IE44880L - Baseband vocoder - Google Patents

Baseband vocoder

Info

Publication number
IE44880L
IE44880L IE770290A IE29077A IE44880L IE 44880 L IE44880 L IE 44880L IE 770290 A IE770290 A IE 770290A IE 29077 A IE29077 A IE 29077A IE 44880 L IE44880 L IE 44880L
Authority
IE
Ireland
Prior art keywords
signals
baseband
vocoder
phase
receivers
Prior art date
Application number
IE770290A
Other versions
IE44880B1 (en
Original Assignee
Int Standard Electric 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
Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE44880L publication Critical patent/IE44880L/en
Publication of IE44880B1 publication Critical patent/IE44880B1/en

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. <IMAGE> [GB1520715A]
IE290/77A 1976-02-11 1977-02-10 Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder IE44880B1 (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 (2)

Publication Number Publication Date
IE44880L true IE44880L (en) 1977-08-11
IE44880B1 IE44880B1 (en) 1982-05-05

Family

ID=5969560

Family Applications (1)

Application Number Title Priority Date Filing Date
IE290/77A IE44880B1 (en) 1976-02-11 1977-02-10 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
ZA77674B (en) 1978-01-25
DE2605306C2 (en) 1983-09-08
CH615543A5 (en) 1980-01-31
ES455836A1 (en) 1978-02-16
GB1520715A (en) 1978-08-09
IE44880B1 (en) 1982-05-05
DE2605306A1 (en) 1977-08-18
IT1078063B (en) 1985-05-08

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