Which of the following statements is true regarding DTMF?

Which of the following statements is true regarding DTMF?

• A. It is primarily used for voice communications
• B. It uses single tone frequencies
• C. It can be used to access automated systems
• D. It is not necessary for modern radios

Answer: (C)

DTMF, or Dual-Tone Multi-Frequency, is a signaling system that plays a crucial role in telecommunications, particularly for access to automated systems. When a user presses a key on a telephone keypad, the corresponding DTMF signal comprises two distinct audio tones that are generated simultaneously. This dual-tone system allows for reliable transmission of data over voice channels, making it ideal for tasks such as navigating menus in voicemail systems, banking systems, or various customer service applications where automated responses are involved. The ability for DTMF to effectively interact with these automated systems is one of its key strengths, as it enables users to input commands or selections without needing a direct connection to a person. In contrast, the other statements do not accurately represent DTMF’s characteristics or applications. Voice communications are not its primary function, single tone frequencies do not describe how DTMF operates, and while modern radios may not always rely on DTMF, stating it is unnecessary overlooks its practical uses in various systems even today.

DTMF, or Dual-Tone Multi-Frequency, is a signaling system that plays a crucial role in telecommunications, particularly for access to automated systems. When a user presses a key on a telephone keypad, the corresponding DTMF signal comprises two distinct audio tones that are generated simultaneously. This dual-tone system allows for reliable transmission of data over voice channels, making it ideal for tasks such as navigating menus in voicemail systems, banking systems, or various customer service applications where automated responses are involved.

The ability for DTMF to effectively interact with these automated systems is one of its key strengths, as it enables users to input commands or selections without needing a direct connection to a person. In contrast, the other statements do not accurately represent DTMF’s characteristics or applications. Voice communications are not its primary function, single tone frequencies do not describe how DTMF operates, and while modern radios may not always rely on DTMF, stating it is unnecessary overlooks its practical uses in various systems even today.