CA1224876A - Data compression system and method for audio signals - Google Patents

Data compression system and method for audio signals

Info

Publication number
CA1224876A
CA1224876A CA000455535A CA455535A CA1224876A CA 1224876 A CA1224876 A CA 1224876A CA 000455535 A CA000455535 A CA 000455535A CA 455535 A CA455535 A CA 455535A CA 1224876 A CA1224876 A CA 1224876A
Authority
CA
Canada
Prior art keywords
digital
filter means
reconstruction filter
compression
unit circle
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
CA000455535A
Other languages
English (en)
French (fr)
Inventor
Charles S. Weaver
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.)
SRI International Inc
Original Assignee
SRI International Inc
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 by SRI International Inc filed Critical SRI International Inc
Application granted granted Critical
Publication of CA1224876A publication Critical patent/CA1224876A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0223—Computation saving measures; Accelerating measures
    • H03H17/0227—Measures concerning the coefficients
    • H03H17/023—Measures concerning the coefficients reducing the wordlength, the possible values of coefficients
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0248—Filters characterised by a particular frequency response or filtering method
    • H03H17/0264—Filter sets with mutual related characteristics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7232—Signal processing specially adapted for physiological signals or for diagnostic purposes involving compression of the physiological signal, e.g. to extend the signal recording period

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Computing Systems (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
CA000455535A 1983-12-12 1984-05-31 Data compression system and method for audio signals Expired CA1224876A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56061083A 1983-12-12 1983-12-12
US560,610 1983-12-12

Publications (1)

Publication Number Publication Date
CA1224876A true CA1224876A (en) 1987-07-28

Family

ID=24238541

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000455535A Expired CA1224876A (en) 1983-12-12 1984-05-31 Data compression system and method for audio signals

Country Status (6)

Country Link
JP (1) JPS61500998A (de)
CA (1) CA1224876A (de)
DE (2) DE3490580T (de)
GB (1) GB2165426B (de)
NL (1) NL8420060A (de)
WO (1) WO1985002529A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802222A (en) * 1983-12-12 1989-01-31 Sri International Data compression system and method for audio signals
DE3602808A1 (de) * 1986-01-30 1987-08-06 Siemens Ag Codiereinrichtung fuer variable wortlaengen
DE3605032A1 (de) * 1986-02-18 1987-08-20 Thomson Brandt Gmbh Verfahren zur digitalen nachrichtenuebertragung
US4882754A (en) * 1987-08-25 1989-11-21 Digideck, Inc. Data compression system and method with buffer control
GB2511479A (en) * 2012-12-17 2014-09-10 Librae Ltd Interacting toys

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098267A (en) * 1977-07-05 1978-07-04 Clinical Data, Inc. System for display and analysis of physiological signals such as electrocardiographic (ECG) signals
US4449536A (en) * 1980-10-31 1984-05-22 Sri International Method and apparatus for digital data compression
US4396906A (en) * 1980-10-31 1983-08-02 Sri International Method and apparatus for digital Huffman encoding

Also Published As

Publication number Publication date
WO1985002529A1 (en) 1985-06-20
GB8519232D0 (en) 1985-09-04
DE3490580T (de) 1986-01-23
GB2165426A (en) 1986-04-09
JPS61500998A (ja) 1986-05-15
DE3490580C2 (de) 1993-03-04
NL8420060A (nl) 1985-11-01
GB2165426B (en) 1988-01-13

Similar Documents

Publication Publication Date Title
US4802222A (en) Data compression system and method for audio signals
US4754483A (en) Data compression system and method for audio signals
JP3940165B2 (ja) オーディオ用低ビットレート高分解能スペクトル包絡線符号化
KR101019678B1 (ko) 저비트율 오디오 코딩
US4704730A (en) Multi-state speech encoder and decoder
EP0702368A2 (de) Verfahren zur Aufnahme und Wiedergabe digitaler Audiosignale und Apparat dafür
EP0610975A2 (de) Formatierung eines kodierten Signals für Kodierer und Dekodierer eines Audiosystems hoher Qualität
EP0345608A2 (de) Verfahren und System für Datenkomprimierung mit Puffersteuerung
EP0004759B1 (de) Verfahren und Einrichtung zur Kodierung und Wiederherstellung von Signalen
GB2160040A (en) Method and system for decoding a digital signal using a variable frequency low-pass filter
US6370507B1 (en) Frequency-domain scalable coding without upsampling filters
CA2139095C (en) Real-time digital audio compression/decompression system
JPH0897806A (ja) データ復元装置、システム及び方法
CA1224876A (en) Data compression system and method for audio signals
US6256652B1 (en) Binary code compression and decompression and parallel compression and decompression processor
US5298899A (en) PCM encoder and decoder using exkrema
EP0185095B1 (de) Übertragungsanordnung digitaler signale
US3772682A (en) Digital conversion from one pcm format to another
US4231101A (en) Digital filter arrangement for non-uniformly quantized PCM
US4622537A (en) Predictive code conversion method capable of forcibly putting a feedback loop in an inactive state
US4501001A (en) Variable slope delta coding processor using adaptive prediction
US6029129A (en) Quantizing audio data using amplitude histogram
JPS58197918A (ja) 適応差分復号器
JPS5979651A (ja) 信号伝送方式およびその装置
EP0085297A2 (de) Deltamodulator hoher Qualität

Legal Events

Date Code Title Description
MKEX Expiry