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Encoders and decoders virtually span more than half the field of digital communications. A good starting point would be to learn all the modulation schemes, such as BPSK, QPSK, MPSK, QAM, PCM, DPCM etc. Then you touch upon implmentation, which is based mostly on correlators, matched filters and delay blocks. Lastly, you touch upon synchronization and sampling issues.
Your question is just too wide for a forum posting.
well...i'm thinking of a system for a project. basically the idea goes like this: for the transmission part; it consists of RF Tx module, encoder and dip switch. the dip switch will set the transmitter address, rite ? this address has to match with the address of the decoder circuit at the Rx.
at the Rx, it will receive the data/signal from the Tx. if no error or unmatched address, the data/signal will be decoded by the decoder. the data will be filtered & stabilized. then the data/signal will be used as the i/p (to the microcontroller) to trigger some control unit.
since my knowledge is limited on this, the questions are:
a)is it the encoder/decoder is for security only...in term of receiving only the correct signal & to prevent the interference of unwanting signal for the above situation ?
b)how bout the dip switch ? i'm kind of blur bout it.how it works actually...with the encoder/decoder..in term of the setting certain address for the signal (RF).
You may have got confused with the terms. Encoders/Decoders are normally used to convert bit signals into the actual signals that you transmit, and vice versa, nothing to do with encryption in general, more a matter of sharing available bandwidths effectively without interfering with each other.
If you refer to the OSI layer in the following link, https://www.webopedia.com/quick_ref/OSI_Layers.asp
Encoders/Decoders sit on the data link layer. Address matching and error checking would sit in the MAC and LLC sublayers. Encryption and source coding (aka compression) sits on the presentation layer.
Wireless transceiver ICs generally deal with the data link and LLC. MAC is usually implemented by software.
Does encoder/decoder include modulator/demodulator in RF technology?
I know that encoder/decoder just convert the digital signal into the format that mcu can use and vice versa.
But it seems RF ICs don't work like that.
there are many encoding scemes and many encding decoding techniques
do u ever heard NRZ L, RZ .bipolar RZ manchester encoding
these are the techniques that are use to convet or encode the datra to be tranmitted
I am writng C programming for 8051. i haveproblem with 4X4 matrix keyboard it having Encoder interrupt from 74HCT21. pls help me how to enable the interrupt.
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