TH20102A

TH20102A - Equipment for demodulation And decoding of digital television data that are transmitted via satellite Ground transmission and cable based transmission

Info

Publication number: TH20102A
Application number: TH9501002706A
Authority: TH
Inventors: จอห์น ซิดเนย์ สทีวาร์ท นาย; คูมาร์ นาย (เอ็นเอ็นเอ็น) รามาสวามี่ย์
Original assignee: นาย ธเนศเปเรร่า; นาย โรจน์วิทย์เปเรร่า; นางสาว สนธยาสังขพงศ์; นาง ดารานีย์วัจนะวุฒิวงศ์
Filing date: 1995-10-27
Publication date: 1996-08-20

Abstract

ตัวสร้างสัญญาณดิจิตอลจะทำการดีมอดูลเลทและถอดรหัสแบบเลือกต่อสัญญาณที่ได้รับ จากรูปแบบร่วมของช่องการส่งคือช่องการส่งผ่านดาวเทียม ภาคพื้นดินและสายเคเบิล สัญญาณ ที่รับจะแทนข้อมูลภาพดิจิตอลที่ถูกย่อซึ่งก็คือ ข้อมูลภาพโทรทัศน์ และจะถูกเข้ารหัสในแบบหนึ่ง ของรูปแบบการเข้ารหัส (คือการเข้ารหัสโครงสร้างแนว หรือเจาะของอัตราการเข้ารหัส ที่เลือกได้) สัญญาณที่รับจะถูกมอดูเลทในรูปแบบหนึ่งของกลุ่มรูปแบบการมอดูเลท (คือ PAM QAM หรือ PSK) ตัวดีมอดูเลทจะทำการดีมอดูเลทต่อสัญญาณที่ถูกมอดูเลทในกลุ่มของรูปแบบ การมอดูเลทกลุ่มหนึ่ง และตัวถอดรหัสจะทำการถอดรหัสแบบเลือกต่อสัญญาณดีมอดูเลทที่ถูกเข้า รหัสแบบหนึ่งของกลุ่มรูปแบบการเข้ารหัส The digital signal generator will demodulate and decode the received signals. From the common form of the transmission channel is the satellite transmission channel. Terrestrial and the receiving signal cable represents the condensed digital image data, that is Television picture data And will be encoded in one way Of the coding scheme (Is to encode the vertical structure The signal received is modulated in one of the modulation scheme groups (ie PAM QAM or PSK). Modulated in a group of patterns Modulation And the decoder will decode selectively to the incoming demodulation signal One of the cipher group codes.

Claims

1. In the system for receiving the modulated signal from the integrated model of the transmission channel. Such a signal Represents the abbreviated digital data that is encrypted in a group of encryption schemes. And group show One of the modulation styles A method that consists of steps of Choosing a modulation scheme for the demodulation from among modulation schemes that include QAM and PSK, such modulation modulation according to the modulation scheme selected as follows. Said to create Demodulation signal Choosing an encoding format for decoding from among a group of formats And decoding the said demodulation according to the aforementioned encoding scheme to generate Demodulation and decoding signals 2. Method for claim 1 that includes following the procedure of modulating model selection. For the demodulation from during the modulation scheme that includes PAM 3. Method according to claim 1, which is included in the process of choosing the encoding format. For decoding from the intersection of the coding scheme, including the drill encoding format and the horizontal structure coding format 4. Method according to claim 1, where the procedure for selecting the modulation format is as follows: Include The process of choosing between the combined form of the submission channel including at least two from within. Between satellite, cable and terrestrial channels 5. Method according to claim 1 where such a PSK modulation scheme is a QPSK modulation scheme. 6. In the system for receiving signals. Modulation from the combined form of the transmission channel. Such a signal Represents the abbreviated digital data that is encrypted in a group of encryption schemes. And group show One of the modulation styles The combined format of the aforementioned transmission channels reaches at least two from Between satellite, cable and terrestrial channels Signal processing equipment consists of The modulator for the selective modulation of such modulated signals from during Modulation schemes that include PAM, QAM, and PSK to generate a demodulation and decoder for selective decoding, such demodulation from in between. The encoding scheme that includes the punched encryption format. And encoded format, parallels structure to create Demodulation and decoding signals 7. Equipment according to claim 6, where such information is visual information such as phone model information 8. Equipment according to claim 6, where each form of the group of such encoding schemes will use a rate. The encoder is selected from a group of different encoding rates. 9. Device according to claim 6, where the decoder And the aforementioned modulator will do the job With a variable clock rate of 1 0. In the system for receiving modulated signals from the combined form of such transmission channels represents the abbreviated digital data encoded in a group of encoded formats and One group representation of modulation patterns A method that consists of steps of Selection of modulation patterns for demodulation from among the group of modulation patterns See such Demodulation of the aforementioned modulated signal according to the aforementioned modulation pattern to generate Demodulation signal Choosing a code format for decoding from during the encoding scheme Including punched encryption format And encoding format, orientation structure and decoding of such demodulation according to the aforementioned encoding scheme to generate Demodulation and decoding signal 1 1. Method according to claim 10, which is included in the following steps of the selection of the modulation scheme. For demodulation from during modulation formats including QAM and PAM 1.

2. Method according to claim 11 that includes following the procedure of modulating model selection. For demodulation from during modulation schemes that include further with PAM 1.

3. Method according to claim 11, where such PSK modulation scheme is QPSK 1 modulation scheme.

4. Method according to claim 10, where the procedure for selecting such modulation scheme includes The process of choosing between the combined form of the submission channel including at least two from within. Between satellite, cable and terrestrial channels