US3778558A - Method and arrangement for sound track recording in which background music is damped during speech signals - Google Patents

Method and arrangement for sound track recording in which background music is damped during speech signals Download PDF

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Publication number
US3778558A
US3778558A US00168553A US3778558DA US3778558A US 3778558 A US3778558 A US 3778558A US 00168553 A US00168553 A US 00168553A US 3778558D A US3778558D A US 3778558DA US 3778558 A US3778558 A US 3778558A
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Prior art keywords
signals
sound
sound signals
dominant
recording
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US00168553A
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English (en)
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R Wick
A Brath
E Wagensonner
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Agfa Gevaert AG
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Agfa Gevaert AG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means

Definitions

  • This invention relates to a method and arrangement for recording dominant and background sounds on a sound track, as for example, a sound track associated with a film.
  • This sound track is generally a track on a magnetic tape and the dominant sound may for exam ple be speech, while the background sound is music.
  • the method of the presentinvention comprises a method for recording dominant and background sound' any correction required'in said recording does not affect the background sound whichhas not yet been recorded. Once the dominant sound signal has been recorded on the tape, then the background sound signals (music) can be added automatically and without interruption.
  • the arrangement of the present invention serves to damp the background sounds automatically in the presence of dominant sound signals recorded on the sound track.
  • the arrangement of the present invention is an arrangement for recording background sound signals on a sound track havingpredetermined portions with recorded dominant sound signals. It comprises transport means transporting said sound track along .-a predetermined path past a first location and a second location following said first location in the direction of movement of said sound track. It comprises sensing means, at said first location, in operative proximity to said sound track for furnishingsensed .dominant sound signals in response to said recorded dominantsound signals. It comprises recording means at said second location, and damping means connected to said recording means for dampingsaid background sound signals upon activation. Finally, activating means activate said damping means in response to said sensed dominant sound signals.
  • the damping means serve to decrease the intensity of the background sound signals at the recording head to a great degree.
  • the damping means may comprise a field-effect transistor having a drain-source circuit connected in series with the coil of the recording head. Further, the gate of the field-ffect transistor may be connected with an RC timing circuit.
  • the activating means may comprise switch- 0 ing means which start the operation of the timing circuit either-for charging or discharging the capacitor of the RC timing circuit.
  • the switching means may be arelay having contacts connected to. the timing circuit.
  • the field effecttransistor In the absence of dominant sound signals, the field effecttransistor isfully conductive so that its sourcedrain circuit has a very low ohmic value. Therefore enough current flows through the coil of the recording head for recording the background sound at full strength. If however dominant sound signals are sensed on the sound track, the activating means, for example, a relay which opens its contacts, cause the timing circuit to furnish a voltage at 'the gate of the field-effect transistor which causes the field-effect transistor to become blocked, thus cutting off the current to the coil of the recording head. Thus the background sound cannot then reach the sound track.
  • the activating means for example, a relay which opens its contacts
  • the discharge time must be such'that the field-effect transistor is blocked in a time equal to or less thanthe time it takes any given pointon the sound track to travel from the first 'to the second location, that is from the location at which the dominant sound signals are sensed to' the location where thebackground sound is bein'g 'recorded.
  • the charging time'of the capacitor determines when the field-effect transistor againzbecomes conductive, then the charging time must be such that it is equal to or greater than the time required for any given point onthe sound track to travel from the sensing to therecording-location.
  • the length of sound track between the-sensing and recording location is less than the length of the portions of the sound track which have dominant sound'signals recorded thereon. This of course is generally the case in practice.
  • the relay can have a built-in time delay which allows a normally closed contact to close only a predetermined time interval after the deenergization of the relay.
  • the field-effect transistor becomes effective only after the end of the sound track portion carrying recorded dominant sound signals has-past the recording head.
  • FIGURE shows a recording arrangement in accordance with the present invention.
  • a film, 1 has a sound track which is transported in the direction of the arrow A.
  • the sound track is of course transported with the film.
  • Reference numeral 2 refers to a projection lamp, while reference numeral 3 denotes an objective lens.
  • Preceding the projection lamp in the direction of movement of the film is a sensing head 4 whose coil is denoted by reference numeral 5.
  • Coil 5 is situated in the input circuit of an amplifier 6 whose output energizes a relay coil 7.
  • a recording head 8 having a coil 9.
  • Coil 9 is in series with the source-drain circuit of field-effect transistor 10.
  • the drain of the field-effect transistor is denoted by reference numeral 100
  • the source is denoted by reference numerals 10b
  • the gate by reference numeral 100.
  • Gate 100 is connected with a capacitor 11.
  • a resistance 12, a discharge resistance, is connected in parallel with condensor 11 which is a timing condensor.
  • a resistance 13 is connected in series with resistance 12. This is a charging resistance.
  • the free terminal of resistance 13 is connected to a pair of contacts 14 which are the contacts associated with relay coil 7 and are normally closed contacts. When closed, these contacts connect the free terminal of re sistance 13 to the negative terminal of a voltage supply 16 via a switch 15.
  • Coil 9 of the recording head is further connected to the output of an amplifier 17 which has an input denoted by E.
  • Coil 9 is further connected to the outputs of a high-frequency oscillator 18.
  • Oscillator 18, as well as amplifier 17, are energized when switch is closed.
  • reference numeral 19 denotes a microphone
  • reference numeral 20 denotes a record player.
  • microphone 19 is connected to the input E of amplifier 17.
  • Switch 15 is then closed and the dominant sound signals are recorded via microphone 19 at predetermined portions of the sound track associated with the film.
  • contacts 14 are closed, a negative potential exists at the gate 10c of the field-effect transistor 10.
  • the field-effect transistor is thus highly conductive and the current required for full-strength recording flows through coil 9.
  • the film After the recording of the dominant sound signals, the film is re-wound (apparatus not shown) and the recording of the background soundsignals, in this instance music, commences.
  • the fieldeffect transistor may become completely blocked causing the background music to be eliminated completely or, alternatively, it may become only partially blocked (high resistance) thereby causing the background music to be diminished, but not completely eliminated.
  • Capacitor 11 then commences to charge via resistance 13 at a time constant determined by the value of capacitor 11 and resistance 14. During the charging process, the resistance of the drain-source circuit of field-effect transistor 10 becomes less and less so that the current through coil 9 increases, causing the recorded strength of background sound signals to increase correspondingly.
  • the recording of the background sound signals which may for example be derived from record player 20, proceeds at fullstrength.
  • an overlapping of dominant and background sound signals is thus prevented by first making the drop-out time of relay 7 longer than the time required for any given point on the sound track to travel between the first and second location.
  • the discharge time of capacitor 11 is made smaller or equal to the time required for any point on the sound track to travel from the first to the second location thereby ensuring that the background music is damped prior to the arrival of portions of sound track having dominant sound signals at the recording location. Overlapping of dominant and background sound signals is thus prevented.
  • relays having a determined drop-out time it is possible to utilize a relay having substantially immediate drop out upon de-energization in conjunction with a charging circuit (resistance 13, capacitor 11) whose RC time constant is such that sufficient damping still prevails when the end of the sound track portion carrying dominant sound signals passes the recording location.
  • the individual portions of sound track having dominant sound signals should exceed individually the distance between the first and second location.
  • Method for recording dominant and background sound signals on a sound track comprising, in combination, the steps of first recording said dominant sound signals on predetermined portions of said sound track, in such a manner that said sound track has at least a first and second portion with recorded dominant sound signals separated by at least one further predetermined portion having no recorded signals; subsequently furnishing said background sound signals substantially continuously; converting said so-furnished background sound signals into corresponding electrical signals; scanning said sound track during said furnishing of said background sound signals and following said recording of said dominant sound signals in such a manner that each portion of said sound track is scanned a predetermined time interval prior to the recording on said portion of said electrical signals; furnishing sensed dominant sound signals in response to so-scanned recorded dominant sound signals; decreasing the amplitude of said electrical signals in response to said sensed dominant sound signals, while maintaining the amplitude of said electrical signals in the absence of said sensed dominant sound signals; and continuously recording said electrical signals, whereby said background sound signals are damped for portions of said sound track having recorded dominant sound signals.
  • Arrangement for recording background sound signals on a sound track having predetermined portions with dominant sound signals recorded thereon and further predetermined portions having no signals recorded thereon comprising, in combination, transport means transporting said sound track along a predetermined path past a first location and a second location following said first location in the direction of movement of said sound track; sensing means located at said first location in operative proximity to said sound track for furnishing electrical sensed dominant sound signals in response to said recorded dominant sound signals; means for furnishing background sound signals and transducing said background sound signals into corresponding electrical background signals; damping circuit means for decreasing the amplitude of said electrical background signals upon activation; activating means for activating said damping circuit means in response to said sensed dominant sound signals and for deactivating said damping circuit means in the absence of said sensed dominant sound signals, whereby said 6 damping circuit means furnish damping output signals corresponding to said background sound signals, but having an amplitude varying in dependence upon the absence and presence of said sensed dominant sound signals; and recording means located at said second lo cation for continuously recording said damp
  • activating means comprise switching means having a first state in the presence of said electrical sensed dominant sound signals and a second state in the absence of sensed dominant sound signals.
  • said recording means comprise a recording head having a coil; and wherein said damping circuit means comprise a field-effect transistor having a drain-source cir cuit series connected with said coil, and a gate; and timing circuit means interconnecting said gate and said switching means.
  • said switching means comprise a relay having relay contacts connected to said timing circuit means.
  • timing circuit means comprises a capacitor having a charging time and a discharged time; wherein said transport means transports said sound track along said predetermined path at a velocity whereat a given point on said sound track requires a determined time interval to travel from said first location to said second location; and wherein said determined time interval is less than or equal to said charging and discharge time.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)
US00168553A 1970-08-08 1971-08-03 Method and arrangement for sound track recording in which background music is damped during speech signals Expired - Lifetime US3778558A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2039461A DE2039461C3 (de) 1970-08-08 1970-08-08 Tonfilmgerät zum Vertonen von Filmen

Publications (1)

Publication Number Publication Date
US3778558A true US3778558A (en) 1973-12-11

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ID=5779201

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US00168553A Expired - Lifetime US3778558A (en) 1970-08-08 1971-08-03 Method and arrangement for sound track recording in which background music is damped during speech signals

Country Status (5)

Country Link
US (1) US3778558A (enrdf_load_stackoverflow)
JP (2) JPS5132961B1 (enrdf_load_stackoverflow)
DE (1) DE2039461C3 (enrdf_load_stackoverflow)
FR (1) FR2103838A5 (enrdf_load_stackoverflow)
GB (1) GB1364545A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095261A (en) * 1976-01-07 1978-06-13 Jesus Rodriguez Audio tape recorder, editor and amplifying system
US4097906A (en) * 1975-04-10 1978-06-27 Karl Vockenhuber Inter-record gap recording or playback apparatus
US4208108A (en) * 1976-12-13 1980-06-17 Canon Kabushiki Kaisha Sound motion picture projector
US5189562A (en) * 1990-06-25 1993-02-23 Greene Leonard M System and method for combining language translation with original audio on video or film sound track
US5414569A (en) * 1991-10-04 1995-05-09 Sony Corporation Magnetic recording apparatus with selective recording of auxiliary audio signal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614783C3 (de) * 1976-04-06 1987-07-09 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Tonaufnahmegerät mit automatischer Pegelregelung
DE2649031C2 (de) * 1976-10-28 1983-03-03 Agfa-Gevaert Ag, 5090 Leverkusen Tonfilmprojektor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885487A (en) * 1958-07-11 1959-05-05 Carlos C Rivas Film editing machine
US2885485A (en) * 1956-06-22 1959-05-05 Eigen David Sound editing device
US3030441A (en) * 1958-07-28 1962-04-17 Otto R Nemeth Method and apparatus for editing television tape
US3157749A (en) * 1960-10-15 1964-11-17 Agfa Ag Method and apparatus for superimposing an additional recording upon an existing sound record
US3475564A (en) * 1966-11-08 1969-10-28 Minnesota Mining & Mfg System for selectively reproducing signals recorded at different levels
US3663764A (en) * 1970-04-06 1972-05-16 Ampex Automatic tracking circuit for transverse scan magnetic tape transport

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT247638B (de) * 1963-06-21 1966-06-27 Eumig Einrichtung zur magnetischen Tonaufzeichnung
JPS429860Y1 (enrdf_load_stackoverflow) * 1965-04-03 1967-05-30
DE1499600B2 (de) * 1966-10-12 1970-11-12 Bavaria Atelier Gesellschaft mbH, 8000 München Vorrichtung zur Voranzeige einer Modulation
JPS49128211U (enrdf_load_stackoverflow) * 1973-03-01 1974-11-02
JPS5132961A (ja) * 1974-09-13 1976-03-19 Hitachi Ltd Patsufuaagatagasushadanki

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885485A (en) * 1956-06-22 1959-05-05 Eigen David Sound editing device
US2885487A (en) * 1958-07-11 1959-05-05 Carlos C Rivas Film editing machine
US3030441A (en) * 1958-07-28 1962-04-17 Otto R Nemeth Method and apparatus for editing television tape
US3157749A (en) * 1960-10-15 1964-11-17 Agfa Ag Method and apparatus for superimposing an additional recording upon an existing sound record
US3475564A (en) * 1966-11-08 1969-10-28 Minnesota Mining & Mfg System for selectively reproducing signals recorded at different levels
US3663764A (en) * 1970-04-06 1972-05-16 Ampex Automatic tracking circuit for transverse scan magnetic tape transport

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097906A (en) * 1975-04-10 1978-06-27 Karl Vockenhuber Inter-record gap recording or playback apparatus
US4095261A (en) * 1976-01-07 1978-06-13 Jesus Rodriguez Audio tape recorder, editor and amplifying system
US4208108A (en) * 1976-12-13 1980-06-17 Canon Kabushiki Kaisha Sound motion picture projector
US5189562A (en) * 1990-06-25 1993-02-23 Greene Leonard M System and method for combining language translation with original audio on video or film sound track
US5414569A (en) * 1991-10-04 1995-05-09 Sony Corporation Magnetic recording apparatus with selective recording of auxiliary audio signal

Also Published As

Publication number Publication date
DE2039461C3 (de) 1984-06-20
JPS5132961B1 (enrdf_load_stackoverflow) 1976-09-16
JPS5340523A (en) 1978-04-13
DE2039461B2 (de) 1980-03-06
JPS571041B2 (enrdf_load_stackoverflow) 1982-01-09
DE2039461A1 (de) 1972-02-17
FR2103838A5 (enrdf_load_stackoverflow) 1972-04-14
GB1364545A (en) 1974-08-21

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