Which description matches tone transmission?

Which description matches tone transmission?

• A. A continuous stream of binary bits conveying the measurement.
• B. A pure audible tone whose duration represents a measured value.
• C. A digital packet containing time-stamped data.
• D. A radio frequency carrier with amplitude encoding the value.

Answer: (B)

Tone transmission uses a signal that is a pure tone, and the value is carried by how long that tone lasts. In this scheme, a measurement isn’t sent as bits or as a complex data packet; instead, the duration of the audible tone itself encodes the value. That makes the description of a pure audible tone whose duration represents the measured value the best fit for tone transmission. The other descriptions describe different signaling methods: a continuous stream of binary bits is digital bit signaling, not tone-based; a digital packet with time stamps is structured data framing, not a simple tone; and a radio frequency carrier with amplitude encoding uses amplitude modulation on an RF carrier, not a tone whose duration carries information.

Tone transmission uses a signal that is a pure tone, and the value is carried by how long that tone lasts. In this scheme, a measurement isn’t sent as bits or as a complex data packet; instead, the duration of the audible tone itself encodes the value. That makes the description of a pure audible tone whose duration represents the measured value the best fit for tone transmission.

The other descriptions describe different signaling methods: a continuous stream of binary bits is digital bit signaling, not tone-based; a digital packet with time stamps is structured data framing, not a simple tone; and a radio frequency carrier with amplitude encoding uses amplitude modulation on an RF carrier, not a tone whose duration carries information.