Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-007-004
Combien de bits sont requis pour obtenir 256 niveaux distincts, ou un rapport de 256 pour 1?
- A16 bits
- B4 bits
- C8 bits
- D6 bits
Correct answer: C — 8 bits. Question tirée de la banque officielle d'ISDE.
Why
Eight bits are needed because each bit doubles the number of possible states, and multiplying two by itself eight times equals exactly 256 distinct levels. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
Drill A-005 — free, no account