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Old 27th August 2013, 04:38 PM   #1
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Default Audio streaming though Internet

Do anybody knows which is the dynamic range, S/N ratio and the BW of the radios through Internet (Like di.fm)? Only a curiosity.
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Old 27th August 2013, 04:49 PM   #2
phofman is offline phofman  Czech Republic
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Typically mp3 128kbps.
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Old 27th August 2013, 05:00 PM   #3
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I refer to the audio once decodified (recovered). Thanks.
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Old 29th August 2013, 03:10 PM   #4
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And? Any other idea?
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Old 29th August 2013, 03:25 PM   #5
Jepalan is offline Jepalan  United States
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There is not an easy answer to your question. The amount of compression applied to the audio by the streaming radio station will limit the dynamic range and frequency response of the audio you receive and "decode". The type of CODEC used will have an impact as well.

The compression process is going to limit the frequency response of the "decodified" audio. For example, an MP3 stream at 128KHz is going to have a rapid high frequency roll-off at 16Khz. See this link... MP3' Tech - An Examination Of The Correlation Between Perceived Sound Quality And Frequency Response Of Current MPEG Audio Encoders

Some radio streams are 96, 64 or even 24Kbps, which will roll off the high frequencies much sooner.
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Old 1st September 2013, 02:34 AM   #6
dangus is offline dangus  Canada
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The problem with S/N is that the MP3 encoding will tend to discard the noise if it is masked by louder signals. Conventional measurements aren't as useful for describing audio that's transmitted using lossy codecs. A single sine wave could be transmitted with extremely high fidelity at a bit rate that would be unacceptable for music.

Internet stations vary. Some stations deliberately keep bitrates as low as possible so as not to discourage mobile users who are charged for data usage (25 Mb/hour at TheHouse.FM); others are 256k (Citr.ca) which sounds very tolerable.
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Old 2nd September 2013, 12:27 PM   #7
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Interesting answers. many thanks to both guy's. I'll follow the link to learn some more things.
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