Removing Hiss

[Ted205]

I'm looking for a method to remove abit of audio hiss. if i were to use a low pass filter what would be a suitable cut off frequency ?

I know this is abit of an application specific question but are there any rules of thumb to get me started.

[enzoR]

hiss, as in noise? if you can hear hiss, you dont want to filter it out as this would be in the audio frequency band. Your options are down to reducing the noise for example by lowering the gain, and using lower value (less noisy) resistors in the audio and feedback path.

[wakibaki]

Enzo is right.

If you can't get rid of the hiss by changing the balance of any volume controls in your system, you have little option but to modify or replace part of the system, probably the power amp or preamp if it is separate.

An average MP3 or CD player should have virtually imperceptible noise.

w

[Ted205]

Thats a very good point

However what is the realistic range of music, I'm sure it doesn't range from 20Hz to 20KHz

Also is there any benifit in removing any higher frequencies (say above 20kHz) so as to remove them (almost) from being amplifiered in the later stages.

[pikkujöpö]

Originally posted by Ted205


Also is there any benifit in removing any higher frequencies (say above 20kHz) so as to remove them (almost) from being amplifiered in the later stages.

In a way yes,you could size the RF filter in the input by ear.But so that it doesn't cut too much the high frequency.

Some listeners like the super tweeters,so it's up to your hearing if you want to amplifie the higher frequencies.