The rehabilitation of aphasics is fundamentally based on the assessment of speech impairment. Dev... more The rehabilitation of aphasics is fundamentally based on the assessment of speech impairment. Developing methods for assessing speech impairment automatically is important due to the growing number of stroke cases each year. Traditionally, aphasia is assessed manually using one of the well-known assessment batteries, such as the Western Aphasia Battery (WAB), the Chinese Rehabilitation Research Center Aphasia Examination (CRRCAE), and the Boston Diagnostic Aphasia Examination (BDAE). In aphasia testing, a speech-language pathologist (SLP) administers multiple subtests to assess people with aphasia (PWA). The traditional assessment is a resource-intensive process that requires the presence of an SLP. Thus, automating the assessment of aphasia is essential. This paper evaluated and compared custom machine learning (ML) speech recognition algorithms against off-the-shelf platforms using healthy and aphasic speech datasets on the naming and repetition subtests of the aphasia battery. Co...
ABSTRACT A technique used for designing radar poly-phase codes, is used to design mismatched filt... more ABSTRACT A technique used for designing radar poly-phase codes, is used to design mismatched filters for long-range active sonar systems, where transmit waveforms are Doppler-sensitive. The long ranges and operational scenarios involved mean that only single-ping operations are considered. The waveforms under consideration are long-duration Cox combs and sinusoidally frequency modulated (SFM) pulses, arbitrarily selected to occupy the frequency range 1 to 2 kHz. When used in conjunction with a matched filter, these waveforms offer an attractive Doppler resolution, but suffer from significant range sidelobes. The proposed mismatched filters attempt to improve their range resolution or lower their sidelobes across the zero-Doppler region of the range-Doppler domain. The designed cross-ambiguity functions achieve range sidelobes lower than −32.5 dB for the Cox comb, and −33.0 dB for the SFM pulse, as well as acceptable Doppler sidelobes at non-zero delays. This comes at a price of a signal-to-noise ratio (SNR) loss of 18.5 dB for the Cox comb, and 20.5 dB for the SFM pulse.
The rehabilitation of aphasics is fundamentally based on the assessment of speech impairment. Dev... more The rehabilitation of aphasics is fundamentally based on the assessment of speech impairment. Developing methods for assessing speech impairment automatically is important due to the growing number of stroke cases each year. Traditionally, aphasia is assessed manually using one of the well-known assessment batteries, such as the Western Aphasia Battery (WAB), the Chinese Rehabilitation Research Center Aphasia Examination (CRRCAE), and the Boston Diagnostic Aphasia Examination (BDAE). In aphasia testing, a speech-language pathologist (SLP) administers multiple subtests to assess people with aphasia (PWA). The traditional assessment is a resource-intensive process that requires the presence of an SLP. Thus, automating the assessment of aphasia is essential. This paper evaluated and compared custom machine learning (ML) speech recognition algorithms against off-the-shelf platforms using healthy and aphasic speech datasets on the naming and repetition subtests of the aphasia battery. Co...
ABSTRACT A technique used for designing radar poly-phase codes, is used to design mismatched filt... more ABSTRACT A technique used for designing radar poly-phase codes, is used to design mismatched filters for long-range active sonar systems, where transmit waveforms are Doppler-sensitive. The long ranges and operational scenarios involved mean that only single-ping operations are considered. The waveforms under consideration are long-duration Cox combs and sinusoidally frequency modulated (SFM) pulses, arbitrarily selected to occupy the frequency range 1 to 2 kHz. When used in conjunction with a matched filter, these waveforms offer an attractive Doppler resolution, but suffer from significant range sidelobes. The proposed mismatched filters attempt to improve their range resolution or lower their sidelobes across the zero-Doppler region of the range-Doppler domain. The designed cross-ambiguity functions achieve range sidelobes lower than −32.5 dB for the Cox comb, and −33.0 dB for the SFM pulse, as well as acceptable Doppler sidelobes at non-zero delays. This comes at a price of a signal-to-noise ratio (SNR) loss of 18.5 dB for the Cox comb, and 20.5 dB for the SFM pulse.
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Papers by Raphael F Pallaud