## 3 Reversible Watermarking Based on intDCT
### Extracting Embedded Information and Reconstructing Original Data
There was no overlap between these two methods regarding segSNR, which means that the proposed method achieved a smaller difference between the stego and original data in the time domain. Due to the concentration of hiding locations in the high-frequency band, there is a risk that the hiding positions may be detected according to the borderline by spectrum analysis. To protect the hiding locations and achieve better audio quality, a more sophisticated algorithm is to be proposed for exploring adaptive hiding locations with distortion estimation. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app14072757/s1](https://www.mdpi.com/article/10.3390/app14072757/s1)]([https://www.mdpi.com/article/10.3390/app14072757/s1](https://www.mdpi.com/article/10.3390/app14072757/s1)), original audio: Ja_m5.wav; stego audio: Ja_m5.9-16.wav. Conceptualization, X.H. and A.I. ; methodology, X.H. ; formal analysis, X.H. and A.I. ; investigation, writing--original draft preparation, X.H. ; writing--review and editing, A.I. ; visualization, X.H. and A.I. ; supervision, A.I. ; project administration, X.H. and A.I. ; funding acquisition, X.H. and A.I. All authors have read and agreed to the published version of the manuscript. This work was supported by JSPS KAKENHI Grant Number JP18K18052. Not applicable. The speech data used in this paper were ITU-T P50: Artificial voices, which can be downloaded from [[https://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm](https://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm)]([https://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm](https://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm)), accessed on 5 March 2024. The music data were downloaded from YouTube as follows: [PERSON]--Fuguet in G minor BWV 578: [[https://www.youtube.com/watch?v=PhRa3](https://www.youtube.com/watch?v=PhRa3) REdozw]([https://www.youtube.com/watch?v=PhRa3](https://www.youtube.com/watch?v=PhRa3) REdozw), accessed on 5 March 2024; [PERSON]--Moonlight Sonata: [[https://www.youtube.com/watch?v=4T00](https://www.youtube.com/watch?v=4T00) tiQuU]([https://www.youtube.com/watch?v=4T00](https://www.youtube.com/watch?v=4T00) tiQuU), accessed on 5 March 2024; [PERSON]--Take Five: [[https://www.youtube.com/watch?v=vmDDOFKSgAs](https://www.youtube.com/watch?v=vmDDOFKSgAs)]([https://www.youtube.com/watch?v=vmDDOFKSgAs](https://www.youtube.com/watch?v=vmDDOFKSgAs)), accessed on 5 March 2024; [PERSON]--Giant Steps: [[https://www.youtube.com/watch?v=h6](https://www.youtube.com/watch?v=h6) NC&wcrC4]([https://www.youtube.com/watch?v=h6](https://www.youtube.com/watch?v=h6) NC&wcrC4), accessed on 5 March 2024; Wah Wah World: [[https://www.youtube.com/watch?v=kJ9](https://www.youtube.com/watch?v=kJ9) VK6 owG8]([https://www.youtube.com/watch?v=kJ9](https://www.youtube.com/watch?v=kJ9) VK6 owG8), accessed on 5 March 2024; DUNE ft. [PERSON]: [[https://www.youtube.com/watch?v=AS4q9](https://www.youtube.com/watch?v=AS4q9) ywJkJ]([https://www.youtube.com/watch?v=AS4q9](https://www.youtube.com/watch?v=AS4q9) ywJkJ), accessed on 5 March 2024. We thank [PERSON] from National Institute of Informatics, [PERSON] from Tokyo Metropolitan University, and [PERSON] from Tokyo University of Information Sciences for there advice and support. The authors declare no conflicts of interest. * [PERSON] et al. (2016) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON], [PERSON] Efficient audio integrity verification algorithm using discrete cosine transform. _Int. J. Speech Technol._**2016**, 19, 1-8. [CrossRef]
* [PERSON] et al. (2011) [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] A Reversible Acoustic Steganography for Integrity Verification. In _Digital Watermarking. IWDW 2010_; Lecture Notes in Computer Science; Springer: Berlin/Heidelberg, Germany, 2011; Volume 6526, pp. 305-316. [CrossRef]
* [PERSON] et al. (2017) [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] Reversible Audio Information Hiding for Tampering Detection and Localization Using Sample Scanning Method. _J. Inf.