Retinal Prosthesis Dissertation - Student Home Pages
Retinal Prosthesis Dissertation - Student Home Pages
Retinal Prosthesis Dissertation - Student Home Pages
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T plane = time for one plane<br />
P p = number of pulses per plane<br />
Equations (1) (b) and (2) can be combined in the following way:<br />
T<br />
spike<br />
Tpacket<br />
I<br />
spike<br />
(3)<br />
P<br />
p max<br />
So in this case T spike + I spike =<br />
39062.<br />
5<br />
781.<br />
25ns<br />
50<br />
From observation of the preceding spike representation figure it can be seen that for<br />
maximum pulsing:<br />
T pulse = 5*T spike (where T pulse = (interval + T spike ) this gives a factor to be used with<br />
(3) to calculate T spike directly:<br />
T<br />
spike<br />
I<br />
spike<br />
Tpacket<br />
<br />
<br />
M<br />
p<br />
* Pp<br />
Tpacket<br />
<br />
<br />
M<br />
p<br />
* Pp<br />
max<br />
max<br />
1 <br />
<br />
5<br />
<br />
4 <br />
<br />
5<br />
<br />
. (4)<br />
Using (3) and (4) would give a spike time of 781.25 ns 5 = 156.25 ns. This<br />
minimum duration spike time, derived at maximum pulsing, will be a constant<br />
<br />
<br />
spike constant<br />
T for the test scene. In this case thenT spike<br />
= 156.25 ns. Now that<br />
constant<br />
Tspike constant<br />
has been determined for the system the constraint for maximum pulsing can<br />
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