Pulse Code Modulation (PCM) | Advantages and Disadvantages of PCM | (Includes Video)

Pulse Code Modulation (PCM) is the digital form of pulse modulation technique. This form of pulse modulation technique is known as Pulse Code Modulation (PCM). Pulse code modulation is a technique to convert analog signals into digital signals.

Pulse Code Modulation (PCM) Video

 

After converting the signal into digital form, it becomes possible to transmit the digital signal through digital communication network and at the receiving end, it is converted back into it's original analog form.

Pulse code modulation process involves the following three stages -

1.Sampling of the signal

2.Quantization and

3.Coding

Advantages of Pulse Code Modulation (PCM)

1.Very high noise immunity
2.In pulse code modulation repeaters are used between the transmitter and receiver. Repeaters are used to regenerate the received PCM signal. Use of repeaters is possible due to digital nature of the signal.
3.Effect of noise is further reduced due to the use of repeaters.
4.Due to its digital nature we can easily store PCM signals.
5.One more advantage of using PCM is security of the signal. We can use various kinds of coding techniques so that only the desired person can decode the received signal.

Disadvantages of Pulse Code Modulation (PCM)

1.Pulse code modulation requires large bandwidth as compared to other techniques.
2.The encoding, decoding and quantizing circuitry of PCM is quite complex.

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Need and benefits of modulation
Pulse modulation techniques (PAM, PWM, PPM, PCM)
Comparison of PAM, PWM, PPM modulation techniques
Pulse amplitude modulation (PAM)
Pulse width modulation (PWM)
Pulse position modulation (PPM) 
Pulse code modulation (PCM) advantages and disadvantages
Pulse code modulation (PCM) vs differential pulse code modulation (DPCM)
Sampling theorem and reconstruction (sampling and quantization)