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www.reference.com/science/frequency-range-human-speech-3edae27f8c397c65

The average frequency range for human speech varies from 80 to 260 Hertz. The vocal speech frequency of an adult male ranges from 85 to 180 Hertz, while the frequency of an adult female ranges from 165 to 255 Hertz. According to Wikipedia, the fundamental frequency of speech falls between this bandwidth.

en.wikipedia.org/wiki/Voice_frequency

Frequency band. In telephony, the usable voice frequency band ranges from approximately 300 to 3400 Hz. It is for this reason that the ultra low frequency band of the electromagnetic spectrum between 300 and 3000 Hz is also referred to as voice frequency, being the electromagnetic energy that represents acoustic energy at baseband.

www.seaindia.in/human-voice-frequency-range

Starting with the main frequency range, it is the frequency range of human hearing, which is responsible for the perception of speech. It covers the frequencies from 300 to 3000 Hz. The range of frequencies in which the intelligibility and the recognition of the tuning characteristics are concerned is between the above mentioned frequency.

www.researchgate.net/post/What_is_the_frequency_range_of_human_speech_sounds

Can anybody tell me the frequency range of human speech sounds (vowels AND consonants)? I read somewhere that it is between 80 - 20000 Hz but I need a reliable source to cite.

dsp.stackexchange.com/questions/36505/what-is-the-bandwidth-of-human-speech

Telephone range (300 Hz-3.4 kHz) has okay intelligibility but the quality of the voice is fairly compromised. For example it's hard to tell the difference between "s" and "f" sounds. 80 Hz to 8 kHz gives you very good quality, although it's still possible for the human voice to make sounds outside of this range.

www.bnoack.com/audio/speech-level.html

The individual human voice is characterized by these boosted areas in the frequency response of a single voice for each single tone. Speech formants are areas withion the frequency spectrum that are energetically higher than the average. These areas are typically for the different vowels in human speech.

physics.stackexchange.com/.../what-is-the-meaning-of-frequency-of-a-human-voice

According to the Wikipedia article about voice frequency: "The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz." That is, the frequency ranges (of the fundamental frequency) are about an octave apart, for males and females.

en.wikipedia.org/wiki/Audio_frequency

An audio frequency or audible frequency (abbreviation: AF) is a periodic vibration whose frequency is in the band audible to the average human, the human hearing range. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. The generally accepted standard hearing range for humans is 20 to 20,000 Hz.

www.dpamicrophones.com/mic-university/facts-about-speech-intelligibility

Furthermore, the 1-4 kHz frequency range should be “kept clear”. When, for instance, adding music as background for narration, a parametric equalizer cutting the music 5-10 dB in this frequency range will improve intelligibility. Reverberation Reverberation is considered noise when talking about speech intelligibility.

www.cochlea.org/en/hear/human-auditory-range

The human ear as a dyamic range from 0dB (threshold) to 120-130 dB. This is true for the middle frequency range (1-2 kHz). For lower or higher frequencies, the dynamic is narrowed. However, as shown on this graph, all sounds above 90 dB are damaging the inner ear and even doing irreversible damage above 120 dB. (see " Noise: watch out ! Danger !")