Satellite to Satellite communication ?

Hello:
1. When you make an international phone call - say from NY to China -
how does the voice data travel ? Does it have to be send to the
satellite and then received at teh ground, some distance away, then
sent to another satellite till it reaches the destination country. ? I
mean is there any direct satellite to satellite communication. Or is
it always bouncing between teh satellite and the ground at an angle.

2. Is this true for international television programming too ? I know
there are live television from Arab countries, Japan etc, in US.

Thanks
--sony

In article ,
says...
Hello:
1. When you make an international phone call - say from NY to China -
how does the voice data travel ? Does it have to be send to the
satellite and then received at teh ground, some distance away, then
sent to another satellite till it reaches the destination country. ? I
mean is there any direct satellite to satellite communication. Or is
it always bouncing between teh satellite and the ground at an angle.

2. Is this true for international television programming too ? I know
there are live television from Arab countries, Japan etc, in US.

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Note that I didn't actually answer your question, because I don't know.

Marc

Marc 182 wrote:

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Paul

Paul F. Dietz wrote:
Marc 182 wrote:
Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Yeah. In general, it's always been true that what could be
put on a landline was put on a landline, telecommunications-wise.
The old transoceanic cables didn't have the performance to do
high bandwidth multichannel voice. Comsats took off as the
first good option for transmitting multiple voice channels
across oceans. They then caught on doing TV broadcast,
though that had been a feature on the first experimental
comsat that flew.

Both wire cable and fiber optic cables undersea started
to compete with comsats and are taking increasing quantities
of the market there. They're a lot cheaper now than
satellites are, for major concentrations of traffic.
And as soon as the fiber optic cables were proved out,
the satellite market for transoceanic voice started to
die out slowly. But not entirely. There aren't enough
cables in a lot of places, and both the cables and the
satellites break sometimes, so they end up backing each
other up to a large degree.

Orbital relay works better for broadcast purposes and
for hitting lots of little islands out in an ocean.
And always will.


-george william herbert

Has anybody ever heard of Echo-Cancelling devices? These can mitigate the
effect of the "bounce" to a great degree. Also, to compensate further,
"Reverb" can be added to flesh out tone and timbre.

just some info

S Smith


"Paul F. Dietz" wrote in message
...
Marc 182 wrote:

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Paul



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Stewart Smith wrote:
"Paul F. Dietz" wrote in message
...
Marc 182 wrote:

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Has anybody ever heard of Echo-Cancelling devices? These can mitigate the
effect of the "bounce" to a great degree. Also, to compensate further,
"Reverb" can be added to flesh out tone and timbre.

Echo cancelling does nothing to reduce time-of-flight issues.
A half-second delay is still a half-second delay.

Adding reverb is contraindicated for telephone communications,
as it tends to reduce intelligibility. Check out speakerphones
for examples thereof. As a matter of fact, there is a fair bit
of research for _reducing_ reverberation in speakerphones.

Signal processing techniques are not useful for fixing problems
due to speed of light causing delays.

300,000 km/second: not just a good idea, it's the law.


Francois.

In article 1070919774.530038@smirk, says...
Echo cancelling does nothing to reduce time-of-flight issues.
A half-second delay is still a half-second delay.

A half second is a half second, but canceling the echo does help
intelligibility by removing some noise from the signal. Time-of-flight
isn't the only issue.


Adding reverb is contraindicated for telephone communications,
as it tends to reduce intelligibility. Check out speakerphones
for examples thereof.

Excessive reverb is a bad thing. Done correctly, reverb adds a sense of
presence without interfering with intelligibility.


Signal processing techniques are not useful for fixing problems
due to speed of light causing delays.

True, but these tools are useful for lots of other real-world problems.
--
Kevin Willoughby lid

Imagine that, a FROG ON-OFF switch, hardly the work
for test pilots. -- Mike Collins

Thanks for setting me straight Francois, you are correct


"(null)" wrote in message news:1070919774.530038@smirk...
Stewart Smith wrote:
"Paul F. Dietz" wrote in message
...
Marc 182 wrote:

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying
delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Has anybody ever heard of Echo-Cancelling devices? These can mitigate the
effect of the "bounce" to a great degree. Also, to compensate further,
"Reverb" can be added to flesh out tone and timbre.

Echo cancelling does nothing to reduce time-of-flight issues.
A half-second delay is still a half-second delay.

Adding reverb is contraindicated for telephone communications,
as it tends to reduce intelligibility. Check out speakerphones
for examples thereof. As a matter of fact, there is a fair bit
of research for _reducing_ reverberation in speakerphones.

Signal processing techniques are not useful for fixing problems
due to speed of light causing delays.

300,000 km/second: not just a good idea, it's the law.


Francois.



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Echo cancellation reduces echo, it doesn't do anything to delay except
potentially add to it. Delay doesn't show up as an echo - echo is due to
mismatches; delay is due to propagation delays, processing delays, and
similar time-wasters.

Ken

"Stewart Smith" wrote in message
y.com...
Has anybody ever heard of Echo-Cancelling devices? These can mitigate the
effect of the "bounce" to a great degree. Also, to compensate further,
"Reverb" can be added to flesh out tone and timbre.

just some info

S Smith


"Paul F. Dietz" wrote in message
...
Marc 182 wrote:

Multi-jump communications would create unacceptable delay in a voice
conversation due to the speed of light and the distance to the
satellites. Even a single jump causes a noticeable and annoying delay.
That's why trans-Atlantic/Pacific cables remain popular.

Cables are popular because they're *cheaper* than satellites
(per unit of delivered bandwidth) what with the incredible advances
in fiber optics.

Paul



---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.548 / Virus Database: 341 - Release Date: 12/5/03

"Ken Taylor" writes:

Echo cancellation reduces echo, it doesn't do anything to delay except
potentially add to it. Delay doesn't show up as an echo - echo is due to
mismatches; delay is due to propagation delays, processing delays, and
similar time-wasters.


You need a thiotimoline injector to solve the delay issue.
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