In the PAL-B/G conventional analog television system, the technique used to…

Concept

In analog broadcasting, modulation places a baseband information signal onto a radio-frequency carrier. Amplitude modulation changes carrier amplitude, whereas frequency modulation changes instantaneous carrier frequency.

Amplitude noise directly alters an AM waveform. An FM receiver can limit amplitude variations before demodulation, so FM provides stronger noise immunity for an audio channel.

Application

The question specifies the PAL-B/G conventional analog television system. This system uses separate picture and sound carriers: the picture carrier uses vestigial-sideband amplitude modulation, while the sound carrier uses frequency modulation.

Contrast

• Amplitude Modulation: vestigial-sideband AM carries the picture information in conventional analog television.

• Pulse Code Modulation: PCM converts sampled audio into digital code words; it is an encoding method used in digital systems.

• Time Division Multiplexing: TDM allocates time slots among signals; it is a multiplexing method rather than carrier modulation.

Cross-check and result

For PAL-B/G, tracing the sound path gives baseband audio → frequency variation of the sound carrier → FM demodulation at the receiver. Therefore, the required technique is Frequency Modulation.