Frequency increasing problem

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Frequency increasing problem

Permanent link to this post Posted by dannu » Sat Feb 24, 2018 7:45 am

I hope this is the right area for this question. So I have this app idea and it requires a recorded audio clip of me saying a few words with a frequency of 14000-15000hz. I just tried recording some audio and increasing the pitch but that completely distorted the audio and made it intelligible and barely audible. Is there any way I can increase the pitch that much and somehow keep the audio somewhat intelligible?
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Re: Frequency increasing problem

Permanent link to this post Posted by Trebor » Sat Feb 24, 2018 9:34 am

For most people 15kHz is inaudible, effectively ultra-sonic : silent,
see ... https://forum.audacityteam.org/viewtopi ... 86#p148686
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Re: Frequency increasing problem

Permanent link to this post Posted by dannu » Sat Feb 24, 2018 12:28 pm

Yeah I know, that's kind of the point of my app. I tested with a few youtube videos and I could hear up to about 16000-16500hz so I should be able to hear it. When I changed the frequency to 15000hz, the soundwaves for the audiotrack almost disappeared. I'm not sure if the link you provided really helps with my issue. I want to record some speech, change the frequency to 15000hz and somehow keep the audio audible and comprehensible (obviously only for people that can hear within that frequency range).
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Re: Frequency increasing problem

Permanent link to this post Posted by DVDdoug » Sat Feb 24, 2018 4:13 pm

That doesn't make sense because voice requires a range of frequencies. For example, traditional telephone frequency response is about 4 octaves from 300 - 5000Hz. You loose the highest & lowest voice frequencies but it's still intelligible. If you shift the bottom of that range to 16kHz, that's a factor of about 50 and the range would be 16kHz to 250kHz.
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Re: Frequency increasing problem

Permanent link to this post Posted by Trebor » Sat Feb 24, 2018 7:12 pm

dannu wrote: I want to record some speech, change the frequency to 15000hz and somehow keep the audio audible and comprehensible

The last few seconds of this are above 15kHz ...

DonaldT AM ramp.flac
Amplitude Modulation by carrier of increasing frequency
(655.7 KiB) Downloaded 10 times
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Re: Frequency increasing problem

Permanent link to this post Posted by dannu » Mon Feb 26, 2018 7:31 pm

Ok, so I guess my idea won't work but thanks for the help anyway!
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