Archived — Notice No. SMBR-003-94
Notice No. SMBR-003-94
Implementation of Digital Television by Broadcasting Undertakings
Digital television promises to bring about major improvements in spectrum efficiency and delivery economics for current 525 line based and future Advanced Television (ATV) services. However, to fully realize these and other potential benefits to the broadcasting system and to consumers, careful consideration is required of associated interoperability, multiple vendor and standards issues in order to limit unnecessary technical barriers, incompatibilities and redundancies as digital television signals travel from source to consumer.
Digital television has been the subject of extensive discussions within Advanced Broadcasting Systems of Canada (ABSOC). ABSOC members include representatives of all aspects of the broadcast industry.
Industry Canada supports the efforts of ABSOC toward open, non-proprietary system solutions for digital television.
With respect to 525 line based systems, ABSOC recently provided the following initial recommendations for a digital video compression (DVC) standard for Canada:
ABSOC Recommendations for a 525 line based DVC Standard for Canada.
The following elements pertain to Digital Video Compression application in the context of Broadcasting.
- Video and Audio
All digital video compression decoder equipment placed in Canada should be capable of reconstructing an appropriate:
- picture signal when receiving a signal consisting of the MPEG 2 Main profile, Main level, as approved by ISO.
- audio signal when receiving a signal compressed as per the
North American ATV standard.
- Transport Bit Stream
The Transport bit stream must comply with the MPEG 2 syntax as approved by ISO, and be interoperable with the North American ATV standard.
- Information bit-rates supported
- For cable systems application, a nominal service information bit-rate of 38Mb/s should be supported. (Excluding forward error correction (FEC) overhead.)
- For satellite to cable head-end pass-through / DTH application, a nominal service information bit-rate of 38Mb/s should be supported. (Excluding forward error correction (FEC) overhead.) (Note: Subject to technical feasibility for specific satellite to cable head-end service applications when using 27 MHz Ku-band satellite channels.)
Industry Canada supports these initial recommendations and will expect all carriage systems operators to promote and comply with them. These recommendations, followed by further consideration by ABSOC of the issues of encryption and conditional access, software elements relating to service application within the transport system, and accommodation of the carriage of advanced television (ATV) will lead to the achievement of the principle of interoperability among carriage systems through commonality in equipment available from multiple vendors. This principle is in the best interests of the Canadian broadcasting system and the consumer.
Interested parties may submit comments concerning the ABSOC recommendations and digital television in general to the Director General, Spectrum Engineering Branch, Industry Canada, 300 Slater Street, Ottawa, Ontario, K1A 0C8, or to Internet address: email@example.com
Comments should be postmarked no later than 45 days from the date of publication of this notice. Comments received will be made available on written request to the Director General.
Dated at Ottawa this 4thday of august 1994.
Director General Spectrum Engineering Branch
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