Is audio inversion what I am after ?

[Externet]

Or is it something else or additional ?

An upper sideband radio transmitted signal is meant to be received and demodulated in upper sideband mode.

If the receiver is set to lower sideband, the resulting demodulated audio inteligibility is impaired.

Can that wrongly demodulated signal be transposed/converted to fully intelligible by manipulating the audio only; keeping the wrong reception demodulation mode ?

In other words, can a receiver with upper sideband demodulation only, output the correct audio by the use of some analog audio inverter/converter/transposer circuit ?

What is such circuit called ? Does it exist ? How to do it ?

 

[audioguru]

A single-sideband receiver uses radio-frequency filters to select the wanted sideband and reject the unwanted sideband. If the carrier is suppressed then it adds a local carrier. If the radio selects the wrong sideband and rejects the wanted sideband then the audio will be very weak and I think the audio frequencies will be backwards and sound like a duck quacking and cannot be "fixed".

Inverting the audio changes only the phase. You cannot hear a change of phase so if you invert the "duck quacking" then it will still sound like a duck quacking.

 

[Externet]

Thanks.
Do you think that the NE602 would not produce the 'unqacking' of the mirror image 'wrong' audio; or it may well do it ?

----> **broken link removed**

 

[audioguru]

Years ago I made a similar voice scrambler using a Motorola balanced modulator IC and a National switched capacitor filter IC.
The audio frequencies were inverted (high frequencies were converted to low frequencies and low frequencies were converted to high frequencies) so its scrambling was very good and the output was unintelligible. The descrambler circuit was nearly the same. But inverting audio phase is very simple and is completely different.