GB626157A - Improvements in or relating to sterophonic sound-recording - Google Patents

Improvements in or relating to sterophonic sound-recording

Info

Publication number
GB626157A
GB626157A GB7450/47A GB745047A GB626157A GB 626157 A GB626157 A GB 626157A GB 7450/47 A GB7450/47 A GB 7450/47A GB 745047 A GB745047 A GB 745047A GB 626157 A GB626157 A GB 626157A
Authority
GB
United Kingdom
Prior art keywords
channel
frequency
track
tones
frequency tones
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
GB7450/47A
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 Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB626157A publication Critical patent/GB626157A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

626,157. Stereophonic recording. PHILIPS LAMPS, Ltd. March 18, 1947, No. 7450. Convention date, June 6, 1944. [Class 40 (ii)] [Also in Group XXXIX] The high-frequency tones of one channel of a stereophonic recording device are recorded in a first track and the high-frequency tones of the second channel together with the low-frequency tones of both channels are recorded in the second track, the first track having additionally one or more auxiliary records of audible frequency, less than the lowest frequency of the high-frequency tones. Two spaced microphones M1, M2 feed amplifiers V1, V2, the outputs of which are fed in phase opposition to the tubes B1, B2 of a push-pull amplifier. The primary windings of transformers T1, T2, have low inductance so as to pass only the highfrequency tones to the cutting styluses S1, S2, the polarity of the first channel being restored at K2. The primary of transformer T3 is shunted by condensers C to pass the combined low-frequencies to the stylus S1, and the auxiliary record on channel 3, preferably of 250 to 600 c/s., is added to the stylus S2.
GB7450/47A 1944-06-06 1947-03-18 Improvements in or relating to sterophonic sound-recording Expired GB626157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL626157X 1944-06-06

Publications (1)

Publication Number Publication Date
GB626157A true GB626157A (en) 1949-07-11

Family

ID=19788577

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7450/47A Expired GB626157A (en) 1944-06-06 1947-03-18 Improvements in or relating to sterophonic sound-recording

Country Status (1)

Country Link
GB (1) GB626157A (en)

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