Audio streaming though Internet

[Osvaldo de Banfield]

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.

 

[phofman]

Typically mp3 128kbps.

 

[Osvaldo de Banfield]

I refer to the audio once decodified (recovered). Thanks.

 

[Osvaldo de Banfield]

And? Any other idea?

 

[Jepalan]

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.

 

[dangus]

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.

 

[Osvaldo de Banfield]

Interesting answers. many thanks to both guy's. I'll follow the link to learn some more things.