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Radio delay to sync with TV video

Ok, posted in electronics.basics but no response:

Anybody have a simple circut to do this?

I love listening to our local radio announcers for the game while
watching the video. However, the radio broadcast is a good 4-5 seconds
before the HDTV video.


So I want to delay a radio broadcast by 4-5 seconds. I would imagine I
would run the tape out to the delay unit, back into the tape in, and
listen in a monitor mode. A pot that would allow me to change the dlay
from, say, 0-10 seconds would be beneficial.

Thx!
 
M

martin griffith

Jan 1, 1970
0
On 21 Dec 2004 04:57:21 -0800, in sci.electronics.design
Ok, posted in electronics.basics but no response:

Anybody have a simple circut to do this?

I love listening to our local radio announcers for the game while
watching the video. However, the radio broadcast is a good 4-5 seconds
before the HDTV video.


So I want to delay a radio broadcast by 4-5 seconds. I would imagine I
would run the tape out to the delay unit, back into the tape in, and
listen in a monitor mode. A pot that would allow me to change the dlay
from, say, 0-10 seconds would be beneficial.

Thx!
Its expensive
http://www.hhb.co.uk/hhb/uk/products/detail.asp?ID=860

but you could diy with a audio ADC, big chunk of 16bit memory, a few
counters and audio DAC.
Not a beginners project



martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
M

martin griffith

Jan 1, 1970
0
= PC + soundcard + software

The hardware is trivial, but the software is not a beginners project.

Regards,
Allan
DOH, why didnt I think of that!


martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
M

martin griffith

Jan 1, 1970
0
On 21 Dec 2004 04:57:21 -0800, in sci.electronics.design
Ok, posted in electronics.basics but no response:

Anybody have a simple circut to do this?

I love listening to our local radio announcers for the game while
watching the video. However, the radio broadcast is a good 4-5 seconds
before the HDTV video.


So I want to delay a radio broadcast by 4-5 seconds. I would imagine I
would run the tape out to the delay unit, back into the tape in, and
listen in a monitor mode. A pot that would allow me to change the dlay
from, say, 0-10 seconds would be beneficial.

Thx!
following Allans post
http://www.hitsquad.com/smm/win95/EFFECTS_DELAY_ECHO/
might be worth browsing


martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
D

Don Lancaster

Jan 1, 1970
0
Ok, posted in electronics.basics but no response:

Anybody have a simple circut to do this?

I love listening to our local radio announcers for the game while
watching the video. However, the radio broadcast is a good 4-5 seconds
before the HDTV video.

So I want to delay a radio broadcast by 4-5 seconds. I would imagine I
would run the tape out to the delay unit, back into the tape in, and
listen in a monitor mode. A pot that would allow me to change the dlay
from, say, 0-10 seconds would be beneficial.

Thx!

Just use a long piece of coaxial cable.
0.7 nanoseconds per foot.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
J

Jim Backus

Jan 1, 1970
0
Just use a long piece of coaxial cable.
0.7 nanoseconds per foot.

storing the 1,227,600 miles of cable might be a problem though!
 
T

Tam/WB2TT

Jan 1, 1970
0
Ok, posted in electronics.basics but no response:

Anybody have a simple circut to do this?

I love listening to our local radio announcers for the game while
watching the video. However, the radio broadcast is a good 4-5 seconds
before the HDTV video.


So I want to delay a radio broadcast by 4-5 seconds. I would imagine I
would run the tape out to the delay unit, back into the tape in, and
listen in a monitor mode. A pot that would allow me to change the dlay
from, say, 0-10 seconds would be beneficial.

Thx!
Tape loop should work, but you adjust the delay by changing the spacing
between the heads. I don't remember what the cassette tape speed is, but
around 1 ips. So, the spacing would have to be around 4 - 5 inches.

You could do it electronically with an A/D, D/A converters and some storage.
For 20 KHz sampling rate you would need 80 - 100 Kwords of storage. Probably
easier to do it in hardware than sticking a micro in it. Essentially a FIFO,
where you write in and read out with the same clock, but you don't start
reading out until the desired number of samples have been stored.

Tam
 
T

Tim Wescott

Jan 1, 1970
0
Jim said:
storing the 1,227,600 miles of cable might be a problem though!
Making an analog audio delay line with a bunch of caps and coils might
be fun, though.
 
J

Jim Thompson

Jan 1, 1970
0
Making an analog audio delay line with a bunch of caps and coils might
be fun, though.

When I was a student at MIT we had some special coax in the
Transmission Lines Lab. Its center conductor was a coil so that the
effective inductance per foot was quite large. I can't quite recall
now, but I believe it may have had a delay of about 100uS per foot,
making delay experiments into non-matched loads a piece-a-cake.

...Jim Thompson
 
T

Tim Wescott

Jan 1, 1970
0
Jim said:
When I was a student at MIT we had some special coax in the
Transmission Lines Lab. Its center conductor was a coil so that the
effective inductance per foot was quite large. I can't quite recall
now, but I believe it may have had a delay of about 100uS per foot,
making delay experiments into non-matched loads a piece-a-cake.

...Jim Thompson

The only MIT grad that I knew told me they always looked forward to
playing against WPI, because then they could get there scoring equipment
fixed by people who could actually recognize a soldering iron.

Was that the case when you were there?
 
J

Jim Thompson

Jan 1, 1970
0
The only MIT grad that I knew told me they always looked forward to
playing against WPI, because then they could get there scoring equipment
fixed by people who could actually recognize a soldering iron.

Was that the case when you were there?

I had a full scholarship covering tuition and books. But I had to
cover room and board. So I worked as a technician in Building 20 (but
I already had some experience... my dad had a radio/TV repair shop and
a hardware store.

But most everyone I hung out with at the very least built their own
kits. (Except for the PhD's who needed help wiping ;-)

...Jim Thompson
 
Tam/WB2TT said:
Tape loop should work, but you adjust the delay by changing the spacing
between the heads. I don't remember what the cassette tape speed is, but
around 1 ips. So, the spacing would have to be around 4 - 5 inches.

You could do it electronically with an A/D, D/A converters and some storage.
For 20 KHz sampling rate you would need 80 - 100 Kwords of storage. Probably
easier to do it in hardware than sticking a micro in it. Essentially a FIFO,
where you write in and read out with the same clock, but you don't start
reading out until the desired number of samples have been stored.

Tape? What's that? ;-)

I found the following IC

http://www.eetkorea.com/ARTICLES/2002NOV/2002NOV14_ICD_MSD_AN01.PDF

Allows for 2 seconds of delay, so I'm sure I could hook up 3 in series
to accomplish this task... Maybe I'll get it done for next football
season!
 
M

Mac

Jan 1, 1970
0
Just use a long piece of coaxial cable.
0.7 nanoseconds per foot.

This is not very practical.

Instead, modulate a laser diode and run the laser light through fiber
optic cable. The resulting 5 billion or so feet of fiber will be much more
manageable than the corresponding coax delay line.

You might still need a couple of repeaters.

--Mac
 
R

Rich Grise

Jan 1, 1970
0
This is not very practical.

Instead, modulate a laser diode and run the laser light through fiber
optic cable. The resulting 5 billion or so feet of fiber will be much more
manageable than the corresponding coax delay line.

You might still need a couple of repeaters.

Just go to the nearest Ham club, and ask to borrow their moonbounce
equipment. You might have to bounce it twice, I guess it's only about two
and a half seconds per bounce.

Cheers!
Rich
 
M

martin griffith

Jan 1, 1970
0
Making an analog audio delay line with a bunch of caps and coils might
be fun, though.
Back in the good old days when the BBC started up Radio1, the "pop"
channel the designs dept came up with an audio compressor that had a
1mSec LC audio delay line in the signal path so that the gain control
element did not have to change rapidly, eliminating a lot of pumping
that you get with fast attack times.


martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
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