Alfred J Cann from Brookfield, NH, age 98

Resumes

Retired

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Location:

Sanbornville, NH

Industry:

Electrical/Electronic Manufacturing

Publications

Us Patents

Coherent Frequency Memory

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US Patent:

39710211, Jul 20, 1976

Filed:

Apr 14, 1975

Appl. No.:

5/567973

Inventors:

Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - South Nashua NH

International Classification:

G01S 738

US Classification:

343 18E

Abstract:

A single configuration-invariant hybrid phasing circuit is utilized for both phase detection and phase shifting in a quasi-coherent memory to produce an essentially constant amplitude CW signal which is later gated to produce constant amplitude false range pulses. In one mode of operation the subject circuit acts as a phase detector to sense the phase difference between a portion of the received signal and the recirculated signal. In the other mode of operation the subject circuit acts as a phase shifter to phase shift the recirculated signal such that this phase difference is less than 45. degree. This effectively adjusts the loop delay for the wavelength of the incoming signal. Thus, the subject circuit adjusts the phase of the signals in a recirculation loop of the quasi-coherent memory such that no portion of the CW signal formed during the recirculation is out of phase with any other portion by more than 45. degree. , to thereby limit amplitude variations in the transmitted pulse level with frequency.

Modified A. M. Detector

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US Patent:

41045947, Aug 1, 1978

Filed:

Sep 1, 1976

Appl. No.:

5/719560

Inventors:

Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

H04B 112
H03D 104

US Classification:

325475

Abstract:

Reduction of interference from off-frequency signals in an a. m. receiver is achieved by substituting an average detector for the conventional peak detector employed in such receivers. Conversely, enhancement of off-frequency signal reception is achieved by employing an average detector in parallel with a peak detector with their outputs subtracted.

Digitally Controlled Electronic Function Generator

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US Patent:

45831882, Apr 15, 1986

Filed:

Mar 11, 1983

Appl. No.:

6/474938

Inventors:

Alfred J. Cann - Wilton NH
Bruce A. Ricker - Penacook NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

G06J 100

US Classification:

364608

Abstract:

A new method and apparatus for generating an analog output signal as a function of a digital input in the form of digital words over a specified range. The range is divided into a plurality of intervals, and the function is approximated by a linear segment in each interval. Each linear segment is defined by a step value, which is the value of the linear segment at the beginning the interval, and a slope value, which is the slope of the linear segment in the interval. The function is then approximated for any desired digital word in the range by determining the step and slope values for the interval into which the digital input signal falls, determining an incremental value by multiplying the slope value by the difference between the digital input signal and the value of the digital input signal at the beginning of the interval, and adding the incremental value to the step value.

Pulse Width To Voltage Converter Circuit

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US Patent:

45859604, Apr 29, 1986

Filed:

Oct 11, 1984

Appl. No.:

6/659808

Inventors:

Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

G06G 712
H03K 508

US Classification:

307490

Abstract:

A low-loss, low-cost passive pulse width to voltage converter is provided by utilizing a diode clamp having a resistor in series therewith to provide a soft clamp or integrating clamp.

Satellite Communications System Incorporating Ground Relay Station Through Which Messages Between Terminal Stations Are Routed

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US Patent:

41351568, Jan 16, 1979

Filed:

Jun 20, 1974

Appl. No.:

5/481015

Inventors:

Royden C. Sanders - Wilton NH
Martin R. Richmond - Lexington MA
Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

H04B 720

US Classification:

325 4

Abstract:

A satellite relay communications system includes a ground relay station arranged so that each message from one subscriber to another is relayed by the satellite relay to the ground relay, processed by the ground relay and then transmitted to the second subscriber by way of the satellite relay. Processing at the ground relay station includes a switching function in which the carrier frequency of each message is changed from the frequency used for transmitting by the subscriber sending each message to the frequency used for reception by the subscriber to whom the message is addressed. This permits each subscriber to use a single transmitting frequency and a minimum number of receiving frequencies.

Attenuator

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US Patent:

41491238, Apr 10, 1979

Filed:

Jun 30, 1978

Appl. No.:

5/920928

Inventors:

Martin R. Richmond - Lexington MA
Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

H03K 902
H03K 508

US Classification:

328168

Abstract:

Attenuation of a signal is achieved by biphase modulating the signal with an asymmetrical duty factor rectangular wave. In one embodiment of the invention an input signal is applied to a phase reversal switch having as its second input thereto an asymmetrical duty factor rectangular wave.

Multiple Source Jamming Signal Cancellation System

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US Patent:

61008389, Aug 8, 2000

Filed:

Jun 16, 1975

Appl. No.:

5/589490

Inventors:

Martin R. Richmond - Lexington MA
Alfred J. Cann - Wilton NH

Assignee:

Lockheed Martin Corporation - Nashua NH

International Classification:

G01S 736

US Classification:

342 17

Abstract:

Suppression of jamming from multiple sources is achieved by detecting the AM difference frequency produced by the beating of a desired signal and the smaller of the multiple jamming signal with the stronger jamming signal and applying same to one input of a single-sideband modulator while simultaneously applying the received signal (containing both the desired signal and the jamming signals) to the other input to the single-sideband modulator whereby the larger jamming signal is suppressed. The sum and difference outputs of the single-sideband modulator containing the upper and lower sidebands, respectively, of the desired signal plus the smaller jamming signal are each processed by a jamming cancellation circuit to suppress the smaller jamming signal and their outputs combined to receive the desired signal.

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