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I would like to build a circuit that adds a "vibrato" audio effect to a simple sine wave input.

Sample audio clip from Wikipedia: Vibrato, Sound Frequency 500Hz, Frequency Modulation 50Hz - Vibrato Frequency 6 Hz https://upload.wikimedia.org/wikipedia/commons/e/e7/Frequenzmodulation.ogg

This sample effect is exactly what I want to create. I already have a circuit that generates a sine wave, and I can easily generate a 50 Hz frequency modulator. I'm just unsure of how to create a circuit that would provide that 6Hz vibrato effect and combine everything together to get the desired sound.

Does anyone have any ideas of things I can try to replicate the sample audio with the effect?

Thanks

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    \$\begingroup\$ Please clarify how you designed sine wave generator (it may define design of the vibrato circuit/algorithm), and what you mean with vibrato as it may involve regular change of frequency and/or amplitude. \$\endgroup\$ – Anonymous Mar 10 '17 at 20:46
  • \$\begingroup\$ Well it sounds like every 6 seconds the sine wave goes from 475Hz to 525Hz and back, if you're creating this tone digitally using a DAC, the solution is trivial since you can do it in software. \$\endgroup\$ – Kent Altobelli Jul 15 at 22:46
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I and Q modulators can be used; I've used them to generate Minimum Shift Keying for GSM cellphone signaling; the 2 GSM signals/baud/symbols are Frequency Shift Keyed/modulated.

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You want to frequency modulate the 500Hz tone by 50Hz at 6 times per second. You did not show the schematic of your 500Hz oscillator for us to see if it is possible to modulate its frequency.

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