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Delta Modulation

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Delta Modulation  :- A delta modulation (DM or Δ-modulation) is an analog-to-digital and digital-to-analog signal conversion technique used for transmission of voice information where quality is not of primary importance. Diagram  :-  Waveform   :- What is Delta Modulation   :- # Delta  modulation has its roots in Differential pulse code modulation method. It is also known as the simplified form of Differential pulse code modulation. Delta modulation is a scheme to permit the use of a simple quantizing strategy for constructing the encoded signals which are over-sampled purposely, to increase the correlation between adjacent samples of the signal, as seen in Differential pulse code modulation method. # This  modulation is also called one bitter two-level version of Differential pulse code modulation. It provides a staircase approximation of over-sampled base-band signal. Here, the difference between the present sample and previous approximated sample is quantize
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TDMA

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TDMA (Time Division Multiple Access):-  Time-division multiple access  ( TDMA ) is a channel access method for shared-medium networks. It allows several users to share the same Frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity . TDMA is used in the digital 2G cellular systems such as Global system for mobile communication (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced CordlessTelecommunications(DECT) standard for portable phones. TDMA was first used in satellite communication systems by Western Union in its Westar 3 communications satellite in 1979. It is now used extensively in satellite communications,combat-net radio systems, and  passive optical network (PON) networks for upstream traffic from
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Bluetooth

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Bluetooth:-        Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.402 GHz to 2.480 GHz, and building personal area networks(PANs). It was originally conceived as a wireless alternative to RS-232 data cables.   Developed by:-  Bluetooth Special Interest                               Group                  Industry:-          Personal area networks  Compatible                                   hardware:-       Personal computers                                        Smartphones Gaming                             Consoles                           Audio devices Physical range:- Typically less than                                           10 m (33 ft), up to 100 m                               (330 ft)                              Bluetooth 5.0: 40–400 m                               (100–1,000 ft)[1
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