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about the frequency range though.... no specified limit... higher the range i can measure i feel the better it will be...

and there is nothing about this amplitude level also...

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yes sir... it is an echo...

i am trying to get help from as many sources as possible... i am a student from india.. and most of our teachers are not able to guide us in this project... they suggest the use of dsp processors... but i have no idea about them.... i am a second year undergrad student... just learning the basics of signal processing... so i am on the look out for circuits using components i know...

moreover i do not even know about this PLL.... but after it was suggested i have begun learning about it through the net... my sole aim is to get help from as many sources as possible....

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The suggestion is to use a PLL IC sir???

but how do i diplay the period onn a 7 segment display??

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yes sir.... i am sure that i don not want to use a microcontroller...

i have attached a picture of a periodic signal... will your method be applicable to such signals??? i will not be using a CRO at any stage... so i cant view the signal also...

say this is my input signal... and my output should be the frequency or period of the signal mentioned on a bcd display unit....

how to do???

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Sir... thank you for your idea....

and once a rectangular wave is produced at the output.... how do i measure its frequency??? or say the period???

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Hi everyone out there...

I am working on a circuit that has the ability to measure the fundamental frequency of an incoming periodic signal. I do not want to use a microcontroller.
Initially i had the idea of using peak detection and comparison... The distance between two max. peaks gives the period. But what if the signal has multiple peaks in the same period???
I REQUEST EVERYONE TO SUGGEST CIRCUITS FOR THIS PROJECT... PLEASE... PLEASE