Help with freq( command

[goodegg610]

How does the frequency command work? If we wanted to play a C for a period of time, what would you put in and why?

[Yeong]

I believe it works like Freq(wavelength,period).
And it uses to produce sound.
EDIT: Freq(314,10000) produces A3 note (I think)

[linuxgeek96]

Freq(1.29,1000)

[Yeong]

Can freq( take decimal value?

[leafy]

I'm assuming no, since Axe doesn't work natively with decimals. Also, for smaller questions like these maybe you want to post them in the Axe Q&A thread here?

[Builderboy]

Leafy you silly, Axe supports converting decimal numbers like 1.29 into 8x8 format

Code: Select All | Copy To Clipboard

1	INT.DEC The non-integer decimal number as an 8.8 fixed point number. Maximum 3 decimal places allowed.

[Runer112]

The Freq() command takes two arguments: wavelength and time. TBO_Yeong and linuxgeek96, I'm not sure where you got your wavelength numbers from, but neither of them appear to be correct. The approximate value that I got was 487, using this formula for the wavelength argument with middle C's frequency, 261.63Hz:

Wavelength argument = (6000000/frequency - 62)/47


Now, to deal with the time argument. The formula for this is a little more complex, since it doesn't have an explicit form, only implicit:

Desired duration = (47*time argument + 48*floor(time argument/wavelength argument) + 71)/6000000

However, if we give floor(time argument/wavelength argument) an approximate constant value instead (I'll give it about 50), we can get an explicit form:

Time argument = (6000000/desired duration - 2500)/47

If we wanted a note length of 1/4 of a second, this would give us a time argument of approximately 31900.


Putting it all together, to play middle C for about 1/4 of a second, you would use the following code: Freq(487,31900).

[Yeong]

Oops. What I meant was A2, not A3. XP

Also, for wavelength, here: http://www.phy.mtu.edu/~suits/notefreqs.html

It works.