Experimental Research on Hiding Capacity of Echo Hiding in Voice

Many improvements are developed for echo hiding system, but there is not an intensive study on the hiding capacity of echo hiding. Based on the speech signals with various sampling rate and single echo hiding scheme, this work explores the regular pattern of recovery accuracy and fragment length, and presents that the hiding capacity of speech clip is 55bit/s, and the capacity is not related to the sample frequency of speech signals. Experimental results reveal that the proposed values range of fragment length can yield well performance in recovery accuracy. The results are useful for practical applications.