My general assumption was that you were using a cordless phone (one of the few remaining applications for an ATA that I see) or some who-knows-what mass manufactured device with bargain basement components.
You're working on an interesting configuration, that's for sure! On Sun, Apr 16, 2017 at 9:17 PM, Josh <jma...@hotmail.com> wrote: > I have old Western Electric analog phones that don't have any sort of > filters or hard limiting. I'd assume most cordless phones have ~8KHz sample > rates, however, but all modern analog phones I've used aren't hard limited. > With a cordless phone, there's a reason to do that (to make efficient use of > spectrum) but with an analog phone, it would only add unnecessary complexity > to the design. > > > See this frequency response from a recording I made from a Western Electric > analog telephone. The call was analog end to end through old > electromechanical telephone switching equipment that I mess with, and I > sampled at 22050Hz. A higher sample rate would have illustrated my point > better, but this what I had on hand. > > > http://imgur.com/a/FYTsO > > > I'm sure an IP phone will produce higher fidelity audio over any codec than > an analog phone, but improvement will definitely be noticed, at least by my > ears, using an "HD" codec with an analog phone such as a Western Electric > 2500 or 500 set. > > > Josh > > ________________________________ > From: David Kerr <da...@kerr.net> > Sent: Sunday, April 16, 2017 8:08 PM > > To: AstLinux Users Mailing List > Subject: Re: [Astlinux-users] Opus Codec Support > > I was about to reply to Josh with much the same comments... if the ultimate > device is an analog attached telephone then it is unnecessary and a complete > waste to bother with HD codecs. > > But in saying that, in the last year I have upgraded the equipment in my > house from ATA connected devices to pure VoIP (I went with one Yealink T46G > and five W52P's) which I connect with g722 codec and the difference in sound > quality is noticeable... especially if you can keep everything in the chain > HD. But even going out to a VoIP trunk that uses uLaw/aLaw ultimately to > e.g. my iPhone using VoLTE the quality is noticeable better... presumably > because there is no analog signal anywhere in the chain even though the > digital signal is downsampled as it goes through the trunk. > > Anyone know of a VoIP trunk vendor that will support HD voice codecs... and > keep HD through its paths if the other end also supports HD? > > David > > On Sun, Apr 16, 2017 at 4:13 PM, Kristian Kielhofner <k...@kriskinc.com> > wrote: >> >> Hi Josh, >> >> The availability of Opus on an ATA is a little strange because >> virtually any analog POTS device you connect to it will undoubtedly >> have filters and/or other hardware limitations in place for the 300 - >> 3300Hz frequency range supported by the PSTN. >> >> To support frequencies beyond the usual ~3 KHz frequency range of >> the PSTN you need different audio hardware to support the increased >> frequency range represented in sample rates greater than 8KHz (8-48KHz >> being supported by the Opus codec itself). >> >> Polycom and other handset manufacturers that support "wideband >> audio" made very noticeable changes to the audio components (the >> speakers and microphones of the handsets, speakerphones, etc) used >> with their devices. Hardware like mobile devices, desktops, etc using >> Opus with Chrome/WebRTC/etc tend to best support frequency ranges up >> to 48KHz even though it's well beyond the "standard" 20-20,000Hz range >> of most audio components and human hearing. >> >> In short, it's unlikely you'll gain any noticeable improvement in >> audio quality by using Opus with an ATA and depending on the analog >> device itself you may actually have worse audio quality due to >> clipping and all kinds of other strange things that could happen when >> an analog device designed for the PSTN of the last 100 years is >> connected to something that can sample audio well beyond anything the >> audio hardware itself was designed for. >> >> Here's a fun site that tests the range your audio hardware can >> produce (and what your ears can hear): >> >> http://onlinetonegenerator.com/hearingtest.html >> >> I'm 33 years old and my hearing tops out at about 15 KHz but for now >> I'll make myself feel better by blaming my cheap computer speakers ;)! >> >> On Sun, Apr 16, 2017 at 2:51 PM, Josh <jma...@hotmail.com> wrote: >> > I had read that the Asterisk 13 config changes were likely to affect >> > many >> > users, but that wasn't on my mind. Thanks for mentioning it! >> > >> > >> > Yeah, I'm not wild about the details of Opus either but it's the only >> > way I >> > can use "HD" voice with the hardware I've got, so I figure I'll give it >> > a >> > whirl pretty soon. I just bought some unlockable $10 Vonage-branded >> > Grandstream HT-802 ATAs which were too enticing to pass up! If you're >> > interested in messing with that, the details of the unlocking method are >> > available on page 2 of this thread: >> > >> > >> > >> > https://www.dslreports.com/forum/r30988922-Unlock-New-Grandstream-ATA-used-by-Vonage-Unlocked >> > >> > >> > It requires a serial cable with 3.3V logic and actually didn't even >> > require >> > soldering since you can easily stick individual pin headers in the three >> > appropriate holes (TX RX and GND). I'm comfortable with those methods >> > so >> > the actual process took me about 5 minutes, but reading the entire >> > thread >> > and digesting all of the information (which I've learned to do when >> > unlocking a device I don't want to accidentally brick) took considerably >> > longer. >> > >> > >> > Josh >> > >> > ________________________________ >> > From: Lonnie Abelbeck <li...@lonnie.abelbeck.com> >> > Sent: Sunday, April 16, 2017 11:42 AM >> > >> > To: AstLinux Users Mailing List >> > Subject: Re: [Astlinux-users] Opus Codec Support >> > >> > Josh, >> > >> > To be clear, upgrading the base system to Asterisk 13 is easy, but you >> > will >> > have to tweak your Asterisk configuration. >> > >> > This URL, at the end look for "Upgrade Note for Asterisk 11 -> 12" and >> > Upgrade Note for Asterisk 12 -> 13 ... >> > >> > Asterisk LTS Series Version >> > https://doc.astlinux-project.org/userdoc:tt_asterisk_upgrade_version >> > >> > If you built your own custom AstLinux image with Asterisk 13, you could >> > add >> > to a finished build the proper downloaded binary blobs from Digium >> > "format_ogg_opus.so" and "codec_opus.so" to their proper location at >> > output/target/usr/lib/asterisk/modules/ and quickly rebuild with >> > ./scripts/build . Never tried it, those Opus binary blobs send shivers >> > down >> > my spine. :-) >> > >> > Lonnie >> > >> > >> > On Apr 16, 2017, at 10:08 AM, Josh <jma...@hotmail.com> wrote: >> > >> >> Lonnie, >> >> >> >> Oops, I missed the previous discussion about Opus. Thanks for pointing >> >> me >> >> to it! I would really like to use Opus with Astlinux now that I have >> >> an >> >> HT802 ATA that supports it but not SILK (as well as people I call via >> >> SIP >> >> who use Opus). However, I was aware of the legal issues surrounding it >> >> so I >> >> had a hunch it might be a hassle to redistribute it with Astlinux. I >> >> guess >> >> I could roll my own Astlinux build with Opus support once you adopt >> >> 13.13 >> >> (which I believe is the first build that includes Opus in menuselect), >> >> right? >> >> >> >> The upgrade to 13 looks easy. Thanks for confirming! >> >> >> >> Josh >> >> >> >> From: Lonnie Abelbeck <li...@lonnie.abelbeck.com> >> >> Sent: Sunday, April 16, 2017 9:05 AM >> >> To: AstLinux Users Mailing List >> >> Subject: Re: [Astlinux-users] Opus Codec Support >> >> >> >> Hi Josh, (comments inline) >> >> >> >> On Apr 15, 2017, at 9:46 PM, Josh <jma...@hotmail.com> wrote: >> >> >> >> > Hello, >> >> > >> >> > Does the current Asterisk 13 version of Astlinux support the Opus >> >> > codec? >> >> >> >> No, Digium's Opus binary blob is not included, but the SILK CODEC is >> >> included. >> >> >> >> Here is a related mailing-list thread on the subject ... >> >> >> >> [Astlinux-users] Opus CODEC >> >> >> >> >> >> https://www.mail-archive.com/astlinux-users@lists.sourceforge.net/msg08638.html >> >> >> >> >> >> > Also, I'm currently running astlinux-1.2.8 i686 - Asterisk 11.23.1. >> >> > If >> >> > I want to upgrade to version 13, can I just change my repository URL >> >> > and do >> >> > a regular upgrade through the web GUI? >> >> >> >> Yes, exactly. >> >> >> >> Later, should you want to use Asterisk 11.25.1 instead, change your >> >> repository URL back to ast11, then System tab -> System Firmware >> >> Upgrade: [ >> >> Revert to Previous ] then [ Upgrade with New ] and lastly >> >> Reboot/Restart >> >> System. >> >> >> >> Lonnie >> >> >> >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> >> Check out the vibrant tech community on one of the world's most >> >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> >> _______________________________________________ >> >> Astlinux-users mailing list >> >> Astlinux-users@lists.sourceforge.net >> >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> > Astlinux-users Info Page - SourceForge >> > lists.sourceforge.net >> > Welcome to the AstLinux users mailing list! To see the collection of >> > prior >> > postings to the list, visit the Astlinux-users Archives. Using Astlinux >> > ... >> > >> >> Astlinux-users Info Page - SourceForge >> >> lists.sourceforge.net >> >> Welcome to the AstLinux users mailing list! To see the collection of >> >> prior >> >> postings to the list, visit the Astlinux-users Archives. Using Astlinux >> >> ... >> >> >> >> >> >> Donations to support AstLinux are graciously accepted via PayPal to >> >> pay...@krisk.org. >> >> >> >> >> >> ------------------------------------------------------------------------------ >> >> Check out the vibrant tech community on one of the world's most >> >> engaging tech sites, Slashdot.org! >> >> http://sdm.link/slashdot_______________________________________________ >> >> Astlinux-users mailing list >> >> Astlinux-users@lists.sourceforge.net >> >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> > Astlinux-users Info Page - SourceForge >> > lists.sourceforge.net >> > Welcome to the AstLinux users mailing list! To see the collection of >> > prior >> > postings to the list, visit the Astlinux-users Archives. Using Astlinux >> > ... >> > >> >> >> >> Donations to support AstLinux are graciously accepted via PayPal to >> >> pay...@krisk.org. >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > Check out the vibrant tech community on one of the world's most >> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> > _______________________________________________ >> > Astlinux-users mailing list >> > Astlinux-users@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/astlinux-users >> > Astlinux-users Info Page - SourceForge >> > lists.sourceforge.net >> > Welcome to the AstLinux users mailing list! To see the collection of >> > prior >> > postings to the list, visit the Astlinux-users Archives. Using Astlinux >> > ... >> > >> > >> > Donations to support AstLinux are graciously accepted via PayPal to >> > pay...@krisk.org. >> > >> > >> > ------------------------------------------------------------------------------ >> > Check out the vibrant tech community on one of the world's most >> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> > _______________________________________________ >> > Astlinux-users mailing list >> > Astlinux-users@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/astlinux-users >> > >> > Donations to support AstLinux are graciously accepted via PayPal to >> > pay...@krisk.org. >> >> >> >> -- >> Kristian Kielhofner >> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Astlinux-users mailing list >> Astlinux-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> >> Donations to support AstLinux are graciously accepted via PayPal to >> pay...@krisk.org. > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Astlinux-users mailing list > Astlinux-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > pay...@krisk.org. -- Kristian Kielhofner ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
