A phase modulated wave can be generated from frequency modulator by connecting a ___________ before the modulator and a frequency modulated wave can be generated from phase modulator by connecting a __________ before the modulator.

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  1. Differentiator, integrator
  2. differentiator, high-pass filter
  3. integrator, low-pass filter
  4. integrator, differentiator

Answer (Detailed Solution Below)

Option 1 : Differentiator, integrator
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FM मॉड्यूलेटर का आउटपुट निम्न रूप का होता है

s(t)=Accos(ωct+kfmtm(τ)dτ)

अवकलक के माध्यम से मॉड्यूलेटिंग सिग्नल पारित करने के बाद हम आवृत्ति मॉड्यूलेटर के इनपुट के रूप में ddtm(t) देते हैं

sdfs

आउटपुट सिग्नल की अभिव्यक्ति होगी:

s(t)=Accos(ωct+ddt(kfmtm(τ)dτ))

समाकल का अवकलन केवल मूल सिग्नल देगा।

हमें एक फेज मॉडुलित सिग्नल मिलता है जो इस रूप का होता है:

s(t)=Accos(ωct+kpm(t))

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