Tone generation in Dark Basic - GameCreators Forum

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robmaggs

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Joined: 17th Apr 2006

Location: Anglesey UK

Posted: 18th Apr 2006 12:53

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Anyone know how to generate tones in HZ with a given duration?

ie I would like to create two tones one 100hz and another 110hz and play them together for a duration selected by the user. I can't see how this can be done in dark basic. I had a zx spectrum years ago and i remember the "beep" command...but does dark basic have anything like this hidden away?, or do you have to call a windows dll and if so how do you do it?

Thankyou in advance oh splendid programmers, I respect you!

All the best Rob

http://www.moonfish-design.co.uk

www.moonfish-design.co.uk

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TDK

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Joined: 19th Nov 2002

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Posted: 19th Apr 2006 07:27

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There's no equivalent to the old Speccy beep command in DB.

However, you should be able to 'kludge' it using the Beep function in Kernel32.dll with a DLL call.

The code below ought to work, but on my machine it doesn't, so you can try it. If it doesn't work, then I don't think you can do anything about it - other than record two wav files using a third-party tone generator program.

If you record half a second, you can use a timer in DB to loop them for the specified amount of time.

+ Code Snippet

Sync On: CLS 0
Load Dll "Kernel32.dll",1

Input "Enter Frequency: (KHz) "; Freq
Input "Enter Duration (Milliseconds): "; Duration
Beep(freq, duration)
Print
Print "Finished - Press A Key"

Wait Key
Delete DLL 1
End

Function Beep(freq, duration)
  Call DLL 1,"Beep", Freq, Duration
EndFunction

TDK_Man

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robmaggs

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Joined: 17th Apr 2006

Location: Anglesey UK

Posted: 19th Apr 2006 13:45

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Thanks TDK, your help is invaluable, tried both methods but the second technique using a sample is the best approach.

I made a 100hz sample and then used the SET SOUND SPEED command to alter the frequency. Fantastic exactly what I want...well almost.

How can the frequency of the sample be changed according to values the user inputs, Ie user types in 110hz and by using "set sound speed" 110 hz is played.

Thankyou in anticipation, your help is greatly appreciated.

Cheers Rob