Nicola J Fedele, Alfonse Acampora, Peter J Burt, Rajesh Hingorani: Compressed quantized image-data transmission technique suitable for use in teleconferencing. RCA Corporation, Joseph S Tripoli, George J Seligsohn, May 5, 1987: US04663660 (80 worldwide citation)

A technique for transmitting compressed quantized image-data from a transmitter to a receiver over a limited bandwidth communication channel employs temporal differential pulse code modulation incorporating pyramid image processing spectrum analyzers and synthesizers. This technique permits the sele ...

Alfonse Acampora: Pre-emphasis and de-emphasis filters for a composite NTSC format video signal. RCA Corporation, Joseph S Tripoli, George E Haas, George J Seligsohn, December 24, 1985: US04561012 (29 worldwide citation)

Phase reversal of solely the chrominance component of only alternate frames of an NTSC format signal prior to pre-emphasis and again subsequent to de-emphasis permits simpler and less costly filter structure to be employed without any loss of filtering capability.

Alfonse Acampora: Digital signal separation filters. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, June 18, 1985: US04524423 (18 worldwide citation)

A digital finite impulse response (FIR) filter is provided in which a plurality of weighted signal taps are symmetrically located in time about a weighted center tap. Weighted signals from the symmetrically located taps are summed at a first point in the filter, which sum is then combined with signa ...

Richard M Bunting, Alfonse Acampora: Apparatus for frame-to-frame comb filtering composite TV signal. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, February 5, 1985: US04498100 (18 worldwide citation)

Frame-to-frame comb filter for separating chrominance and luminance components of composite video signals produce distortions around the periphery of reproduced moving images. The color distortions are corrected by selectively adding the combed luminance signal to the combed chrominance signal durin ...

Alfonse Acampora: Arithmetic circuits for digital filters. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, February 7, 1984: US04430721 (16 worldwide citation)

A digital filter is provided which selectively employs binary arithmetic and offset two's complement arithmetic in an adder ladder to protect against signal overflows and underflows, as well as to minimize adder size. Signal overflows and underflows are prevented by performing subtraction and certai ...

Henry G Lewis Jr, Alfonse Acampora: Digital signal processor with symmetrical transfer characteristic. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, December 20, 1983: US04422094 (15 worldwide citation)

A digital memory is provided which contains digital data words representative of a desired symmetrical transfer characteristic of a digital signal processor. Digital signals which are to be processed are applied to the address inputs of the memory, producing output signals in conformance with the de ...

Alfonse Acampora: Sampled data filter system as for a digital TV. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, September 17, 1985: US04542475 (15 worldwide citation)

Low pass sampled data filters tend to produce pre- and post- over/undershoots in the output signal in response to input signal transitions. These over/undershoots or sequence of artifacts are eliminated in the present system by the following method. The input signal is monitored for transitions exce ...

Alfonse Acampora: Synchronizing transmissions from two earth stations to satellite. RCA Corporation, Samuel Cohen, Carl V Olson, Robert L Troike, March 16, 1982: US04320503 (15 worldwide citation)

A method of synchronizing the transmissions of alternate video fields or frames from two earth stations over a common uplink channel to a satellite so that the fields or frames arrive in interleaved time periods. A synchronizing pulse is transmitted over a separate channel from a first station to th ...

Chung H Lu, Alfonse Acampora: Apparatus for noise reducing composite video signal. RCA Corporation, E M Whitacre, P J Rasmussen, E P Herrmann, April 12, 1988: US04737850 (11 worldwide citation)

In field/frame recursive filters for providing noise reduction to composite video signal, inversion of the chrominance component of the composite video signal is obviated by selecting nearest neighbor in-phase field/frame delayed signals for recursion. The system arbitrates between two or more neare ...

Alfonse Acampora, Chung H Lu: Non-linear processor for reducing the dynamic range of a digitized error signal. RCA Corporation, Joseph S Tripoli, Henry I Steckler, August 4, 1987: US04684983 (11 worldwide citation)

In systems in which the current digitized level value of a synthesized-signal sample (e.g., a television video signal sample) is determined by summing a transmitted error-signal-sample level value and a delayed previous synthesized-signal-sample level value, the dynamic range of the transmitted erro ...