TPA6120A2: 180 degree out of phase constructive interference sine-wave.

Christopher James

Part Number: TPA6120A2

Is there a simple way in which I can create an180 degree out of phase constructive interference sine-wave from one channel of my sound card to an accuracy of at least 0.1Hz, please?

Ivan Salazar kindly suggested that I use Audacity Software but regrettably it appears only to be accurate to 1Hz.

The software that I am using from 'onlinetonegenerator' has the accuracy but it does not appear to have the ablilty to create an out of phase secondary sine-wave.

Presently my sound-card is generating typically just over a 7 volt ac signal to each phase of the stereo output, and I need to achieve the output of both left and right outputs phases combined into a single mono signal. Hence why Ivan kindly suggested that I create a second out-of-phase signal from say the right-hand phase.

Your kind help would be greatly appreciated, please?

Thank you so much.

Christopher J James

over 5 years ago

0 Luis Fernando Rodriguez S. over 5 years ago

TI__Guru* 84915 points

Hi, Christopher,

Have you tried to save a waveform with onlinetonegenerator and then adjust it with the help of Audacity or another audio software?

Best regards,
Luis Fernando Rodríguez S.

0 Christopher James over 5 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 880 points

Dear Luis,

Your kind suggestion sounds intriguing but sadly, I lack the expertise, nor do I know how to create a continuous loop for playback.

Thank you nevertheless.

Christopher

0 Luis Fernando Rodriguez S. over 5 years ago in reply to Christopher James

TI__Guru* 84915 points

Hi, Christopher,

In Audacity, once you open your audio file, there's Menu called "Transport".

Then, there's a submenu called "Playing". This submenu contains the option "Loop Play". It can be used to create a continuous loop with a single audio file.

Best regards,
Luis Fernando Rodríguez S.

0 Christopher James over 5 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 880 points

Dear Luis,

Thank you so much for the further precise information.

I will look at this a little later, and if I may, I will report back, how I have got on.

If I can produce a second out-of-phase signal, allowing me to double the output to my prototype rig, it could well make all the difference.

Thank you so very much, once again.

Christopher

0 Christopher James over 5 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 880 points

Dear Luis,

Audacity seems to be looking for an audio file, yet onlinetonegenerator dot com does not have an export/download function. I run win7 x64 on my pc. I have attempted to run the online sine-wave at circa 40Hz and to save the .wma file using the in-built 'sound-recorder'. Unfortunately, the sound recorded is nothing like that I hear either over my headphones or my Bose speakers.

Can you please offer any further kind advice, please?

Thank you so much.

Christopher

0 Luis Fernando Rodriguez S. over 5 years ago in reply to Christopher James

TI__Guru* 84915 points

Hi, Christopher,

Sorry for my late reply. Did you were able to get the audio file? Regarding the onlinetonegenerator website, it seems that there's an option to save the configured tone. Have you used the "save" option?

Best regards,
Luis Fernando Rodríguez S.

0 Christopher James over 5 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 880 points

Dear Luis,

I managed to record a section of the track in Audacity annd create what I believe is pseudDiff track as per the image appended below. I am now endeavouring to create a new circuit to enable me to use the enhanced signal.

Thank you so much.

Christopher

Audio

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TPA6120A2: 180 degree out of phase constructive interference sine-wave.