Class 84/661 - Filtering

Subclass of Class 84 - Music
Definition: Subject matter wherein a desired waveform is obtained by
No. of patents: 155
Last issue date: 05/15/2012

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Number	Title	Issue Date
8178772	Resonance sound adding apparatus for keyboard instrument Resonators generate resonance sound data of given resonant frequencies based on sound signal data corresponding to a pitch of a key. Each resonator includes a delay circuit which delays an input based on delay time data, a second adder which adds an output from the ...	05/15/2012
8067684	Filter device and electronic musical instrument using the filter device In a filter device, a filter coefficient calculation circuit has a parameter table. The parameter table stores a plurality of sets of filter coefficients associated with a first parameter based on a frequency and a second parameter based on respective plurality of l...	11/29/2011
7999170	Acoustic drum set amplifier device specifically calibrated for each instrument within a drum set An acoustic drum set amplifier specifically calibrated for each instrument within a drum set, specifically a snare drum, a bass drum, a bongo drum, tom-tom drum, a hi-hat, ride cymbal and crash cymbals, for optimizing the sound frequency of the instrument. In operat...	08/16/2011
7622665	Filter device and electronic musical instrument using the filter device In a filter device, a filter coefficient calculation circuit has a parameter table. The parameter table stores a plurality of sets of filter coefficients associated with a first parameter based on a frequency and a second parameter based on respective plurality of l...	11/24/2009
7482530	Signal processing apparatus and method, recording medium and program A signal processing apparatus and method is disclosed by which signal components of different musical intervals of an audio signal can be obtained with a small amount of arithmetic operation. A re-sampling section re-samples an audio signal inputted thereto with a s...	01/27/2009
7277907	Method of setting a transfer function of an adaptive filter A method of setting a transfer function of an adaptive filter. The adaptive filter is used for processing an audio signal. The method includes setting a first, a second, and a third pole, setting a first zero without resting upon the audio signal. A real part of the...	10/02/2007
7277554	Dynamic range compression using digital frequency warping A dynamic range compression system is provided, using either a sample-by-sample or a block processing system. Such a system can be used, for example, in a hearing aid. The system, using a frequency-warped processing system, is comprised of a cascade of all-pass filt...	10/02/2007
7092463	Method and apparatus for interference rejection The invention relates to an apparatus, and an associated method, in a communication system that is tolerant to interference. The received signal is divided into a real and an imaginary part, and the noise and interference is modeled as a filtered process. The invent...	08/15/2006
7072429	Filter coefficient setting technique for variable filtering process and variable sampling frequency conversion A first series of filter coefficients stored in a memory itself corresponds to a given filter characteristic such as a given high cutoff frequency. A second series of filter coefficients is generated by performing an interpolation process on the first series of filt...	07/04/2006
7062337	Artificial ambiance processing system An apparatus and method simulates more accurately the natural statistics of a physical reverberation process. A new filter design is provided having a comb shaped group delay. Gain minimums at a plurality of frequencies are combined with a delay line to create a con...	06/13/2006
7016841	Singing voice synthesizing apparatus, singing voice synthesizing method, and program for realizing singing voice synthesizing method A singing voice synthesizing apparatus is provided, which enables achievement of a natural sounding synthesized singing voice with a good level of comprehensibility. A phoneme database stores a plurality of voice fragment data formed of voice fragments each being a ...	03/21/2006
6995307	Self-playing musical device Apparatus and methods for a self-playing musical device configured to present a realistic music service as part of a musical wind instrument. The device may be fitted inside the sound pipe of a musical instrument to play music. If desired, the device is shaped and c...	02/07/2006
6980665	Spectral enhancement using digital frequency warping A frequency-warped processing system using either sample-by-sample or block processing is provided. Such a system can be used, for example, in a hearing aid to increase the dynamic-range contrast in the speech spectrum, thus improving ease of listening and possibly ...	12/27/2005
6975977	Low-complexity, high accuracy model of a CPU anti-resonance system A low-complexity, high accuracy model of a CPU anti-resonance system has been developed. The model includes a simulated load model, a simulated transistor that simulates the performance of a high frequency capacitor, and a simulated capacitor that simulates the perf...	12/13/2005
6972364	User interface and a synthesizer with a user interface A synthesiser to generate sounds often in a musical environment but also in a speech environment. Such synthesis of sounds is often accompanied by at least one mode of filtering or many modes. Hitherto, the application of such filtering has involved a control for ea...	12/06/2005
6970029	Variable-delay signal generators and methods of operation therefor A variable-delay signal generator circuit includes a delay chain and an interpolator circuit. The delay chain produces multiple multi-phase signals, where each of the multi-phase signals represents a delayed version of an input event signal. Each of the multi-phase ...	11/29/2005
6915222	Semiconductor integrated circuit including waveform-generating circuit having pulsed waveform-generating function A semiconductor integrated circuit according to an aspect of the invention comprises a first storage circuit, second storage circuit, adder circuit, timer, first comparator circuit and waveform-generating circuit. The first storage circuit stores a first value used ...	07/05/2005
6911863	Integrated DVB filter A filter for processing frequency signals, preferably received, particularly digital television signals is described, which filter comprises a Chebyshev filter (11, 12), a subsequent all-pass filter (13) and a control device (14 to 20) fo...	06/28/2005
6881892	Method of configurating acoustic correction filter for stringed instrument A method is provided for designing an acoustic correction filter applicable to a stringed instrument, which is composed of a string member operable to undergo a vibration, a support member for supporting the string member, a body member responsive to the vibration t...	04/19/2005
6849795	Controllable frequency-reducing cross-product chain This invention provides a signal processing and signal synthesis technique from a family of signal processing and signal synthesis techniques designed to readily interwork or be used individually in creating new forms of rich musical timbres. A real-time controllabl...	02/01/2005
6548749	Electronic musical instrument and tone volume control method Multipliers respectively multiply a tone signal supplied from a sound source and a tone signal corrected by a filter according to hearing correction characteristics by balance control coefficients generated by a control coefficient generator based on tone...	04/15/2003
6525255	Sound signal analyzing device An average is calculated of every predetermined number of sample amplitude values of a sound signal from an external sound source, and the respective averages are output as a time-series of average level information. On the basis of the average level info...	02/25/2003
6448488	Measurement and processing of stringed acoustic instrument signals A system and a method of measuring, decomposing, processing and uniquely recombining forces and vibrations acting on stringed musical instruments (SMI). The system utilizes a digital signal processor and reproduces the musical sound characteristics of an ...	09/10/2002
6410838	Musical sound signal synthesizer and method for synthesizing musical sound signals using nonlinear transformer A musical sound signal synthesizer with a simple construction for synthesizing complex musical sound waveform signals including many harmonics in a peculiar form. A phase information generator 11 supplies phase information x with a sawtooth wave changing ...	06/25/2002
6350943	Electric instrument amplifier An electric instrument amplifier emulates an audio characteristics of a traditional vacuum-tube type amplifier. The electric instrument amplifier is formed in a single housing for amplifying an audio signal from an electric instrument. The electric instru...	02/26/2002
6300553	Pitch shifter A pitch shifter capable of shifting an acoustic signal in pitch to an arbitrary level with a high degree of accuracy without any change in reproduction time, and also sufficiently reducing high-frequency distortion without being increased in size or speed...	10/09/2001
6284965	Physical model musical tone synthesis system employing truncated recursive filters A tone synthesis system employs digital filtering methods to enable the practical usage of unstable filter elements in a real-time synthesis model. Truncated infinite impulse response (TIIR) filters are used to approximate portions of the reflection impul...	09/04/2001
6259014	Additive musical signal analysis and synthesis based on global waveform fitting This application describes a method for musical signal analysis and synthesis using global waveform fitting (GWF). GWF uses a sinusoidal model with quadratic phase. GWF tries to fit the entire data record (signal waveform) to the assumed signal model. The...	07/10/2001
6218604	Tone generator with diversification of waveform using variable addressing A music apparatus has a set of controls manually operable to input a performance event, a waveform memory storing an original waveform sample composed of a series of digital values sequentially readable from a default start address, and a processor for ex...	04/17/2001
6175073	Tone synthesizing device and method based on physical model tone generator Physical model tone generator, which includes a loop section with a signal delay element, generates a driving signal by modifying a loop output signal from the loop in accordance with a performance parameter such as a bowing velocity, and introduces the g...	01/16/2001
6111181	Synthesis of percussion musical instrument sounds A synthesis of percussion musical instruments sounds is provided using a microprocessor (17) that implements an all pole lattice filter and applying either a single impulse signal to the filter or N samples of an excitation signal sequence to the filter b...	08/29/2000
6111183	Audio signal synthesis system based on probabilistic estimation of time-varying spectra The present invention describes methods and means for estimating the time-varying spectrum of an audio signal based on a conditional probability density function (PDF) of spectral coding vectors conditioned on pitch and loudness values. Using this PDF a t...	08/29/2000
6101469	Formant shift-compensated sound synthesizer and method of operation thereof For use in a synthesizer having a wave source that produces a periodic wave, frequency shifting circuitry for frequency-shifting the periodic wave and waveshaping circuitry for transforming the periodic wave into a waveform containing a formant, the frequ...	08/08/2000
6040516	Tone generation system using computer software and storage medium storing the computer software There are provided a tone generator system using computer software and a storage medium storing the computer software. A musical tone synthesis module generates a musical tone signal by generating an excitation signal in response to an request for generat...	03/21/2000
5998726	Musical sound generating system with controlled tone A musical sound generating system which generates musical sounds having desired tone regardless of the variation of volume setting. In the musical sound generating system, the standard tone control touch curve TCstd, the maximum tone control touch curve T...	12/07/1999
5945621	Musical tone control apparatus with envelope processing In a musical tone control apparatus, musical tones to be generated are controlled according to musical tone control parameters which include an envelope that has been extracted and processed. The range of variation of the extracted envelope may be limited...	08/31/1999
5942708	Tone generator with diversification of waveform using variable addressing A music apparatus has a set of controls manually operable to input a performance event, a waveform memory storing an original waveform sample composed of a series of digital values sequentially readable from a default start address, and a processor for ex...	08/24/1999
5911170	Synthesis of acoustic waveforms based on parametric modeling A method is disclosed for synthesizing acoustic waveforms, especially musical instrument sounds. The acoustic waveforms are characterized by time-varying amplitudes, frequencies and phases of sinusoidal components. These time-varying parameters, at each a...	06/08/1999
5900570	Method and apparatus for synthesizing musical sounds by frequency modulation using a filter This invention provides a circuit for synthesizing musical sounds. In one embodiment, the circuit includes a first order FIR highpass filter that is placed between a modulation phase increment oscillator and a carrier phase increment oscillator. The inven...	05/04/1999
5886276	System and method for multiresolution scalable audio signal encoding An audio signal analyzer and encoder is based on a model that considers audio signals to be composed of deterministic or sinusoidal components, transient components representing the onset of notes or other events in an audio signal, and stochastic compone...	03/23/1999

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Class 84/661 - Filtering