Classifications

• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
  • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
  • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
  • G10L21/0272—Voice signal separating
• • G—PHYSICS
  • G06—COMPUTING OR CALCULATING; COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F18/00—Pattern recognition
  • G06F18/20—Analysing
  • G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
  • G06F18/213—Feature extraction, e.g. by transforming the feature space; Summarisation; Mappings, e.g. subspace methods
  • G06F18/2134—Feature extraction, e.g. by transforming the feature space; Summarisation; Mappings, e.g. subspace methods based on separation criteria, e.g. independent component analysis
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
  • H03H21/00—Adaptive networks
  • H03H21/0012—Digital adaptive filters

Definitions

• Equation (3) The second type of procedure described in FIGURE 2A uses Equation (3).
• the criteria is applied to the entire data set, or selected data points from the entire data set.
• the related adaptation process does not progress per sample, but utilizes the whole data set over which a constant, static mixing matrix is assumed to apply.
• this method is somewhat more robust than the first, it is essentially an offline method not suitable for real time signal separation.
• the assumption of a static constant matrix is incorrect, the accuracy of the unmixing process suffers.
• FIGURE 14 shows an audio application based on the signal separation and recovery procedures of this invention.
• Audio signals are converted electrical signals by the elements of a microphone array 1402.
• Each element of microphone array 1402 receives a different version (or mixture) of the sounds in the environment. Different arrangements of microphone elements may be designed depending on the nature of the application, number of mixtures, desired accuracy, and other relevant criteria. Following some signal conditioning and filtering, these mixture signals are converted from analog format to digital format, so that they can be stored and processed.
• the DSP device 806 of the system is programmed in accordance with the procedures for signal separation and recovery procedures of this invention.
• the internals of DSP device 806 may include a variety of functional units for various arithmetic and logic operations, and digital representation, data storage and retrieval means to achieve optimum performance. Circuits and structures shown in figure may undergo further integration towards realization of the whole system on a single chip.
• FIGURE 14 illustrates the application specific system in the framework of the hardware accelerated implementation option shown in FIGURE 8.
• a microphone is a device that converts acoustic energy received as vibratory motion of air particles into electrical energy sent along the microphone cable as a vibratory motion of electrons. Once this conversion has taken place, the sound information is freed from the normal acoustic constraints. It can be amplified, transmitted on a wire or via radio waves, it can be stored, and processed.
• directivity which refers to the response of the microphone to sounds received from all angles on a plane, e.g. omnidirectional, cardioid, shotgun
• the diaphragms of the silicon microphones can be thin Mylar foil, polyester, a low pressure chemical vapor deposition (LPCVP) silicon nitride film, etc.
• LPCVP low pressure chemical vapor deposition
• Such assembly progress always involves laborious alignment procedures, and given that most bonding processes also involve procedures that affect integrated electronics and change the material characteristics it seems that microphones with single chip solutions should be preferable.
• the fabrication process sequence of this microphone uses seven masks including silicon anisotropic etching and sacrificial layer etching. It is claimed that diaphragms with corrugations have several advantages for the design of silicon condenser microphones.
• the term microphone array is used to refer to compact structures, less than 5 cm in any dimension. At this size, a single device or interface can contain the array and there is no need to wire a whole room or enclosure with microphones in order to carry out sophisticated audio signal functions, such as signal separation. Although the physical dimensions make beamforming and localization mathematically impractical at this size, the ultimate goal is to integrate all the functions that a person can perform with one good ear onto such a device. Multiple devices can then be arranged to solve further problems that require physical dimensions suitable for source localization and beamforming.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Data Mining & Analysis (AREA)
• Computer Vision & Pattern Recognition (AREA)
• Bioinformatics & Cheminformatics (AREA)
• General Engineering & Computer Science (AREA)
• Audiology, Speech & Language Pathology (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Health & Medical Sciences (AREA)
• Signal Processing (AREA)
• Life Sciences & Earth Sciences (AREA)
• Artificial Intelligence (AREA)
• Quality & Reliability (AREA)
• Bioinformatics & Computational Biology (AREA)
• Evolutionary Biology (AREA)
• Evolutionary Computation (AREA)
• Human Computer Interaction (AREA)
• General Physics & Mathematics (AREA)
• Computational Linguistics (AREA)
• Circuit For Audible Band Transducer (AREA)
• Cash Registers Or Receiving Machines (AREA)
• Sheets, Magazines, And Separation Thereof (AREA)
• Automatic Disk Changers (AREA)
• Complex Calculations (AREA)
• Manipulator (AREA)
• Filters That Use Time-Delay Elements (AREA)
• Information Transfer Systems (AREA)
• Image Processing (AREA)
• Logic Circuits (AREA)

Priority Applications (8)

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Publications (1)

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Family Applications (1)

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Cited By (29)

Families Citing this family (49)

Citations (1)

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• 1998
  • 1998-06-18 CA CA002294262A patent/CA2294262A1/en not_active Abandoned
  • 1998-06-18 AU AU81629/98A patent/AU740617C/en not_active Ceased
  • 1998-06-18 US US09/445,778 patent/US6625587B1/en not_active Expired - Lifetime
  • 1998-06-18 JP JP50499099A patent/JP4477148B2/ja not_active Expired - Fee Related
  • 1998-06-18 DE DE69817181T patent/DE69817181T2/de not_active Expired - Lifetime
  • 1998-06-18 WO PCT/US1998/013051 patent/WO1998058450A1/en not_active Ceased
  • 1998-06-18 AT AT98931517T patent/ATE247340T1/de not_active IP Right Cessation
  • 1998-06-18 CN CN98807317.XA patent/CN1264507A/zh active Pending
  • 1998-06-18 EP EP98931517A patent/EP0990306B1/en not_active Expired - Lifetime

Patent Citations (1)

Non-Patent Citations (1)

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