In a DPCM transmitter, the analog input signal is band limited to one-half the sample rate, then Amplified & compared with the preceding accumulated signal level in the Adder [basically it is subtractor] . The output of the Adder is the difference between the two signals. The difference is PCM encoded and transmitted. The ADC operates the same as in a conventional PCM system, except that it typically uses fewer Bits per sample.
In a DPCM receiver, each sample is converted back to analog , stored, and then summed with the next sample received . In the receiver , the integration is performed on the analog signals , although it could also be performed digitally.
The trainer contains :
- Variable sine Wave Generator.
- Variable DC Source.
- DPCM Modulator.
- DPCM Demodulator.
Additional Accessory Required :
- Dual Trace Oscilloscope