducer (62) produces pulses which pass amplifier (64), threshold detector (68), and are counted in counter (74). If two counts are received, indicator (76) is activated. If two counts are not received, the cycle is repeated and the amplifier (64) has its gain increased by sensitivity control (66) in a stepwise increment until the first fat layer is detected. Time delay (78) prevents the first echo from being counted at counter (74).

US Patent:

42426553, Dec 30, 1980

Filed:

Dec 15, 1978

Appl. No.:

5/969781

Inventors:

David J. Carlson - Indianapolis IN
John P. Yu - Indianapolis IN

Assignee:

RCA Corporation - New York NY

International Classification:

H01R 1710

US Classification:

333183

Abstract:

A coaxial RF connector adapted for mounting on a wall of a utilization device, such as a video disc player, employs a capacitor for providing DC and low frequency blocking between the wall of the device and the outer conductor of the connector. The capacitor is formed in the shape of a washer to provide a uniformly distributed capacitance around the outer conductor.

US Patent:

46672435, May 19, 1987

Filed:

Oct 31, 1985

Appl. No.:

6/793197

Inventors:

Harold Blatter - Indianapolis IN
David J. Carlson - Indianapolis IN

Assignee:

RCA Corporation - Princeton NJ

International Classification:

H04N 550
H04N 718
H04B 126

US Classification:

3581911

Abstract:

A television (TV) receiving system includes a first TV receiver for receiving TV signals in a first range of frequencies, such as are used for cable, VHF and UHF broadcasting including a frequency synthesizer type local oscillator. The frequency synthesizer uses a voltage controlled oscillator (VCO) controlled by a tuning voltage responsive to a first frequency feedback signal. The receiver includes a coupling arrangement for adapting the receiving system for use with an external plug-in unit including a second TV receiver for receiving TV signals in a second range of frequencies, such as are used for direct broadcast satellite (DBS) signals. The second TV receiver provides a second frequency feedback signal. The receiving system includes a multiplexer for selectively coupling one of the first and second frequency feedback signals to the frequency synthesizer for controlling the VCO.

US Patent:

47900300, Dec 6, 1988

Filed:

Nov 25, 1986

Appl. No.:

6/934887

Inventors:

David J. Carlson - Indianapolis IN
William L. Lehmann - Indianapolis IN

Assignee:

RCA Licensing Corporation - Princeton NJ

International Classification:

H04B 118
H03J 106

US Classification:

455193

Abstract:

Antenna coupling components including a coil and a static discharge resistor are mounted on a separate printed circuit board within a tuner that is positioned by means of projecting tabs on each end so as to self-center the coil with the inductor. A first tab extends through an aperture in the tuner wall and carries foil patterns for connecting an antenna to the coil and one end of the resistor. The other tab is secured to a slot in an internal shield to provide mechanical support for the board, electrical connection to ground for the other end of the resistor and which facilitates lateral movement of the coil during assembly. A connector block, fixed to the outside of the tuner enclosure, provides mechanical support and electrical insulation for the first tab and additionally provides electrical connection to a pair of antenna terminals and a right angle bend in the antenna circuit.

US Patent:

45816433, Apr 8, 1986

Filed:

Jul 25, 1983

Appl. No.:

6/516933

Inventors:

David J. Carlson - Indianapolis IN

Assignee:

RCA Corporation - Princeton NJ

International Classification:

H04N 550
H04B 126

US Classification:

3581911

Abstract:

In a double conversion tuner for a television receiver including a first local oscillator and a first mixer for converting the RF signal corresponding to a selected channel to a first IF signal and a second local oscillator and a second mixer for converting the first IF signal to a second IF signal, control apparatus is coupled to one of the local oscillators for offsetting its frequency and correspondingly the carriers of the first IF signal relative to the passband of a first IF filter coupled between the two mixers. In this manner the amplitude or phase of the carriers of the first IF signal can be controlled. An AFT signal is coupled to the other one of the local oscillators to compensate for the frequency offset of the carriers of the first IF signal in order to tune the carriers of the second IF signal to their nominal frequencies.

US Patent:

43685404, Jan 11, 1983

Filed:

Jun 5, 1981

Appl. No.:

6/271742

Inventors:

David J. Carlson - Indianapolis IN
William L. Lehmann - Indianapolis IN

Assignee:

RCA Corporation - New York NY

International Classification:

H03L 718
H04B 126

US Classification:

455180

Abstract:

In a phase locked loop tuning system including a prescaler for dividing the frequency of the local oscillator signal by a factor selected to make the resultant frequency divided signal compatible with digital processing portions of the tuning system, a frequency selective network is coupled to the prescaler to tune the self-oscillation frequency of the prescaler to a frequency not corresponding to the local oscillator frequency of any legitimate channel. In this manner, when a new channel is selected and the amplitude of the local oscillator signal is below the threshold at which the prescaler will respond to it, the phase locked loop will properly control the local oscillator, rather than respond to a self-oscillation signal which may otherwise correspond to the local oscillator frequency for the selected channel.

US Patent:

43521118, Sep 28, 1982

Filed:

Jan 26, 1981

Appl. No.:

6/228587

Inventors:

David J. Carlson - Indianapolis IN
Sander H. C. Tsou - Indianapolis IN

Assignee:

RCA Corporation - New York NY

International Classification:

H01Q 1906

US Classification:

343860

Abstract:

An antenna coupling network for supplying VHF television carriers to a VHF tuner of a television receiver and weather band carriers to a tuner of a weatherband radio incorporated in the television receiver from a single monopole antenna without adverse interaction simply comprises a first wire connected between the monopole antenna and the VHF tuner and a second wire wrapped around the first wire a predetermined number of times and connected at one end to tuner of the weatherband radio. The number of turns are selected to form a series resonance at a midpoint of the weather band. Desirably the other end of the second wire is left unconnected.