GB583246A - Improvements in or relating to electrical arrangements for selecting individual components of a complex wave - Google Patents

Improvements in or relating to electrical arrangements for selecting individual components of a complex wave

Info

Publication number
GB583246A
GB583246A GB1349644A GB1349644A GB583246A GB 583246 A GB583246 A GB 583246A GB 1349644 A GB1349644 A GB 1349644A GB 1349644 A GB1349644 A GB 1349644A GB 583246 A GB583246 A GB 583246A
Authority
GB
United Kingdom
Prior art keywords
band
oscillator
frequency
modulator
filter
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
GB1349644A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1349644A priority Critical patent/GB583246A/en
Priority to FR924974D priority patent/FR924974A/en
Publication of GB583246A publication Critical patent/GB583246A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Abstract

583,246. Generating high frequency oscillations. STANDARD TELEPHONES & CABLES, Ltd., and DALY, C. T. July 14, 1944, No. 13496. [Class 40 (v)] [Also in Group XXXVI] An arrangement for selecting a band of frequencies of a given width from any part of a relatively wide band of frequencies contained in a complex wave is shown in the Figure. The complex wave is passed through a low-pass filter F1 which cuts off higher frequencies than those desired, and the resultant wave is mixed in a balanced modulator M1 with carrier waves from source O1 of at least twice the cut-off frequency of the filter F1. The output from the modulator M1 is applied to a circuit SC adapted to select the upper side-band and apply it to a demodulator D1 which is also fed from the oscillator O1 The upper side-band of the output from the demodulator D1 is cut off by filter F3 whilst the desired band at its correct frequency.is passed. Within the selective circuit SC the upper side-band of the output of the modulator M1 is passed by filter F2 and fed to modulator M2 which is supplied by oscillator 02 of fixed frequency. The lower side-band of this modulator M2 is of low enough frequency to enable easy selection of the required band by means of a filter SF. This component is fed to demodulator D2 supplied by oscillator O2 and the upper sideband is filtered by filter F4 and so passed to the demodulator D1. The components of the selective circuit can be non-variable, since the frequency of the upper side-band, of the output of the modulator M1 may be kept the same for all input frequencies by suitable adjustment of the frequency of the oscillator O1. Fig. 2 (not shown) illustrates an arrangement for the calibration of a beat frequency oscillator using a fixed and variable oscillator, in which the latter takes the place of the oscillator O1. The output from the beat frequency oscillator and from the selective arrangement are fed to the plates of an oscillograph which indicates the various calibration points when a steady 1 : 1 Lissajou figure is obtained. Specification 576,192, [Group XX], is referred to.
GB1349644A 1944-07-14 1944-07-14 Improvements in or relating to electrical arrangements for selecting individual components of a complex wave Expired GB583246A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1349644A GB583246A (en) 1944-07-14 1944-07-14 Improvements in or relating to electrical arrangements for selecting individual components of a complex wave
FR924974D FR924974A (en) 1944-07-14 1946-02-08 Electrical device for making the selection of individual components of a complex wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1349644A GB583246A (en) 1944-07-14 1944-07-14 Improvements in or relating to electrical arrangements for selecting individual components of a complex wave

Publications (1)

Publication Number Publication Date
GB583246A true GB583246A (en) 1946-12-12

Family

ID=10024017

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1349644A Expired GB583246A (en) 1944-07-14 1944-07-14 Improvements in or relating to electrical arrangements for selecting individual components of a complex wave

Country Status (2)

Country Link
FR (1) FR924974A (en)
GB (1) GB583246A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1184874B (en) * 1955-12-30 1965-01-07 Beckman Instruments Inc Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness
GB2233520A (en) * 1988-12-19 1991-01-09 British Aerospace Frequency filtering apparatus
GB2328814A (en) * 1997-09-02 1999-03-03 Sony Uk Ltd Variable bandwidth filter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1184874B (en) * 1955-12-30 1965-01-07 Beckman Instruments Inc Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness
GB2233520A (en) * 1988-12-19 1991-01-09 British Aerospace Frequency filtering apparatus
GB2233520B (en) * 1988-12-19 1992-05-27 British Aerospace Frequency filtering apparatus
GB2328814A (en) * 1997-09-02 1999-03-03 Sony Uk Ltd Variable bandwidth filter
GB2328814B (en) * 1997-09-02 2001-09-26 Sony Uk Ltd Variable bandwidth filter

Also Published As

Publication number Publication date
FR924974A (en) 1947-08-21

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