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#1
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Broadcast sound question
What exactly do you mean by maximum defination? Anytime you are dealing
with the sattelite/broadcast world, it is critical that you keep your output peak levels below 0 dBm or -20 dBFS. If you are running much hotter, you WILL get calls from those who receive the downlink. If you are looking to maximize the percieved "Loudness" of the program material, you can compress the snot out of the signal then boost the gain but depending on the program material, you will be doing more harm than good. MD "Gian Luca Specchia" wrote in message ... I'm working for a satellite television that use a mixer Yamaha DM 2000 . I would like to work with the maximum level possible before clip.....I mean near 0 dbfs Do You think it's wrong or Should I follow another way to achive the maximum definition ? -- |
#2
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Broadcast sound question
What exactly do you mean by maximum defination? Anytime you are dealing
with the sattelite/broadcast world, it is critical that you keep your output peak levels below 0 dBm or -20 dBFS. If you are running much hotter, you WILL get calls from those who receive the downlink. If you are looking to maximize the percieved "Loudness" of the program material, you can compress the snot out of the signal then boost the gain but depending on the program material, you will be doing more harm than good. MD "Gian Luca Specchia" wrote in message ... I'm working for a satellite television that use a mixer Yamaha DM 2000 . I would like to work with the maximum level possible before clip.....I mean near 0 dbfs Do You think it's wrong or Should I follow another way to achive the maximum definition ? -- |
#3
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Broadcast sound question
What exactly do you mean by maximum defination? Anytime you are dealing
with the sattelite/broadcast world, it is critical that you keep your output peak levels below 0 dBm or -20 dBFS. If you are running much hotter, you WILL get calls from those who receive the downlink. If you are looking to maximize the percieved "Loudness" of the program material, you can compress the snot out of the signal then boost the gain but depending on the program material, you will be doing more harm than good. |
#4
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Broadcast sound question
Gian Luca Specchia wrote:
I'm working for a satellite television that use a mixer Yamaha DM 2000 . I would like to work with the maximum level possible before clip.....I mean near 0 dbfs Why? If you are working that close to the line, you have to be very careful not to go over the limit. Leave yourself some headroom. Do You think it's wrong or Should I follow another way to achive the maximum definition ? Most of the video guys keep peaks around -20dBFS. This gives you some room to play if things go wrong. And with a 16 bit system keeping peaks at -20, you still have 76 dB of dynamic range to play with, which is a lot more than any TV program will ever use. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Broadcast sound question
On Thu, 4 Sep 2003 12:47:06 -0700, Gian Luca Specchia wrote
(in message ): I'm working for a satellite television that use a mixer Yamaha DM 2000 . I would like to work with the maximum level possible before clip.....I mean near 0 dbfs... -----------------------------snip---------------------------- Some of the other messages in this thread are incorrect, or at least far beyond my experience here in LA. The specs typically given for most of the American cable/sat services to which I've delivered jobs (particularly HBO and Showtime) usually request an operating level of -20 dB on a digital scale, with maximum peaks no louder than -10. I assume we're talking about a standard Lt/Rt stereo mix, as opposed to 5.1 surround. I have seen shows rejected for air when explosive peaks exceeded -8, but they'll usually allow you to go a little bit beyond -10, especially if it's under rare occasions. Home video mixes will usually give you a little more leeway, but I would make sure the maximum peaks are at least a couple of dB's under 0. And foreign deliverables seem to come under more scrutiny than domestic, for some reason. Dialog intelligibility is actually a much bigger concern. Some networks have average levels at which they'd like to see their dialog (typically -30 to -22, or thereabouts), but a lot of that is a question of taste and intent. For more, check over on the "Post" section of the Digidesign User Conference; I've seen several good discussions of "acceptable broadcast levels" over there. Also, you should ask the specific satellite TV network you're dealing with for a written copy of their specs, just so that you know precisely what they expect from you as far as channel assignments, set-up tones, identifying slates, average levels, peak levels, and so on. --MFW |
#6
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R: Broadcast sound question
And with a 16 bit system keeping peaks at -20, you still have 76 dB of dynamic range to play with, which is a lot more than any TV program will ever use. Consider guys that the system has 24 bits...........and onair (we do use mpeg 2 compression) the sound is low in level. This kind of broadcast has a poor level....if I reach the maximum peak of -20dbfs nobody will hear the program unless the television has a volume setted at the maximum....... Thanks To everyone......... |
#7
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R: Broadcast sound question
Gian Luca Specchia wrote:
And with a 16 bit system keeping peaks at -20, you still have 76 dB of dynamic range to play with, which is a lot more than any TV program will ever use. Consider guys that the system has 24 bits...........and onair (we do use mpeg 2 compression) the sound is low in level. That sounds like you need some limiting somewhere, then. Cranking the level on the distributed program up won't buy you anything since the AVC box on the transmitter airchain will just turn it back down again. This kind of broadcast has a poor level....if I reach the maximum peak of -20dbfs nobody will hear the program unless the television has a volume setted at the maximum....... Then use some limiting to bring average levels up while keeping peak levels low. Turning up the volume won't do you any good since the AVC will just turn it back down. Processing is your only real answer to bring average levels up. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#8
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Broadcast sound question
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#9
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R: Broadcast sound question
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#10
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R: Broadcast sound question
I can use either the peak meter of the consolle and a vu meter..........consider this: a tipical vu meter has 0vu at -20 dbfs if I reach the 0vu means that I have 12 db's more and this means -8 or -7 depending on the peak.....I don't want to be fixed on 0dbfs my question regarded only occasionally peaks...... thanks for your answers you are very precious.............. |
#11
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R: Broadcast sound question
My friend, you are screwing up the audio because you don't know the difference between a peak reading meter and a VU meter. I know Will.....maybe I'm little confused my head is about to exploding. Peak meter read the peaks of the program level....Vu read the avarege level without reading the peaks, strictly speaking about sound material the difference between the instruments is about -8db ( that's why usually 0vu correspond to-9 of Ppm or -8 if you are working with nagra). Some souncraft's consolle mounted a led integrated in the vu shell to achive the operator to see the peaks with the vu indication....... thanks man....... don't you think that the word dude is ancient.....??? :-) |
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