Class 84/621 - Noise reduction (e.g., error prevention, etc.)

Subclass of Class 84 - Music
Definition: Subject matter wherein circuitry is provided to reduce electrical
No. of patents: 39
Last issue date: 07/26/2011

Number	Title	Issue Date
7985916	Electronic wind instrument and zero point compensation method therefor Electronic wind instrument includes: a breath flow detector detecting a flow of breath blown by a user; a tone generator forming a tone signal; a control section controlling the tone generator on the basis of an output signal of the breath flow detector; and a zero ...	07/26/2011
7968786	Volume adjusting apparatus and volume adjusting method A volume adjusting apparatus includes a sound collecting unit configured to collect noise data of a surrounding environment, an analyzing unit configured to extract a feature value indicating a feature of the noise data collected by the sound collecting unit and a f...	06/28/2011
7872189	Electronic musical sound generator An electronic musical sound generator prevents a sound production sequence to be stopped from continuing to be produced even through the key is released. Even if an erroneous instruction is sent to prevent identification data from being compared, in other words, if ...	01/18/2011
7363216	Method and system for parametric characterization of transient audio signals A method of parametrically encoding a transient audio signal, including the steps of: determining a set V of the N largest frequency components of the transient audio signal, where N is a predetermined number; determining an approximate envelope of the transient aud...	04/22/2008
7078610	Electronic percussion instrument An electronic percussion instrument samples an input waveform. An unused waveform number may be automatically assigned to the sampled waveform upon sampling or when a user-specified waveform number is already in use for another waveform. Musical time parameters for ...	07/18/2006
6157976	PCI-PCI bridge and PCI-bus audio accelerator integrated circuit A semiconductor device with an embedded PCI 2.1 compliant bridge provides expanded functionality as system-level implementations of a PCI-to-PCI bridge, and enhances the level of integration possible. The embedded PCI-to-PCI bridge allows the creation of ...	12/05/2000
5905221	Music chip The present invention discloses a digital processing device with smooth-clipping function and a digital musical tone synthesizing device using it. When one or a plurality of digital values are input to the digital processing device and a smooth-clipping m...	05/18/1999
5886278	Apparatus for reducing change in timbre at each point where tone ranges are switched A tone waveform reproduction apparatus, for an electronic musical instrument employing a plurality of samples in consonance with tone ranges, that can reduce a change in a timbre so that it will not be noticeable, and that can provide a natural transition...	03/23/1999
5847304	PC audio system with frequency compensated wavetable data The PC audio circuit described interfaces with and provides audio enhancement to a host personal computer of the type including a central processor, system memory and a system bus. The PC audio circuit includes a digital signal processor (DSP) for process...	12/08/1998
5789689	Tube modeling programmable digital guitar amplification system An electric guitar amplifier which utilizes a digital signal processor to produce vacuum-tube-like distortion without certain unwanted audio artifacts created by previous digital realizations of nonlinear, high-gain functions. By virtue of a microprocesso...	08/04/1998
5763801	Computer system and method for performing wavetable music synthesis which stores wavetable data in system memory A PCI-based system and method for performing wavetable music synthesis which uses system memory to store wavetable data is provided. The system and method utilize the benefits of the PCI bus while mitigating the disadvantages introduced by having to arbit...	06/09/1998
5714702	Pedal controlling system and method of controlling pedal for recording and reproducing pedal action A pedal controller monitors a damper pedal incorporated in an acoustic piano, and reduces the amount of music data information represented by digital pedal position signals through an anti-aliasing filtering, a decimation and an interpolation without sacr...	02/03/1998
5708227	Electronic musical instrument In an electronic musical instrument which generates musical tone signals based on playing information input from a key switch circuit 10, a key scan circuit 11 includes a decode circuit 22 to which the current status information and the previous status in...	01/13/1998
5689080	Computer system and method for performing wavetable music synthesis which stores wavetable data in system memory which minimizes audio infidelity due to wavetable data access latency A computer system and method for performing wavetable music synthesis which uses system memory to store wavetable data and minimizes audio infidelity introduced by wavetable data access latency. The system comprises a system memory which stores wavetable ...	11/18/1997
5430241	Signal processing method and sound source data forming apparatus A method for processing a digital signal produced by digitizing an analog signal such as a musical instrument sound signal, and an apparatus for producing sound source data. When the input signal contains a periodically repetitive waveform portion, the fu...	07/04/1995
5268529	Method for generating an envelope signal for an electronic musical instrument The present invention relates to an envelope signal generator for electronic musical instruments, and more particularly to an envelope signal generator that generates natural envelopes from which digital noises are removed substantially by obtaining a dif...	12/07/1993
5167179	Electronic musical instrument for simulating a stringed instrument In order to accurately simulate the sounding system of the stringed instrument such as the violin and cello, an electronic musical instrument provides a performance unit such as a keyboard and a multi-channel sound source unit. As the sound source unit, t...	12/01/1992
5166462	Musical tone control apparatus employing finger flexing angle detection A musical tone control apparatus is provided with a compensation device which compensates a magnitude of detected signals output from each sensor arranged on each finger. Therefore, even though adjacent fingers are involuntarily bent when a specific finge...	11/24/1992
5149903	Musical tone generating apparatus having means for controlling the amplitude of a musical tone signal envelope A musical tone generating apparatus includes a waveform generator for generating a musical tone signal corresponding to a desired musical tone based on a key-on event which occurs in a keyboard and an envelope generator for generating an envelope which co...	09/22/1992
5144676	Digital sampling instrument A digital sampling instrument is disclosed. The instrument provides the capability of accessing and outputting stored digital data within a single clock cycle. The instrument also provides improved volume scaling for sound generation and further eliminate...	09/01/1992
5088379	Electronic melody generating system having memory separated from melody generating unit A melody generating system is fabricated from a switch unit operative to produce an activation signal, an analog signal producing unit responsive to the activation signal and producing an analog melody signal carrying pieces of melody information used for...	02/18/1992
5054359	MIDI signal processor In a MIDI signal processor for use with a CD player, MIDI data is extracted from predetermined subcode frame of a digital output signal of the CD player. The extracted MIDI data is rearranged into a set of bytes. A predetermined start bit is added to a he...	10/08/1991
5000074	Effect imparting device for an electronic musical instrument or the like apparatus A variable delay circuit for delaying an input signal and being capable of changing length of this delay is provided and various modulation effects are imparted by this delay. When change in the delay length has been designated, a decay envelope is impart...	03/19/1991
4987600	Digital sampling instrument A digital sampling instrument is disclosed. The instrument provides the capability of accessing and outputting stored digital data within a single clock cycle. The instrument also provides improved volume scaling for sound generation and further eliminate...	01/22/1991
4942799	Method of generating a tone signal A tone generation system and method generates tone signals having complex harmonic components while reducing aliasing noise resulting from sampling of high frequency harmonics. In a first step, waveshape data which has been sampled with a second sampling ...	07/24/1990
4932303	Percussion type electronic musical instrument having reduced abnormal vibration tone generation An electronic musical instrument includes a performance operating member, a performance operation detection unit, a self vibration detection data forming unit, a tone generation control unit, and a tone signal generator. The performance operation detectio...	06/12/1990
4691608	Waveform normalizer for electronic musical instrument A CPU reads out sampled waveform data stored in a waveform memory and detects a peak value of the read-out data for each predetermined block using working registers, thereby obtaining an interpolated envelope curve. The CPU then divides the sampled wavefo...	09/08/1987
4683589	Electronic audio system An electronic audio signal processor circuit particularly suited for electrical instruments as an electric bass guitar for providng controlled distortion and tone alteration. The circuitry includes a compressor circuit at the input operated in conjunction...	07/28/1987
4644841	Electronic musical instrument An electronic musical instrument which has a keyboard and creates a musical tone by striking keys of the keyboard, is provided with an operation control circuit and an adder both for effecting keyboard switch chattering prevent operation processing and to...	02/24/1987
4495640	Adjustable distortion guitar amplifier A programmable adjustable distortion amplifier circuit has a first channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the first channel, a second channel having an adjustable gain and a fi...	01/22/1985
4444082	Modified transient harmonic interpolator for an electronic musical instrument A method and apparatus for interpolating between the harmonic structures of a waveform stored in memory during portions or the entire transient periods of said waveform. In an electronic musical instrument having a greater number of selectively actuable s...	04/24/1984
4296663	Electronic musical instrument In an electronic musical instrument, two or more pulse signals different in phase are generated each having a frequency corresponding to the tonal pitch of an operated key, an envelope waveshape is read out upon every key operation, sampling is executed o...	10/27/1981
4279185	Electronic music sampling techniques The disclosure describes improved apparatus for sampling a digitally-stored waveshape only at a rate 2N times the fundamental frequency of a note synthesized, where N is an integer. The apparatus includes a digital memory for storing a digital ...	07/21/1981
4245541	Apparatus for reducing noise in digital to analog conversion In a musical instrument in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced points defining a cycle of an audio waveform are transferred sequentially from a waveshape memory in repetitive cycles at...	01/20/1981
4223583	Apparatus for producing musical tones having time variant harmonics An electronic tone generator of a type in which an audio signal of controlled waveform is generated from a stored master data list of digitally coded words incorporates apparatus for changing the harmonic structure of the waveform with time during the gen...	09/23/1980
4182210	Keying system for an electronic musical instrument A keying system for an electronic musical instrument in which the absolute value of the amplitude of a musical tone signal generated with a predetermined periodicity is detected so that gating of the musical tone signal is allowed only when the amplitude ...	01/08/1980
4161128	Electronic musical instrument An electronic musical instrument comprises a circuit for generating a stepwise envelope waveform which modulates a musical tone waveform signal, a detecting circuit for detecting the phase of the musical tone waveform signal where the amplitude of the mus...	07/17/1979
4114496	Note frequency generator for a polyphonic tone synthesizer A frequency generator for a keyboard operated electronic music instrument using a single master clock source for selectively producing all the notes of the musical scale. A set of frequency numbers corresponding to each of the notes of a diatonic scale ar...	09/19/1978
4111090	Noise reduction circuit for a digital tone generator A noise suppression circuit for digital tone generator in which a table of digitized data points are converted at a rate controlled by the fundamental frequency of the tone being generated. The suppression circuit determines the difference between each pa...	09/05/1978

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Class 84/621 - Noise reduction (e.g., error prevention, etc.)