High-quality and low-complexity real-time voice changing with seamless switching for digital imaging devices

Abstract

In this paper, we propose a voice changing method to provide a seamless switchable function with a low computational complexity for digital imaging devices. The proposed method combines a waveform similarity overlap-and-add (WSOLA) algorithm with a sampling rate changing technique that operates in the time domain. In addition, the proposed method includes a noise technique in the region where the voice changing switching mode changes from on to off, and vice versa. We finally compare the performance of the proposed method with that of a conventional one in terms of the processing time and speech quality. It is shown from the experiments that the proposed voice changing method gives a relative complexity reduction of 84.5% in a resource-constrained device having an ARM processor and is more preferred than the conventional method by 76%. © 2011 Springer-Verlag.