ECE :: Communication Systems
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Fields are said to be circularly polarised if their magnitudes are
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Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
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In a CD player the speed of CD is
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In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1 < t < t2. This indicates that during this interval
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A fascimile reproduction has a specification of 200 lines per frame, progressive scanning and 5 frames per second. The time to scan one line is
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Consider the following features of monochrome TV
- Number of lines per picture 625
- Interlace ratio 2 : 1
- Aspect ratio 4 : 3
- Channel bandwidth 8 MHz
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In the absence of noise, if C is channel capacity in bits/s, δf is channel bandwidth in Hz and N is number of coding levels. Then
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The open loop gain of an amplifier is 50 but is likely to change by 20%. If negative feedback with β = 0.1 is used, the change in gain will be about
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Audio amplifiers need
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The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be
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