solve the questions

IC HE MULTFLOR TUPACLE .. . . O O onogoo Figure 16 Experiment 16 - Delta maddation and demodulation Emono Instruments 16-21 28. Turn the Buffer module's Gain control fully anti-clockwise. 29. Without wearing the headphones, plug them into the Buffer module's headphone socket. 30, Put the headphones on. 31, Increase the Buffer module's gain until you can comfortably hear the Tuneable Low-pass Filter module's output. Note: You should be able to hear the copy of the message (ie the 2kHz tone) plus the other frequency components that make up the delta signal's spectral composition (up to about 15kHz which is the Tuneable Low-pass Filter module's maximum cut-off frequency). 32. Slowly reduce the Tuneable Low-pass Filter module's cut-off frequency until the message has been recovered and it sounds like these other frequency components are minimised or completely removed. It should be noted here that the Tuneable Low-pass Filter module on the Telecoms-Trainer 101 is a sophisticated circuit - It's a 9" order active elliptical filter. As delta modulation is often used as a low cost analog-to-digital converter. simpler filters costing less are likely to be used for the demodulator. Such filters have a gentler slope and so don't attenuate signals in the roll-off region as sharply. Question 6 What change to the delta modulator can be made to allow simpler filters to be used by the demodulator without introducing more noise and distortion? Ask the instructor to check your work before continuing. 16-22 2 Emara Instruments Experiment 16 - Delta modulation and demodulation