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Post by Gary Lecomte on Oct 10, 2016 17:01:27 GMT -8
Just Playing in some Spare Time. These are saved as " wav" Files. Various Sine Wave Frequency Tones from 10 Hz to 20,000 Hz. Each Frequency Tone is Named and Each tone is 9 Seconds in length. You probably will not be able to hear the Lower and Higher Frequencies, Due to your Hearing Ability and the Frequency Response of your Amp and Speakers. Click Here |
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dave
Junior Member
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Post by dave on Oct 10, 2016 21:14:43 GMT -8
Ok so I think I might be somewhat deaf ...well not really . I can hear the 10 hz as a noise the 20 hz as oscillation ,right up to 10,000 hz and at 11,000 I'm deaf Ha !.....very interesting thanks Gary.
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Post by radioman on Oct 11, 2016 7:36:32 GMT -8
Listening to the tones through inexpensive earphones, my high frequency limit is somewhere between 12 kHz and 13 kHz...and then I can't hear anything above that! I'm not sure about the frequency response specs of my headphones so I'll try my hi-fi headphones later.
Thank you greatly for posting these files - I downloaded them for future use. Since several increasing frequencies in steps appear in each file (vice a separate file for each frequency), comparison testing is easier to perform. When I have some time, I'd like to run the files through variations of the LM386/LM380 based small amplifiers and look at distortion levels vs. frequency (and vs. power output) on my oscilloscope. Some variations sound better than others and I don't know if it is because of my hearing or the component values that were used.
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Post by Gary Lecomte on Oct 11, 2016 13:16:31 GMT -8
I also Joined these 4 audio clips into One file and converted it to an MP3 file to listen with my MP3 player.
I Added this MP3 file into the Link above.
At 71 y/o now, My Hearing limit Quits at just above 8Khz.
Doesn't surprise me as when I was in my late teens, I damaged the hearing in my left ear with an explosion from a home made bomb.
And I have always liked Louder Music.
ENJOY!
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Post by radioman on Oct 11, 2016 17:21:18 GMT -8
Running the 4 separate .wav files into a LM386 based amp yielded some interesting results (to me, at least). The 386s are noisier than I thought, i.e, faint background hiss becomes more noticeable on my scope as the frequency and amplitude are varied. Incidentally, the 9 second tone length is about right to get a good visual of the sine before it automatically steps up in frequency. With the single mp3 file, an assessment of an audio hardware's ability to reproduce the audible spectrum can be made in one shot!
Very nifty files for testing/comparing audio circuits (not just our ears!) - many thanks again for sharing them as it must have taken a significant bit of time to make them.
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Post by Gary Lecomte on Oct 11, 2016 18:00:46 GMT -8
Quote: Very nifty files for testing/comparing audio circuits (not just our ears!) - many thanks again for sharing them as it must have taken a significant bit of time to make them.
Not too long.
The Joining , Removal of the Multiples (100, 1000 and 10000) and conversion to the MP3, and editing my htm file took about 20 minutes.
Am Considering a Long Sweep from 20 to 20,000 in 1Hz steps (No Breaks between) but that would be really time consuming.
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