Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 2   >   >>
MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/29/2013 4:32:21 PM
NO RATINGS
@David, that's why I keep POTS phones and dont go to VoIP with Comcast, no matter how many times the call trying to get me to sign up. My office phone is a voice phone running on my DSL service. At frst, it was unusable after a few minutes. the voice would break up. Changing modems has solved the problem.

David Ashton
User Rank
Blogger
Re: Sound Quality on Telephones
David Ashton   12/29/2013 3:00:55 PM
NO RATINGS
@MB I would wholeheartedly agree with you.  The silly thing is that POTS phones are still limited to around 3 to 4 KHz by the codecs, and they still sound great.  We recently swapped our good old TDM PABXs at work for a VOIP system.  It's good when it works, but we've had no end of niggly problems.  And guess what?  If your network connection is bad or down you have NO Comms at all!  No email, no phones, no IM, NOTHING!  Come back TDM/ISDN, all is forgiven!

MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/29/2013 11:45:27 AM
NO RATINGS
My nephew tried to connect using hiw Windows 8 computer and said it wouldn't connect. Itried with my Win7 and it found the devices but asked for drivers. I downloaded the drivers but because UBM won;t give me admin rights, I was unable to install. We have a fairly new Android tablet here and a phone so I'll try them.

AZskibum
User Rank
CEO
Re: Sound Quality on Telephones
AZskibum   12/29/2013 11:16:19 AM
NO RATINGS
I wonder if the BT-only-compatible-with-Apple is still true. This seems like it might be a leftover from the days when Android didn't support BT 4.0 (BT Low Energy). Those days were not that long ago, and millions of consumers are still using Android phones that don't support this.

MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/28/2013 9:41:16 PM
NO RATINGS
Today, I joined the crowd and bought a JBL Charge bluetooth speaker, a step up from the one shown above. It works fine with Apple devices and in fact, the box indicates that it's only Bluetooth compatible with Apple. Some of the reviews on Amazon point to that incompatibility fact; buyers didn't know that when they bought theirs.

JBL Bluetooth speaker connected to iPhone

MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/25/2013 11:17:46 AM
NO RATINGS
AP ran a story this week about the new popularity of speakers and audio for portable devices. But, this is for music, not for making phone calls.

Headphones, speakers top electronics gift lists

DrQuine
User Rank
CEO
Re: Sound Quality on Telephones
DrQuine   12/10/2013 8:31:42 PM
NO RATINGS
@JeffL_2 thanks so much for explaining that horrible sound that comes out of the phone when I'm on hold. Since so many of us spend so much time on hold, I'd think that the "on hold Muzak people" would select material that can tolerate the low bandwidth or provide some peaceful silence (with periodic confirmations that the line is alive).

MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/10/2013 2:54:42 PM
NO RATINGS
The next thing coming is voice over LTE, VoLTE. that will put the voice on the data network.

JeffL_2
User Rank
CEO
Re: Sound Quality on Telephones
JeffL_2   12/10/2013 12:01:49 PM
NO RATINGS
I'm not surprised that test equipment exists to measure this but I'm more than a little surprised that there's real popular concern. So many of these modern mobile links just "assume" that the traffic over a link is almost exclusively voice that these links automatically route all traffic through a vocoder path in order to reduce the data rate of the traffic. If you've ever waited on a cell phone for a long time for service (like for support for a federal or state program like benefits) you've noticed the absolutely abysmal quality of "music on hold", it sounds almost literally (to recycle a very old quote) "as if someone pushed the RCA pooch into the horn" (yes it was a joke on their old "his master's voice" logo). You get that hideous sound because the link is trying to "vocode" music (possibly an entire symphony orchestra) and pass it over a link at a few thousands bits per second! My goodness if people are willing to tolerate THAT annoying abuse (and you seldom hear anyone bring it up, although it happens literally all the time) it makes me wonder what the heck WOULD they be prepared to complain about??

MeasurementBlues
User Rank
Blogger
Re: Sound Quality on Telephones
MeasurementBlues   12/9/2013 10:24:21 PM
NO RATINGS
@DrQuine. Audio test of speakers and amplifiers in phones assumes a good quality signal. I think that the audio testing os more for music than telephone voice. Unfortunately, even a good quality audio subsystem is at the mercy of the cellular network. At this point, I think telephone service is assumed; the carriers and cell phone makers are more interested in the audio quality of music, movies, and games.

Page 1 / 2   >   >>


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
23 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...