Topband: DSP and Latency

[Tim Shoppa]

Current fastest way of communicating between two points on the planet is
via neutrino beam (which travels just fine through solid rock, we don't
need no stinking ether or fiber). Incidentally, they use something very
similar to morse code (regrettably, not actual morse code!). See
http://arxiv.org/abs/1203.2847

Look at the size of their collaboration! Must be 100 authors on that paper.
Makes most multi-multi's look tiny. Of course they only ever had one
claimed QSO and it wasn't even 2-way :-)

Tim N3QE

On Tue, Mar 17, 2015 at 7:03 PM, Herbert Schoenbohm <herbs at vitelcom.net>
wrote:

> I listen here to Yuri N2TTA operate my remote contest station NP2P (SO2R)
> here from his apartment in NYC. My latency to his location is about 120 ms
> and the link is end to end fiber which travels at about 124,000 miles per
> second.  I can not detect any delay nor problems even when he is running
> stations at 200 or more q's per hour at 40 wpm.  It is really an improved
> technology via the internet.  But ironically since fiber is slower than
> microwave, end to end stock market traders who have set up microwave links
> to Chicago from Wall Street are able to make fortunes by using a faster
> speed and scooping up transactions by arriving a few ms ahead of the orders
> coming in via fiber.   Amazing stuff  I think that Albert Einstein even
> studied the possibility of having matter travel faster than light. Right
> now all we have working is mental telepathy which reminds me of some of my
> 160 meter DX QSO's in 40db over S9 tropical QRN.☺
>
>
> Herb Schoenbohm, KV4FZ
>
> On 3/17/2015 5:41 PM, Jim Brown wrote:
>
>> 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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>>
>
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