Design a narrow band FM modulator and demodulator units

Design a narrow band FM modulator and demodulator units based on the following rules.  By using your design, assume that you are planning to broadcast music and listen to it.

Design Principles:

• bandwidth of message signal will be 6kHz in case of double sideband solutions.
• the carrier frequency is 4MHz.
• Allowable maximum frequency deviation the system 50kHz.

a) Determine the values of elements (if any; R, C, and L) used in the circuits.

b) In case of  noise ( added to the modulated signal,

• What can be the SNR at i/p stage of demodulator?
• What can be the SNR at o/p stage of demodulator?