Started by LotharX, March 08, 2017, 12:21:13 PM
Quote from: LotharX on March 11, 2017, 09:24:45 AMThey said that some sort of wireless interference from some other device might make my OBi sound scratchy. I have a whole lot of electronic devices in my house, including a lot of WiFi-enabled home automation devices, so if that's the issue, it could be anything.
Quote from: LotharX on March 11, 2017, 12:41:42 PM@LTN1: I don't have an active POTS jack in my house, so unfortunately I can't try that either. That would have been a very useful test though.Your idea to try a 5.8 GHz phone is a good one, but I'd be concerned that that frequency band would interfere with my various 5 GHz WiFi devices, since the frequencies do overlap. A DECT 6.0 phone shouldn't conflict with any of my WiFi devices. Before I go out and buy yet another phone, which do you think would be a better next option, trying OBiTALK support's suggestion to try a VTECH phone (another DECT 6.0), or your suggestion to try a 5.8 GHz phone? Either way, I'm going to have to try to find a phone at some local store where I can return it, so my options may be limited.
Quote from: LTN1 on March 11, 2017, 12:59:16 PMIf you are going to the store to buy a phone for testing anyway, and if you are able to do so temporarily (1 day) on a credit card, why not buy both types of phones just to test? It doesn't have to be expensive...just cordless using those frequencies...a 5.8 and 1.9 GHz.Another thing you can do, if it is possible, to turn off every single electrical device (temporarily) except your modem and router, and see if that helps your current cordless. If it does, slowly turn on each off device--one at a time--and make calls each time--to see where the culprit is--if it is indeed one of them.
Quote from: SteveInWA on March 11, 2017, 03:58:15 PMSo, a "HD Audio" phone would not necessarily sound better, since it is limited to G.711, although it might have better quality audio amplifiers, microphones, speakers etc.
Quote from: Taoman on March 11, 2017, 04:17:59 PMQuote from: SteveInWA on March 11, 2017, 03:58:15 PMSo, a "HD Audio" phone would not necessarily sound better, since it is limited to G.711, although it might have better quality audio amplifiers, microphones, speakers etc.It's a gimmick. I've tried the phone. All "HD Audio" means, in this case, is preset equalizer settings. That's it.I've tested VTech, AT&T, and Panasonic DECT 6.0 phones. I always return to Panasonic.
Quote from: SteveInWA on March 11, 2017, 04:41:35 PMSo essentially, VTech is using a meaningless term, similar to calling a grocery product "all natural". Just to be clear, though, wideband audio, aka "HD Voice", in the telephone industry, usually means that the product supports one or more of the wideband audio CODECs (G722.2 AMR-WB and/or OPUS). The OBi IP phones do so, and the sound quality on a true wideband call (the entire path supports WB), sound fantastic compared to the typical narrowband call.Wikipedia has a good write-up here: https://en.wikipedia.org/wiki/Wideband_audio
Quote from: drgeoff on March 12, 2017, 04:11:22 PM@LotharX1. The Obi records incoming distant audio at a take-off point in the processing chain before the phone connection. That means the phone you use has minimal effect. It is only any sound picked up by its microphone and added in to the mix that affects the recording.2. Do you find any significant difference between the scratchiness when listening to a recording compared to the live version through the phone? Concentrate on the scratchiness because the tonal balance may be quite different between the speakers or headphones and your phone(s).
Quote from: LTN1 on March 12, 2017, 02:15:44 PMI downloaded your audio file, listened to it--then dialed the **9 to listen to the same exact OBi prompt. I can confirm that what I heard on your audio file was pretty close to what I heard in doing the **9 test on my own OBi202. The OBi prompt sounded like it was poorly recorded with some background line noise. The voice was OK...but it was over that background noise--somewhat like speaker phone background noise.The echo test itself, did not have the background noise. I then took my Uniden Dect 6 (1.9 Ghz of course) and made a call to 800-555-1212. The automated operator was clear but now I was listening for background noise when she didn't speak--and can confirm there is some line noise that could be heard if you listened carefully enough. I then went to an AT&T Dect 6 cordless and found it similar to the Uniden. Afterwards, I used a Uniden 2.4 GHz cordless and found a bit more line noise when there was silence--but of course, only because I was focused on looking for the "noise."I also tried a Uniden 5.8 GHz cordless, and it was similar to the Dect 6 phones...maybe a tad better.I also used a cheap backup pure landline analog phone and when looking to hear noise during the silence, I also found line noise--worse than the cordless.The clearest connections were from my corded IP Fortinet phone ($350 phone) (almost seems like it had line noise suppression between voices) and from my Verizon Dect 6 cordless phone connected directly to a landline--but of course, I could still find minute traces of background/line noise during the silence if I intently looked for it.I also found that depending on the phone number I called (assuming the calls were routed through different CLECs), certain connections were clearer and certain had more line noise.My tentative conclusions thus far are that some CLEC connections are clearer than others--and that is an additional layer of impact on the type of phone you are using--even if you are using the best phone possible. So a person may be calling from your area where the CLEC is using a less than premium line connection--which could impact your call quality. That same call, from another CLEC, in an area that uses a more premium line connection, could sound much better.I just had some time on Sunday to test these issues...but my testing is from a layman's (non tech professional) perspective. Someone like SteveInWA, a real tech professional, could clarify these things much better, besides correcting my misuse of these terms.
Quote from: drgeoff on March 13, 2017, 12:48:17 PMAttached recording made as follows:Olympus LS3 recorder with Sony ECM-TL02 microphone between my ear and earpiece in handset of Gigaset S445 DECT handset and base station. (Original European DECT system.) Recorder set to 44.1 kHz sampling, 16 bit PCM mono, manual level control and low cut filter off.DECT base connected to phone port of OBi110. OBi110 registered as an extension on my Asterisk PBX. Called my Callcentric number using GV trunk on Asterisk. Callcentric trunk on Asterisk brought the call back across the Atlantic to Asterisk which forwarded it to Lenny as a remote SIP extension.