What do you mean by companding, Electrical Engineering

Assignment Help:

Q. What do you mean by Companding?

Companding is the process of compressing and expanding. It comprises compressing the signal at the transmitter and expanding it at the receiver. The modulating signal to be transmitted is passed through an amplifier that has correctly adjusted non linear transfer characteristic, favouring small amplitude signals. These are artificially large when they are quantized and so the effect of quantizing noise upon them is reduced. Correct amplifier relations are restored at the receiver by expander. It's desirable to agree to some standard for companding in order to realize hardware efficiencies and to permit receiving and sending by a variety of users. The most common application of companding is in voice transmission. Japan and North America have adopted a standard compression curve called µ law companding. Law µ companding formula is given by

Vout= ( Vmax X In (1+ µ Vin / Vmax) / In (1+ µ)

 Where

 VMAX= Maximum uncompressed modulating input amplitude.

 VIN = Amplitude of the input signal at particular instant at time

 

µ = Parameter used to define the amount of compression

 Vout= Compressed output voltage.

2008_What do you mean by Companding.png


Related Discussions:- What do you mean by companding

Determine the output voltage increment, (a) Design a 6-bit R-2 R ladder D/A...

(a) Design a 6-bit R-2 R ladder D/A converter. (b) For V ref = 10 V, find the maximum output voltage. (c) Determine the output voltage increment. (d) If the output voltag

Find the maximum radiation intensity, Q. An antenna has beam widths of 3° a...

Q. An antenna has beam widths of 3° and 10° in orthogonal planes and has a radiation ef?ciency factor of 0.6. Find the maximum radiation inten- sity if 1 kW is applied to the anten

What is the basic principle of oscillators, Q. What is the basic principle ...

Q. What is the basic principle of oscillators?  In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy

Sketch a graph comparing the fcc class, a) In the United States, the Federa...

a) In the United States, the Federal Communications Commission (FCC) is charged with the regulation of radio and wire communication (FCC part 15). It basically sets limits on the

Explain the architecture of 8085, Explain the Architecture of 8085. Ø  ...

Explain the Architecture of 8085. Ø  ALU Ø  Interrupt control Ø  Serial I/O control Ø  Timing and control unit Ø  Instruction Register & Decoding

Transformers, determine the efficience of a 16 KVA transformer for the full...

determine the efficience of a 16 KVA transformer for the full-load,unit power factor

Determine the laplace transform of the given functions, Q. Determine the La...

Q. Determine the Laplace transform for each of the following functions from the basic de?nition of Equation. (a) f 1 (t) = u(t) (b) f 2 (t) = e-at (c) f 3 (t) = df (t) dt,

Dc link scherbius drive - motor control , DC Link Scherbius Drive This ...

DC Link Scherbius Drive This type of scheme is shown in figure. This circuit  allows both  sub synchronous  and super synchronous speed control. In case  of sub synchronous spe

Regions of operation, Regions of operation: Applied volta...

Regions of operation: Applied voltages Mode E Forward active E C Saturation E > B

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd