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23 Mar 2020
Touch-Tone Telephone: When a key is pressed on a touch – tone telephone, the keypad generates two pure tones, which combine to produce a sound that uniquely identify the key. The figure shows the low frequency and the high frequency associated with each key. Pressing a key produces the sound wave .
Use a Sum-to-Product Formula to express the sound generated by the key as a product of a sine and cosine function.
Touch-Tone Telephone: When a key is pressed on a touch – tone telephone, the keypad generates two pure tones, which combine to produce a sound that uniquely identify the key. The figure shows the low frequency and the high frequency associated with each key. Pressing a key produces the sound wave .
Use a Sum-to-Product Formula to express the sound generated by the key as a product of a sine and cosine function.
Jean KeelingLv2
25 May 2020