Lee V Hedlund

US Patent:

43957382, Jul 26, 1983

Filed:

Nov 26, 1980

Appl. No.:

6/210788

Inventors:

Lee V. Hedlund - Maple Shade NJ
Donald G. Herzog - Collingswood NJ

Assignee:

RCA Corporation - New York NY

International Classification:

A04N 576

US Classification:

358335

Abstract:

A tape has a format of the type wherein digital video information is recorded with each frame or field disposed on a set of multiple tracks and with at least one track being intended for replay during scene search modes of operation, only the most significant bits of pixels are recorded on the search tracks.

US Patent:

40939596, Jun 6, 1978

Filed:

Mar 14, 1977

Appl. No.:

5/777538

Inventors:

Lee Vern Hedlund - Cinnaminson NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H04N 902

US Classification:

358 4

Abstract:

In a still frame playback mode, a video disc player reproduces a carrier signal which is frequency modulated in accordance with a composite video signal representative of successive repetitions of two interlaced image fields constituting a single image frame and comprising a luminance signal component, a chrominance signal component and synchronizing information, including a color burst. An FM demodulator develops a composite video signal, which is characterized by a 180. degree. phase discontinuity in the chrominance signal component between the frame end and the succeeding frame start. A first inverter circuit inverts the phase of the color burst every other image frame piror to the processing of the composite video signal output in time base correction and drop-out compensation circuits. The corrected output is supplied to a second inverting stage where the phase of the chrominance signal component, exclusive of the color burst, is inverted every other image frame, to provide an output composite video signal conforming to the NTSC format.

US Patent:

41387414, Feb 6, 1979

Filed:

Mar 14, 1977

Appl. No.:

5/777475

Inventors:

Lee V. Hedlund - Cinnaminson NJ
Arch C. Luther - Woodstown NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G11B 700

US Classification:

365234

Abstract:

Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information, which can represent, for example, television video, x-ray, or digital data signals, are addressed by codes that identify the track on which the information is recorded preceded by the address code. The recording mechanism can record a new track adjacent to the previous track if the disc has been moved between recordings. There are also means for compensating for eccentricity errors introduced by small changes in the radial dimensions of the disc. The spacing between tracks is typically 2. 5 microns although the eccentricity errors may exceed the span of ten tracks. Typically, 4,000 tracks per cm can be recorded.

US Patent:

41422090, Feb 27, 1979

Filed:

Mar 14, 1977

Appl. No.:

5/777474

Inventors:

Lee V. Hedlund - Cinnaminson NJ
Ronald P. Fink - Marlton NJ
David I. Wright - Riverton NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G11B 700

US Classification:

358128

Abstract:

Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information, which can represent, for example, television video, x-ray, or digital data signals, are addressed by codes that identify the track on which the information is recored preceded by the address code. The recording mechanism can record a new track adjacent to the previous track if the disc has been moved between recordings. There are also means for compensating for eccentricity errors introduced by small changes in the radial dimensions of the disc. The spacing between tracks is typically 2. 5 microns although the eccentricity errors may exceed the span of ten tracks. Typically, 4,000 tracks per cm can be recorded.

US Patent:

43886574, Jun 14, 1983

Filed:

Nov 25, 1980

Appl. No.:

6/210154

Inventors:

Lee V. Hedlund - Maple Shade NJ
Donald G. Herzog - Collingswood NJ
Franz L. Putzrath - Haddonfield NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G11B 1514

US Classification:

360 721

Abstract:

In a VTR of the type having information recorded in adjacent tracks disposed angularly across the direction of tape travel, a search mode playback arrangement is incorporated having a pair of transducer gaps which are alternately enabled to continuously pickup coherent information while the playback arrangement scans across adjacent tracks during a search mode.

US Patent:

43587984, Nov 9, 1982

Filed:

Dec 5, 1980

Appl. No.:

6/213219

Inventors:

Lee V. Hedlund - Maple Shade NJ
Richard E. Mathys - Clementon NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G11B 1546

US Classification:

360 73

Abstract:

A speed control signal for a record segment is generated from starting speed and starting time information signals, an ending speed information signal, and a signal indicative of the duration of the segment. Provision is made for "pre-roll" (stopping the tape ahead of the exact cue point). Duration can be entered directly or computed from start and end times. The speed control signal is applied to a capstan servo, while a cue logic servo controls a reel servo.

US Patent:

41602706, Jul 3, 1979

Filed:

Sep 22, 1977

Appl. No.:

5/835589

Inventors:

Arthur M. Goldschmidt - Moorestown NJ
Lee V. Hedlund - Cinnaminson NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H04N 576
G11B 1700
G11B 2110

US Classification:

358128

Abstract:

A servo loop is provided in an optical record/play apparatus for controlling a motor assembly providing relative motion in a radial direction, with respect to a disc record, between the disc record and a beam of focused light. In a record mode of operation for the apparatus, the loop drives the motor at a rate providing a constant speed radial relative motion, as the disc record is rotated, to enable the inscription of a spiral information track on the disc. In a playback mode of operation for the apparatus, the loop drives the motor at a variable rate providing relative radial motion which assures the centering of the beam of focused light on a spiral information track formed in the disc record medium as the disc is rotated.

US Patent:

44424655, Apr 10, 1984

Filed:

Oct 20, 1981

Appl. No.:

6/313314

Inventors:

Lee V. Hedlund - Maple Shade NJ
Jerome D. Shields - Somerdale NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G11B 1560

US Classification:

36013023

Abstract:

When tape in a VTR moves in the same direction as the direction of peripheral motion of a headwheel across which the tape passes, release of one end of the tape during rewind may cause the tape to whip around the headwheel and jam. The tape accumulation resulting from the motion is accommodated by a tapered open-ended tunnel. After accumulation in the tunnel, the tape is reeled in by the take-up reel.