Analysis-synthesis telephony, with special reference to the vocoder

Halsey, R.J.; Swaffield, John

doi:10.1049/ji-3-2.1948.0099

Cited by 5 publications

(2 citation statements)

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“…In particular, it took a long time to abandon the delivery of analog waveforms to the electrodes and instead adopt pulsatile stimulation that provided explicit control of the all-or-none action potentials used to convey information throughout the nervous system [ 28 ]. It was well known that only a few channels of fairly broad spectral information would convey understandable speech [ 29 ], but early work on speech processors was often devoted to preprocessing the speech signals into high level percepts such as formants instead of simply delivering the raw spectral information [ 30 ]. The electronics technology was often focused on the addition of more channels rather than more selectivity of those channels.…”

Section: Case Studiesmentioning

confidence: 99%

Neural Prosthetics:A Review of Empirical vs. Systems Engineering Strategies

Loeb
¹

2018

Applied Bionics and Biomechanics

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Implantable electrical interfaces with the nervous system were first enabled by cardiac pacemaker technology over 50 years ago and have since diverged into almost all of the physiological functions controlled by the nervous system. There have been a few major clinical and commercial successes, many contentious claims, and some outright failures. These tend to be reviewed within each clinical subspecialty, obscuring the many commonalities of neural control, biophysics, interface materials, electronic technologies, and medical device regulation that they share. This review cites a selection of foundational and recent journal articles and reviews for all major applications of neural prosthetic interfaces in clinical use, trials, or development. The hard-won knowledge and experience across all of these fields can now be amalgamated and distilled into more systematic processes for development of clinical products instead of the often empirical (trial and error) approaches to date. These include a frank assessment of a specific clinical problem, the state of its underlying science, the identification of feasible targets, the availability of suitable technologies, and the path to regulatory and reimbursement approval. Increasing commercial interest and investment facilitates this systematic approach, but it also motivates projects and products whose claims are dubious.

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Section: Case Studiesmentioning
confidence: 99%

Neural Prosthetics:A Review of Empirical vs. Systems Engineering Strategies
Loeb
¹

2018
Applied Bionics and Biomechanics
34
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30
0
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“…The excitation requires a voiced-unvoiced decision to be made and the pitch period to be computed if the speech is voiced. The energies are determined in each channel by bandpass filtering the speech signal, decimating and rectifying the output from the bandpass filters down to a 500Hz sample rate and this signal is then applied to a 25Hz lowpass filter which as well as allowing signal decimation down to 50Hz also provides for a smoother spectral envelope which can vary at a syllabic rate [4,5].…”

Section: Jsru Channel Vocodermentioning
confidence: 99%

Multipulse-excited channel vocoder
Crossman
¹
,
Fallside²
ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing
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A B S T R A C TMultipulse-excitation has greatly improved the speech quality achievable from linear predictive coders which previously required speech to be classified as voiced or unvoiced for excitation purposes.Multipulse removes the need for voicing classification, it improves speech quality by enhancing the excitation and offsets errors in the vocal tract filter. The authors have investigated a multipulse-excited channel vocoder.The prime objective being to improve the speech quality of the channel vocoder and achieve multipulse linear prediction quality. We describe how a particular channel vocoder is incorporated into a multipulse algorithm, and report the initial results of our multipulse-excited channel vocoder investigation.

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Overview of Voice Communications and Speech Processing
İnce
¹

1992
The Kluwer International Series in Engineering and Computer Science
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Analysis-synthesis telephony, with special reference to the vocoder

Cited by 5 publications

References 0 publications

Neural Prosthetics:A Review of Empirical vs. Systems Engineering Strategies

Neural Prosthetics:A Review of Empirical vs. Systems Engineering Strategies

Multipulse-excited channel vocoder

Overview of Voice Communications and Speech Processing

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