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GB828424A - Improvements in and relating to speech signal transmission systems - Google Patents

Improvements in and relating to speech signal transmission systems

Info

Publication number
GB828424A
GB828424A GB28430/58A GB2843058A GB828424A GB 828424 A GB828424 A GB 828424A GB 28430/58 A GB28430/58 A GB 28430/58A GB 2843058 A GB2843058 A GB 2843058A GB 828424 A GB828424 A GB 828424A
Authority
GB
United Kingdom
Prior art keywords
band
speech
range
sept
modulator
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
GB28430/58A
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB828424A publication Critical patent/GB828424A/en
Expired legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

828,424. Speech transmission. INTERNATIONAL BUSINESS MACHINES CORPORATION. Sept. 4, 1958 [Sept. 4, 1957], No. 28430/58. Class 40 (4). For the transmission of speech over a channel limited to the range 0-4 kc. the band 4-8 kc. which contains important tonal components of most consonants is shifted to that range and transmitted with the normal 0-4 kc. speech band to a receiver where no further conversion takes place. In Fig. 4, the whole band 0-8 kc. is fed over parallel paths A, B, one containing a modulator 14 supplied with a carrier frequency of 8 kc. and the other an attenuator 13 giving the same attenuation as the modulator. The combined output passes through a lowpass filter 34 cutting off at 4 kc. The 4-8 kc. band is thus folded over the 0-4 kc. band. In Fig. 5 (not shown), the path B is restricted to the range 4-8 kc. and a carrier of 4 kc. is used, so that the 4-8 kc. band is shifted without inversion. In Fig. 6, the speech band passes through a gating circuit 37 and low-pass filter 38, the former being controlled by 8 kc. pulses so that the 4-8 kc. band is in effect modulated to produce a 0-4 kc. lower side-band. This arrangement is described more precisely with reference to Fig. 7 (not shown). Specification 142,115 is referred to.
GB28430/58A 1957-09-04 1958-09-04 Improvements in and relating to speech signal transmission systems Expired GB828424A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US681989A US3069506A (en) 1957-09-04 1957-09-04 Consonant response in narrow band transmission

Publications (1)

Publication Number Publication Date
GB828424A true GB828424A (en) 1960-02-17

Family

ID=24737731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28430/58A Expired GB828424A (en) 1957-09-04 1958-09-04 Improvements in and relating to speech signal transmission systems

Country Status (2)

Country Link
US (1) US3069506A (en)
GB (1) GB828424A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2134135A1 (en) * 1971-04-21 1972-12-08 Cit Alcatel
US4315105A (en) * 1976-11-23 1982-02-09 Miller Iii Herman P Narrow band transmission system and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914554A (en) * 1973-05-18 1975-10-21 Bell Telephone Labor Inc Communication system employing spectrum folding
US4314104A (en) * 1976-12-13 1982-02-02 Vbc, Inc. Narrow band voice modulator system
US4255620A (en) * 1978-01-09 1981-03-10 Vbc, Inc. Method and apparatus for bandwidth reduction
CA1103587A (en) * 1978-07-27 1981-06-23 Herman P. Miller, Iii Narrow band transmission system and method
US10017320B2 (en) 2012-04-09 2018-07-10 Danny Wallis Enclosure and method for forming an enclosure

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2536664A (en) * 1945-09-10 1951-01-02 Rca Corp Stereophonic sound system for recordings
US2576115A (en) * 1947-02-07 1951-11-27 Int Standard Electric Corp Arrangement for transmitting electric signals occupying a wide frequency band over narrow band circuits
US2629017A (en) * 1949-05-20 1953-02-17 Bell Telephone Labor Inc Speech transmission system
NL157267B (en) * 1949-12-01 Nattrass Frank BAG FOR TRANSPORTING STORM MATERIAL.
US2779020A (en) * 1950-01-24 1957-01-22 Padevco Inc Frequency modulated multiplex systems
US2708268A (en) * 1951-03-16 1955-05-10 Products And Licensing Corp Sequential phase-shifted amplitude modulated carrier wave
NL90521C (en) * 1951-04-28 1959-02-18 Philips Nv Transmission system of stereophonic signals as well as transmitters and receivers to be used in this transmission system
US2810787A (en) * 1952-05-22 1957-10-22 Itt Compressed frequency communication system
BE544453A (en) * 1955-01-17

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2134135A1 (en) * 1971-04-21 1972-12-08 Cit Alcatel
US4315105A (en) * 1976-11-23 1982-02-09 Miller Iii Herman P Narrow band transmission system and method

Also Published As

Publication number Publication date
US3069506A (en) 1962-12-18

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