Audio signal processing circuit for changing the pitch of recorded speech

摘要

A memory has storage segments at different addresses respectively. A write address signal represents an address which is periodically updated at a first frequency. Samples of an audio signal are sequentially written into storage segments of the memory at addresses represented by the write address signal respectively. A read address signal represents an address which is periodically updated at a second frequency lower than the first frequency. Samples of the audio signal are sequentially read out from storage segments of the memory at addresses represented by the read address signal respectively. After the address represented by the write address signal overtakes the address represented by the read address signal and until the address represented by the read address signal reaches the address represented by the write address signal which occurs when the address represented by the write address signal overtakes the address represented by the read address signal, inhibition is given of writing of samples of the audio signal into storage segments of the memory at addresses different from the address represented by the write address signal which occurs when the address represented by the write address signal overtakes the address represented by the read address signal.