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A Level     Modulation     AM     Digital     FM     PAM     >PCM<     PPM     PWM    

Modulation PCM


Site for Eduqas/WJEC - Go to the AQA site.

  A Level    Modulation  0 of 22    Question 1130    Bandwidth AM Transmissions 
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Deadline not set1 of 22    Question 1129    Bandwidth AM Transmissions 
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Deadline not set2 of 22    Question 1128    Bandwidth AM Transmissions 
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Deadline not set3 of 22    Question 1127    Bandwidth AM Transmissions 
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Deadline not set4 of 22    Question 1131    Bandwidth AM Transmissions 
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Deadline not set5 of 22    Question 1125    Bandwidth AM Transmissions 
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Deadline not set6 of 22    Question 1126    Bandwidth AM Transmissions 
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Deadline not set7 of 22    Question 114    FM Deviation Calculation 
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Deadline not set8 of 22    Question 53    Frequency Bands and Modulation Types 
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Deadline not set9 of 22    Question 109    Modulation - AM Bandwidth Calculation 
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Deadline not set10 of 22    Question 113    Modulation - AM bandwidth Calculation 
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Deadline not set11 of 22    Question 105    Modulation - Analogue Types 
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Deadline not set12 of 22    Question 108    Modulation - Analogue Types 
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Deadline not set13 of 22    Question 106    Modulation - Terminology 
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Deadline not set14 of 22    Question 107    Modulation - Terminology 
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Deadline not set15 of 22    Question 112    Modulation Depth 
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Deadline not set16 of 22    Question 110    Modulation Depth 
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Deadline not set17 of 22    Question 111    Modulation Depth Calculation 
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Deadline not set18 of 22    Question 1260    Radio Systems 
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Deadline not set19 of 22    Question 1259    Radio Systems 
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Deadline not set20 of 22    Question 307    Sub-systems 
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Deadline not set21 of 22    Question 50    Transmitter Basics 
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Deadline not set22 of 22    Question 51    Transmitter Terminology 
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Deadline not set  Questions 0 to 22   -->  View All  

Pulse Code Modulation

At the transmitter, the information signal is contverted into binary numbers (ADC).
At the receiver, the numbers are converted back to an analogue signal (DAC).

Encoding and Transmitting

PCM Transmitter System Diagram

Pulse Code Modulation

Receiving and Decoding

SIPO Shift Register with DAC

Pulse Code Modulation Reconstruction

Little and Big-Endian

Wars have started over less controversial topics.
In the PCM diagrams, 3 was converted into 011.
The war is about whether the most or least significant bit should be transmitted first using a serial link.

Endianness on Wikipedia

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