what would you call this device?

[circuitmangler]

Imagine a device which takes an input signal, applies a
tuneable narrow bandpass filter followed by some sort of
gain control and then "emits" the intensity of the result
in one or more ways such as analog meter, audible tone,
bar graph, digital readout, etc.

It's kind of like a spectrum analyzer that can only
analyze one frequency at a time.

Is there a general term for this kind of device?
Thanks!

 

[IRstuff]

Actually, the old-fashioned spectrum analyzer is as you describe.

TTFN

 

[VEBill]

"It's kind of like a spectrum analyzer that can only
analyze one frequency at a time."

Most (all?) RF spectrum analyzers can only deal with one frequency at a time - they just sweep their receiver. It is worth keeping this in mind when looking for transcient signals.

For audio spectrum analyzers, I suppose that FFT systems predominate (cost reasons).

 

[nbucska]

selective voltmeter ?

<nbucska@pcperipherals DOT com> subj: eng-tips

 

[logbook]

Narrow band detector