GB2250372B - Data compressing and encoding method - Google Patents

Data compressing and encoding method

Info

Publication number
GB2250372B
GB2250372B GB9117591A GB9117591A GB2250372B GB 2250372 B GB2250372 B GB 2250372B GB 9117591 A GB9117591 A GB 9117591A GB 9117591 A GB9117591 A GB 9117591A GB 2250372 B GB2250372 B GB 2250372B
Authority
GB
United Kingdom
Prior art keywords
looping
data
signal
encoding method
sound source
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 - Lifetime
Application number
GB9117591A
Other versions
GB9117591D0 (en
GB2250372A (en
Inventor
Makoto Furuhashi
Masakazu Suzuoki
Ken Kutaragi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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
Priority claimed from JP63292940A external-priority patent/JP2864508B2/en
Priority claimed from JP63292932A external-priority patent/JP2876604B2/en
Application filed by Sony Corp filed Critical Sony Corp
Priority to GB9117591A priority Critical patent/GB2250372B/en
Publication of GB9117591D0 publication Critical patent/GB9117591D0/en
Publication of GB2250372A publication Critical patent/GB2250372A/en
Application granted granted Critical
Publication of GB2250372B publication Critical patent/GB2250372B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10H7/08—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform
    • G10H7/10—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform using coefficients or parameters stored in a memory, e.g. Fourier coefficients
    • G10H7/105—Instruments in which the tones are synthesised from a data store, e.g. computer organs by calculating functions or polynomial approximations to evaluate amplitudes at successive sample points of a tone waveform using coefficients or parameters stored in a memory, e.g. Fourier coefficients using Fourier coefficients
    • 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
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/125—Extracting or recognising the pitch or fundamental frequency of the picked up signal
    • 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
    • G10H2210/00—Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments
    • G10H2210/031—Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an encoded audio signal
    • G10H2210/066—Musical analysis, i.e. isolation, extraction or identification of musical elements or musical parameters from a raw acoustic signal or from an encoded audio signal for pitch analysis as part of wider processing for musical purposes, e.g. transcription, musical performance evaluation; Pitch recognition, e.g. in polyphonic sounds; Estimation or use of missing fundamental
    • 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
    • G10H2250/055—Filters for musical processing or musical effects; Filter responses, filter architecture, filter coefficients or control parameters therefor
    • G10H2250/105—Comb filters
    • 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
    • G10H2250/215—Transforms, i.e. mathematical transforms into domains appropriate for musical signal processing, coding or compression
    • G10H2250/235—Fourier transform; Discrete Fourier Transform [DFT]; Fast Fourier Transform [FFT]
    • 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
    • G10H2250/261—Window, i.e. apodization function or tapering function amounting to the selection and appropriate weighting of a group of samples in a digital signal within some chosen time interval, outside of which it is zero valued
    • G10H2250/281—Hamming window
    • 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
    • G10H2250/571—Waveform compression, adapted for music synthesisers, sound banks or wavetables
    • G10H2250/601—Compressed representations of spectral envelopes, e.g. LPC [linear predictive coding], LAR [log area ratios], LSP [line spectral pairs], reflection coefficients

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Algebra (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A method for processing a digital signal produced by digitizing an analog signal such as a musical instrument sound signal. The looping domain is set so as to be a whole number multiple of the block which serves as the unit for bit compression, and the parameters of the looping start block are formed on the basis of data of the start and the end blocks. By applying the signal processing method to a sound source data forming apparatus, sound source data may be formed which is reduced in the looping noise and error caused by data compression and which is of superior sound quality. <IMAGE>
GB9117591A 1988-11-19 1991-08-14 Data compressing and encoding method Expired - Lifetime GB2250372B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9117591A GB2250372B (en) 1988-11-19 1991-08-14 Data compressing and encoding method

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP63292940A JP2864508B2 (en) 1988-11-19 1988-11-19 Waveform data compression encoding method and apparatus
JP63292932A JP2876604B2 (en) 1988-11-19 1988-11-19 Signal compression method
GB9117591A GB2250372B (en) 1988-11-19 1991-08-14 Data compressing and encoding method

Publications (3)

Publication Number Publication Date
GB9117591D0 GB9117591D0 (en) 1991-10-02
GB2250372A GB2250372A (en) 1992-06-03
GB2250372B true GB2250372B (en) 1993-06-23

Family

ID=27265812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9117591A Expired - Lifetime GB2250372B (en) 1988-11-19 1991-08-14 Data compressing and encoding method

Country Status (1)

Country Link
GB (1) GB2250372B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5631926A (en) * 1991-04-09 1997-05-20 Holness; Peter J. Apparatus for compressing data by providing a coded message indicative of the data and method of using same
JPH07121182A (en) * 1993-10-27 1995-05-12 Sony Corp Interruption information generating device and sound information processor

Also Published As

Publication number Publication date
GB9117591D0 (en) 1991-10-02
GB2250372A (en) 1992-06-03

Similar Documents

Publication Publication Date Title
GB2230132B (en) Signal recording method
US5299238A (en) Signal decoding apparatus
CA2160749A1 (en) Speech Coding Apparatus, Speech Decoding Apparatus, Speech Coding and Decoding Method and a Phase Amplitude Characteristic Extracting Apparatus for Carrying Out the Method
CA2194419A1 (en) Perceptual noise shaping in the time domain via lpc prediction in the frequency domain
ATE126413T1 (en) DIGITAL CODING PROCESS.
ATE188829T1 (en) METHOD AND DEVICE FOR REDUCING NOISE IN COMPRESSED IMAGE DATA
CA2197820A1 (en) Image Coded Data Re-Encoding Apparatus
DE69429499D1 (en) METHOD AND DEVICE FOR ENCODING OR DECODING SIGNALS AND RECORDING MEDIUM
KR940016074A (en) Digital Signal Processing Apparatus, Method and Recording Media
GR3033861T3 (en) Method for signalling a noise substitution during audio signal coding
CA2234078A1 (en) Method of and apparatus for coding audio signals
AU5641694A (en) Methods and apparatus for recording, reproducing, transmitting and/or receiving compressed data and recording medium therefor
WO1997007476A3 (en) Method and apparatus for formatting digital audio data
EP0993733B1 (en) Lossless encoding/decoding in a transmission system
EP0283167A3 (en) Audio digital/analog encoding and decoding
KR20020002241A (en) Digital audio system
GB2250372B (en) Data compressing and encoding method
JPH09127995A (en) Signal decoding method and signal decoder
CA2048882A1 (en) Image data processing method and apparatus
DE3881869D1 (en) DIGITAL ADAPTIVE TRANSFORMATION ENCODING METHOD.
GB9117595D0 (en) Signal processing method
CA2131980A1 (en) Picture compression apparatus, picture reproducing apparatus and picture drawing apparatus
GB2247981B (en) Method for producing a digital signal
GB2247337A (en) Data compression of decaying musical instrument sounds for a digital sampling system
GB9117593D0 (en) Signal processing method

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20091115