{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T10:38:35Z","timestamp":1777891115744,"version":"3.51.4"},"reference-count":41,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2021,3,25]],"date-time":"2021-03-25T00:00:00Z","timestamp":1616630400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["THC"],"published-print":{"date-parts":[[2021,3,25]]},"abstract":"<jats:p>BACKGROUND AND OBJECTIVE: Recently, with the increase in the population of hearing impaired people, various types of hearing aids have been rapidly developed. In particular, a fully implantable middle ear hearing device (F-IMEHD) is developed for people with sensorineural hearing loss. The F-IMEHD system comprises an implantable microphone, a transducer, and a signal processor. The signal processor should have a small size and consume less power for implantation in a human body. METHODS: In this study, we designed and fabricated a signal-processing chip using the modified FFT algorithm. This algorithm was developed focusing on eliminating time delay and system complexity in the transform process. The designed signal-processing chip comprises a 4-channel WDRC, a fitting memory, a communication 1control part, and a pulse density modulator. Each channel is separated using a 64-point fast Fourier transform (FFT) method and the gain value is matched using the fitting table in the fitting memory. RESULTS AND CONCLUSION: The chip was designed by Verilog-HDL and the designed HDL codes were verified by Modelsim-PE 10.3 (Mentor graphics, USA). The chip was fabricated using a 0.18 \u03bcm CMOS process (SMIC, China). Experiments were performed on a cadaver to verify the performance of the fabricated chip.<\/jats:p>","DOI":"10.3233\/thc-218038","type":"journal-article","created":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T13:13:57Z","timestamp":1614690837000},"page":"399-413","source":"Crossref","is-referenced-by-count":2,"title":["Implementation of a fully implantable middle-ear hearing device chip"],"prefix":"10.1177","volume":"29","author":[{"given":"Jyung Hyun","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering, School of Medicine, Kyungpook National University, Daegu, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dong Wook","family":"Kim","sequence":"additional","affiliation":[{"name":"Gyeongbuk Branch Office, Korea Testing Certification, Daegu, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ki Woong","family":"Seong","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Kyungpook National University Hospital, Daegu, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Myoung Nam","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, School of Medicine, Kyungpook National University, Daegu, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin-Ho","family":"Cho","sequence":"additional","affiliation":[{"name":"Institute of Biomedical Engineering Research, Kyungpook National University Korea, Daegu, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","reference":[{"key":"10.3233\/THC-218038_ref1","unstructured":"Dillon H. 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