JPS6359159B2 - - Google Patents

Info

Publication number
JPS6359159B2
JPS6359159B2 JP55072121A JP7212180A JPS6359159B2 JP S6359159 B2 JPS6359159 B2 JP S6359159B2 JP 55072121 A JP55072121 A JP 55072121A JP 7212180 A JP7212180 A JP 7212180A JP S6359159 B2 JPS6359159 B2 JP S6359159B2
Authority
JP
Japan
Prior art keywords
data
data values
signal
waveform
smoothing function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP55072121A
Other languages
English (en)
Japanese (ja)
Other versions
JPS55161296A (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of JPS55161296A publication Critical patent/JPS55161296A/ja
Publication of JPS6359159B2 publication Critical patent/JPS6359159B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H7/00—Instruments in which the tones are synthesised from a data store, e.g. computer organs
    • G10H7/02—Instruments in which the tones are synthesised from a data store, e.g. computer organs in which amplitudes at successive sample points of a tone waveform are stored in one or more memories
    • G10H7/04—Instruments in which the tones are synthesised from a data store, e.g. computer organs in which amplitudes at successive sample points of a tone waveform are stored in one or more memories in which amplitudes are read at varying rates, e.g. according to pitch
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/06—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour
    • G10H1/12—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour by filtering complex waveforms
    • G10H1/125—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour by filtering complex waveforms using a digital filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2250/00—Aspects of algorithms or signal processing methods without intrinsic musical character, yet specifically adapted for or used in electrophonic musical processing
    • G10H2250/131—Mathematical functions for musical analysis, processing, synthesis or composition
    • G10H2250/141—Bessel functions, e.g. for smoothing or modulating, for FM audio synthesis or for expressing the vibration modes of a circular drum membrane
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H2250/00—Aspects of algorithms or signal processing methods without intrinsic musical character, yet specifically adapted for or used in electrophonic musical processing
    • G10H2250/541—Details of musical waveform synthesis, i.e. audio waveshape processing from individual wavetable samples, independently of their origin or of the sound they represent
    • G10H2250/545—Aliasing, i.e. preventing, eliminating or deliberately using aliasing noise, distortions or artifacts in sampled or synthesised waveforms, e.g. by band limiting, oversampling or undersampling, respectively

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Analogue/Digital Conversion (AREA)
JP7212180A 1979-06-01 1980-05-29 Noise reducer in dda converter Granted JPS55161296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/046,135 US4245541A (en) 1979-06-01 1979-06-01 Apparatus for reducing noise in digital to analog conversion

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP3126645A Division JPH0642148B2 (ja) 1979-06-01 1991-04-30 楽音信号処理装置

Publications (2)

Publication Number Publication Date
JPS55161296A JPS55161296A (en) 1980-12-15
JPS6359159B2 true JPS6359159B2 (enExample) 1988-11-17

Family

ID=21941803

Family Applications (2)

Application Number Title Priority Date Filing Date
JP7212180A Granted JPS55161296A (en) 1979-06-01 1980-05-29 Noise reducer in dda converter
JP3126645A Expired - Lifetime JPH0642148B2 (ja) 1979-06-01 1991-04-30 楽音信号処理装置

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP3126645A Expired - Lifetime JPH0642148B2 (ja) 1979-06-01 1991-04-30 楽音信号処理装置

Country Status (2)

Country Link
US (1) US4245541A (enExample)
JP (2) JPS55161296A (enExample)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2459524A1 (fr) * 1979-06-15 1981-01-09 Deforeit Christian Synthetiseur numerique polyphonique de signaux periodiques et instrument de musique comportant un tel synthetiseur
US4538496A (en) * 1982-07-31 1985-09-03 Casio Computer Co., Ltd. Electronic musical instrument
JPH0754432B2 (ja) * 1986-12-30 1995-06-07 ヤマハ株式会社 楽音信号発生装置
JPH0626314B2 (ja) * 1987-10-30 1994-04-06 アルパイン株式会社 デジタルアナログ変換器
JPH0626315B2 (ja) * 1987-10-30 1994-04-06 アルパイン株式会社 デジタルアナログ変換方式
JPH0681051B2 (ja) * 1987-10-30 1994-10-12 亮一 森 デジタルアナログ変換方式
JPH0681046B2 (ja) * 1988-05-24 1994-10-12 亮一 森 デジタルアナログ変換器
JP2708037B2 (ja) * 1996-05-20 1998-02-04 ヤマハ株式会社 楽音信号発生装置
US6639535B1 (en) 1998-02-26 2003-10-28 Niigata Seimitsu Co.., Ltd. Digital to analog converter using B spline function
US6782297B2 (en) * 2001-05-24 2004-08-24 Eric Paul Tabor Methods and apparatus for data smoothing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020332A (en) * 1975-09-24 1977-04-26 Bell Telephone Laboratories, Incorporated Interpolation-decimation circuit for increasing or decreasing digital sampling frequency
US4111090A (en) * 1976-10-18 1978-09-05 Kawai Musical Instrument Mfg. Co. Ltd. Noise reduction circuit for a digital tone generator
JPS5370814A (en) * 1976-12-07 1978-06-23 Kawai Musical Instr Mfg Co Electronic musical instrument
JPS5917838B2 (ja) * 1977-11-01 1984-04-24 ヤマハ株式会社 電子楽器の波形発生装置
JPS5538565A (en) * 1978-09-13 1980-03-18 Nippon Musical Instruments Mfg Sound source device in electronic musical instrument

Also Published As

Publication number Publication date
JPH04330496A (ja) 1992-11-18
US4245541A (en) 1981-01-20
JPH0642148B2 (ja) 1994-06-01
JPS55161296A (en) 1980-12-15

Similar Documents

Publication Publication Date Title
US5111727A (en) Digital sampling instrument for digital audio data
US4433604A (en) Frequency domain digital encoding technique for musical signals
JPH0350280B2 (enExample)
JPS6359159B2 (enExample)
US5442127A (en) Waveform generation device having a memory for storing adjacent sample data in different data compression representations
US4402243A (en) Synthesizer circuit for electronic musical instrument
JPS6363915B2 (enExample)
US20040174279A1 (en) Method and apparatus for efficient conversion of signals using look-up table
US4638710A (en) Periodic waveform generation by nonrecyclically reading lower frequency audio samples and recyclically reading higher frequency audio samples
JPS6113757B2 (enExample)
US4256003A (en) Note frequency generator for an electronic musical instrument
JPH0145078B2 (enExample)
JP2619242B2 (ja) 時変スペクトルを有する楽音を発生する電子楽器
JPH0363079B2 (enExample)
US4282785A (en) Electronic musical instrument
US4646608A (en) Phased memory addressing for noise reduction in an electronic musical instrument
JP2724591B2 (ja) 電子楽器用高調波係数発生装置
US4549459A (en) Integral and a differential waveshape generator for an electronic musical instrument
US4683795A (en) Periodic wave form generation by recyclically reading amplitude and frequency equalized digital signals
JP2784399B2 (ja) 楽音発生装置
JPH0361999A (ja) ディジタル・データ・シンセサイザ
US4467688A (en) Polyphonic musical tone generator
JPS61152115A (ja) デジタルフイルタ
JPH0740194B2 (ja) 電子楽器
JPH07244487A (ja) 楽音信号発生装置