On 1/6/14 9:44 PM, Magnus Danielson wrote:
Jim,
On 07/01/14 05:43, Jim Lux wrote:
On 1/6/14 8:36 PM, Magnus Danielson wrote:
Bob,
It works the other way around. The standard Bell handset (103A I believe
the designation was) has the 300-3400 Hz response, and with not so fancy
analogue
I should have commented on this earlier. I have lost track of who said,
when the guy at the station talks, there are strong components below
100Hz.
This was in reference to call in talk shows. The guy at the station is
speaking into a regular broadcast quality microphone. The microphone
-nuts@febo.com
Sent: Sunday, January 5, 2014 1:53 PM
Subject: Re: [time-nuts] WWV/WWVH audio simulator?
This is by design
The POTS (Plain Old Telephone System) specifies a bandwidth of 300Hz to
3,400Hz.
http://en.wikipedia.org/wiki/Plain_old_telephone_service
They are trying to cram as many
On 1/6/14 8:36 PM, Magnus Danielson wrote:
Bob,
It works the other way around. The standard Bell handset (103A I believe
the designation was) has the 300-3400 Hz response, and with not so fancy
analogue filtering, you can handle 4 kHz and thus 8 kHz sampling rate.
The ITU-T G.711 A-law (where
-nuts@febo.com
Sent: Sunday, January 5, 2014 1:53 PM
Subject: Re: [time-nuts] WWV/WWVH audio simulator?
This is by design
The POTS (Plain Old Telephone System) specifies a bandwidth of 300Hz to
3,400Hz.
http://en.wikipedia.org/wiki/Plain_old_telephone_service
They are trying to cram as many
Jim,
On 07/01/14 05:43, Jim Lux wrote:
On 1/6/14 8:36 PM, Magnus Danielson wrote:
Bob,
It works the other way around. The standard Bell handset (103A I believe
the designation was) has the 300-3400 Hz response, and with not so fancy
analogue filtering, you can handle 4 kHz and thus 8 kHz
On 07/01/14 05:53, Tom Minnis wrote:
I believe the Western Electric D1 channel bank was the first and the
European standard came along later. Then came the D2, the D3 and
finally the D4 when integrated codecs finally came to be and it was
practical to get rid of the common codec and do it
No, that's not it. It's a design-by-committee thing. As I recall it, the
Europeans wanted a 32 byte payload, as then you throw in a 32-byte E1 into
it, but this was judged to small for datacom which the North American side
wanted, that wanted a 64 byte payload.
Thanks. I hadn't heard the
Hi,
Wow, those recordings are very interesting! Late in that series, there's
one which sounds like a direct feed of WWVH for a few minutes. This
really points out what all is lost by the time the signal gets to air.
The phone services aren't much better, since everything above 4KHZ is
lost,
Replicating the WWV/WWVB audio is impractical given the various
weather and other timely messages.
One could use the Linux festival voice syntheses package, which gives
a choice of voices.
On 01/05/2014 07:50 AM, Jayson Smith wrote:
Hi,
Wow, those recordings are very interesting! Late in
Of Jayson Smith
Sent: Sunday, January 05, 2014 07:51
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWV/WWVH audio simulator?
Hi,
Wow, those recordings are very interesting! Late in that
series, there's
one which sounds like a direct feed of WWVH
measurement'
time-nuts@febo.com
Sent: Sunday, January 5, 2014 1:53 PM
Subject: Re: [time-nuts] WWV/WWVH audio simulator?
This is by design
The POTS (Plain Old Telephone System) specifies a bandwidth of 300Hz to
3,400Hz.
http://en.wikipedia.org/wiki/Plain_old_telephone_service
They are trying
and frequency measurement
Subject: Re: [time-nuts] WWV/WWVH audio simulator?
The US POTS is digitized at 8KHz sample rate, so Nyquist says
the highest frequency you can accurately digitize is 4KHz.
Allow some for a (fancy digital) filter and 3400Hz is about
the best you can expect. As for T1
Hi Jayson,
You may already be aware of it, but there's a set of historical recordings
of WWV and WWVH, covering 1955 to 2005:
http://www.myke.me/atthetone/
As for the simulation, I'm sure it would be easy to do the tones and
clicks, but the voice announcements would need a considerable amount
Two ideas (1) buy a WWV receiver or (2) I'm sure Windows must come with
something like Apple's Garage Band (I don't know about Windows) but use
that to compose a sound that plays in an endless loop. Likely you'd use
one of the drum machines. Basically I'm saying yu can treat it as music
and
Jayson,
I chuckle because WWV is my favorite radio station also.
Why not tune it in on a good day and record the audio? Then you can digitize
it on the computer and have a .WAV file which you can play any time.
Trouble is, if you have recorded the announcements, you won't have the correct
On Fri, Jan 3, 2014 at 12:09 PM, Bob Albert bob91...@yahoo.com wrote:
Jayson,
I chuckle because WWV is my favorite radio station also.
Why not tune it in on a good day and record the audio? Then you can
digitize it on the computer and have a .WAV file which you can play any
time.
I have played WWV or CHU when I want to know the time but not be
bothered by extraneous sounds.
I live in Michigan, USA. When I built my first homebrew RF spectrum
analyzer
I found that I had to spend a week stopping CHU and another local AM station
from coming in on the power line.
A cheap
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