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6.delta Modulation

The document describes an experiment to construct and test a delta modulation system. It consists of a delta modulator circuit to encode an analog input signal into a digital bit stream, and a demodulator circuit to reconstruct the analog signal from the digital bit stream. The experiment involves applying different input signals, observing the output waveforms on an oscilloscope, and verifying that the demodulator reconstructs the original signals within the given time periods and amplitudes.

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Shathis Kumar
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121 views3 pages

6.delta Modulation

The document describes an experiment to construct and test a delta modulation system. It consists of a delta modulator circuit to encode an analog input signal into a digital bit stream, and a demodulator circuit to reconstruct the analog signal from the digital bit stream. The experiment involves applying different input signals, observing the output waveforms on an oscilloscope, and verifying that the demodulator reconstructs the original signals within the given time periods and amplitudes.

Uploaded by

Shathis Kumar
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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Exp.No.

6 AIM:

DELTA MODULATION

To construct a delta modulator and demodulator circuit and to study its working. EQUIPMENTS REQUIRED: 1. 2. 3. 4. 5. Delta modulator Kit. CRO (0-20) MHz. Signal generator (0-2) MHz. Probes. Connecting wires.

THEORY: Delta modulation transmits only one bit per sample, that is the present sample value compared with the previous sample value is the indication, whether the amplitude is increased or decreased is sent. Input signal x(t) is approximated to step signal by the delta modulation. The step size is fixed. The difference between the input signal x(t) and staircase approximated signal confined to two levels i.e z and +z. If the difference is positive, then approximated signal is increased by one step in. The difference is if negative, the approximated signal is reduced by z. when the step is reduced,0 is transmitted and if the step is increased 1 is transmitted. The error between the sampled value of x(t) and the last approximated sample is given by e(nTs)= x(nTs)-x(nTs) Where, e(nTs)= error at present sample. x(nTs)= sample signal of x(t). x(nTs)= last sample approximation of staircase waveform. PROCEDURE: 1. Connections are given as per the circuit diagram. 2. A square with amplitude of about 10V and frequency 10KHz is applied as clock input. 3. A sine wave with 200Hz and 3V is applied as message signal. 4. The quantizer outputs and sampler are observed in the CRO. 5. The message frequency is set to 1KHz and the steps 4 and 5 are repeated. 6. The message m(t) and its estimate are observed in the CRO. 7. The various waveforms are obtained.

DELTA MODULATOR BLOCK DIAGRAM:

Circuit diagram:

Model Graph:

TABULATION: SIGNAL AMPLITUDE(V) TIME PERIOD(ms)

RESULT: Thus the delta modulator and demodulator circuits are constructed and the outputs are observed.

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