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83 Comments
- P522, on 04/15/2008, -1/+33The HD in HD Radio stands for Hybrid Digital, not High Definition. There's nothing High Definition or enhanced quality coming out of a cheap HD radio.
- geoffhill, on 04/15/2008, -0/+23Now I can argue with my cable company with higher sound quality. Hurray.
- 1980Tim, on 04/15/2008, -1/+21The HD in "HD Radio" actually stands for Hybrid Digital not High Definition.
http://en.wikipedia.org/wiki/HD_Radio
Another example of a company using deceptive marketing to sell you an inferior product. - zoid, on 04/15/2008, -2/+21Many audiophiles will argue that analog is higher quality.
- RealmDown, on 04/15/2008, -0/+15Most audiophiles just like to argue.
- ErikHarrison, on 04/15/2008, -6/+20STOP MISAPPROPRIATING BANDWIDTH. I can hear my wife bitching just fine on the phone I have now.
- mjerris, on 04/15/2008, -0/+14Typical phone circuits only pass audio in the 300 to 3400 Hz range, wideband digital audio covers 50 to 7000 Hz. This is a significant difference for example in telling the difference between an "S" and a "F" when spelling something on the phone. You can also increase clarity via higher sample rates. This is not just a matter of interference, this is how much of the audio data you are reproducing vs. what the human ear can detect.
- briankwest, on 04/15/2008, -0/+12Higher quality than 8kHz that normal phones run at. 16kHz does sound much better!
- marksism, on 04/15/2008, -3/+14My dictionary is high in definitions
- Spuy767, on 04/15/2008, -2/+11I think that HD is the new buzz word for the entire word, I swear to go I've seen every thing termed HD. I know I've seen HD sunglasses at the store, and I've probably seen HD microwaveable pizza. I've seriously had enough of that term.
- briankwest, on 04/15/2008, -0/+9Same here. Anthony did know that it means Hybrid Digital... But everyone thinks it means High Def.
- TRScheel, on 04/15/2008, -1/+10High Definition pizza... now that I gotta see
- derek4iax2, on 04/15/2008, -0/+8Yep. Some of them will argue that valve amplifiers give even better quality.
However, 16khz does sound much better than 8khz. - tarmithius, on 04/15/2008, -1/+9So true, I cringe every time someone asks me if it means High Def.
- protogenxl, on 04/15/2008, -0/+6What happened to ISDN lines?
- tuxidomasx, on 04/15/2008, -0/+6Customer Service: Every item on your bill iff sinal and cannot be taken off.
Me:What? What the SUCK is this FHIT on my bill?!? I didn't order thif!
yup. HD might be worth it. - RustyJ, on 04/15/2008, -3/+9There is no such thing as high definition audio, just audio without interference/immaculate mixing. By that logic, XM and Sirius are both "HD radio" as they do not have any FM static. Don't let the salesman suck you into the High-Def Hype
- scubajim, on 04/15/2008, -0/+6Actually the band with is 3kHz from 300 hz to 3300 Hz which is why s's and F's are difficult to distinguish.
- veloscaper, on 04/15/2008, -0/+5frequency range and sample rates are not the same thing.
- nekochan, on 04/15/2008, -1/+6just buy pizza from a local business instead of pizza hut. the colors and flavors will pop.
- mjerris, on 04/15/2008, -0/+5If you want to try this out for yourself, download a free client like x-lite set it for just speex wideband and try calling sip:1616@conference.freeswitch.org with a friend, use a headset, because the comment about background noise is valid. Its one of those things that you need to hear the difference to understand.
- FuzzyCat, on 04/15/2008, -0/+5
It's all marketing - Even Tom Tom are using the term to try to sell more navigation kit. HD-Traffic.. WTF .... - ken0624700, on 04/15/2008, -2/+7actually analog is always higher quality than digital - once you start digitizing an analog signal by sampling it, you lose quality.
- kymike, on 04/15/2008, -1/+6Why did the lead-in say "Ignore some of the FreeSwitch-promotion"? I read the whole article, and it didn't sound very self-promoting to me...
Anyway, and more on-topic: Screw HD-audio. What I want, more than anything (phone-related) is LOWER LATENCY on my cell phone. I can't stand the delay between one side talking and the other side hearing - I'm guessing the latency is on the order of 100 to 200 milliseconds (AT&T Wireless). It is especially bad when both sides are using cell phones. - madeingermany, on 04/15/2008, -1/+6Listen to any (properly recorded) podcast that has somebody dialing in and you will know the difference there.
Our company went to IP phones - still the sound quality is not nearly what it could be and don't get me started on those miserable cell phone calls... - loneBoat, on 04/15/2008, -1/+5This is a High-Definition comment. See how clear it is?
Now compare it to a Standard Definition comment:
Ron Paul FTW! You, sir, win at Internet tubes. I like XKCD! OMG, neocons R crazy!
See how unclear it is? Digg needs to implement HD comments. - briankwest, on 04/15/2008, -1/+5Not only that but they can tell the F from the S really clearly. So your curse words will make it thru in stunning quality.
/b - mjerris, on 04/15/2008, -0/+4Also, more recent nokia handsets support AMR wideband over voip, the issue is the underlying telephone networks don't support it. With the emergence of voip/mobile convergence, you can expect to see more services like this available to the average consumer.
- Woecip, on 04/15/2008, -0/+4So everyone changes to VOIP teles as opposed to POTS lines , which by doing so degrades the voice quality due to the current problems with VOIP. Now they offer HD service to improve the quality they screwed up in the first place? Ugh.
- briankwest, on 04/15/2008, -0/+4What is nice is G.722 is free and uses the exact same bandwidth G.711 does. So 16kHz at 8kHz prices in terms of bandwidth.
Oh and FreeSWITCH comes with G.722!
/b - briankwest, on 04/15/2008, -0/+4You can Thank Polycom for that they started the HD-Voice in their products.
/b - fxu1989, on 04/15/2008, -2/+6Next to come: HD-Microwave
- hamdevguru, on 04/15/2008, -0/+3BT have been doing it for a while on some devices: http://bt.custhelp.com/cgi-bin/bt.cfg/php/enduser/ ...
There used to be a more detailed site about it but I can't find it anymore. - briankwest, on 04/15/2008, -1/+4G.722 isn't to be confused with G.722.1 or anything else with a dot in it. G722 is light on CPU and isn't expensive to utilize or maintain.
/b - briankwest, on 04/15/2008, -1/+4They can't help it stupid people fall for it.
/b - briankwest, on 04/15/2008, -0/+3That is true. Thats the point of 16k and 32k voip. Its something you use in groups to collaborate and communicate. Its great for business environments where you need to make sure you understand fully what is going on.
/b - mjerris, on 04/15/2008, -0/+3For what it's worth, the g722 codec uses the same amount of bandwidth for wideband as g711 does for narrow band. On the other hand, it does a better job at transmitting higher frequency ranges of upset spouses or complaining children. The good news is, its not generally available at home, typically more on commercial pbx devices and voip.
- anthm, on 04/15/2008, -0/+3Yes, HD-Telephony is the term given by the industry to describe 16khz audio used in place of 8khz in a telephone. It's actually a higher sampling rate meaning there is more information from your voice so it's a more accurate representation. So it's not a better presentation of the audio it's a more detailed presentation. Such as the difference between a millions of colors tiff image and the same image reduced to a 256 color gif.
- raynevandunem, on 04/15/2008, -0/+3Wouldn't HD comments have larger (I mean, gratuitously large) text sizes and fonts, as I've seen on some web designers' blogs?
Oh....that's probably Web 2.0 comments. My bad. - anthm, on 04/15/2008, -0/+3Yes, that's what the article is all about. Hence the title =D
- anthm, on 04/15/2008, -0/+3That's true,
When sending a call to gateway to the PSTN it's pointless to establish a 16khz call.
If you are going to terminate to another 16khz termination point such as another phone or a conference then it's ideal. - anthm, on 04/15/2008, -0/+3We're working on that too actually. An open source ISDN stack that if it was point to point could use the g722 codec which was designed by the ITU to do 16khz audio and take the same bandwidth of a standard 64kbps digital channel.
- Timmmm, on 04/15/2008, -1/+4Yeah that's *****. Phones are narrow-band. Think about it! If you connected a CD played through a phone (directly - not via a microphone) and then into a nice hi-fi on the other end it would still sound *****.
- bdbr, on 04/15/2008, -0/+3I don't know what was wrong with the term "wideband" - why do they feel the need to change it to HD-telephony?
This is only useful if you have a specific group of people who call each other on a specific set of devices. If they ever call to/from a regular phone, no wideband codec can be used. My company did a trial and it sounded great on those rare occasions that they called each other.
BTW, the GIPS codecs used by Skype support wideband audio. A lot of people like the quality of Skype-to-Skype calls. If your call is to/from a regular phone, the narrow-band G.729 codec will be used. - macslut, on 04/15/2008, -1/+4I Still Don't kNow.
Actually, cable and DSL pretty much killed ISDN. - dforce, on 04/15/2008, -0/+3The Polycom SIP phones that have 'HD Voice' sound incredible over a hosted PBX - like the person is sitting in the room talking to you
- RustyJ, on 04/15/2008, -2/+5that's because there's zero latency. It is superior. However, it's also impossibly expensive to utilize and maintain.
- Leomarth, on 04/15/2008, -0/+2@veloscaper
Right. Nyquist's law says your sampling rate should be at least 2x your maximum frequency. - Leomarth, on 04/15/2008, -0/+2Well, technically the area the size of your thumb at arms length is your "high definition" area. The rest gets kind of fuzzy.
- anthm, on 04/15/2008, -0/+2uncompressed audio at 16khz may be that speed but the ITU standard G722 codec which is freely downloadable uses just 64kbps, the same as standard G711 ulaw or alaw which is the default PSTN and ISDN codec.
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