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Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ? 
A GSM cellular telephone standard requires a minimum of 9 dB rejection of interfering signal levels of -23 dBm at 3 MHz from the carrier, -33 dBm at 1.6 MHz from the carrier, and -43 dBm at 0.6 MHz from the carrier, for a carrier level of -99 dBm. Determine the required local oscillator phase noise at 3 MHz carrier frequency offset.
Which of the following is/are correct? 1. Detection is the process of recovering the modulating signal from the modulated carrier wave. 2. The carrier frequency is usually changed to a lower frequency by what is called an intermediate frequency (IF) stage preceding the detection.
In an AM system receiver. the mixer translates the carrier frequency fc to a fixed intermediate frequency of 450 kHz. Given a broadcast signal of frequency 900 kHz. What is the corresponding image frequency when a superhetrodyne receiver is employed with local oscillator frequency greater than the broadcast signal frequency?
If a modulating signal with frequency fm amplitude modulates a carrier of frequency fc (where fc ≫ fm), the frequencies present at the output of AM is/are (with carrier).
A DSB-SC signal is generated using the carrier signal cos (ωct + θ) and modulating signal m(t). What is the envelope detector output of this DSB-SC signal?
In frequency modulation, the amplitude of modulated carrier signal is ______and its frequency is ______ by the modulating message signal.
The frequency of modulating signal has no effect on the amount of frequency deviation of a carrier signal in FM.
What is the upper sideband frequency if the carrier frequency and the modulating signal frequency is 30 KHz and 80 Hz respectively?
What is the maximum carrier frequency to be used if the upper limit frequency that is available is 4000Hz and the frequency of the modulating signal is 100Hz?