SE123727C1

SE123727C1 -

Info

Publication number: SE123727C1
Authority: SE
Publication date: 1948-01-01

Description

Uppfinnare: K. de Boer. Inventor: K. de Boer.

Prtioritet begard frdn, den 6 juni 1944 (Arederlanderna). Prtioritet begard frdn, June 6, 1944 (Arederlanderna).

Liksom vid en ljuduppteckning i ett enkelt spar upptrader vid stereofoniska ljuduppteckningar of La behovet av en eller flera skilda ljuduppteckningar, I. ex. for volymreglering, stereofoniska verkningar och dylikt. Da emellertid redan tva uppteckningar for ljudet finnas, är det vanligen med hansyn till det till forfogande staende rummet mycket svart att for denna uppteclming anordna aven ett tredje spar. As with a sound recording in a single track, the need for one or more different sound recordings occurs in stereophonic sound recordings of La, I. ex. for volume control, stereophonic effects and the like. However, as there are already two records for the sound, it is usually very difficult with regard to the available space to arrange a third track for this record as well.

Det är darfor aven kant .att i ett av ljudsparen anbringa en sadan hjalpsvangning, vars frekvens ligger utanfor det horbara omradet. Delta forfaringssatt liar emellertid den nackdelen, att nar hjalpsvangningens frekvens ligger under del horbara omradet, denna är svar att skilja him ljudfrekvenserna och att nar den ligger Over detta omrade, t. ex. uppgiir till 20000 p/s, uppteckningen blir svar, emedan de vanliga uppteckningsorganen icke lampa sig via darfor. It is therefore also advisable to apply such an auxiliary oscillation in one of the sound pairs, the frequency of which is outside the audible range. Delta procedures, however, have the disadvantage that when the frequency of the auxiliary oscillation is below the audible range, this is the answer to differentiate the sound frequencies and that when it is above this range, e.g. states at 20,000 p / s, the record becomes the answer, because the usual recording means do not light up via it.

Vidare är det kant vid grammofonplattor att .anbringa den ena kanalens alla ljudsvangningar i det ena sparet och endast anbringa de hoga tonerna, t. ex. over 300 p/s, Mr den andra kanalen i det andra sparet, for att fa ett smalare spar och pa detta satt kunna anbringa flera spar bredvid varandra pa en vanlig grammofonplatta. Furthermore, it is the edge of gramophone records to apply all the sound oscillations of one channel in one track and apply only the high notes, e.g. over 300 p / s, Mr the second channel in the second track, to get a narrower track and in this way be able to place several tracks next to each other on a regular gramophone record.

Fastan det är kant att de laga tonerna i allmanhet icke bidraga till den stereofoniska verkan, och darfor vid atergivningen redan sedan lange endast anvdndes en enda tatergivningsanordning for de djupa tonerna, har det .emellertid i praktiken visat sig, att nar ljudsvangningarna, som tillforas till denna Atergivningsanordning for de laga tonerna, komma frail endast den ena .av kanalerna, vissa fall upptrader en forsamring av det atergivna ljudets klangfarg. Om t. ex. en ljudk.alla, som .alstrar manga djupa toner, befinner sig nara en av mikrofonerna och om denna mikrofon tillhOr den kanal, fran vilken de lap tonerna just bortfalla, atergivas dessa Riga frekvenser endast frail den andra mikrofonen och atergivas alltsa relativt alltfOr svagt. Although it is true that the low tones generally do not contribute to the stereophonic effect, and therefore only a single tattering device for the deep tones has long been used in reproduction, it has been found in practice, however, that when the sound oscillations applied to this reproduction device for the low tones, come frail only one of the channels, in some cases there is an amalgamation of the timbre of the reproduced sound. If e.g. a sound.all, which produces many deep tones, is near one of the microphones and if this microphone belongs to the channel from which the lap tones just disappear, these Riga frequencies are reproduced only from the other microphone and are reproduced relatively too faintly.

Till grund for foreliggande uppfinning Jigger den insikten, att utelamnandet av de laga tonerna Iran den ena av kanalerna i allmanhet icke är Onskvart, sa. att t. ex. utovandet av det for uppteckning pa en grammofonplatta kanda, ovan namnda sattet, vid vilket detta utelamnande sker f8r att frigora omradet 0-300 p/s, skulle forsamra atergivningen. The basis for the present invention is the realization that the omission of the legal tones Iran one of the channels in general is not Onskvart, said. that e.g. the practice of recording it on a gramophone record, in the manner mentioned above, in which this omission occurs in order to free up the range 0-300 p / s, would delay the reproduction.

Pa basis av denna insikt syftar uppfinningen till att angiva ett salt for uppteckning av stereofoniska ljudsvangningar, vid vilket alit av mikrofonerna upptaget ljud och alltsa icke en del darav Mores i bra spar och i ett av dessa spar dessutom upptecknas en eller flera hjalpsNangningar, som hava en frekvens, som icke ligger utanfor utan mom det h8rbara omradet. On the basis of this insight, the invention aims to provide a salt for recording stereophonic sound oscillations, in which all the sounds recorded by the microphones and thus not some of them Mores in good tracks and in one of these tracks also one or more auxiliary melodies are recorded, which have a frequency which is not outside but within the audible range.

Enligt uppfinningen ar detta mojligt darigenom, att de hoga tonerna i den ena kanalen upptecknas i det ena sparet och de hoga tonerna i den andra kanalen upptecknas gemensamt med de laga tonerna fran hada kanalerna i det andra sparet, och att i det spar, i vilket endast de hoga lonerna forekomma, samtidigt aro upptecknade en eller fiera hjalpuppteckningar, vilkas frekvenser ligga inom det horbara omradet men under gransfrekvensen mellan de hoga och de laga tonerna, alltsa i praktiken vid en frekvens mellan 250 och 600 p/s. According to the invention, this is possible in that the high tones in one channel are recorded in one track and the high tones in the other channel are recorded together with the low tones from the had channels in the other track, and that in the track in which only the high tones occur, at the same time there are one or more auxiliary records recorded, the frequencies of which are within the audible range but below the spruce frequency between the high and low tones, ie in practice at a frequency between 250 and 600 p / s.

Fordelen med siittet ,enligt uppfinningen är den, att de av hada mikrofonerna uppfanpde lap tonerna alltid ocksa atergivas och alltsi alltid hava den onskade fullheten. The advantage of the seat, according to the invention, is that the laptops recorded by the microphones are always also reproduced and thus always have the desired fullness.

Uppfinningen omfattar aven en anordning, medelst vilken det ovan namnda sattet kart utforas, vid vilken anordning ljudsvangningarna overforas stereofoniskt medelst tvenne 2— — kanaler till en anordning for uppteckning i tva spar. Anordningen enligt uppfinningen innehaller frekvensberoende element for skil- jande av de hoga och de laga tonerna i en .av kanalerna och organ for overforande -av de lap tonerna i denna kanal till den andra kanalens uppteckningsanordning samt vidare organ for overforing av en -eller flera hjalpsvangningar till den forstnamnda kanalens uppteckningsanordning. The invention also comprises a device, by means of which the above-mentioned set of maps is made, in which device the sound oscillations are transmitted stereophonically by means of two 2-channels to a device for recording in two tracks. The device according to the invention comprises frequency-dependent elements for separating the high and low tones in one of the channels and means for transmitting the laptops in this channel to the recording device of the other channel as well as further means for transmitting one or more auxiliary oscillations. to the recording device of the first-mentioned channel.

FOr detta andamal anvandes foretradesvis en anordning vid vilken de av mikrofonerna stereofoniskt upptagna svangningarna i mot- hs foras till ingangskretsen hos en mottaktforstarkare, vars utgangskrets innehaller tre transformatorer, vilkas primarlindningar aro kopplade i serie och som aro sa konstruerac13, att av en av desamma genomslappas hada kanalernas laga toner och av de bada andra transformatorerna endast de hoga tonerna fran var sin av kanalerna, varvid de hoga to- nerna Iran en av de sistnamnda transformatorernas sekundarkrets foras med de i mottakt forstarkta laga tonerna Iran den forstnaranda transformatorn gemensamt till den ena uppteckningsanordningen, medan de ga tonerna fran den andra transformatorns sekundarkrets Rims tillsammans med en eller flera hjalpsvangningar till den andra uppteckningsanordningen. For this purpose, a device is preferably used in which the oscillations recorded by the microphones in the opposite direction are fed to the input circuit of a receiver amplifier, the output circuit of which contains three transformers, the primary windings of which are connected in series and which are designed to be connected by one of the same. had the low tones of the channels and of the two other transformers only the high tones from each of the channels, the high tones Iran one of the secondary circuits of the latter transformers being lined with the strong tones Iran received the first transformer in common to one recording device , while giving the tones from the secondary transformer secondary circuit Rims together with one or more auxiliary oscillations to the second recording device.

Uppfinningen forklaras narmare nedan i form av ett exempel och under hfinvisning till bifogade ritning. Fig. 1 visar schematiskt en anordning enligt uppfinningen, av vilken uppfinningens princip framgar. Fig. 2 visar en anordning enligt uppfinningen med an- vandning av den namnda mottaktforstarkaren. The invention is explained in more detail below in the form of an example and with reference to the accompanying drawing. Fig. 1 schematically shows a device according to the invention, from which the principle of the invention appears. Fig. 2 shows a device according to the invention using the said receiving amplifier.

I fig. 1 beteckna M, och Mimikrofoner, som aro anordnade ph ett visst avstand fran var- andra, sasom ar vanligt for stereofonisk ljud- uppteckning. De upplagna svangningarna tillfOras kanalerna 1 rasp. 2 och forstarkas av de bada forstarkarna V, resp. V,. De Iran for- starkaren V, kommande svangningarna uppdelas sedan i tva grenar, av vilka den ena over- fares Over ett filter F1, som ar genomslap- pande endast for svangningarna Over gransfrekvensen, t. ex. 600 p/s, och den andra overfo- res Over filtret F, far de laga tonerna till den forsta kanalen 1. De sit erhallna totala svangningarna tillforas nu Over fiirstarkarna V, resp. V4 vidare till uppteckningsanordningarn.a S, och S2, som -vardera anbringa ett sarskin spar pa en barare. De fran filtret kommande svangningarna hava alltsa alla frekvenser Over gransfrekvensen, sa att oat- radet under denna gransfrekvens Ar fritt for anbringande av en eller flera hjalpsvangningar, som t. ex. kunna inblandas Over kanalen 3. In Fig. 1, M denotes Mimicrophones, which are arranged at a certain distance from each other, as is usual for stereophonic sound recording. The laid oscillations are supplied to the channels 1 rasp. 2 and is amplified by the two amplifiers V, resp. V ,. The Iranian amplifier V, the upcoming oscillations are then divided into two branches, one of which is transmitted over a filter F1, which is continuous only for the oscillations Over the spruce frequency, e.g. 600 p / s, and the second is transmitted over the filter F, the low tones are transferred to the first channel 1. The resulting total oscillations are now applied to the over-strong V, resp. V4 on to the recording devices na S, and S2, each of which applies a separate slot to a carrier. The oscillations coming from the filter thus have all frequencies above the spruce frequency, so that the row below this spruce frequency is free from the application of one or more auxiliary oscillations, such as e.g. be involved Over channel 3.

I fig. 2 tillfOras de frau forstarkarna V, och V2 kommande svangningarna till gallren i -Iva rot. B, resp. B2 i mottaktfOrstarkaren. Da svangningarna darvid maste vara i motfas till varandra, aro den ena kanalens ledningar pol- vanda vid K.,. I rorens B, och B, anodkrets aro transformatorerna T,, T2 och T1 inkopplade. T. och T2 aro set utbildade (primarlindningen har t. ex. lag sjalvinduktion), att de endast genomslappa de hoga tonerna i kanalerna 1 och 2. Primarlindningen och eventuellt sekundarlindningen pA transformatorn T, dr shuntad av en kapaeitet, sA att ,denna forstarkt leder vidare i mottakt endast de laga tonerna i de bada kanalerna. De frau derma transformator kommande svangningarna tillfogas i kanalen 1 till de hoga tonerna i denna kanal och tillforas gemensamt med dessa till uppteckningsanordningen Si. For utjamning av polvandningen vid K, ar derma kanal Ater polvand vid K. I kanalen 2 tillfores Ater Over kanalen 3 en eller flera hjalpsvangningar, vilkas frekvens ligger under gransfrekvensen (mellan 250 och 600 p/s), och Was vi-dare till uppteckningsanordningen S2. In FIG. B, resp. B2 in the reception amplifier. Since the oscillations must be in opposite phase to each other, the lines of one channel are polar at K.,. In the rudder B, and B, the anode circuit, the transformers T1, T2 and T1 are connected. T. and T2 are set (the primary winding has, for example, low self-induction), that they only pass through the high tones in channels 1 and 2. The primary winding and possibly the secondary winding on the transformer T, dr shunted by a capacitance, so that, this amplifies leads in reception only the low notes in the two channels. The oscillations coming from the secondary transformer are added in the channel 1 to the high tones in this channel and are supplied together with these to the recording device Si. To equalize the pole irrigation at K, this channel Ater pole water at K. In channel 2, one or more auxiliary oscillations are supplied over channel 3, the frequency of which is below the spruce frequency (between 250 and 600 p / s), and Was further to the recording device S2.

Claims

Patent claim:

1. Set for recording stereophonic sound oscillations in two channels, characterized in that the recording is made in two tracks, the high tones of one channel being recorded in one track and the high tones of the other channel together with the low tones of the two channels being recorded in the other track , and that in the only high-pitched tones containing the spar, one or more auxiliary oscillations are also recorded, the frequencies of which lie within the audible range, but below the spruce frequency between high and low tones.

Device for performing the set according to patent claim 1, in which device the sound oscillations are transmitted stereophonically by means of two channels to a device for recording in two tracks, characterized in that frequency-dependent elements (Fh, F, or T23 T, respectively) are arranged for separation e of the high and low tones in one (2) of the channels oth that means are provided for transmitting the low tones of this channel to the recording device (Si) of the other channel (1) and further means (3) for transmitting a or several auxiliary swings to the recording device (S2) of the first-mentioned male (2).

3. A device according to claim 2, characterized in that it comprises a receiver amplifier (V), to the input circuit of which the oscillations recorded by the microphones (M „M2) are carried phased phased and whose output circuit contains three transformers (Ti, T„ T „), whose primary windings are connected in series and which are so constructed that one (T,) of them permeates the legal tones of the channels and of the other two. the transformers (T, or T2) only the high tones from each of the channels (1 and 2, respectively), the high tones from one (TO of the secondary circuit of the latter transformers being interleaved with the received amplified low tones from the first-mentioned transformer ('L) common to one detecting device (Si), while the high tones from the secondary circuit of the second transformer (1.) race together with one or more auxiliary windings to the second detecting device (S2).

4. Carrier with a stereophonic sound recording, presented on. the method specified in patent claim 1. Stockholm 1948. Sung '. Boktr. P. A. Norstedt & Saner 480089