ES455836A1 - Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder - Google Patents

Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder

Info

Publication number
ES455836A1
ES455836A1 ES455836A ES455836A ES455836A1 ES 455836 A1 ES455836 A1 ES 455836A1 ES 455836 A ES455836 A ES 455836A ES 455836 A ES455836 A ES 455836A ES 455836 A1 ES455836 A1 ES 455836A1
Authority
ES
Spain
Prior art keywords
baseband
vocoder
signals
interference
circuit arrangement
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
ES455836A
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 ES455836A1 publication Critical patent/ES455836A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/662—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using a time/frequency relationship, e.g. time compression or expansion

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

If the baseband of baseband vocoder signals transmitted as modulation by AM transmitters is intended to be received free from interference even by conventional AM receivers, the coded amplitude signals and synchronisation signals must not be audible, the masking effect having to be taken into account here. Since the synchronisation signals are also transmitted in signal pauses, their level must be very low, which leads to separation difficulties during demodulation by vocoder receivers. The phase of the carrier of the synchronisation signals is therefore shifted by means of the phase shifter (PS) through 90 DEG in relation to the phase of the carrier of the coded amplitude signals.
ES455836A 1976-02-11 1977-02-11 Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder Expired ES455836A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2605306A DE2605306C2 (en) 1976-02-11 1976-02-11 Method and circuit arrangement for interference-free reception of the baseband of a baseband vocoder

Publications (1)

Publication Number Publication Date
ES455836A1 true ES455836A1 (en) 1978-02-16

Family

ID=5969560

Family Applications (1)

Application Number Title Priority Date Filing Date
ES455836A Expired ES455836A1 (en) 1976-02-11 1977-02-11 Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder

Country Status (7)

Country Link
CH (1) CH615543A5 (en)
DE (1) DE2605306C2 (en)
ES (1) ES455836A1 (en)
GB (1) GB1520715A (en)
IE (1) IE44880B1 (en)
IT (1) IT1078063B (en)
ZA (1) ZA77674B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811454A1 (en) * 1978-03-14 1979-09-20 Hertz Inst Heinrich Reproduction method improving quality of frequency band limited speech - by adding stored spectral signals derived from full range prototype
BE1007617A3 (en) * 1993-10-11 1995-08-22 Philips Electronics Nv Transmission system using different codeerprincipes.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2309987C2 (en) * 1973-02-28 1982-05-13 Standard Elektrik Lorenz Ag, 7000 Stuttgart System for the transmission of broadband signals

Also Published As

Publication number Publication date
DE2605306A1 (en) 1977-08-18
GB1520715A (en) 1978-08-09
DE2605306C2 (en) 1983-09-08
IE44880B1 (en) 1982-05-05
IT1078063B (en) 1985-05-08
ZA77674B (en) 1978-01-25
CH615543A5 (en) 1980-01-31
IE44880L (en) 1977-08-11

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