HK5978A - Improvements in or relating to voice frequency receiver - Google Patents

Improvements in or relating to voice frequency receiver

Info

Publication number
HK5978A
HK5978A HK5978A HK5978A HK5978A HK 5978 A HK5978 A HK 5978A HK 5978 A HK5978 A HK 5978A HK 5978 A HK5978 A HK 5978A HK 5978 A HK5978 A HK 5978A
Authority
HK
Hong Kong
Prior art keywords
relating
frequency receiver
voice frequency
voice
receiver
Prior art date
Application number
HK5978A
Inventor
N A F Williams
Original Assignee
Standard Telephones Cables Ltd
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 Standard Telephones Cables Ltd filed Critical Standard Telephones Cables Ltd
Publication of HK5978A publication Critical patent/HK5978A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
HK5978A 1974-10-29 1978-01-26 Improvements in or relating to voice frequency receiver HK5978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4674574A GB1479166A (en) 1974-10-29 1974-10-29 Voice frequency receiver

Publications (1)

Publication Number Publication Date
HK5978A true HK5978A (en) 1978-02-03

Family

ID=10442428

Family Applications (1)

Application Number Title Priority Date Filing Date
HK5978A HK5978A (en) 1974-10-29 1978-01-26 Improvements in or relating to voice frequency receiver

Country Status (3)

Country Link
GB (1) GB1479166A (en)
HK (1) HK5978A (en)
IE (1) IE41753B1 (en)

Also Published As

Publication number Publication date
IE41753L (en) 1976-04-29
IE41753B1 (en) 1980-03-12
GB1479166A (en) 1977-07-06

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