ECE 106 Digital Modulation
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| 🇬🇧 | 🇬🇧 |
| Caused by scratches, fingerprints and so forth | Burst errors |
| Manifestation of errors during playback | Click sound |
| Information bits are often repeated, ex. Long strings of spaces and carriage returns for spreadsheets | Run-length encoding |
| To secure communication | Data Encryption |
| Inverse of encryption process | Decryption |
| Set of transformations | Cipher |
| Similar to convolutional encoding in that small segments of the plaintext are process | Stream Encryption |
| Permutation | Rules where the characters are put in field block lengths and circularly shifter left or right |
| Single-key system developed by Diffie and Hellman (1979) used in banking, credit card operations, electronic fund transfers, etc. | Data Encryption Standard |
| In 1978 public key system based on the inherent difficulty of determining the prime factors of large numbers | Rivest-Shamir-Adleman System |
| With constant use, tapes stretch out and exhibit what? | Wow and flutter |
| Ranges of signal amplitudes | Dynamic Range |
| It has a dynamic range of 100 - 120 dB (for soft music to still be heard and loud music will not saturate the amplifier) | Live orchestra |
| What is the meaning of CD? | Compact Disk |
| Creating pits and lands | Burning the CD |
| List all the CD Characteristics | Diameter – 120 mm no. of tracks - 20,000 track width - 0.5 μm spacing between track - 1.6 μm total track length - 5300 m scan velocity - 1.2 m/s total playing time - 74 minutes |
| White noise is also known as | Dither noise |
| Why is there a need to add white noise? | White noise or Dither noise is added to mask any granular noise |
| It is used to encode parity or check symbols for error correction. | Cross Interleave Reed-Solomon Error Control Code (CIRC) |
| Adds an 8-bit symbol to each 32-symbol data block from the CIRC | Control-Word Module |