Anyone for Mux?

[Paul Burridge]

Hi,

In multiplex comms systems, what's the minimum sampling percentage of
plain speech necessary to make it intelligible at the other end?

Thanks,

p.
--

"What is now proved was once only imagin'd." - William Blake, 1793.

 

[Clarence]

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:RFsqd.26207$zx1.2176@newssvr13.news.prodigy.com...

Hi Paul,

In multiplex comms systems, what's the minimum sampling percentage of
plain speech necessary to make it intelligible at the other end?

8K samples of 2 bits will give reasonable speech. As little as 8K sample of one
bit will work, but gets pretty rough. Lower sample rates will work, but limit
the band width even more than fewer bits. Normal (ISDN) digital phones use
64Kb/sec.

 

[Charles Schuler]

My age is 63 and I find cell phones dicey, at best. Hearing tests show me
to be sort of average in acuity for my age. However, there are "notched
frequencies" that vary from one individual to another. Those darned hairs
in the transducer in our inner ear are sharply tuned! I'm guessing the
current number of bits is OK, but a higher sampling rate is in order. I'd
think a user boost in the frequencies around 2 to 3 kHz might be very
helpful for older folks.

 

[Joerg]

Hi Chris,

Yeah, cell phones really rot, IMHO. There might be a market for
"medium-fi" cell phones doing a solid 8ksps * 8bits.

I believe it has gotten worse over the last few years. I used to never
have any problems understanding someone on a cell phone or even
recognizing the voice. Nowadays, when someone doesn't start with their
name but says "Hello Joerg" I often have to ask back "Who is it?".

Oh what the heck, let's start a 48ksps * 16 bits stereo cell phone
network!

Or three different plans. Basic: You'll be able to notice that someone
is telling you something. Intermediate: Your can understand more than
50% or your money back. Premium: You can actually experience the voice
quality of a land line. Say, for just $9.95 more a month...

Just FYI: Your email address shows up non-munged at the bottom of your posts. That could invite spam crawlers to pick it up.


Regards, Joerg

http://www.analogconsultants.com

 

[Paul Burridge]

On Wed, 1 Dec 2004 17:48:07 -0500, "Charles Schuler"
<charleschuler@comcast.net> wrote:

My age is 63 and I find cell phones dicey, at best. Hearing tests show me
to be sort of average in acuity for my age. However, there are "notched
frequencies" that vary from one individual to another. Those darned hairs
in the transducer in our inner ear are sharply tuned! I'm guessing the
current number of bits is OK, but a higher sampling rate is in order. I'd
think a user boost in the frequencies around 2 to 3 kHz might be very
helpful for older folks.

Cheer up, Charles. You may not be able to hear what your interlocutor
is saying, but you'll be able to see him/her in much finer detail. All
the extra available bandwidth is going into the video side of it! :-/
--

"What is now proved was once only imagin'd." - William Blake, 1793.

 

[Charles Schuler]

Cheer up, Charles. You may not be able to hear what your interlocutor
is saying, but you'll be able to see him/her in much finer detail. All
the extra available bandwidth is going into the video side of it! :-/
--

Yeah, well I've known for several years now that most markets are driven by
youth and that youth is wasted on the young. Cheers.