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Lossy or Lossless? Please use this forum to post spectral and frequency analysis posts about shows you have your doubts about.

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  #1  
Old 2005-05-25, 06:55 AM
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Question source question killers 2005-02-25.

I recorded this show by myself, so thereīs no lossy stage in the line on my side.
How could this happen.

cable FM > hdd (wav; 44.1 kHz, 16 bit) recorded from fm4 (http://fm4.orf.at/spielzimmer)

I know they broadcast also over satellite and have a live stream. Do they store their shows on their computers in a lossy format? Or is the cable broadcast sourced from satellite? Any others ideas? Would you seed such a show, is this allowed here?
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  #2  
Old 2005-05-25, 07:21 AM
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Re: source question killers 2005-02-25.

The only help I could be (and I know it's not much) is to say that if it was streamed over the internet, I'm pretty certain it was compressed in one way or another. I'm not sure about cable FM though.
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Old 2005-05-25, 08:15 AM
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Re: source question killers 2005-02-25.

Thanks Ted. I tried around and compared the cable broadcast to their terrestrial. They came out with similar spectrals.
Iīll try this again with a cast which Iīm sure that it is live. (Bonus Track 00:00 tonight).
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Old 2005-05-25, 09:50 AM
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Re: source question killers 2005-02-25.

FM broadcasts are frequency limited. You are most likely seeing the effect of that.
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Old 2005-05-25, 11:12 AM
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Re: source question killers 2005-02-25.

What makes me feel strange about this spectrals are the blocked out areas below the frequency cut off. Also there is no straight cut off.
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Old 2005-05-25, 12:07 PM
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Re: source question killers 2005-02-25.

Well, broadcasts from lossy sources (or broadcasts that go through a lossy stage - usually mp2 - before they arrive at your home) are not really uncommon.

Sad as it is, I'd say it's relatively normal for a broadcast.
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Old 2005-05-25, 07:49 PM
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Re: source question killers 2005-02-25.

This is a clip of a live cut of fm4 (terrestrial 103,8 MHz here in Vienna) from Bonustrack, you can call in there, itīs like talk radio. What do you think?
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Old 2005-05-26, 02:52 AM
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Re: source question killers 2005-02-25.

i'd like to ask, how would you do a spectral analysis? i know how to get it that way, but what signs do you look for to see if it was from a lossy source? Thanks
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Old 2005-05-26, 04:17 AM
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Re: source question killers 2005-02-25.

Quote:
Originally Posted by brainysod
i'd like to ask, how would you do a spectral analysis? i know how to get it that way, but what signs do you look for to see if it was from a lossy source? Thanks
http://www.thetradersden.org/forums/...ead.php?t=4288

that should get ya started
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Old 2005-05-26, 04:25 AM
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Re: source question killers 2005-02-25.

Quote:
Originally Posted by range_hood
What makes me feel strange about this spectrals are the blocked out areas below the frequency cut off. Also there is no straight cut off.
i've run across a few FM broadcasts which had the same sharp line around 19kHz...unfortunately, its just the nature of broadcast technology at this point
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Old 2005-05-26, 04:28 AM
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Re: source question killers 2005-02-25.

for spotting MiniDisc & mp3'd recordings:
http://www.audiohub.org/get/fa/fa.htm
http://www.audiohub.org/get/fa/sa.htm
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  #12  
Old 2005-05-26, 01:24 PM
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Re: source question killers 2005-02-25.

Yep that sharp line at 19k gives it away as an FM.
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Old 2005-05-26, 02:04 PM
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Re: source question killers 2005-02-25.

Quote:
Originally Posted by AAR.oner
Thanks!
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Old 2005-05-26, 03:58 PM
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Re: source question killers 2005-02-25.

this is a little off topic.
Do you think the same as me (itīs an other source).
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Old 2005-05-26, 04:46 PM
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Re: source question killers 2005-02-25.

looks the same to me, lossy and all.

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