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GB1214605A - Improvements in or relating to multiplex carrier telecommunications systems - Google Patents

Improvements in or relating to multiplex carrier telecommunications systems

Info

Publication number
GB1214605A
GB1214605A GB3667769A GB3667769A GB1214605A GB 1214605 A GB1214605 A GB 1214605A GB 3667769 A GB3667769 A GB 3667769A GB 3667769 A GB3667769 A GB 3667769A GB 1214605 A GB1214605 A GB 1214605A
Authority
GB
United Kingdom
Prior art keywords
frequency
harmonics
input
khz
harmonic output
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
GB3667769A
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of GB1214605A publication Critical patent/GB1214605A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

1,214,605. Frequency synthesizers; transistor frequency dividing circuits. SIEMENS A. G. July 22, 1969 [July 23, 1968|, No.36677/69. Headings H3F and H3T. Means for deriving channel carrier frequencies of between 112 and 156 kHz and the oscillator frequency 48 kHz for multiplex carrier telecommunication systems comprises a frequency multiplier 1, Fig. 2, from which the even and odd harmonics of an input frequency of 8 kHz can be obtained from separate outputs. The 6th, 14th, 16th and 18 harmonics are selected by individual filters 2 from the even harmonic output and the 15th, 17th and 19th harmonics are selected by individual filters 3 from the odd harmonic output. The 29th, 31st, 33rd, 35th, 37th and 39th harmonics from the odd harmonic output are fed to individual frequency dividers 8 which halve their input frequencies, the outputs of these frequency dividers being fed through individual filters 7. The frequency dividers each have an input transformer forming part of a filter designed to attenuate a frequency equal to half the input frequency; such a filter may be obtained by connecting a capacitor 4, Fig.4, in series with the transformer primary.
GB3667769A 1968-07-23 1969-07-22 Improvements in or relating to multiplex carrier telecommunications systems Expired GB1214605A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681762627 DE1762627B2 (en) 1968-07-23 1968-07-23 METHOD OF DERIVING THE CHANNEL CARRIER FREQUENCY FROM 112 TO 156 KHZ FOR A PRE-MODULATION CARRIER FREQUENCY SYSTEM

Publications (1)

Publication Number Publication Date
GB1214605A true GB1214605A (en) 1970-12-02

Family

ID=5697106

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3667769A Expired GB1214605A (en) 1968-07-23 1969-07-22 Improvements in or relating to multiplex carrier telecommunications systems

Country Status (7)

Country Link
JP (1) JPS4941924B1 (en)
AT (1) AT287794B (en)
BE (1) BE736444A (en)
CH (1) CH496362A (en)
DE (1) DE1762627B2 (en)
GB (1) GB1214605A (en)
NL (1) NL152728B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267791A (en) * 1992-05-28 1993-12-15 Mitsubishi Electric Corp Frequency divider

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2447045C3 (en) * 1974-10-02 1982-01-21 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method of deriving the channel carrier frequencies 112 to 156 kHz for a pre-modulation system
HU177519B (en) * 1978-12-22 1981-10-28 Telefongyar Frequency synthetiser for generating pilot signals and subcarriers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267791A (en) * 1992-05-28 1993-12-15 Mitsubishi Electric Corp Frequency divider
GB2267791B (en) * 1992-05-28 1996-06-19 Mitsubishi Electric Corp Frequency divider
US5729170A (en) * 1992-05-28 1998-03-17 Mitsubishi Denki Kabushiki Kaisha Frequency divider

Also Published As

Publication number Publication date
AT287794B (en) 1971-02-10
DE1762627A1 (en) 1970-09-17
JPS4941924B1 (en) 1974-11-12
DE1762627B2 (en) 1971-02-18
NL6910539A (en) 1970-01-27
NL152728B (en) 1977-03-15
BE736444A (en) 1970-01-23
CH496362A (en) 1970-09-15

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee