The technique used to transmit audio signals in television broadcasts is

Television audio in traditional analog TV broadcasts is carried using frequency modulation (FM). Television broadcasting is described as an analog communication medium, where different carrier modulation schemes are used for picture and sound; video commonly uses amplitude/vestigial-sideband methods while audio is placed on a separate subcarrier and FM‑modulated because of its superior noise immunity and higher audio fidelity. Lecture notes and analog-communications summaries list FM/angle modulation as the standard analog technique for audio channels in broadcast systems. Conversely, Pulse Code Modulation (PCM) is a digital sampling method and Time Division Multiplexing (TDM) is a multiplexing scheme, neither being the conventional analog audio-modulation method in classic TV broadcasts [3].

Sources

1. [1] INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII (NCERT 2025 ed.) > Chapter 7: Transport and Communication > Television (T.V.) > p. 83
2. [2] https://imdpune.gov.in/training/icitc/COMMUNICATION%20AND%20ANLOG%20MODULATION.pdf
3. [3] https://www.sciencedirect.com/topics/engineering/pulse-code-modulation