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Odd DM multichannel audio issue (or do I not understand how the -DSP cards are supposed to work)?
开云体育So for my home system I have a DM-MD16X16 that is a mix of “what I happened to get my hand on at any given moment” but is slowly being nudged in the 4K direction as I stumble across cards, etc. ? For the purposes of this question I have a TiVo Roamio and TiVo Edge each connected to DMC-4K-HD-DSP (HDCP2). The outputs are DM-RMC-4K-SCALER-Cs connected to DMC-CO-HD (obviously not 4K). EDID for both is currently 1080p Consumer HBR. ? I’m finding when I pause content on either of the TiVos on one output frequently (but not always!) upon resuming playback the output becomes noticeably louder for a few seconds then drops, which is annoying ?but serviceable. On another output you wind up with a few seconds of digital noise which is really obnoxious. ? It seems to happen more frequently with the DMC-4K-HD-DSPs but it wasn’t unheard of with the DMC-HD-DSPs that came before. Was kind of hoping that some of the extra magic in the 4K cards would help but this seems to be going the opposite direction. ? Both DM-RMC-4K-SCALER-Cs are configured to have the analog output enabled which (at least according to DM tool) forces 2-channel EDID. ? I thought when using the –DSP cards 2-channel outputs got a downmix, but it seems like in this case for that couple seconds that’s not happening and one output is coping with getting multichannel audio it but the other one isn’t. Coming from the commercial world where “2” is frequently a lot of channels I can’t say I’ve seen/worked around this myself but any ideas short of punting and going back to 2-channel EDID on the inputs. ? ? -- Lincoln King-Cliby, CTS, DMC-E-4K/T/D ? |
开云体育For both of my problem children (and the only two outputs that get any kind of serious usage) audio is via the HDMI output on the scalers – in one case to the display, in the other to a Cisco codec (For legal reasons I probably shouldn’t say how that isn’t a problem, LOL). I only mentioned the analog audio because of the note in DM tool that enabling analog audio forces 2-channel EDID which despite whatever the display device indicates “Enabling Analog Audio forces Audio EDID to Basic Audio (2ch PCM) ? My understanding/recollection was that with the –DSP cards the card generated a 2-channel downmix ?and delivered both the downmix and the original to the backplane but only one or the other was routed to the outputs… But now that I’m typing that I’m less confident of my memory (and again, I don’t know? that I’ve ever seen a –DSP card in a real project) ? ? -- Lincoln King-Cliby, CTS, DMC-E-4K/T/D ? From: [email protected] [mailto:[email protected]]
On Behalf Of ckangis
Sent: Thursday, May 19, 2022 2:19 PM To: [email protected] Subject: Re: [crestron] Odd DM multichannel audio issue (or do I not understand how the -DSP cards are supposed to work)? ? So the audio for your system is coming from the Scalers? Via the audio Phoenix connectors? |
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DSP cards are all we deal with out here in RESI land!? ?I have confirmed that with the -DSP input cards, that both the multi and 2-chan audio streams are available on the backplane and thus at the scalers, I assume that the device chooses what it wants/can handle...
I spoke with one of my DM experts at Crestron and he agreed that neither he nor I have seen this behavior before... a. Is this just on one input or multiple inputs? b. Does it happen if you set a 2-ch only EDID? c. Are these two scalers on the same output card/pair? and thus have you tried another output pair d. when using multi ch audio EDIDs, are the devices only capable of 2-chan audio streams?? It could be that they don't like the multi-ch and go 'Klunk' when you start up again as it switches to the 2-ch signal... Just musing... |
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Why are you going Scaler and back to another input card? This makes no sense.
-DSP card will provide either the original multuchannel OR the downmixed stereo (determined by destination's EDID) streight to the destination. Example:? BluRay player is connected to Input 1 -DSP card with multi channel (LPCM or DTS-HD/DTrueHD) EDID. On output 1, any card, you can have AVR getting the full stream. On output 3, any card, you can have a TV that accepts only 2ch stereo and it will get it, downconverted by the the sourse -DSP card. |
开云体育Hey Chris, ? a.?????? It is on multiple inputs all with DMC-4K-HD-DSP or DMC-HD-DSP cards; on the non—DSP cards I’m just using 2-channel EDID and this isn’t an issue. b.????? On the –DSP input cards it doesn’t seem to be a problem if I force 2-channel EDID; DM input EDID on the 4K-SCALER-Cs is already set to consumer 1080p 2 channel PCM c.?????? Nope, they’re fairly far apart (one is on output 2, the other is on output 5). Both are DMC-CO-HD cards because I haven’t accumulated enough of the -4K-CO-HD/-4K-HDO cards to swap that entire bank yet…and again this happened with the non-4K-versions of input cards and scalers as well so I don’t think that’s an individual input- or RMC- issue. d.????? I’m suspecting what’s happening is the source is flipping audio types when resuming from pause (“catching” it once in DM tools the audio line went to blank, then 2-ch PCM, then Dolby Digital 6 Ch and wobbled a couple times between those two); the display that gets noticeably louder for a few seconds I think supports faux-multchannel and may be getting a multichannel stream for a few seconds and doing its own down-mix before getting the 2-ch PCM; the Cisco CODEC definitely doesn’t support multichannel audio and neither the EDID it presents to the HDMI source (in this case a RMC-4K-SCALER-C) and the DM input EDID for the scaler are set to 2-channel only…. But shouldn’t the DSP be processing the digital signal regardless? It’s seeming like the DSP is “dropping out” and passing the raw audio with spectacularly poor results. Given that both outputs do “bad things” for the same amount of time I don’t think it’s a display/sink issue. ? -- Lincoln King-Cliby, CTS, DMC-E-4K/T/D ? From: [email protected] [mailto:[email protected]]
On Behalf Of ckangis
Sent: Thursday, May 19, 2022 5:37 PM To: [email protected] Subject: Re: [crestron] Odd DM multichannel audio issue (or do I not understand how the -DSP cards are supposed to work)? ? DSP cards are all we deal with out here in RESI land!? ?I have confirmed that with the -DSP input cards, that both the multi and 2-chan audio streams are available on the backplane and thus at the scalers, I assume that the device chooses
what it wants/can handle... |
开云体育Zac, ? I’m not running the Scaler into an input card. ? 16x16 Input 1 -> TiVo Roamio HDMI into a DMC-4K-HD-DSP (HDCP2 version of the card) 16x16 Input 2 -> TiVo Edge HDMI input a DMC-4K-HD-DSP (HDCP2 version of the card) ? 16x16 Output 2 -> DM-CO-HD ?HDBT into a DM-RMC-4K-SCALER-C, output of DM-RMC-4K-SCALER-C into a mid-range Samsung consumer display 16x16 Output 5 -> DM-CO-HD HDBT into a DM-RMC-4K-SCALER-C, output of DM-RMC-4K-SCALER-C into a DA for reasons then Cisco C60 HDMI input ? Despite the destination EDID being 2-channel (as configured on the DM input to the DM-RMC-4K-SCALER-C, and as reported by the Codec) it seems that for a few seconds instead of the 2-channel downmix the full 6-channel audio stream is being sent to the outputs for a couple seconds leading to really ugly audio (it’s kind of like listening to a dial up modem but with only the harsh edges and none of the sweet tones) ? ? ? -- Lincoln King-Cliby, CTS, DMC-E-4K/T/D ? From: [email protected] [mailto:[email protected]]
On Behalf Of zac.sparrow@...
Sent: Thursday, May 19, 2022 10:17 PM To: [email protected] Subject: Re: [crestron] Odd DM multichannel audio issue (or do I not understand how the -DSP cards are supposed to work)? ? Why are you going Scaler and back to another input card? This makes no sense. |
开云体育Not yet J… I keep hoping a CPU3 (or CPU4…?) will make itself available at a price I’m willing to pay but for now it’s the original CPU ? -- Lincoln King-Cliby, CTS, DMC-E-4K/T/D ? From: [email protected] [mailto:[email protected]]
On Behalf Of zac.sparrow@...
Sent: Friday, May 20, 2022 1:41 PM To: [email protected] Subject: Re: [crestron] Odd DM multichannel audio issue (or do I not understand how the -DSP cards are supposed to work)? ? Is the 16x16 with-CPU3 card by chance? |
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Keep your CPU2 card - it is better.
If this is only happening with the TiVo, I would blame it then. I have multiple multichannel sources at home, going to many stereo zones and have not heard this problem even once. The TiVo might be switching to LPCM when you pause, possibly you could foul it by removing LPCM from the input card edid (if that is even an option).? |