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Sine Wave adder

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Mon, 12/02/2024
9:16am
daniel.qu_13771
#1
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#1
Sine Wave adder

Hi guys,

I have this frustration that when adding two sine waves of different frequency to one channel output, for example 500hz and 1000hz, the output audio is not what a 500hz + 1000hz sound like but a very high pitch and loud sound. The frequency in the sink still shows the right frequency (two peaks at 500hz and 1000hz).

Any one knows why and how can I properly add two sine waves together?

Thanks,

Daniel

Mon, 12/02/2024
10:41am
DSPC_Gary
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Hi Daniel, 

You need to be mindful of signal amplitudes when you do a float->fract32 conversion.  Most likely the signal amplitude is over +/- 1.0 and is clipping heavily.  You can put a Meter on the Interleaver output pin to check this.  If it's over 0 dB then you will clip at that final Type Convertor.  I would suggest putting a Scaler module inline with the adder output and setting the gain to -12 dB or 0.25.  Does this help?

Thanks,

Gary

Mon, 12/02/2024
10:46am
daniel.qu_13771
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(Reply to #2)

Thanks Gary! That solves the issue, and thanks for explaining the reasoning behind!