Stereo FM

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Stereo FM

  1. 1. What Stereo Means :-
  2. 2. How then comes the virtualization ??
  3. 3. What do we need for the transmission? • We need two different signals L(left) & R(right) to be modulated, transmitted, received and demodulated duly without getting distorted
  4. 4. We need :---- a.An input signal b.Two preemphasizers c.A DSB-SC modulator d.A frequency doubler e.A pilot signal f. A summer g.An FM modulator
  5. 5. Why do we need L + R & L – R?? A mono phonic receiver will work with only the L+R component and there will no loss of AUDIO(so the signal will have the backward compatibility)
  6. 6. We need :---- a. An input signal (through a LIMITER DISCRIMINATOR) b. A Low Pass Filter(0-15 KHz) c. A Bandpass Filter(19 KHz) d. A Bandpass Filter( 23 – 53 KHz) e. A pilot signal f. A Frequency Doubler g. A Synchronous Detector h. Two Deephasizers
  7. 7. Preemphasizer refers to a system process designed to increase, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation distortion or saturation of recording media in subsequent parts of the system.
  8. 8. Deemphasizer refers to a system process designed to decrease, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation distortion or saturation of recording media in subsequent parts of the system.
  9. 9. QUESTIONS ARE WELCOME

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