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Communication system

The communication system addresses compatibility and signal attenuation issues by varying signal points for NTSC and HDTV transmission, enabling simultaneous broadcast and future data expansion, ensuring reliable and efficient digital satellite services.

Inactive Publication Date: 2008-04-01
PANASONIC HOLDINGS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system ensures compatible digital satellite broadcast services for both NTSC and HDTV, reduces signal attenuation areas, and allows for increased data transmission capacity, ensuring that both existing and advanced receivers can receive transmissions without interruption.

Problems solved by technology

However, the TV broadcast service is a public business and cannot go further without considering the interests and benefits of viewers.
This causes the corresponding NTSC channels to be unavailable during the transmission of the HDTV signal.
In any analogue TV broadcast service, there are developed a lot of signal attenuating or shadow regions within its service area due to structural obstacles, geographical inconveniences, or signal interference from a neighbor station.
When the TV signal is an analogue fromform, it can be intercepted more or less at such signal attenuating regions although its reproduced picture is low in quality.
This disadvantage is critically hostile to the development of any digital TV system.

Method used

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Examples

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Comparison scheme
Effect test

embodiment 1

[0228]One embodiment of the present invention will be described referring to the relevant drawings.

[0229]In the preferred embodiment of the invention both the transmission apparatus, which comprises a transmitter for transmitting a digital HDTV signal or other digital signal and a receiver for receiving the transmitted signal, and the recording and reproducing apparatus, which records the digital HDTV signal or other digital signal on a magnetic tape or other recording medium and reproduces the recorded signal from said medium, are described.

[0230]It should be noted, however, that the configuration, operation, and principle of the digital modulator and demodulator, error correction encoder and decoder, and the encoder and decoder for image coding the HDTV signal are common to the transmission apparatus and the recording and reproducing apparatus, and apply essentially the same technologies. Therefore, to more concisely describe each embodiment, the block diagrams for either the tran...

embodiment 2

[0336]A second embodiment of the present invention is featured in which the physical multi-level arrangement of the first embodiment is divided into small levels through e.g. discrimination in error correction capability, thus forming a logic multi-level construction. In the first embodiment, each multi-level channel has different levels in the electricalelectric signal amplitude or physical demodulating capability. The second embodiment offers different levels in the logic reproduction capability such as error correction. For example, the data D1 in a multi-level channel is divided into two, D1-1 and D1-2, components and D1-1 is more increased in the error correction capability than D1-2 for discrimination. Accordingly, as the error detection and correction capability is different between D1-1 and D1-2 at demodulation, D1-1 can successfully be reproduced within a given error rate when the C / N level of an original transmitting signal is as low as disenabling the reproduction of D1-2...

embodiment 3

[0359]A third embodiment of the present invention will be described referring to the relevant drawings.

[0360]FIG. 29 is a schematic total view illustrating the third embodiment in the form of a digital TV broadcasting system. An input video signal 402 of super high resolution TV image is fed to an input unit 403 of a first video encoder 401. Then, the signal is divided by a divider circuit 404 into three, first, second, and third, data streams which are transmitted to a compressing circuit 405 for data compression before being further delivered.

[0361]Equally, other three input video signals 406, 407, and 408 are fed to a second 409, a third 410, and a fourth video encoder 411 respectively which all are arranged identical in construction to the first video encoder 401 for data compression.

[0362]The four first data streams from their respective encoders 401, 409, 410, and 411 are transferred to a first multiplexer 413 of a multiplexer 412 where they are time multiplexed by a TDM proce...

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PUM

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Abstract

At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and / or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of application Ser. No. 07 / 857,627, filed Mar. 25, 1992, pending.[0002]This is a continuation of Ser. No. 09 / 686,463, filed Oct. 12, 2000 now abandoned, which is a reissue application of U.S. Pat. No. 5,600,672, issued Feb. 4, 1997, and is a divisional application of reissue application Ser. No. 09 / 244,037, filed Feb. 4, 1999, which is also a reissue application of U.S. Pat. No. 5,600,672, issued Feb. 4, 1997 which is a Continuation-In-Part of application Ser. No. 07 / 857,627, filed Mar. 25, 1992 now abandoned. Further reissue divisional applications have been filed, all of which are reissues of U.S. Pat. No. 6,500,672. These further applications are: Ser. Nos. 09 / 677,421, filed Oct. 5, 2000; 09 / 678,014, filed Oct. 5, 2000; 09 / 677,420, filed Oct. 5, 2000; 09 / 680,177, filed Oct. 5, 2000; 09 / 680,176, filed Oct. 5, 2000; 09 / 686,467, filed Oct. 12, 2000; 09 / 686,466, filed Oct. 12, 2000; 09 / 688,028, fi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L5/16H04L27/10
CPCH04L27/36H04L27/38H04L27/34H04L27/16H04L27/0014H04L2027/0016H04L2027/0026H04L2027/0069H04L27/0008H04L27/066H04L1/0042H04L1/0047H04L1/006H04L2001/0093H04N21/2383H04N21/4425H04N21/4382H04L27/3405
Owner PANASONIC HOLDINGS CORP