Patent
Rate loop processor for perceptual encoder/decoder
James David Johnston
- 22 Sep 1994
166
TL;DR: In this paper, a method and apparatus for quantizing audio signals is described, which advantageously produces a quantized audio signal which can be encoded within an acceptable range, using a scale factor which is interpolated between a threshold based on the calculated threshold of hearing at a given frequency and the absolute threshold for hearing at the same frequency.
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Abstract: A method and apparatus for quantizing audio signals is disclosed which advantageously produces a quantized audio signal which can be encoded within an acceptable range. Advantageously, the quantizer uses a scale factor which is interpolated between a threshold based on the calculated threshold of hearing at a given frequency and the absolute threshold of hearing at the same frequency.
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Citations
Patent
Mobile tele-presence system with a microphone system
David Bjorn Roe,Daniel Steven Sanchez,Marco Pinter,Derek J. Walters,Charles S. Jordan +4 more
- 17 Apr 2008
TL;DR: In this paper, the location of the microphones roughly coincides with the position of ears on a human body, which creates a mobile robot that more effectively simulates the tele-presence of an operator of the system.
577
Patent
Telepresence robot with a camera boom
Yulun Wang,Charles S. Jordan,Kevin Hanrahan,Daniel Steven Sanchez,Marco Pinter +4 more
- 31 Aug 2009
TL;DR: In this paper, a remote controlled robot with a head that supports a monitor and is coupled to a mobile platform is described, where an auxiliary camera coupled to the mobile platform by a boom is connected to a robot head.
567
Patent
Interfacing with a mobile telepresence robot
Yulun Wang,Charles S. Jordan,Timothy C. Wright,Michael Chan,Marco Pinter,Kevin Hanrahan,Daniel Steven Sanchez,James Ballantyne,Cody Herzog,Blair Whitney,Fuji Lai,Kelton Temby,Eben Christopher Rauhut,Justin H. Kearns,Cheuk Wah Wong,Timothy S. Farlow +15 more
- 27 Jan 2012
TL;DR: In this article, a telepresence robot may include a drive system, a control system, an imaging system, and a mapping module, and each tag may include tag coordinates and tag information, including a tag annotation.
420
Patent
Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels
Stephen Smyth,Smyth Michael H,William Paul Smith +2 more
- 02 May 1996
TL;DR: A subband audio coder employs perfect/nonperfect reconstruction filters, predictive/non-predictive subband encoding, transient analysis, and psycho-acoustic/minimum mean square error (mmse) bit allocation over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio as discussed by the authors.
274
Patent
Robust techniques for optimal upstream communication between cable modem subscribers and a headend
Thomas J. Quigley,Jonathan S. Min,Lisa V. Denney,Henry Samueli,Sean F. Nazareth,Feng Chen,Fang Lu,Christopher R. Jones +7 more
- 09 Feb 2001
TL;DR: In this paper, a number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a head end and a plurality of cable modems located different distances from the head end are discussed.
217
References
Numerical recipes
TL;DR: This section discusses a particular type of low-pass filter, well-adapted for data smoothing, and termed variously Savitzky-Golay, least-squares, or DISPO (Digital Smoothing Polynomial) filters.
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Transform coding of audio signals using perceptual noise criteria
TL;DR: A 4-b/sample transform coder is designed using a psychoacoustically derived noise-making threshold that is based on the short-term spectrum of the signal, and tested in a formal subjective test involving a wide selection of monophonic audio inputs.
Analysis/Synthesis filter bank design based on time domain aliasing cancellation
John Princen,A. Bradley +1 more
TL;DR: A single-sideband analysis/synthesis system is proposed which provides perfect reconstruction of a signal from a set of critically sampled analysis signals and allows overlap between adjacent time windows, implying that time domain aliasing is introduced in the analysis; however, thisAliasing is cancelled in the synthesis process, and the system can provide perfect reconstruction.
586
Subband/Transform coding using filter bank designs based on time domain aliasing cancellation
John Princen,Andrew Johnson,A. Bradley +2 more
- 06 Apr 1987
TL;DR: A new, oddly stacked, critically sampled, single side-band (SSB) analysis/synthesis system based on Time Domain Aliasing Cancellation (TDAC) is described in this paper.
460
Optimizing digital speech coders by exploiting masking properties of the human ear
TL;DR: New results of masking and loudness reduction of noise are reported and the design principles of speech coding systems exploiting auditory masking are described.
458