GB1506008A - Digital-signal modulation and filtering arrangement - Google Patents

Digital-signal modulation and filtering arrangement

Info

Publication number
GB1506008A
GB1506008A GB3703075A GB3703075A GB1506008A GB 1506008 A GB1506008 A GB 1506008A GB 3703075 A GB3703075 A GB 3703075A GB 3703075 A GB3703075 A GB 3703075A GB 1506008 A GB1506008 A GB 1506008A
Authority
GB
United Kingdom
Prior art keywords
frequency
carrier wave
filter
signal
derived
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
GB3703075A
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.)
PHILIPS Ltd
Original Assignee
PHILIPS 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
Priority claimed from SE7412095A external-priority patent/SE404206B/en
Application filed by PHILIPS Ltd filed Critical PHILIPS Ltd
Publication of GB1506008A publication Critical patent/GB1506008A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems

Landscapes

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

Abstract

1506008 Data transmission PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 9 Sept 1975 [12 Sept 1974] 37030/75 Heading H4P Digital data signals from a source 1 controlled by a clock 2 with a frequency f 1 , are sampled at the frequency f 1 by a device 4 having its output connected to a digital filter 3, each signal element being sampled once in order to ascertain whether it is a binary "1" or a binary "0". The filter 3 has a pass-band characteristic and is arranged to convert the signal samples at frequency f 1 into signal samples at a frequency f 2 , the latter being twice the frequency of a carrier wave derived from a source 6. The carrier wave is also sampled, at the frequency f 2 , and each signal sample at frequency f 2 is multiplied in a modulator 5 by a carrier wave sample. As the carrier wave samples, because of the frequency at which they are derived, can be represented in numerical form by the numbers + 1, - 1, + 1, -1, ..., the modulation process thus comprises an alternating inversion of the signal samples derived from the filter 3. The output from modulator 5 is applied over a D/A converter 7 and a filter 8 to a transmission line 9, and the Specification explains, with reference to Figs. 2a to 2d (not shown, how the information content of the original input signals is retained in the transmitted signal. The Specification states that the modulating and filtering arrangement may be applied to FSK, PSK and AM systems.
GB3703075A 1974-09-25 1975-09-09 Digital-signal modulation and filtering arrangement Expired GB1506008A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7412095A SE404206B (en) 1973-10-02 1974-09-25 PROCEDURE FOR THE MANUFACTURE OF FIBER STRUCTURES BY EXPANSION REQUIREMENT OF A MIXTURE OF INCOMPATIBLE POLYMERS

Publications (1)

Publication Number Publication Date
GB1506008A true GB1506008A (en) 1978-04-05

Family

ID=20322225

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3703075A Expired GB1506008A (en) 1974-09-25 1975-09-09 Digital-signal modulation and filtering arrangement

Country Status (1)

Country Link
GB (1) GB1506008A (en)

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Legal Events

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

Effective date: 19940909