- Jung-Woo Ku, Austin Kim, Ho-chong Park, Jae-Bum Kim, Chul-Yong Ahn, Pavel Martynovich, "Apparatus and method for recovering voice packet," US Patent, 8,520,536, August 27, 2013.
- Woo-suk Lee, Hochong Park, Chang-yong Son "Wide-band speech signal compression and decompression apparatus, and method thereof," US Patent, 8,433,565, April 30, 2013.
- 박호종 외,“Apparatus for encoding and decoding of integrated speech and audio,” 중국특허, CN102150205, 2013.03.27.
- Hochong Park, Geun-Bae Song, Jae-Bum Kim, “Apparatus and method for forwarding voice packet in a digital communication system,” US Patent, US 8,363,638, Jan. 29, 2013.
- J. H. Kim, Hochong Park, E. M. Oh, “Audio signal quality enhancement apparatus and method,” US Patent, US 8,315,862, Nov. 20, 2012.
- Hochong Park et al.,“Apparatus and method for deciding adaptive noise level for bandwidth extension,” US Patent, US 8,296,157, Oct. 23, 2012.
- Chang-Yong Son, Hosang Sung, Hochong Park, Byounghak Jeong, Youngvo Kim, "Speech signal compression and/or decompression method, medium, and apparatus," US Patent, US 8,019,600, Sept. 13, 2011.
- Chang-Yong Son, Hochong Park, Yong-Beom Lee, Woo-Suk Lee, "Speech compression and decompression apparatuses and methods providing scalable bandwidth structure," US Patent, US 7,624,022, Nov. 24, 2009.
- S. K. Beack, J. Seo, I. Jang, D. Y. Jang, Hochong Park. S. O Kang, Y. C. Park, J. W. Hong, “Loseless audio coding/decoding apparatus and method,” US Patent, US 7,605,722, Oct. 20, 2009.
- Chang-yong Son, Hochong Park, Yong-Beom, and Woo-suk Lee, "Speech compression and decompression apparatuses and methods providing scalable bandwidth structure," European Patent, EP1494211, 2007.01.24.
- Woo-suk Lee, Chang-yong Son, and Hochong Park, "Wide-band speech signal compression and decompression apparatus, and method thereof," European Patent, EP1498874, 2006. 06. 07.
- Hochong Park, Sang-Wook Han, "Apparatus and method for speech recognition of degraded speech by speech codec," WO 2004/114280, 2004.12.29.
- Hochong Park, "Voice coder and method," European Patent, EP0902421, 2002.04.03.
- Hochong Park, Young-ky Kim, "Echo canceler and method thereof," US Patent, US 6,181,794, Jan. 30, 2001.
- Hochong Park, "Method for Improving Performance of a Voice Coder," US Patent, US 6,108,624, August 22, 2000.