Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1993-07-08
2001-06-12
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C348S427100, C348S392100
Reexamination Certificate
active
06246827
ABSTRACT:
The inventions described herein relate to circuitry for deemphasizing high frequencies in a luminance signal and for reemphasizing high frequencies in a reproduced luminance signal, useful in a system for transmitting a wide bandwidth luminance signal through a narrow bandwidth channel in a backward compatible manner.
RELATED PATENTS & PATENT APPLICATIONS
The subject matter of the present application is related to the subject matter disclosed and claimed in the following prior co-pending U.S. patent applications, the claimed inventions of which were commonly assigned to or under an obligation of assignment to the assignee of the present application at the time the respective inventions were made, and in which prior applications at least one named inventor is in common with the present application: Ser. No. 531,070 filed May 31, 1990; Ser. No. 545,486 filed Jun. 29, 1990; Ser. No. 599,566 filed Oct. 18, 1990; Ser. No. 604,493 filed Oct. 26, 1990; Ser. No. 607,709 filed Nov. 1, 1990; Ser. No. 635,197 filed Jan. 2, 1991; Ser. No. 711,980 filed Jun. 7, 1991; Ser. No. 819,890 filed Jan. 13, 1992; Ser. No. 839,542 filed Feb. 24, 1992; Ser. No. 881,131 filed May 11, 1992; Ser. No. 910,491 filed Jul. 8, 1992; Ser. No. 996,525 filed Dec. 23, 1992; and Ser. No. 059,765 filed May 11, 1993, the disclosures of which prior applications are incorporated hereinto by reference thereto.
The specification and drawing of U.S. patent application Ser. No. 008,813 filed Jan. 25, 1993 entitled ADAPTIVE DEEMPHASIS AND REEMPHASIS OF HIGH FREQUENCIES IN VIDEO TAPE RECORDING, UTILIZING A RECORDED CONTROL SIGNAL, and assigned to Samsung Electronics Co., Ltd., are appended hereto for purposes of incorporation into this specification. The specification and drawing of U.S. patent application Ser. No. 819,890 filed Jan. 13, 1992 entitled DIGITAL MODULATORS FOR USE WITH SUB-NYQUIST SAMPLING OF RASTER-SCANNED SAMPLES OF IMAGE INTENSITY, and assigned to Samsung Electronics Co., Ltd., are appended hereto for purposes of incorporation into this specification.
The specification and drawings of U.S. patent application Ser. No. 08/059,765 filed May 11, 1993 entitled FREQUENCY-MULTIPLEXING FM LUMA SIGNAL WITH COLOR AND 2ND UNDER SIGNALS HAVING OVERLAPPING FREQUENCY SPECTRA, and assigned to Samsung Electronics Co., Ltd., are appended hereto for purposes of incorporation into this specification. The specification and drawings of U.S. patent application Ser. No. 07/787,690 filed Nov. 4, 1991 entitled SYSTEM FOR RECORDING AND REPRODUCING A WIDE BANDWIDTH VIDEO SIGNAL VIA A NARROW BANDWIDTH MEDIUM, and assigned to Samsung Electronics Co., Ltd., are appended hereto for purposes of incorporation into this specification. The specification and drawings of U.S. patent application Ser. No. 07/604,493 filed Oct. 26, 1990 entitled ADAPTIVE DEEMPHASIS AND REEMPHASIS OF HIGH FREQUENCIES IN A VIDEO SIGNAL, and assigned to Samsung Electronics Co., Ltd., are appended hereto for purposes of incorporation into this specification.
The specification and drawing of U.S. Pat. No. 5,113,262 issued May 12, 1992 to C. H. Strolle et alii and entitled VIDEO SIGNAL RECORDING SYSTEM ENABLING LIMITED BANDWIDTH RECORDING AND PLAYBACK are incorporated herein by reference. The specification and drawing of U.S. Pat. No. 5,218,449 issued Jun. 8, 1993 to J. W. Ko et alii and entitled NERVOUS CLOCK SIGNAL GENERATOR FOR VIDEO RECORDER are incorporated herein by reference. The inventions described and claimed in U.S. Pat. Nos. 5,113,262 and 5,218,449 were commonly assigned to or under an obligation of assignment to the assignee of the current application at the times the respective inventions were made by the current applicants and their co-inventors.
BACKGROUND OF THE INVENTION
The invention relates generally to a video signal processing system for processing a wide bandwidth video signal into a reduced bandwidth signal suitable for transmission and/or recording via a narrow bandwidth signal medium, whereby the information content of the wide bandwidth video signal is retained in the reduced bandwidth signal and the reduced bandwidth signal is compatible with conventional narrow bandwidth reception apparatus, and for receiving and/or reproducing and processing the transmitted reduced bandwidth signal for recovering therefrom the information content of the original wide bandwidth signal. The invention in certain of its aspects relates more particularly to signal processing useful in a narrow bandwidth format video cassette recorder (VCR), for converting a wide bandwidth input video signal to a reduced bandwidth video signal containing the information content of the input wide bandwidth video signal within the reduced bandwidth, whereby the reduced bandwidth video signal may be recorded and reproduced conventionally by such narrow bandwidth format VCR. The invention in other of its aspects relates more particularly to processing the reproduced narrow bandwidth video signal to recover the information content of the wide bandwidth video signal therefrom, whereby a wide bandwidth video signal may be reconstructed for yielding improved video bandwidth of the reproduced signal comparable to the full bandwidth of the input video signal, while maintaining backward compatibility of the recorded reduced bandwidth video signal for playing back video cassettes recorded by this improved video signal processing system on available conventional narrow bandwidth format VCRs or video cassette players (VCPs).
Conventional consumer type VCRs record video information onto video tape cassettes in one of several formats. The well-known VHS format system uses a relatively narrow bandwidth format and produces degraded picture quality in comparison to standard broadcast video chiefly because the recorded VHS format video signal has insufficient horizontal resolution. An enhanced VHS format type recording system, popularly called Super VHS or S-VHS, produces enhanced picture quality by recording a wider bandwidth video signal on the video tape cassette using a higher FM carrier frequency for the luminance information, thus yielding improved picture resolution. Such a format requires a higher FM carrier frequency, higher quality tape in the cassette and higher quality recording and playback mechanisms, heads and circuitry. However, the S-VHS format is not backward compatible with standard VHS format VCRs. I. e., although an S-VHS format VCR can reproduce (playback) cassettes recorded on either S-VHS format or standard VHS format VCRS, a standard VHS format VCR or VCP cannot play back cassettes recorded on S-VHS format VCRS.
It is desirable that an improved video recording system be able to record wider bandwidth video signals on a standard quality cassette than those recordable by conventional narrow bandwidth VCRs, while still maintaining backward compatibility with conventional narrow bandwidth VCRs, and not require especially high quality magnetic tape or record and playback mechanisms. That is, it is desirable that normal-quality, narrow-bandwidth recording tape medium video cassettes may be recordable with wider-bandwidth, higher-frequency video information using the improved system and be able to be compatibly played back by conventional narrow bandwidth VCRs without producing noticeable visual artifacts in the reproduced image, even if the conventional VCR may not be able to reproduce the full-bandwidth signal recorded on such a cassette.
It has long been a goal of video engineers to increase the amount of information transmitted through a given narrowband channel, such as an NTSC signal channel, which is limited to a nominal 4.2 MHz of useful bandwidth. Because the frame and line rates (temporal and vertical resolution) usually are fixed, restricting the bandwidth translates into restricting the horizontal resolution. In some cases, the nominal bandwidth of the channel is limited to 3 MHz or even 2.5 MHz, resulting in an image with insufficient horizontal resolution.
It has long been recognized that in scanned television systems, the signal energy is concentrated spectrally i
Ko Jung Wan
Limberg Allen LeRoy
Schnitzler Raymond
Strolle Christopher H.
Weckenbrock Hermann J.
Bushnell , Esq. Robert E.
Samsung Electronics Co,. Ltd.
Tran Thai
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