WO1994005135A1 - Separateur musical - Google Patents

Separateur musical Download PDF

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Publication number
WO1994005135A1
WO1994005135A1 PCT/GB1993/001785 GB9301785W WO9405135A1 WO 1994005135 A1 WO1994005135 A1 WO 1994005135A1 GB 9301785 W GB9301785 W GB 9301785W WO 9405135 A1 WO9405135 A1 WO 9405135A1
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WO
WIPO (PCT)
Prior art keywords
signal
audio
channel
output
isolator
Prior art date
Application number
PCT/GB1993/001785
Other languages
English (en)
Inventor
Mark Preece
Original Assignee
Mark Preece
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 Mark Preece filed Critical Mark Preece
Priority to AU47295/93A priority Critical patent/AU4729593A/en
Publication of WO1994005135A1 publication Critical patent/WO1994005135A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments

Definitions

  • the present invention relates to stereo signal processors for the field of sound reproduction, and in particular to a device for eliminating certain elements of a signal relating to a polyphonic musical arrangement eg. bass, drums, voice, in order to make more accessible other instrument notes or voices, to aid a listener in transcribing music form stereo recordings, and to aid in practising musical arrangements along to such recordings.
  • a polyphonic musical arrangement eg. bass, drums, voice
  • various instruments are “mixed” during production of the sound recording, so that certain instruments appear predominantly in one channel, (eg. a left channel) when the recording is played stereophonically, and other instruments appear predominantly in the other channel (eg. a right channel), when the recording is played on stereophonic equipment.
  • Other instruments are mixed such that when the recording is played, the instruments appear more or less equally in each channel, and can be heard as such.
  • FIG. 1 of the accompanying drawings there is shown a sound field of a stereo recording as known in the prior art, showing how a piece of music recorded in stereo is perceived to sound by a listener standing in front of a conventional stereo sound reproducing apparatus, having left and right loud speakers, or by a listener using a pair of stereo headphones.
  • a person listening to a stereo audio recording through a stereo sound reproducing apparatus having left and right speakers may hear a stereo sound field in which, for example the sounds of a rhythm guitar, first piano, and backing voice emanate from the left speaker, a second piano, saxophone and backing voice emanate from the right speaker, and a lead voice, bass guitar, lead guitar and drums appear to emanate from a position between the left and right speakers.
  • the lead voice, bass and lead guitars, and drums emanate from each of the left and right speakers with (usually) substantially equal volume with the overall effect that the listener perceives the sound to emanate from a position mid-way between the two speakers.
  • the sounds of the rhythm guitar, first piano and backing voice may emanate predominantly from the left speaker.
  • the music may have been mixed, such that these instruments are reproduced with greater amplitude in a left channel, terminating in the left speaker, than in a right channel, terminating in the right speaker, with the overall effect that sound of these instruments appear to be emanating from the left speaker, in preference to the right speaker.
  • the second piano, saxophone, and backing voice may be similarly weighted to emanate from the right speaker, although these instruments may also play from the left speaker with a reduced volume, with the effect that the sound of the second piano, saxophone and backing voice appears to emanate from a region nearer the right hand speaker than the left hand speaker, ie. somewhere between the centre position and the position of the right hand speaker.
  • Some amount of overlap may occur, in that the proportion of amplitude of these instruments may be weighted towards the left speaker by say 80% to the left speaker, compared to 20% amplitude emanating from the right hand speaker.
  • variable speed music players the speed at which the music is played is reduced to make the music easier for the listener to resolve mentally.
  • a reduction in speed is often of no use in mentally distinguishing the sound of the desired instrument.
  • such devices have the problem that the recording cannot be practised to at the correct tempo.
  • Graphic equalisers are useful in distinguishing instruments which have high frequency sound signals from those which have low frequency sound signals, but as many instruments occupy similar frequency bands, a conventional graphic equaliser cannot readily distinguish between two instruments which occupy overlapping sound frequency bands.
  • Embodiments of the present invention aim to overcome some of the above mentioned problems, and to provide a means of making more accessible particular desired chords and notes in a music passage.
  • Embodiments of the present invention address the problem of providing help for a musician, in accurately transcribing music from recordings, and in reproducing pre ⁇ recorded musical arrangements on the musician's own instrument.
  • an isolator device connectable between an audio signal source output of a stereo sound signal source equipment, and an audio signal input of an audio monitor equipment, characterised in that the device comprises a plurality of electrical connections connected between said audio source output and said audio input in such a way as to isolate signal components present in both a left and a right channel of the audio signal source from signal components present only in one or the other of the left or right channels.
  • the device comprises an aid for transcribing and practising musical arrangements.
  • This may have an advantage of eliminating, or substantially reducing, audio signal components which are common to both channels of a stereophonic recording, for example basslines, bass drum, and vocals, and allowing the audio signal components relating to other musical instruments, which are routed predominantly to a left or right channel, to be enhanced relative to the audio signals which are common to both channels.
  • the overall effect to the listener may be that certain instruments are isolated from the general mix of instruments in a polyphonic sound recording, which aids practice of an instrument to those sounds, or enables transcribing of those sounds to be more easily made.
  • the audio monitor may be a set of stereo headphones, or a separate hi fi amplifier and one or more speakers.
  • the audio monitor may be stereo or mono.
  • the isolator may provide as one of its functions, a simple and inexpensive way of eliminating bass, drums, and vocals from recorded music, thus allowing access to notes and chords which could otherwise be inaudible or indistinguishable by the human ear.
  • the isolator device may have a variable resistor for connecting the left and right channels of an audio source signal.
  • the isolator device may have an audio signal mixer for mixing a signal derived from a stereo audio source signal with an audio signal from a musical instrument.
  • the isolator is adapted to receive a stereo audio source signal having a signal component L relating to a left channel, a signal component R relating to a right channel, and a signal component C relating to both the left and right channels, characterised in that the device is capable of producing an output signal having components L+R, and/or C, and/or L+R-C, and/or L+C and/or R-f C.
  • two or more of the signal components L+R, C, L+R - C, L+C or R+C may be selectively combined with each other.
  • the isolator may comprise a set of passive components.
  • the invention includes a sound isolator for aiding in the transcription of a sound recording and/or for aiding in the practice of a musical instrument, the apparatus comprising:
  • first and second input signal channels for receiving an audio signal of two or more channels from an audio apparatus
  • the isolator may have first and second input terminals and first and second output terminals each having a channel conductor and a common conductor, characterised in that the channel conductor of the first input terminal is connected to the channel connector of the first and second output terminals, and the channel conductor of the second input terminal is connected to the common conductors of the first and second output terminals.
  • the isolator may have first and second input terminals and first and second output terminals each having a channel conductor and a common conductor, characterised in that the channel conductor of the first and second input terminals are connected to the channel conductor of the first output terminal, and the common conductor of the conductors of the first and second input terminals are connected to the channel conductor of the second output terminal.
  • the isolator may have the channel conductor of the first input terminal connected to the channel conductor of the first output terminal, the channel conductor of the second input terminal connected to the channel conductor of the second output terminal, and the common conductor of the first and second input terminals connected to the common terminals of the first and second output conductors,
  • connection between the common conductors of the first and second input terminals and the common conductors of the first and second output terminals is via a variable resistance element.
  • the isolator may comprise a passive unit for inserting between the audio output of a conventional stereo signal source, eg a hi fi amplifier, and a conventional pair of stereo headphones. This may have an advantage of requiring no separate power supply or batteries for use of the isolator.
  • a conventional stereo signal source eg a hi fi amplifier
  • the isolator may be provided with active components for improving the amplification and isolation of the signals, in which case, the isolator may be provided with a dedicated power supply, eg batteries.
  • a dedicated power supply eg batteries.
  • the isolator device may enable isolation of particular musical instruments within a musical arrangement recorded on a stereo music recording, and enable copying, imitation or transcription of the instrument with greater precision. Furthermore, the isolator device will accept stereo music signals, for recordings played at any speed in the audio range, and therefore may aid in the transcription of fast tempo musical recordings.
  • the isolator device may be is portable and battery powered.
  • the isolator device may comprise a set of frequency filters to selectively filter audio frequencies in the range 20 Hz to 40 KHz.
  • the isolator device may be capable of filtering off audio input signals which are common to a left and a right audio channel, and filtering out from said filtered components, a signal relating to a bass instrument.
  • the invention includes a sound isolator device for separating out, or partially separating out, voices on a stereo recording which appear equally, or nearly so, on both a left and a right channel, so as to appear as a central voice, from voices which appear solely, or nearly so, on either the left or the right channel.
  • a signal output of the device may comprise signals relating to voices which appear in substantially equal proportion in both left and right audio input channels, and signals relating to voices which appear predominantly on the left audio input channel.
  • the signal output of the device may comprise signals relating to voices which appear in substantially equal proportion in both left and right audio input channels, and signals which appear predominantly on the right audio input channels.
  • the invention includes a method of isolating signal components of an audio source signal containing components common to both a left and a right audio channel, for the purpose of comprising cancelling a left component of the audio signal with a right component of the audio signal by sbtraction of the left and right signals, or vice versa.
  • Figure 2 shows a first specific method and apparatus according to the present invention, for connecting a pair of conventional stereophomc headphones to the output of a conventional stereo sound reproducing equipment in order to obtain a first isolation effect.
  • Figure 3 shows a second specific method and apparatus according to the present invention, for connecting a pair of conventional stereo headphones to a conventional stereophonic reproducing apparatus in order to obtain an isolation effect.
  • Figure 4 shows a sound field of a conventional stereo recording, played through conventional stereo sound reproducing equipment, as perceived by a listener;
  • Figure 5 shows a sound field produced by the same stereo recording, after passage of the corresponding audio source signal corresponding to the sound recording, through a sound isolator device according to the first specific embodiment of the present invention.
  • Figure 6 shows a second sound field produced from the stereo recording after passage of the audio signal through a sound isolator device according to another specific embodiment of the present invention;
  • Figure 7 shows a third sound isolator device, according to a third specific embodiment of the present invention.
  • FIGS 8 and 9 show two sound isolator circuits according to respective fourth and fifth specific embodiments of the present invention.
  • Figure 10 shows a general view of a stand alone isolator unit according to a sixth specific embodiment of the present invention.
  • Figure 11 shows a specific circuit which may be used in the isolator of Figure 10.
  • Figure 12 shows a second specific. circuit which may be used in the isolator of Figure 10.
  • the first isolator circuit can be connected between a conventional audio source output of a stereo Hi fi amplifier, and the input to a conventional set of stereo headphones, or other monitor apparatus.
  • the first isolator circuit comprises an audio input terminal, eg. a jack plug, having first and second conductors 101 , 102 for left and right input signal channels respectively, and a common conductor 103; an audio output terminal, eg. a phono jack plug, having first and second output conductors 104, 105 and a common conductor 100, for connection to the input of the headphones.
  • an audio input terminal eg. a jack plug
  • an audio output terminal eg. a phono jack plug
  • a first connection 3 connects the left channel of the stereo audio source output to the left and right channels 4,5 respectively of the monitor.
  • a second conductor 6 connects the right channel of the stereo audio source output to a common terminal 100 for connection to a common terminal of the headphones.
  • the common conductor of the audio source output is left to float.
  • a stereo recording can be split into two distinctive sound parts that can be produced independently as effects A and B, such that the output of the circuit of Figure 2 can be used to isolate instruments in the sound field which are biased towards either left or right channels.
  • the second isolator comprises a conductor 9 connecting the left channel of the audio source output to the left channel of the audio monitor input.
  • a conductor 10 connects the right audio source output channel to the right audio monitor input channel, and a further conductor 11 connects the common audio source output terminal 151 to the common audio monitor input terminal 152.
  • the conductor 11 is provided with a variable series resistance 12, in the form of a potentiometer, so that the connection between the respective common terminals can be varied from between near zero resistance to a high resistance (k ⁇ -M ⁇ ).
  • k ⁇ -M ⁇ high resistance
  • the sound on the two channels can be said to be divided into three parts. These are: Left, Centre, and Right. Most parts of the sound that appear to be in the centre of the stereo sound field may be equally balanced on the left and right channels, whilst those parts of the sound that appear only on the left or right side of the sound field are not equally balanced.
  • a lead vocal signal may be equally balanced between the left and right channels of a conventional audio output terminal.
  • snare drum instrument and bass drum Specific instruments eg. a first guitar or piano, a backing vocal or a high torn may be biased predominantly to the left channel of the stereophonic output.
  • a second guitar, piano or keyboard, a second backing vocal, and a low torn may be predominantly biased to the right hand channel of the stereophonic output.
  • certain instruments appear to come from a centre position between the left and right speakers, eg. the lead vocal, bass, snare drum and bass drum, whilst other instruments eg. first guitar, piano or keyboard, first backing vocal, and high torn appear to come from a position near the left speaker.
  • the second guitar, piano or keyboard, second backing vocal, and low torn appear to emanate from a position near the right speaker.
  • the first isolator circuit of Figure 2 has an effect of subtracting from the sound field of a stereophonic recording those parts of the sound which are equal on both left and right channels, and isolating those parts of the sound field which are not equal on both left and right channels.
  • FIG. 6 of the accompanying drawings a sound field produced by a further circuit comprised in a specific embodiment of the present invention is shown, when an audio sound signal would otherwise produce a sound field as in Figure 4, is passed through the filter circuit.
  • the filter circuit comprises a set of conventional high pass, low pass and bandpass filters, to filter an audio signal in the range 20 Hz to 40 KHz.
  • the high pass, low pass or bandpass filters may be selectable independently to filter out a bass component or a voice component of the signal corresponding to the centre soundfield C.
  • Effective Soundfield C-L-R.
  • An isolator may provide a facility to enable basslines and bass drum parts to become more accessible to the ear for transcribing, as shown with reference to Figure 6.
  • the isolator device can use the filter circuit to filter off high frequencies of the audio signal, and allow only the lower frequencies of the audio signal to be heard, thus allowing basslines and bass drum parts to become more readily audibly accessible for transcribing purposes.
  • this facility is also useful in gaining access to the "root" notes and "keys" of musical arrangements.
  • an isolator device which is adapted for interfacing with a wide range of audio sources, for example the amplifier output of a conventional compact disc player, cassette player or a hi-fi amplifier, and/or the output of one or more musical instruments.
  • audio sources for example the amplifier output of a conventional compact disc player, cassette player or a hi-fi amplifier, and/or the output of one or more musical instruments.
  • the third isolator device comprises a casing 200 which houses an input terminal 201 to receive a stereo source input signal via a left channel 202 and a right channel 203, the input terminal also has a common connection 204; an output terminal 205 having a common conductor, a left output channel 206 and a right output channel 207; at least one further input terminal 208 for receiving a signal from a musical instrument, which may be a stereo musical instrument, a circuit 210 for isolating components of the input stereo source signal, and a circuit 218 for mixing in signal components from the one or more musical instruments.
  • a musical instrument which may be a stereo musical instrument
  • a circuit 210 for isolating components of the input stereo source signal
  • a circuit 218 for mixing in signal components from the one or more musical instruments.
  • the circuit 210 comprises a switch 211 for routing the stereo source signal from, for example, a stereo hi-fi amplifier, which is input at the input terminal 201, to first and second isolator circuits 212, 213 respectively.
  • the switch circuit can route the source signal into either one or the other of the isolator circuits, or, where for example the switch comprises a rotary potentiometer, the source signal can be routed in varying proportion to both of the isolators.
  • the audio source signal is fed into the isolator circuit 212, which isolates those parts of the audio source signal which relate only to either one or the other of the left and right audio source channels. Components of the audio source signal which are common to both the left and right audio source channels are cancelled against each other.
  • the resultant signals on conductors 215, 216 respectively are fed into a de-coupler circuit 213, and then into a limiter circuit 214.
  • the de-coupler circuit 213 may comprise a transformer circuit. From the output of the limiter 214, the signals on conductors 215, 216 are fed into a stereo simulator, from which an output is produced in a form suitable for passing to a conventional stereo amplifier input.
  • the isolated signals can be mixed via a stereo mixer circuit 218, with one or more inputs from a musical instrument.
  • the musical instrument(s) can be mixed with the output from the first route, and fed back into the same, or another stereo amplifier, and/or other conventional audio monitor, for listening to the resultant soundfield.
  • the second route comprises an isolator 213, having three output conductors which feed into a de-coupler 222.
  • the output of the de-coupler 222 can be fed to the stereo mixer for mixing with a musical instrument, as described for the first route.
  • the outputs of the first and second routes can be fed by the switch 220 into the stereo mixer, which then mixes the outputs of the two routes together, and/or with one or more musical instruments.
  • the de-coupler circuit 222 may comprise a transformer.
  • the isolator device of Figure 7 can be connected into the tape input/output sockets of a conventional hi-fi amplifier. From the point of the input from the amplifier, the stereo signal is switched to the respective isolator route.
  • the potentiometer switch connected to the first route provides the control for the stereo balance and plays an important part in the isolation process as a whole.
  • the stereo balance is used to provide the isolation peak between the two stereo channels and allows either one of the channels to be heard in isolation on both channels.
  • the de-couplers (or transformers) included in both routes are used to further isolate the ground/negative loop from the circuit loop of the amplifier.
  • the limiter circuit 214 which is provided in the first route only, works to suppress high peaks in the sound during the isolation effect, and to counteract differences in volume between the isolation effect and the effect of the stereo balance.
  • the isolation effect creates a drop in amplitude because it is subtracting elements of sound from the stereo signal.
  • the limiter works by matching the amplitude of the normal signal with that of the isolation effect.
  • the isolator device has two outputs where stereo sound can be simulated effectively by use of the stereo simulator.
  • the stereo simulator is provided in one route only and works by inverting the mono-aural sound back into a stereo image. This enables the sound that was originally different on both channels before isolation, to remain different when isolation takes effect.
  • the second channel does not require a stereo simulator because the sound which was originally the same on both channels and remains the same when isolation takes effect.
  • the stereo simulator creates a much richer, cleaner sound and improves overall quality of the isolation effect.
  • the sound mixer enables musical instruments to blended in with the sound of the music.
  • the mixer is particularly important for transcribing music because it is sometimes necessary to try to reproduce on an instrument the overall effect of the musical arrangement.
  • the mixer is useful for practising along to other musical arrangements and for filling the spaces in the music where the other instruments have become subtracted.
  • FIG 8 of the accompanying drawings an isolator circuit, suitable for use as the first isolator 212 in Figure 7 is shown.
  • the isolator circuit comprises inputs 300, 301, 302 to receive the left channel, right channel, and commoner of the audio source.
  • the right and left inputs 300, 302 are connected together via a potentiometer.
  • a wiper of the potentiometer is connected to the common 301 via a conductor.
  • the resistance between the left channel and the common connector may be varied by varying the potentiometer, and similarly the resistance between the right channel and the common connector may be varied.
  • the left channel may be effectively attenuated by connection with the common channel via the potentiometer 303, or with the wiper of the potentiometer set towards the other end of its scale, the signal in the right channel may be attenuated by connection with the common channel 301 via the potentiometer 303.
  • FIG. 9 of the accompanying drawings another isolator circuit, such as may be used for the second isolator 213 in Figure 7 is shown.
  • the incoming left and right audio source channels are connected together and output at isolator output terminal 401 , whilst the audio source common terminal 402 is routed to the other isolator output 403.
  • the isolator device comprises a casing 20 having a stereo audio in terminal 21 , a stereo audio out terminal 22, having left out, common out, and right out connectors, a potentiometer or switch control 23 for effecting variable connections between the left, right and common channels.
  • the potentiometer or switch enables selection of an isolator output signal which is biased predominantly to left + centre (L+C) to left + right - centre (L+R-C) or to right + centre (R+C).
  • a slide or push button switch 24 to select or de-select bass frequencies from a signal appearing at the isolator output 22.
  • a musician may connect the isolator input terminal 21 to a conventional stereo audio output socket from, for example a compact disc player or a high-fi amplifier, and connect the isolator output terminal 22 via a conventional stereo jack plug to an audio monitor, for example a set of headphones, or, for example, to a separate conventional stereo audio amplifier and loud speakers.
  • a conventional stereo audio output socket from, for example a compact disc player or a high-fi amplifier
  • an audio monitor for example a set of headphones, or, for example, to a separate conventional stereo audio amplifier and loud speakers.
  • the sound field produced by a monitor connected to the isolator stereo output terminal 22 can be adjusted such that the sound field of the output monitor includes instruments which would normally occur on the left and in the centre of the sound field (L+C) so that instruments in the right of the sound field are suppressed, or, by further adjustment of the potentiometer or switch, the sound field can be adjusted such that instruments which appear in the centre of the sound field are suppressed, but instruments which do not occur in the centre of the sound field are selected, ie. (L+R-C), or by further turning of the potentiometer, instruments which appear in the right and centre of the sound field can be selected (R+C).
  • the potentiometer or switch may be smoothly variable between the (L + C) , (L + R-C) , or (R + C) , positions , such that the potentiometer or switch can be adjusted for optimum selection of any particular instrument in which the musician is interested.
  • the potentiometer or switch can be replaced by a switch action selector such that the choices of (L+C), (L+R- C), or (R+C) are distinct.
  • the circuit section comprises a model 741 operational amplifier 30, connected as a voltage subtracter for subtracting an AC audio signal on a first input channel (for example a left audio source channel) 31 from an AC earth 32.
  • a second audio input channel (for example a right audio source channel) 32 is fed directly to a selection potentiometer 33.
  • An audio output socket 22 receives a signal from the output of the potentiometer 33, which can be biased towards the subtracted output signal at the output 34 of the amplifier 30, or by adjustment of the potentiometer, biased more towards the un subtracted right channel 32.
  • selection between a subtracted channel and a, un ⁇ affected, channel 32 can be made and the resultant output made available at the output socket 22.
  • the 741 operational amplifier is connected between a + and - 9 volt DC power supply.
  • the output of the operational amplifier is fed back to the negative input via a 10K ⁇ resistor.
  • the first input signal channel is fed to the negative input of the amplifier via a 10K ⁇ resistor.
  • the positive input terminal of the operation amplifier is biased to 0 volts DC, and de-coupled to -9 volts DC by a 4.7 ⁇ F electrolytic capacitor, to provide an AC earth.
  • the output of the operational amplifier is passed via a 4.7 ⁇ F electrolytic capacitor to one terminal of the potentiometer 33 and in series to the second, un ⁇ affected signal channel 32.
  • the common connections of the input terminals 34, 35 and the output terminal(s) 22 are all connected together.
  • FIG. 12 of the accompanying drawings a further embodiment of an isolator circuit is shown.
  • input audio channels 40, 41 corresponding to left and right channels respectively are fed via a switching circuit 42 comprising switches in both the left and right channels to connect the left and right channels serially to one winding 43 of a transformer 44.
  • a secondary winding 45 of the transformer has one end connected to the common connections of the input sockets 40, 41 and of output terminal(s) 50, and has another end connected to signal channel(s) of the output terminal(s) 50.
  • the switch connections in the input channels L and R, 40, 41 respectively, are shown as 1, 2, 3 and 4, 5 and may be switched as follows, to provide the following sound field selections.
  • the switches may be connected as follows.
  • R + C 4 + 2 - 1, 3 + 5
  • L signals relating to sounds which appear in the left of the output sound field
  • C signals relating to sounds which appear in the centre of the sound field
  • R signals relating to sounds which appear in the right of the sound field.
  • the musician is the potential recipient of the music of a music isolator according to the above mentioned specific embodiments of the present invention, but in a broader sense, anyone who plays or is learning to play a musical instrument ie. amateur music enthusiasts, novice musicians, music groups, amateur club bands, music writers, or buskers, could use these specific embodiments.
  • Embodiments of the invention may help the musician or amateur music enthusiasts to accurately transcribe and reproduce recorded music on a musical instrument.
  • the embodiments may take a stereo music recording and effectively isolate the musical instruments within the musical arrangements, enabling the music to be copied, imitated or transcribed with greater accuracy and precision.
  • the isolator embodiments work in effect by turning the sound of the music inside out, allowing those instruments that are buried inside the music to come out of the music mix. Thus, the instruments can become isolated from the rest of the musical arrangements and become more accessible to the ear for transcribing.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)

Abstract

L'invention concerne un dispositif destiné à aider les musiciens à transcrire la musique ou à jouer de leurs instruments en s'accompagnant d'un enregistrement stéréophonique. Un séparateur (200) peut se connecter entre une sortie source de signal audio (201) d'un équipement délivrant un signal sonore stéréophonique et une entrée de signal audio (206) d'un équipement audio stéréophonique ou monophonique. Ce séparateur comprend plusieurs connexions électriques (212, 213) destinées à relier la sortie audio et l'entrée audio de façon à séparer les composantes de signal présentes à la fois sur les voies gauche et droite de la source du signal audio des composantes de signal présentes seulement sur l'une ou l'autre de ces voies gauche ou droite. Ce séparateur musical exige pour fonctionner une entrée de signal stéréophonique, mais il est doté d'une sortie monophonique. Un tel équipement audio monophonique permet d'obtenir un effet de séparation musicale.
PCT/GB1993/001785 1992-08-22 1993-08-20 Separateur musical WO1994005135A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47295/93A AU4729593A (en) 1992-08-22 1993-08-20 Music isolator

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GB9217899.5 1992-08-22
GB929217899A GB9217899D0 (en) 1992-08-22 1992-08-22 Music isolator

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WO1994005135A1 true WO1994005135A1 (fr) 1994-03-03

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GB (1) GB9217899D0 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2391781A (en) * 2002-08-02 2004-02-11 Granville Jones A device for removing the vocal component of an audio recording

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US4815133A (en) * 1986-02-20 1989-03-21 Mitsubishi Denki Kabushiki Kaisha Sound field producing apparatus
US4953212A (en) * 1988-11-29 1990-08-28 Pioneer Electronic Corporation Auto voice changing apparatus
EP0481821A2 (fr) * 1990-10-19 1992-04-22 Leader Electronics Corp. Appareil et méthode pour la détermination de la corrélation de phase d'un signal stéréophonique
US5140637A (en) * 1989-12-01 1992-08-18 Arnold Kaplan Device and method for removing vocal signals
EP0517233A1 (fr) * 1991-06-06 1992-12-09 Matsushita Electric Industrial Co., Ltd. Appareil de discrimination musique voix

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DE3118704A1 (de) * 1981-05-12 1982-12-02 Bruens, Dieter, 5030 Hürth Playback synthesizer
US4815133A (en) * 1986-02-20 1989-03-21 Mitsubishi Denki Kabushiki Kaisha Sound field producing apparatus
US4953212A (en) * 1988-11-29 1990-08-28 Pioneer Electronic Corporation Auto voice changing apparatus
US5140637A (en) * 1989-12-01 1992-08-18 Arnold Kaplan Device and method for removing vocal signals
EP0481821A2 (fr) * 1990-10-19 1992-04-22 Leader Electronics Corp. Appareil et méthode pour la détermination de la corrélation de phase d'un signal stéréophonique
EP0517233A1 (fr) * 1991-06-06 1992-12-09 Matsushita Electric Industrial Co., Ltd. Appareil de discrimination musique voix

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2391781A (en) * 2002-08-02 2004-02-11 Granville Jones A device for removing the vocal component of an audio recording

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AU4729593A (en) 1994-03-15
GB9217899D0 (en) 1992-10-07

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