A Subjective Method to Estimate the Voice Quality for Speech Watermarking Based on Improved Spread Spectrum Technique
نویسندگان
چکیده
This paper investigates the measure of voice quality for a digital speech watermarking scheme using a subjectivity method. Data rate, inaudibility, and robustness are considered more than voice quality in speech watermarking. Since any technique in speech telecommunication should have acceptable quality, the perceptual measurement of voice quality is seen as an important topic in audio and speech watermarking. The proposed scheme is simulated and then evaluated on the basis of the perceptual quality of received voice (speech) using mean opinion score (MOS) of 40 participants. Experimental results indicate that the average MOS at the receiver end is 2.75 out of 5. The results show that the perceptual audible quality of the proposed algorithm is between poor and fair. Key-Words: Improved spread spectrum, linear predictive (LP), MOS; BCH-code, speech watermarking
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