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Cinemateq queries quality of digital connections

Discussion in 'Technology News' started by The News Bot, Jan 19, 2005.

  1. The News Bot

    The News Bot
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  2. Gordon @ Convergent AV

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    Should point out that this information is actually not completely correct.....HDMI outputs on several DVD players can be SD interlaced and are not always 480P/576P or above. Thus allowing you to keep your warranty intact without having to go to SDI mods for digital pathway and ensuring the bulk of the processing is done within the higher quality processing engine....if of course your scaler has DVI or HDMI inputs that are HDCP compliant and accept those signals. I agree though that for most SDI is a higher cost and more accurate option.

    Also forthcoming and CURRENT HD satellite receivers output 720P and 1080i native material on DVI and HDMI. SDI modification is of no use for these sources.

    Hope this is of use.

    Gordon
     
  3. KraGorn

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    As for 'future proof' (to paraphrase what they said), Jim at Lumagen reckons SDI mods for HD players may be impossible if Hollywood gets its' way with the manufacturers, he also said that mods to SD players are coming under pressure from the same camp .. if this happens then there's nothing 'future proof' about SDI it would seem.
     
  4. 4bettermovies

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    Thank you for your statements about digital video claims, regarding the recently published cinemateq newsletter. May be this was a little bit misleading, so please let us give some information from our side:


    The HDCP interface has like SDI also a possibility to transmit an unprocessed interlaced signal, so may be the statement from cinemateq regarding the SDI interface was not describing the situation in a 100% perfect way, but during the last time and still up today, the great majority of DVD-Players with HDMI output and may be all DVD-Players with DVI output did not provide an "unprocessed" digital interlaced signal.

    Therefore we saw no need to introduce HDMI-Inputs in our scaler unit during the time being - most of the digital DVD player signals had been already processed. Filmmode detection is done (good or bad) and today the signal now more and more is already scaled into HDTV resolution 720p or 1080i.

    What we think: Digital HDMI-/DVI-signals in HDTV resolution, coming from DVD player or HDTV-satellite-receiver, can hardly be improved inside any scaler. If the signal is processed perfectly or if it is real HDTV, the best thing you can do with this signal is just to bypass or to switch it to the display.

    This display should be a HDTV compliant display today and as well in the future. Our statement is, that processing of already processed HDMI or DVI signals is not the most interesting and not the most important feature of a scaler. Switching or amplifying of HDMI or DVI signals is more important for coming home cinema applications.

    Now we are very happy to hear from John Dawson (President, Arcam), that the two Models Arcam DV79 and DV29 include interlaced formats to the HDMI interface. If there is a interlaced signal included to the HDMI interface, it is a also a possibility to process a "unprocessed signal" inside the scaler. From the perspective of a high end videoscaler company, this is also the highly appreciated "unprocessed" digital input signal.

    However, from a technical perspective, SDI is still a simple and professional interface for many existing new and older DVD-Players, which provides already the best possible signal quality.

    SDI can easily be transmitted up to 300 meters with a simple copper cable and is a true interlaced signal (4:2:2), if it is not HD-SDI.

    But we agree that HDMI will become a world consumer standard for transporting uncompressed digital video in the near future - we are already planning to incorporate HDMI for coming cinemateq products, including HDCP function and including all licensing requirements of course.

    Best regards
    klaus
     

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