4 Mar
2010
4 Mar
'10
7:39 a.m.
On 04/03/10 11:27, fons(a)kokkinizita.net wrote:
On Thu, Mar 04, 2010 at 10:27:43AM +0000, Jonathan
Gazeley wrote:
Nick Copeland suggested simulating the force applied to the pedals by
calculating the rate of change of the cadence. I reckon that might do
the trick.
Yes - I have a cycle computer that can measure
cadence. However, I
typically pedal between 60 and 90 rpm which means my reading would only
be available for sampling every 0.7 - 1.0s. It would work, but in the
space of one second my cadence can vary a lot if I'm accelerating so the
sound of the rising revs would be jumpy.
Also, if I suddenly stopped pedalling, it might take up to a second for
the sampler to register and kill the engine noise. I don't think it
would be a very satisfactory experience, which is why I was thinking of
mounting 10 or so magnets around the chainwheel, to be able to sample
the cadence every 0.1s.
That would be a good rate. But for a realistic result you also
need to measure the force you are putting on the pedals, or the
chain tension - the noise of an engine depends very much on the
amount of power it has to deliver.
I've been working on engine noise simulation -
it's not very
difficult unless you want to exactly simulate an existing car.
That sounds promising :)