Voz sobre IP High Quality

Polycom HDMe hizo gracia la primera vez que lo ví con el logotipo HD ese de las plantallas de plasma, en un teléfono IP.

Me puse a investigar qué traía de High Definition que no trajeran otros y la respuesta fue sublime:

«Is HD VOIP something that consumers should consider when choosing a VOIP service, or is it more marketing lingo to work through?,» she writes. «As I understand it, HD, high definition, or wideband VOIP refers to voice sampling at 16 kHz rather than at the measley 8 kHz supported by the PSTN and just about everyone else. If you capture voice with a wider spectrum of frequencies, the quality is better.»

«Sounds good to me, but the catch is you have to have HD end to end in a VOIP call. It’s no good having 16 kHz at one end and 8 kHz at the other. In fact, 16 kHz downsampled to 8 kHz (which happens if you are calling a landline) may sound worse than 8 kHz from start to finish.So I guess you can make the argument that HD or wideband VOIP is wasted on the masses when most calls travel partially over the PSTN or use VOIP networks using an 8 kHz voice capture process.»

Enlace: http://www.polycom.com/solutions/1,1694,pw-17155,00.html?trackID=17155&track=pwHome

Enlace: http://blogs.zdnet.com/ip-telephony/?p=1427

Lo que está claro es que tardará algún tiempo en que veamos un VideoTeléfono barato con HD. 🙂

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