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What is Side tone coupling? Explain with circuit diagram.

 
Simplex communication:in telephone communication only two entity is involved one is transmitting(talking) and one is receiving(listening) is known as simplex communication.

Half-duplex communication: in communication information transfer in both ways but not a simultaneously is known as the Half-duplex communication.


Full-duplex communication:in communication information transfer in both ways  simultaneously is known as the Full-duplex communication.

Side tone coupling: In telephones, it is the hearing of one's voice in the receiver when one speaks. Too much side tone make people speak lower and can cause feedback. Too little side tone and people may think the phone is not working or may shout.



                                 Fig: Smooth Tone Clickless CW Sidetone Generator


                                     Fig: Schematic diagram of the sidetone circuit

Figure Description: This is a simplified schematic diagram of a receiver sidetone circuit. Because current will not flow through a balanced circuit, the turns ratio of inductors L1 and L2 is unbalanced by a predetermined amount and the value of resistor R is changed so as not to match the line impedance. This way, a controlled amount of signal can be induced into L3 to be used as receiver sidetone.

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