What is the frequency range in Hz for the POTS signal, regarded as the minimum for human speech?

The frequency range for Plain Old Telephone Service (POTS) that is regarded as the minimum necessary for clear human speech is typically defined as 300 to 3400 Hz. This range is significant because it captures the essential frequencies that contribute to understanding spoken language, including fundamental voice frequencies and harmonics.

In telecommunications, specifically within the context of traditional voice transmission, this frequency range allows for effective communication, ensuring that the critical elements of speech are transmitted clearly and intelligibly. The lower limit of 300 Hz helps filter out non-speech sounds, while the upper limit of 3400 Hz encompasses most of the frequency range of human speech, allowing for the transmission of both consonants and vowels, which are important for comprehension.

Understanding this frequency range is crucial for anyone involved in telecommunications installation, as it is foundational for designing and implementing voice communication systems that meet the standards necessary for effective speech transmission.