What is voice and speech?
Regarding this, what does voice mean in speech?
Voice is the sound produced by the larynx or voice-box. Voice is not always produced as speech. For example, infants can babble and coo and most people produce sound when they laugh. Your voice is your unique signature; it reflects your personality, your mood, and your auditory identity.
Keeping this in consideration, what is voice pitch?
Pitch is an integral part of the human voice. The pitch of the voice is defined as the "rate of vibration of the vocal folds" . The sound of the voice changes as the rate of vibrations varies. As the number of vibrations per second increases, so does the pitch, meaning the voice would sound higher.
Only its outer covering vibrates. Biologically, the larynx evolved as a valve to protect the airway and lungs. Thus, it is positioned where the airway and the esophagus separate. The vocal folds open to allow breathing and close during swallowing to prevent food from entering into the lungs and during voicing.