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ES409984A1 - Speech transmission system - Google Patents

Speech transmission system

Info

Publication number
ES409984A1
ES409984A1 ES409984A ES409984A ES409984A1 ES 409984 A1 ES409984 A1 ES 409984A1 ES 409984 A ES409984 A ES 409984A ES 409984 A ES409984 A ES 409984A ES 409984 A1 ES409984 A1 ES 409984A1
Authority
ES
Spain
Prior art keywords
signal
filter
elements
excitation
information
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
ES409984A
Other languages
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES409984A1 publication Critical patent/ES409984A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A transmission system that includes, on the transmitter side, a self-adaptive filter as described above, connected in a negative feed configuration and in the path of the voice signal. The voice input signal to the filter is also the reference signal. The filter output signal is subtracted from the voice input signal giving a residual signal. Elements to determine the excitation information of the voice input in the residual signal. Elements to digitally encode the information related to the values of the computed coefficients of the autoadaptable filter. On the receiver side there are elements to decode the encoded excitation information, elements to generate an excitation signal from the decoded excitation information, an adaptive cross filter to which the excitation signal is applied, an adaptive cross filter connected in a positive feedback configuration such that its output signal is added to the drive signal, and elements to decode the encoded coefficient information. Said decoded coefficient information is used to control the responses of the adaptive filter. The adaptive filter input is the receiver's voice output. (Machine-translation by Google Translate, not legally binding)
ES409984A 1971-12-23 1972-12-22 Speech transmission system Expired ES409984A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5993271A GB1356649A (en) 1971-12-23 1971-12-23 Speech transmission system

Publications (1)

Publication Number Publication Date
ES409984A1 true ES409984A1 (en) 1976-01-01

Family

ID=10484681

Family Applications (1)

Application Number Title Priority Date Filing Date
ES409984A Expired ES409984A1 (en) 1971-12-23 1972-12-22 Speech transmission system

Country Status (3)

Country Link
ES (1) ES409984A1 (en)
FR (1) FR2164813B3 (en)
GB (1) GB1356649A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130055B (en) * 1982-11-05 1986-08-06 Stc Plc A digital speech transmission system

Also Published As

Publication number Publication date
GB1356649A (en) 1974-06-12
FR2164813B3 (en) 1976-02-13
FR2164813A1 (en) 1973-08-03

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