source question killers 2005-02-25.

[range_hood]

I recorded this show by myself, so there´s 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?

[Ted]

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.

[range_hood]

Thanks Ted. I tried around and compared the cable broadcast to their terrestrial. They came out with similar spectrals.
I´ll try this again with a cast which I´m sure that it is live. (Bonus Track 00:00 tonight).

FM broadcasts are frequency limited. You are most likely seeing the effect of that.

[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.

[ssamadhi97]

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.

[range_hood]

This is a clip of a live cut of fm4 (terrestrial 103,8 MHz here in Vienna) from Bonustrack, you can call in there, it´s like talk radio. What do you think?

[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

[AAR.oner]

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

[AAR.oner]

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

[AAR.oner]

for spotting MiniDisc & mp3'd recordings:
http://www.audiohub.org/get/fa/fa.htm
http://www.audiohub.org/get/fa/sa.htm

[Rider]

Yep that sharp line at 19k gives it away as an FM.

[brainysod]

Originally Posted by AAR.oner

http://www.thetradersden.org/forums/...ead.php?t=4288

that should get ya started

Thanks!

[range_hood]

this is a little off topic.
Do you think the same as me (it´s an other source).

[Five]

looks the same to me, lossy and all.