KR987000746A

KR987000746A - ATV / MPEG sync system

Info

Publication number: KR987000746A
Application number: KR1019970703730A
Authority: KR
Inventors: 리챠드 더블류. 시타; 마크 피모프; 티모시 지. 라우드
Original assignee: 리차드 에프. 비트커스; 제니스 일렉트로닉스 코포레이션
Priority date: 1995-04-06
Filing date: 1996-04-03
Publication date: 1998-03-30
Also published as: KR100313653B1

Abstract

ATV시스템(16, 18, 20)은 가변길이를 가진 데이타의 기본적인 스트림들을 동기 정보가 없고, 다중화되고 고정된 길이를 가진 다수의 데이타 패킷들로 구성된 다중 레벨 심볼 신호로 인코드 한다. 고정된 길이의 데이타 패킷들은 반복되는 데이타 세그먼트의 피일드내에 배열되어 있다. 데이타 세그먼트는 데이타 시그먼트 동기를, 그리고 피일드 동기를 포함하고 있다. 데이타 세그먼트들의 파일들은 압축된 캐리어(carrier) VSB로 변조(28)된 형태로 전송된다. ATV 수신기에서는, 데이타 세그먼트 동기는 고정된 길이를 가진 데이타 패킷의 시작점을 식별하는 타이밍 신호를 발생시키는데 사용되어진다.The ATV systems 16, 18 and 20 encode basic streams of variable length data into a multilevel symbol signal composed of multiple data packets having no synchronization information and multiplexed and fixed lengths. Data packets of fixed length are arranged in the feed of repeated data segments. The data segment contains data segment synchronization and feed synchronization. The files of the data segments are transmitted in a modulated form 28 with a compressed carrier VSB. In an ATV receiver, data segment synchronization is used to generate a timing signal that identifies the beginning of a data packet with a fixed length.

한 실시예에 있어서는, 패킷 동기 신호가 데이타의 기본적인 스트림들을 복구시키기 위해 복구된 고정된 길이의 데이타 패킷안으로 삽입되어진다. 다른 실시예에서는, 데이타의 기본적인 스트림들을 복수시키는 과정은 패킷 동기 신호를 삽입시키지 않고, 수행되어진다.In one embodiment, a packet sync signal is inserted into the recovered fixed length data packet to recover the basic streams of data. In another embodiment, the process of a plurality of basic streams of data is performed without inserting a packet sync signal.

Description

ATV / MPEG sync system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 VSB 프레임 형태를 도시한 도면.1 shows a VSB frame form.

제2도는 본 발명에 따라 만들어진 전송기를 도시한 개략블록도.2 is a schematic block diagram illustrating a transmitter made in accordance with the present invention.

제3a, 3b도는 본 발명에 따라 수정된 MPEG전송 패킷들을 나타낸 도면.3a and 3b show MPEG transport packets modified according to the present invention.

제4도는 제2도의 전송기로부터 나온 신호들을 수신하기 위한 수신기를 도시한 개략블록도.4 is a schematic block diagram illustrating a receiver for receiving signals from the transmitter of FIG.

Claims

A data signaling system comprising: means for formatting a plurality of data signals into a plurality of transport packets having no synchronization information, multiplexed, and fixed length, and the transport packets into multi-level symbols Means for encoding, means for arranging the transport packets within a repeat of the repeated data segments, and means for transmitting the feeds of the data segments, each of the data segments comprising a data segment sync signal; And each of the feeds includes a feed synchronization signal.

2. The system of claim 1, comprising means for adding a pilot in the form of a DC offset to the transmitted signal.

2. The apparatus of claim 1, further comprising: means for receiving the transmitted feeds of the data segment, means for generating a timing signal indicative of the starting point of each of the fixed length packets in response to the data segment sync signal; Means for recovering the digital data from the fixed length packets in response to the timing signal.

2. The data signaling system of claim 1, comprising means for inserting a packet synchronization signal at each starting point of the received fixed length packets in response to the timing signal.

The data signal according to any one of claims 1 to 4, wherein the data signals are in the form of basic streams of data, and are composed of MPEG-compressed video and audio information, and the basic data streams have MPEG synchronization information. And multiplexed and formatted into a plurality of MPEG transport packets having a fixed length, the system comprising means for removing the MPEG synchronization information before transmitting the MPEG transport packets to encoding means. And said transmission means delivers the feeds of the data segments as a modulated signal of a vestigial sideband (VSB).

A receiver for receiving multiple transport packets of multiplexed and fixed lengths, having no synchronization information arranged in the feed of repeated data segments, each data segment containing a data segment sync, each feed Includes a feed sync, and is encoded as a multilevel symbol, the receiver comprising: means for demodulating the received transport packets, means for recovering the data segment sync, and in response to the data segment sync, Means for generating a timing signal and means for recovering the transport packets under control of the timing signal.

7. The receiver of claim 6, wherein the timing signal identifies the starting point of each of the transport packets, and the receiver comprises means for demultiplexing the recovered transport packets.

7. The receiver of claim 6 comprising means for inserting a packet sync signal at each starting point of the transport packets in response to the timing signal and means for demultiplexing the transport packets.

The compressed MPEG according to any one of claims 6 to 8, wherein the multiplexed, fixed length of the plurality of received transport packets is in MPEG form, wherein the MPEG form is arranged in a field of repeated data segments and compressed MPEG. Receiver with video and audio data.

A method of transmitting a digital multilevel symbol signal, the method comprising: encoding basic streams of data into a multilevel symbol signal consisting of a plurality of data having no packet synchronization information, multiplexed, and having a fixed length; Arranging the data packets within the repeated data segments, and transmitting the failed data segments, each data segment having data segment synchronization, each feed having a feedback synchronization How to characterized.

11. The method of claim 10, further comprising: receiving feeds of transmitted data segments, using a data segment identifying a starting point of data packets having a fixed length, and in response to the identifying step, having a fixed length; Recovering the elementary streams of data from the data packets.

12. The method of claim 11, wherein in the step of identifying, generating a timing signal and inserting a packet synchronization signal at the start of transport packets in response to the timing signal.

11. The method of claim 10 including adding a pilot in the form of DC offset to a multilevel symbol signal, and VSB modulating the packets for transmission.

14. The fixed length transport packets provided in the multiplexing step are in MPEG form, the method further comprising: MPEG transmission from the transport packets before encoding the transport packets into multilevel symbols. Removing the information.

In a method for receiving an ATV signal having MPEG compressed audio and video data in the form of basic streams of data formatted into a plurality of fixed length MPEG transport packets, MPEG synchronization information is removed. The transport packets are encoded as multilevel symbols, arranged in the feeds of repeated data segments, each data segment including data segment synchronization, each feed synchronization, and the method described above. Receiving and demodulating transport packets, restoring data segment syncs, generating a timing signal in response to recovered data segment syncs, and recovering transport packets under control of the timing signal. Method comprising the steps.

16. The method of claim 15, further comprising recovering the transport packets by reinserting the MPEG sync information in the transport packets in response to the timing signal, and having the reinserted MPEG sync information to recover the basic streams of data. Demultiplexing transport packets that are present.

※ Note: The disclosure is based on the initial application.