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  2. Voice frequency - Wikipedia

    en.wikipedia.org/wiki/Voice_frequency

    In telephony, the usable voice frequency band ranges from approximately 300 to 3400 Hz. [2] 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.

  3. Vocal range - Wikipedia

    en.wikipedia.org/wiki/Vocal_range

    A voice type is a particular kind of human singing voice perceived as having certain identifying qualities or characteristics; vocal range being only one of those characteristics. Other factors are vocal weight , vocal tessitura , vocal timbre , vocal transition points , physical characteristics, speech level, scientific testing, and vocal ...

  4. Lombard effect - Wikipedia

    en.wikipedia.org/wiki/Lombard_effect

    The Lombard effect or Lombard reflex is the involuntary tendency of speakers to increase their vocal effort when speaking in loud noise to enhance the audibility of their voice. [5] This change includes not only loudness but also other acoustic features such as pitch , rate, and duration of syllables .

  5. Speech transmission index - Wikipedia

    en.wikipedia.org/wiki/Speech_transmission_index

    Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal.

  6. Audio system measurements - Wikipedia

    en.wikipedia.org/wiki/Audio_system_measurements

    The frequency range often specified for audio components is between 20 Hz to 20 kHz, which broadly reflects the human hearing range (the highest audible frequency for most people is less than 20 kHz, with 16 kHz being more typical [4]). Components with 'flat' frequency responses are often described as being linear.

  7. Human voice - Wikipedia

    en.wikipedia.org/wiki/Human_voice

    The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound production in which the vocal folds (vocal cords) are the primary sound source.

  8. Harvard sentences - Wikipedia

    en.wikipedia.org/wiki/Harvard_sentences

    The Harvard sentences, or Harvard lines, [1] is a collection of 720 sample phrases, divided into lists of 10, used for standardized testing of Voice over IP, cellular, and other telephone systems. They are phonetically balanced sentences that use specific phonemes at the same frequency they appear in English.

  9. Vocal resonation - Wikipedia

    en.wikipedia.org/wiki/Vocal_resonation

    The response of the tracheal tree is the same for all pitches except for its own resonant frequency. When this resonant frequency is reached, the response of the subglottic tube is to act as an acoustical impedance or interference which tends to upset the phonatory function of the larynx. Research has placed the resonant frequency of the ...