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Primary Examiner: Robinson, Thomas A.
Assistant Examiner:
Attorney: Sharp; Melvin, Donaldson; Richard L., Hiller; William E.

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Title: AM/FM time division surface wave device transmitter

Abstract: A device for sample modulating electronic information signals which includes mixing circuitry having a first input coupled to receive information signals, a second input for receiving electrical sampling signals, and an output for generating thereon electrical output signals proportional to the product of the information signals and the sampling signals. Also included is an acoustic surface wave device having an impulse response of predetermined shape and finite length. The surface wave device has an output coupled to the second input of the mixing circuit for generating thereon the sampling signals. These signals are proportional to the finite impulse response of predetermined shape, and accordingly have a highly controllable frequency spectrum.

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Other info:

Inventors: Norris, Jerry L. (Dallas, TX, US)
Hartmann, Clinton S. (Richardson, TX, US)

Application Number: 869412
Filing Date: 1978-01-16
Publication_date: 1980-01-15
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Class(es): 370/204 333/193, 370/345, 370/533, 379/350
Other Classes:
US Patent Ref:

2681384	Jun, 1954	Guanella	325/39.
3071711	Jan, 1978	Beaupre et al.	179/2.
3633132	Jan, 1972	Hartemann	333/72.
3755761	Aug, 1973	Hartmann	333/72.
3898390	Aug, 1975	Wells et al.	179/2.
3979702	Sep, 1976	Hunsinger et al.	333/72.

Other Refs: Other References: "Principles of Communication Engineering", J. Wozencraft & I. Jacobs, (Wiley: New York) 1965, p. 597.
"Surface-Acoustic-Wave Devices for Signal Processing App.", J. Maines et al., Proc. IEEE, vol. 64, No. 5, May, 1976, p. 639f.
"Practical Surface Acoustic Wave Devices", M. Holland et al., Proc. IEEE, vol. 62, No. 5, May 1974, pp. 582-610.
37 Ultrasonic Transducers, 3--Surface Wave Transducers", J. deKlerk, Ultrasonics, Jan. 1971, pp. 35-48.