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Pat
Guest
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 Posted:
Thu Oct 27, 2005 4:35 pm Post subject:
Comment on this TV auto volume device? |
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http://www.tvsoundregulator.com/index.html
It seems a bit too good to be true (like those aerials you glue inside your cellphone?)
Anyone any experience of these?
Are there other brands?
Should it be cheaper?
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Richard
Guest
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| Posted:
Fri Oct 28, 2005 12:35 am Post subject:
Re: Comment on this TV auto volume device? |
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"Pat" <pat@usenet-only.com> wrote in message
news:4360ff69$0$49798$ed2e19e4@ptn-nntp-reader04.plus.net...
| Quote: | http://www.tvsoundregulator.com/index.html
It seems a bit too good to be true (like those aerials you glue inside
your cellphone?)
Anyone any experience of these?
Are there other brands?
Should it be cheaper?
|
Not really much info on their site. They claim it is patented technology,
but no link or info. Two output impedance listings; one in mV?? Aligns the
audio and video signal for perfectly synchronized picture and sound--what do
they think your TV is, a VCR? I especially liked the statement that it is
great for the hearing impared - that is what the volume control and/or
hearing aid are for. Funny, I never learned that the audio was part of the
composite video; part of the RF signal, yes. If they are separately messing
with the left and right channels ("for true stereo sound"), they will likely
screw up real stereo sound. I am real glad the response time is fast enough
for the really fast listeners - 2 microseconds!
Philips, among others, has had some deriviative of smart sound for years.
Even cable boxes tried to get in on the act, but some of those bomed. I
recall on older Cox box that automatically raised and lowered the volume.
However, it raised it really high during silence, so it blasted you out of
the room when the noise started.
<Editorial>Might be better to be fast-fingered on the remote - either volume
or mute (my favorite commercial button). Of course, I only watch about 6
hours of TV a week, and I only truly enjoy about two of that. Too much
garbage on the screen - graphics about what you are watching, what is coming
on next, what will be on tomorrow, weather, and the station and network
logos. Not much room left for the show.(/Editorial>
I'd be willing to bet it doesn't works nearly as well as the site states.
However, if they want to send you one to review (for free, of course), the
unbiased opinion of someone who has actually used one would be nice.
Richard |
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JeffM
Guest
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| Posted:
Fri Oct 28, 2005 12:35 am Post subject:
Re: Comment on this TV auto volume device? |
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| Quote: | http://www.tvsoundregulator.com/index.html
It seems a bit too good to be true
(like those aerials you glue inside your cellphone?)
Pat
|
Automatic Gain Control (compression) is nothing new.
With modular entertainment systems becoming more popular,
this seems like a natural offering.
It appears to go between the TV and an external sound system
and you mute the speaker in the TV.
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Ian Malcolm
Guest
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| Posted:
Mon Oct 31, 2005 1:35 am Post subject:
Re: Comment on this TV auto volume device? |
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JeffM wrote:
| Quote: | http://www.tvsoundregulator.com/index.html
It seems a bit too good to be true
(like those aerials you glue inside your cellphone?)
Pat
Automatic Gain Control (compression) is nothing new.
With modular entertainment systems becoming more popular,
this seems like a natural offering.
It appears to go between the TV and an external sound system
and you mute the speaker in the TV.
The specifications are bulls**t, The response time of 2 uS is |
ridiculous for a frequency response down to 20 Hz! I wonder if its even
got any active circuit in it. It doesn't mention ANYTHING about a power
supply or battery. If it hasn't got one, then the only approch I can
imagine actually working is a LED driven off the signal illuminating an
ORP12 in an attenuator circuit.
If you want an interesting project, Sample the sound output with a
microphone at the speaker. compare with your desired level and generate
Vol + or Vol - signals to send to the TV via an IR LED.
--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- &
[dot]=.
*Warning* SPAM TRAP set in header, Use email address in sig. if you must. |
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Jasen Betts
Guest
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| Posted:
Mon Oct 31, 2005 9:35 am Post subject:
Re: Comment on this TV auto volume device? |
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On 2005-10-27, Richard <richard_s633@cox.net> wrote:
| Quote: |
"Pat" <pat@usenet-only.com> wrote in message
news:4360ff69$0$49798$ed2e19e4@ptn-nntp-reader04.plus.net...
http://www.tvsoundregulator.com/index.html
It seems a bit too good to be true (like those aerials you glue inside
your cellphone?)
Anyone any experience of these?
Are there other brands?
Should it be cheaper?
|
| Quote: | I never learned that the audio was part of the
composite video; part of the RF signal, yes. If they are separately messing
with the left and right channels ("for true stereo sound"), they will likely
screw up real stereo sound. I am real glad the response time is fast enough
for the really fast listeners - 2 microseconds!
|
when you demodulste antenna signal you out the baseband video signal
and the sound signal FM modulated a few MHZ (precice value differing with
different video standards)
NICAM otoh is transmitted in the video band during the horiozontal blanking
period...
| Quote: | I'd be willing to bet it doesn't works nearly as well as the site states.
However, if they want to send you one to review (for free, of course), the
unbiased opinion of someone who has actually used one would be nice.
|
once the advertisers figure out how it works they'll find a way to defeat it.
Bye.
Jasen |
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Paul Perry
Joined: 12 Nov 2005
Posts: 4
Location: Melbourne Australia
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| Posted:
Sat Nov 12, 2005 1:41 pm Post subject:
re:Comment on this TV auto volume device? |
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If you record audio from a TV & look at the envelope of the signal, you will see that the peak signal levels during the program is the same as durin the commercials. But, during the commercials, the signal is heavily compressed, to put more average audio power in.
So what I think may be happening here, is the TV audio is being compressed ALL the time (makes no difference to the commercials, but brings up quiet passages in the normal priogram material). this enables the volume level setting to be backed off & the commercials no longer appear relatively loud.
I feel sorry for anyone who owns a TV though. |
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JeffM
Guest
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Paul Perry
Joined: 12 Nov 2005
Posts: 4
Location: Melbourne Australia
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| Posted:
Sun Nov 13, 2005 5:55 am Post subject:
Re: re:Comment on this TV auto volume device? |
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| JeffM wrote: | Paul Perry wrote (WITHOUT CONTEXT):
| Quote: | If you record audio from a TV...
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I notice that you're relatively new to Usenet.
Folks on Usenet like to see a bit of the previous post
included with (actually, above) the text of your post.
This is called **context**.
If you observe how most folks post, you'll see what I mean.
Most newsreaders blockquote the entire previous post for you
so that you can easily snip out those portions which don't apply,
leaving just enough to give context to your addition..) |
Ah, my apologies! I'm posting at http://www.electronicshelp.net
and had no idea this was related in any way to Usenet. Obviously I have
much to learn. In other places, I've been abused for quoting! |
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JeffM
Guest
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