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FamiTracker > General > FamiTracker Talk > Would like some help with the Pitch Effect Owner: Spankenstein

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Would like some help with the Pitch Effect Posted: 2010-11-14 13:40

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Spankenstein

Member for: 5699 days
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#11195

Hi there.

Just started using this tracker, in fact, it's the first tracker I've ever used and I would like to ask a question about the Pitch Effect Smile

Is the 16ms time step based on the time for one frame at 60Hz? (16.66666..)

Does the effect do the following to the note:

- Take the current frequency (Hz)
- Minus the the number in parse text box (i.e. negative nos. negated)
- Repeat every 16ms if the '|' is used

So '| 8' would decrease the frequency by 8Hz every 16ms?

Why does:

'| 8' settle on an audible pitch

whereas:

'| -8' doesn't?

Thank you.

Posted: 2010-11-14 16:53

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nicetas_c

Member for: 6045 days
Location: AB, CA
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#11196

Posted: 2010-11-14 18:01

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Spankenstein

Member for: 5699 days
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#11197

Posted: 2010-11-14 18:49

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nicetas_c

Member for: 6045 days
Location: AB, CA
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#11199

7FF is in base 16, so that means 2047. The formula between the period register and the actual frequency is HP=111860 where P and H are the register and the frequency respectively.

Posted: 2010-11-14 19:45

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Spankenstein

Member for: 5699 days
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#11200

Could you please explain where the relationship 'HP=111860' is derived from? It doesn't make sense to me.

Posted: 2010-11-14 20:04

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nicetas_c

Member for: 6045 days
Location: AB, CA
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#11201

It isn't supposed to make sense either, go ask the one who made the 2A03 sound chip.

Posted: 2010-11-15 00:23 (Last Edited: 2010-11-15 00:29)

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Spankenstein

Member for: 5699 days
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#11204

Cool, I wont sweat it then Smile

Can you please tell me your source of information for the chip? In other words where did you learn of the H to P ratio, or did you just get the value from the maximum possible value?

Posted: 2010-11-15 01:21

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TechEmporium

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Member for: 5947 days
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#11208

There are multiple sources on the NESDev website:

http://nesdev.parodius.com

You may also want to download a copy of the help file that normally comes with FamiTracker (if you don't have it already).

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Posted: 2010-11-15 12:46

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Spankenstein

Member for: 5699 days
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#11213

Thank you

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