Demodulation of SSB Waves:

Single-sideband (SSB) waves are a type of amplitude modulation (AM) that have been filtered to remove one of the sidebands and the carrier wave, leaving only the other sideband. Demodulating SSB waves requires a different approach than demodulating standard AM waves, as the carrier wave and one of the sidebands have been removed.

One common method for demodulating SSB waves is to use a product detector, also known as a synchronous detector. This type of demodulator multiplies the incoming SSB wave with a local oscillator signal that is set to the same frequency as the missing carrier wave. The result is a signal that includes both the missing sideband and the audio modulation. A low-pass filter is then used to remove the high-frequency components, leaving only the audio signal.

Another method for demodulating SSB waves is to use a phasing method. This involves splitting the SSB wave into two separate channels, one delayed by 90 degrees, and then combining them. The result is a signal that includes both the missing sideband and the audio modulation. Again, a low-pass filter is used to remove the high-frequency components, leaving only the audio signal.

Both of these methods are effective for demodulating SSB waves, but the product detector is generally considered to be the simpler and more reliable option 

Demodulation of SSBSC wave using coherent detection is as shown in fig. 16. The SSB wave 𝑠(𝑡) together with a locally generated carrier 𝑐(𝑡) = 𝐴′c cos(2𝜋𝑓 𝑡c + ∅) is applied to a product modulator and then low-pass filtering of the modulator output yields the message signal.

Coherent Detector of SSBSC

The first term in the above equ.(1) is desired message signal. The other term represents an SSB wave with a carrier frequency of 2𝑓𝑐 as such; it is an unwanted component, which is removed by low-pass filter.