Real time frequency multipliar

[devidasbhonde]

Hi,

I have a 2Hz to 50Hz biological signal sampled at 256 Hz.
I wish to multiply it by say 64 so as to make it audible.
And it is necessary that the time lag is as less as possible.
Please suggest me what to do.

Any help is appreciated.

Regards,

Devidas

 

[IanP]

Frequency multiplication can be easily achieved with the PLL circuits ..
https://www.altera.com/support/devices/pll_clock/basics/pll-basics.html
As an example, take a look at the CD4046 ..
**broken link removed**

Regards,
IanP

 

[jiripolivka]

To make the low-frequency signal audible, you can also use an up-converting mixer to shift the spectrum into audible region.
The simplest way to do so can also be- use a 555 timer running as astable multivibrator and inject your low-frequency signal into pin 7 via a 0.1 uF capacitor. Adjust DC voltage on this pin with a potentiometer to hear the sound.
You can also use another pulse generator, there are many voltage-to frequency IC converters that can work a similar way.