Topband: DSP and Latency

[Mark van Wijk, PA5MW]

Jim,

This is a matter of semantics.
The word "latency" was only shortly introduced to most of us, linking to 
that "awkward little time delay while doing audio via internet".
The true and longer explanation is correctly described in your words.
Same for your solution.

Newer technologies in our daily life introduce new words. And most of the 
time people receive them first via commercials and from mouth-to-mouth 
chatter at coffee time.  One cannot expect that at every new word people 
start checking all backgrounds in Wikipedia or dig out the required 
technical theory books. As such we see in daily life that the short 
practical application is adapted, without even thinking about what is behind 
that word.
>From a more scientific standpoint of view we can argue that one should not 
just blindly accept &use any new (hyped?) word so quickly  before doing some 
proper learning on the topic. But the average Joe?
Fact is that in our society we see three major 'groups' which are verbally 
and semantically often quite 'out of sync':
- people active in technical, quality, service related disciplines
- people active in sales, marketing
- average Joe
And then there are still some smaller groups like designers and lawyers, but 
these are waaay off the grid :)
It is a challenge to communicate effectively between the above three 
mentioned groups. Even more if there is to be negotiation or service, call 
centers etc. Connecting(bridging)these worlds is partly my daytime job.

And then there's pronunciation.
95% cannot pronounce words like Feng Shui, Huawei, Baofeng correctly.
Yet, even commercials adapt to how  Joe responds to them, to keep it 
recognizable and acceptable for him.
Not an ideal world you might say, but it is what it is.

73 Mark, PA5MW



-----Original Message----- 
From: Jim Brown
Sent: Tuesday, March 17, 2015 10:41 PM
To: topband at contesting.com
Subject: Topband: DSP and Latency

On Tue,3/17/2015 12:48 PM, Frank Bogers - ON9CC / PA9A wrote:
> Audio latency can be solved by DSP.

What do you mean "solve?" Latency is TIME -- more specifically, it is
the time it takes electrical signals to get from point A to point B. If
digital transport is involved, there is also the time it takes to
convert from A/D and D/A. Transmission via radio is at the speed of
light. Transmission via the internet is much slower, because of routing
protocols and the equipment needed to implement them.

Typical internet latencies are in the range of 100 msec, so you're a bit
behind. DSP can ADD delay, so that two signals are more nearly in sync,
but it cannot REMOVE delay.

Also, ALL signals are delayed -- CW, RTTY, control signals, not just audio.

73, Jim K9YC


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