James B Couvillon

US Patent:

44661282, Aug 14, 1984

Filed:

Jan 15, 1981

Appl. No.:

6/225174

Inventors:

James B. Couvillon - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03J 710

US Classification:

455208

Abstract:

Disclosed is a pulsed FM receiver with automatic centering of the intermediate frequency at the true center of the input filter passband. The frequency standard of the frequency discriminator which controls the local oscillator frequency is adjusted to produce zero discriminator output during the period between signal pulses. The discriminator frequency standard remains automatically aligned with the center of the input filter passband and the input bandwidth may then be reduced for optimum receiver sensitivity.

US Patent:

39538052, Apr 27, 1976

Filed:

Nov 7, 1974

Appl. No.:

5/521721

Inventors:

James Benedict Couvillon - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 112

US Classification:

328162

Abstract:

Disclosed is a zero center frequency IF system having an all digital complex multiplier in which DC components in the IF signals are removed from an A/D converter output. Any DC level which reaches the input of the A/D converter or any misalignment in the A/D converter causes the digital outputs to contain unequal numbers of positive and negative words. The sign bit of the digital output is coupled to the input of an integrator which generates a DC output proportional to the DC offset in the A/D converter output. The integrator output is substracted from the IF signal coupled to the input of the A/D converter and cancels any DC components present.

US Patent:

39697258, Jul 13, 1976

Filed:

Jun 12, 1974

Appl. No.:

5/478651

Inventors:

James Benedict Couvillon - Dallas TX
William Dorsey Daniels - Richardson TX
Ronald Lee Gassner - Richardson TX
Robert Allen Maher - Richardson TX

Assignee:

The United States of America as represented by the Secretary of
Transportation - Washington DC

International Classification:

G01S 956

US Classification:

343 65R

Abstract:

Disclosed is improved distance measuring equipment comprising an airborne FM coded, chirp, interrogator transmitter in combination with a weighted matched receiver in a ground transponder. The airborne transmitter produces a long low power frequency modulated output pulse. Detection in the transponder receiver is accomplished by pulse compression matched filter techniques.

US Patent:

39538494, Apr 27, 1976

Filed:

Aug 6, 1974

Appl. No.:

5/495163

Inventors:

James B. Couvillon - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01S 902

US Classification:

343 7A

Abstract:

Disclosed is a magnetron powered selectable pulsewidth radar system having minimum receiver bandwidth for each pulsewidth and automatic centering of the intermediate frequency at the true center of the input filter pass band. A frequency discriminator adjusts the local oscillator frequency after each transmitted pulse to cause the intermediate frequency on the return of that pulse to equal an internal adjustable frequency reference. The filtered IF noise signal between received pulses is compared to the internal reference by the frequency discriminator and its output is used to adjust the reference to equal the center frequency of the actual receiver input pass band.