Question

difference between pitch and timbre

Answer 1

Pitch - How the brain interprets an emitted sound is known as pitch.
The higher the frequency , the higher is the pitch

Timbre - Timbre or quality of a sound helps us to differentiate or distinguish between different sound sources which are producing sound at the same pitch and loudness.

Answer 2

 
Pitch
Pitch is the quality of sound which makes some sounds seem "higher" or "lower" than others. Pitch is determined by the number of vibrations produced during a given time period. The vibration rate of a sound is called its frequency the higher the frequency the higher the pitch. Frequency is often measured in units called Hertz (Hz). If a sound source vibrates at 100 vibrations per second, it has a frequency of 100 Hertz (100 Hz). Mels scale would be found here. The average person can hear sound from about 20 Hz to about 20,000 Hz. The upper frequency limit will drop with age. 
 The human ear is very adept at filling gaps. There is a body of evidence to show that if the lowest frequency partial is missing from a complex tone, the ear will attempt to fill it in. This effect is used, for instance, by church organists who simulate the effect of say a low ‘C’ for which they do not have a pipe of sufficient size by playing the ‘C’ and ‘G’ an octave above. These two pipes provide all the partials for the lower ‘C’ note except for the lowest frequency, which the ear obligingly provides. Listening to speech or music on a poor quality transistor radio that cannot reproduce low frequencies provides another example. The programme is rendered intelligible by the ear filling in the lowest partial tones. That rapid speech is intelligible suggests that the synthesis in the ear is practically instantaneous.
Timbre
Timbre is a French word that means "tone color". It is pronounced: tam' ber. Timbre is the quality of sound which allows us to distinguish between different sound sources producing sound at the same pitch and loudness. The vibration of sound waves is quite complex; most sounds vibrate at several frequencies simultaneously. The additional frequencies are called overtones or harmonics. The relative strength of these overtones helps determine a sound's timbre.

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