Coding & Classification Systems Flashcards

Which coding scheme is used in CD-ROM data encoding to ensure sufficient bit transitions for clock recovery?

Answer: Eight-to-Fourteen Modulation (EFM)

CD-ROMs use Eight-to-Fourteen Modulation (EFM), which maps each 8-bit byte to a 14-channel bit pattern guaranteeing minimum run lengths for reliable clock recovery.

In a standard UPC-A barcode, how many digits does the barcode encode in total?

Answer: 12

UPC-A encodes 12 digits: a 1-digit number system, 5-digit manufacturer code, 5-digit product code, and 1 check digit.

What is the purpose of the parity bit added to a 7-bit ASCII character to form an 8-bit byte?

Answer: To enable single-bit error detection

A parity bit is appended to ASCII data to allow detection of single-bit transmission errors by making the total number of 1-bits either even or odd.

In the Surface Mount Device (SMD) capacitor marking system, a capacitor marked '104' has a value of:

Answer: 100 nF

SMD capacitor code 104 means 10 × 10⁴ pF = 100,000 pF = 100 nF = 0.1 µF.

Which coding system assigns unique numeric identifiers to ICs based on function and is maintained by JEDEC for memory devices?

Answer: JEDEC JEP106

JEDEC JEP106 maintains the manufacturer identification code standard, while JEDEC also maintains memory device standards that assign part numbers based on speed, capacity, and organization.

In binary arithmetic, what is the result of 1010 + 0111?

Answer: 10001

1010 (10 decimal) + 0111 (7 decimal) = 10001 (17 decimal); the carry from the MSB produces a 5-bit result.

What does the 'C' designation mean in a Pro Electron transistor part number such as BC547?

Answer: The device is an audio-frequency transistor

In Pro Electron, 'B' = silicon and 'C' = low-power audio-frequency transistor; BC547 is therefore a silicon AF small-signal transistor.