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Topic: High pass filter, normalize, clipper addon (Read 1657 times) previous topic - next topic
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High pass filter, normalize, clipper addon

Hi is there a high pass filter component that will achieve the following

More specifically, optimum results have been achieved by using a filter having a 12 decibel per octave slope from 0 to 15,000 cycles per second. In one specific embodiment, this filter is formed by a pair of tuned amplifier circuits each having a 6 decibel per octave slope within the frequency range of interest. In this embodiment, the speech waveform is preferably combined with a high frequency noise masking signal of lower amplitude prior to processing.

Another normalize
Then another for clipper
Cheers
Damian

 

Re: High pass filter, normalize, clipper addon

Reply #1
None of that is very clear.   All of this should be possible with a regular audio editor (Audacity, etc.), if the filters are fixed.   I'm guessing this is some kind of audio compression and that the filters are not fixed.

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More specifically, optimum results have been achieved by using a filter having a 12 decibel per octave slope from 0 to 15,000 cycles per second.
That doesn't make sense unless it's a variable frequency filter.   i.e.  12dB per octave high-pass at 10kHz means something.   A high-pass or low-pass filter has a single cutoff frequency.   A bandpass filter has a low & high cutoff, but a 0-15KHz "bandpass" filter is a low-pass filter.  If it's variable, what controls the cut-off frequency?    

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In one specific embodiment, this filter is formed by a pair of tuned amplifier circuits each having a 6 decibel per octave slope within the frequency range of interest.
Again, not enough information.

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In this embodiment, the speech waveform is preferably combined with a high frequency noise masking signal of lower amplitude prior to processing.
What frequency, what level, and what's the frequency band of this "high frequency noise"?

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Another normalize
Then another for clipper
It's kind of unusual to clip after normalizing.    Well...  Since clipping is distortion it's unusual to intentionally clip at all...    Sometimes you normalize after processing to prevent clipping.