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Voltage and Decibels

Voltage and Decibels

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Voltage and Decibels

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  1. Voltage and Decibels • What voltage is represented by +26 dBu? • 0 dBu is 0.775 volts • +20 dBu is ten times the voltage, 6 dBu is twice the voltage • 10 x 2 x 0.775 = 15.5 volts • What voltages are represented by the following decibel values? • -20 dBu • +12 dBu • -14 dBu TA212 - Block 4

  2. Sampling • An 8 volt source was originally sampled using 16 bits per sample. • What will the effective voltage be if the sample size is reduced from 16 bits to • 14 bits • 12 bits TA212 - Block 4

  3. MIDI • What is the effect of these sequences? 144, 60, 64, 64, 64, 67, 64, 176, 120 193, 0, 145, 72, 64, 72, 0, 76, 64, 76, 0, 79, 64, 79, 0, 84, 64, 84, 0 TA212 - Block 4

  4. Running Status • What does the following sequence of MIDI codes mean, and how could Running Status reduce its length? 193, 6, 145, 60, 64, 129, 60, 64, 145, 62, 64, 129, 62, 64, 145, 64, 64, 129, 64, 64 TA212 - Block 4

  5. Parity The following binary numbers represent bytes with even parity. Which appear to have been transmitted correctly, and which not? a) 10010001 b) 00100111 c) 11101101 d) 00011001 TA212 - Block 4

  6. Combinatorial Parity The following binary numbers represent a series of four four-bit samples to which combinatorial, even parity has been applied.One bit is in error. Which bit? 10010 11000 11001 00011 10010 TA212 - Block 4