Design and Evaluation of a Personal Digital Assistant-based Research Platform for Cochlear Implants

Ali, Hina; Lobo, Arthur P.; Loizou, Philipos C.

doi:10.1109/tbme.2013.2262712

Cited by 29 publications

(23 citation statements)

References 33 publications

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“…Signal processing was implemented on a Personal Digital Assistant (PDA)-based signal processor (Ali et al, 2011; 2013). This cell-phone-sized, research device functions as the external signal processor for a Cochlear Corporation implant.…”

Section: Methodsmentioning

confidence: 99%

Bimodal Cochlear Implants: The Role of Acoustic Signal Level in Determining Speech Perception Benefit

et al. 2014

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The aim of this project was to determine for bimodal cochlear implant (CI) patients, i.e. patients with low-frequency hearing in the ear contralateral to the implant, how speech understanding varies as a function of the difference in level between the CI signal and the acoustic signal. The data suggest that (1) acoustic signals perceived as significantly softer than a CI signal can contribute to speech understanding in the bimodal condition, (2) acoustic signals that are slightly softer than, or balanced with, a CI signal provide the largest benefit to speech understanding, and (3) acoustic signals presented at maximum comfortable loudness levels provide nearly as much benefit as signals that have been balanced with a CI signal.

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Section: Methodsmentioning

confidence: 99%

Bimodal Cochlear Implants: The Role of Acoustic Signal Level in Determining Speech Perception Benefit

et al. 2014

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“…(7) set H flag = true; (8) set GID = node ID; (9) invite (table's (2) Both wired and wireless communication infrastructure are required.…”

Section: Assumptionsmentioning

confidence: 99%

“…Medical professions may need to monitor the implanted medical devices work as expected on patients; so the implanted devices would constantly transmit physiological signal back to medical data center for diagnosis. Many studies have proposed various solutions for inpatient monitoring and telemedicine [5][6][7][8][9]. The life of wireless implantable medical devices (IMDs) are usually limited by battery life.…”

Section: Introductionmentioning

confidence: 99%

A New Energy Efficient and Reliable MedRadio Scheme Based on Cooperative Communication for Implanted Medical Devices

Hsu

Chiang

Yu³

et al. 2015

International Journal of Distributed Sensor Networks

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The most significant shortcoming of implanted devices is the battery life. With advanced technology, implanted devices can have the capability to communicate with other health-related devices, but this also means the energy consumption requirement is greater than ever. Less power consumption would extend the duration of the batteries of implanted medical devices. In this paper, an energy efficient and reliable communication service device scheme that does not require any modification to the existing wireless network structure or the implanted devices under consideration is proposed. The scheme is intended to save a target device's energy necessary for resending communication signals by introducing a neighbor group header node and cooperative (wearable) nodes. The simulation results show that the scheme would result in energy savings of 70 percent with one or two cooperative nodes as compared with the current best approach.

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“…Subjects were tested using a personal digital assistant-(PDA-) based CI research platform (Ali et al, 2013) in a double-walled sound-proof booth (Acoustic Systems, Inc.). The signals were streamed off-line via the PDA platform and sent directly to the subject's cochlear implant unilaterally.…”

Section: Research Processormentioning

confidence: 99%

“…The parameters d and h were set to 2 and 1.5, respectively. The sampling frequency, frame length and frame shift were 22 050 Hz, 8 ms, and 2 ms, respectively to match the parameters of the ACE strategy used with the PDA platform (Ali et al, 2013). The inverse FFT of theŜðt; f Þ is computed and the enhanced speech is finally re-synthesized using the overlap-add (OLA) method.…”

mentioning

confidence: 99%

Simultaneous suppression of noise and reverberation in cochlear implants using a ratio masking strategy

Hazrati

Sadjadi

Loizou

et al. 2013

The Journal of the Acoustical Society of America

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Cochlear implant (CI) recipients' ability to identify words is reduced in noisy or reverberant environments. The speech identification task for CI users becomes even more challenging in conditions where both reverberation and noise co-exist as they mask the spectro-temporal cues of speech in a rather complementary fashion. Ideal channel selection (ICS) was found to result in significantly more intelligible speech when applied to the noisy, reverberant, as well as noisy reverberant speech. In this study, a blind single-channel ratio masking strategy is presented to simultaneously suppress the negative effects of reverberation and noise on speech identification performance for CI users. In this strategy, noise power spectrum is estimated from the non-speech segments of the utterance while reverberation spectral variance is computed as a delayed and scaled version of the reverberant speech spectrum. Based on the estimated noise and reverberation power spectra, a weight between 0 and 1 is assigned to each time-frequency unit to form the final mask. Listening experiments conducted with CI users in two reverberant conditions (T 60 ¼ 0.6 and 0.8 s) at a signal-to-noise ratio of 15 dB indicate substantial improvements in speech intelligibility in both reverberant-alone and noisy reverberant conditions considered.

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Design and Evaluation of a Personal Digital Assistant-based Research Platform for Cochlear Implants

Cited by 29 publications

References 33 publications

Bimodal Cochlear Implants: The Role of Acoustic Signal Level in Determining Speech Perception Benefit

Bimodal Cochlear Implants: The Role of Acoustic Signal Level in Determining Speech Perception Benefit

A New Energy Efficient and Reliable MedRadio Scheme Based on Cooperative Communication for Implanted Medical Devices

Simultaneous suppression of noise and reverberation in cochlear implants using a ratio masking strategy

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