DE1762291A1 - Transmission system for the transmission of additional information in a sound channel of a normal television system - Google Patents

Description

PHI 2469 Jf / TW Dr. Herbert

r: N.v.PHiLiPS * eL0 £ JUM /> £ NFA8RiEKEN u.Haderlandee Teleriei · Stichtin * Akf ·, PHH- 2469 ^ *

Registration on 17 May 1968

"Transfer message" for the transfer of additional information in "ines Sound channel a ·· normal television system · "·

The invention also relates to a transmission system for the transmission of additional information in a · «audio channel a · normal television systems with a bandwidth of about 0 bia about the repetition frequency.

Using normal television system · «in · diffusion to enable additional information (see below) is often aimed at. ώ · can be calibrated for water level reports, that is · relevant for boaters or act police announcements for police stations and the like. These Information is not allowed to be obtained with normal reception equipment be recognizable and may even have to remain inaudible. This· Information may not be recognizable as such with normal vaccination equipment and may even have to remain inaudible. These Additional information is also referred to as hidden information designated.

To reconcile this hidden information with the above To be able to transfer changes, the transfer according to the invention

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system indicates that the additional information is provided by means of lower -single sideband modulation bit help · a carrier with a frequency Γ on the dog the normal available tone ranges of the mentioned ion channel are transmitted, the frequency position of the additional "! transmitted information in the opposite direction to the normal in this audio channel is transmitted information.

One significant application of this hidden information is to measure listeners or viewing density in a particular country. So far made such Measungen ent '' of 4 by the transfer of an additional high-frequency · ignels zus-.nr s with the normal W paint Uochfrequenzsignal or through the transmission of digital with very low frequencies in the sound channel *

The first method has the disadvantage that the the ever decreasing distance «wipe almost no difference between the frequencies tiaum remains in the ether to transmit an additional high-frequency signal, since this will always interfere with the reception of a feasible transmitter.

The second method has the disadvantage that it is low Frequencies are normally audible and, so that they do not have a disruptive effect, turned back to such a low level «that the fc security that every registration device that is used with a number of radio or television sets to register the listener or television density is arranged, aneprioht, is no longer given. The * abandonment the fcesaung is thereby greatly reduced aleo

Duroh application of the principle · of the invention, according to which the Auxiliary support is at the hands of the Twn Canal and they are very low Frequencies, for example not higher than 100 to 200 oz, are modulated, the liaum available for normal information transmission such as iprache and music will hardly be reduced in the normal i'on channel and it is also guaranteed that ·· the sent hidden information for the above-mentioned purposes for the user de · entering -mpfttnßore no longer audible «ind. kaa kan »the strength of those who hid

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ftflftsi

So increase information enough so that under all limits / »It is guaranteed that the registration devices arranged at the recipient's premises speak out when the hidden information is revealed.

If the principle of the invention ends in a television transmission system and if you choose the wave frequency f The hidden information is always provided with an oignal bit of the line frequency. This means that the expensive crystal kit frequency dividers can easily be omitted. This advantage applies both to the transmission of hidden information in the form of speech (waiser- % 3 tiindtneldunffen, Tolizi announcements, etc.) as well as to the measurement signals when measuring the viewing density.

Some possible executions · fora of systems and associated ones End and reception systems after the air has been found are in the drawings and are described in more detail below, is demonstrate

Pig. 1 the frequency spectrum of the audio channel with the specified position of normal information and hidden information, g

FIG. 2 shows the spectrum according to FIG. 1, a normal sound carrier modulated with the frequency f,

3 the οpectrum of a sound channel, like the «normally may be present, in which the normal «sound information and the hidden nit-switched information for measuring audience and television density is specified in a certain country,

4 shows the block diagram of a possible implementation a »; r system for the transmission-side spontaneous generation of the hidden information,

3 shows the block diagram of a plant opposite

according to fitf · 4 slightly modified device for generating the auxiliary carrier ·,

Fig. 6 is a block diagram of a television receiver with one thereon

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connected adapter regulator device for lieeeung the Ferneehdiohte in a * certain country

7 shows the block image of a part of an adapter registration device, which compared to the device shown in Fig. 6 approximately is changed

In FIG. 1, the output voltage V is shown as a function of the frequency. 4 nooh nSher explains »originate from a sound amplifier in a audio system or from a receiver. The audio signal Jk is intended to be broadcast by a transmitter with an audio channel that can normally process frequencies from 0 to f, or to be recorded on a magnetic tape, the highest frequency of which is to be recorded, to be grounded. This means that this source channel has a normal bandwidth B. This normal tone range is shown in FIG. 1 by the dashed line 1. According to the irinsip of the invention, this audio channel can now be used for special applications without the normal function of this Xon channel being impaired by the application in question. One can think of, for example, the transmission of additional information, such as the above-mentioned »/ Resistance reports or the transmission of police announcements to duzu. Suitable times · This can be done, for example, when the normal radio system is used to broadcast speech, so that fewer demands are made on the bandwidth than when music is sent out. In this case, the xonkunal is divided into two parts, one part with the bandwidth Bj with a frequency f, which is then implemented on the transmission side by switching on a special filter, and a second part that is used for transferring additional information, which is in the form of a lower Dineuitonbunusignal · with a width B »an auxiliary · carrier with the frequency f were modulated * The IrCt ^ rf

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Placed as close as possible to the limit frequency f dec of the normal channel, so that the bit of bandwidth B _{1 is} sufficient for the information transmitted in the normal way chew «remains. In Fig. The spectrum of normal information was indicated by the drawn line and that of the hidden or lusical information by the drawn line 5.

Ia above are as examples of additional

In / ormationen the transmission of water level reports or oil announcements have been mentioned. However, there are many other possibilities. If, for example, the spectrum according to FIG. 1 represents the sound channel _{Λ of} a television system *), the normal information indicated by line 2 can mean the commentary on a television picture, such as a football game, for example. However, one would then like to add a comment in a different opraohe than that of the country in which the football game is played to this football game, as is customary in the Eurovision network. This comment can be given as hidden information in the ap ^ ktrum indicated by line 5. In the country where the football game is played, this comment is not audible because it cannot be detected by the normal detectors of the recipients in this country. When transmitted via the iüuro visions net ζ, it can then be detected in the studio of the country in which the television picture is received using a suitable adapter and then sent as a normal x'on signal ia the television signal to be broadcast in the receiving country . This means that no additional audio lines are necessary to send the Kooaentar. 15 kHz is transmitted. These cables are specially designed because tones up to 9-10 kHz are still undistorted for good music playback

■! •• s can be transmitted. Jine range from 0 to above 10 kfis

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so you could send an inot signal with a frequency of 1 f

2 ^r and this inotsignal in a receiving-side doubling circuit in its r'resequence vcrdopjjdn. Additional equipment is then required on both the sending and receiving sides, which is destroyed by choosing the rapid repetition frequency for f.

Line another option is this ;: an an operation TV picture showing in a hospital, which besides one ΚοηΡΊβηΐ.ηΓ for the layperson with a comment for doctors will. This too-

FHM 2469

is therefore not sufficient, because the frequencies are around J-10 kHz can already be muffled in significant cash registers. This can be twar correct with correction filters, but these result in considerable

Delays for the high frequencies, waa again to distortion

of the tone · leads · With a bandwidth bia oa. 15 kHz does all of this no longer disturbing. In this case oleo g ■ 15 kHz.

Jieee so-called 15 kHz cables are quite suitable for this Transmission of duplicate information according to the invention i'prinzip. Aprach frequencies of 0-7 kHz are more than sufficient for Gfwthrleisaing good audibility. From the hidden information Then the woofers drop out again (see the frequency characteristic for the entire audio channel, like the ·· by the dashed line 1 in ^ Flg. 1 is indicated opposite the fully balanced line J, the latter oak indicates the area of hidden information; but this also works not very annoying.

If, as will be described in more detail below, the "rush repetition" frequency f ^ is chosen for the aid carrier frequency f, this also offers the advantage that no additional assumptions need to be made for this aid carrier per se. Because from line 1 it can be seen that the Hilfstraseramjilit.de itself is cut down to almost KuIl. In the received signal is the Ä

Auxiliary carriers themselves no longer exist. For good demodulation • If this auxiliary carrier should be available (e.g. oynchrondeiaodulatibn).

But because the image signal is received at the same time Contains general synchronizing pulses, I read from them a signal with the Derive ilen repetition frequency f ^. The latter oil signal lets you see then at the same time feed a synchronous demodulator, which also does the signal with the hidden information received, "a" output of this jynchronous denodulator then the hidden information appears in derodulated

If one would not choose the line repetition frequency,

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• atilioho comment can again al · verateokte information in the duroh because spectrum 3 indicated area is sent with

FIG. 2 shows the spectrum according to FIG. 1, Jedooh a sound carrier f *. modulated. It is assumed that the modulation takes place as normal sideband modulation »ao that the blocked information given by the drawn lines 4 is for the left and right of the normal information given by the drawn line 5 · Lan can ever doah auoh erforderlloherfalla daeeelbe system door single-sideband apply, in which case signal beiepieleweiae.das 5 · al partly · Einoeiten stability is auagesandt bondaignal. This then means that · the lower frequencies. of the signal 5 as a low sideband signal, the high frequencies are broadcast as a low band signal

In the introduction it was already said that ·· the carrier f in the lower single sideband signal uaAefdrflokt · Sas said »vie said, the advantage that the signal is under no condition through an apit detector of the normal striker can be detected «so that tata & ohlich this rereteoct information with the normal iäapfangeltteln'n’t is audible. Aueserdom can also modulate the normal spectrum · 2 and that of the hidden information 3 with ..odulation on the * γ8ι; θγ f.

^w are carried out according to the sequence modulation principle · The spectrum of the hidden information 3 itself is amplitude modulated on the auxiliary carrier f. 1, whose ülunal 3 is then Jedooh aooh amplitude modulated, and thus first, before it is audible, it has to be detected in a üynohrondetektor «

υΐηϋ Applicability of hidden information in sum the.! 5ror- and Ferneehdichto is in the Spoktruu nuch Fif. 3 shown. in the The left part of the figure 3 has a spectrum that is again dependent on the Frequency Mull bio sur i'ruquu /: z f runs & uft. uaui recognizes from this, dano the

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Bandwidth B- of the normal information 2 riel greater let al · that of the τ · * · stuck information 3. The bandwidth B- of the information 3 is, for example, no more than 100 to 200 Hs and under the assumption that ·· f_ - 4 »5 kHs and the frequency f _r1 - 4 _{t is} 4 kHs, f _yl - the bandwidth By will be at most a frequency of 4.2 kHz su. However, a bandwidth of 4.2 kHz is sufficient for most punk systems to be able to emit a good sound, so that if a low-pass filter with a cut-off frequency of f _ft 4κ 4 »2 kHz is arranged on the transmitter side, It is ensured that the normal audio signal cannot influence the first octet information. On the receiving end, one is then again able to detect the ter oct information 3 β »* * u, because the arrangement of the low-pass filter mentioned ensures that the normal information 2 does not occur has penetrated the spectrum of the re-stained information

From Pig. 3 it can be seen that in addition to the normal sound channel, the Tone 0 at the cut-off frequency f open air, another tone channel was seen whose carrier frequency is 2 f. This additional carrier 2 f an audio signal can then be modulated on again, i.e. as a £ insideband signal, like it through the streaked line 6 in 71g. 3 shown or as a double sideband signal. The latter is for example the case with a stereo signal close to the FCC system, in which the difference signal broadcast as a double sideband signal with suppressed carrier and where the stereo signal is localized at the location of the frequency f will.

According to the principle of the invention, it is now possible, even twice Send tersteoct information, for example by sending a first subcarrier with the frequency f. to the left side of the frequency f and on it a lower "inside sideband" indicated by line 5 is modulated, and on the reverse side of the frequency f a »wide carrier

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With 4 «r frequency f - feleft« ■ * on «in the lower Xin sideband 7 mod-. Hort will be · Fttr the audio channel running from the frequency O bit f dl «Prequens f. at the edge of the noise frequency for the second audio channel 2f dl «Frequency f - on the island lies · Da · nomale T on signal the · • e · second channel can then for example be given a duroh dio line θ Spread the frequency range so that nooh gets enough out for the duroh line 7 indicated hidden information remains

It can be seen that in all of the files outlined above, the hidden information, as far as frequency localization is concerned, is flashed in the opposite direction to the frequency localization of the information transferred to normal ... use the information shown on lines 1 and 2 increases the frequency going in relation to frequency O to frequency f. For dae spectrum of Ll nuoh * 3 never against it takes the going in the opposite direction of the frequency modulated on the subcarrier signals to "The same is true door a Vergleioh lines 1 and 2 with you Unie 3 in Flg. 3, and fCLr lines 6 and O opposite line 7 in this figure

In Pig. 4 is a AuafBhrungebelspiel is shown for generating a project-drawn information in a Fernaehubertragungasystsm · In ψ this Ausffihrungsbeiepiel- is intended in particular to a Ferneehflbertragungssystem for CCIH-Morm, wherein the line frequency f betr8gt ^ 15625 Ds Next iet in this Ausführungsbolspiel the frequency f of Hllfstrftgers At the same time as the wave frequency, which, as already explained at the beginning, offers the advantage that neither we maintain the UlIfβ-carrier on the transmitter, nor on the bottom side separate crystal oscillators and frequency dividers are necessary. The carrier frequency is fed via the line 9, which is connected to the mother contact by a first holder S _{1. The} image carrier signal is fed to a filter 10 of very high quality which is matched to the cable frequency fg. She· ·

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PHH. 2169

oes Trtgorsienal a push-pull modulator consisting of a first single modulator 11 and a second ring modulator 12 is then fed to the first king modulator directly and the second ring modulator 12 via a 90 "rotating phase network 13. The coded audio signals are taken from the source 14, the last End up as hidden information in the signal to be broadcast These coded signals are fed back to the ring modulator 11 directly and via a "wide 90 'rotating phase network 15 to the" wide ring modulator 12. The two output signals from the modulators 11 and 12 then become one Adding and filter stage 16 is supplied, at the output 17 of which the subcarrier f .. is supplied with the kinetic sideband signal modulated to according to the line 3 in Figures 1 and 3 · The through di The signal supplied by the source 14 can be an α speech signal effective as additional information compared to the normal signal transmitted in the frequency spectrum after line 2. The normal oil signal is fed via line 10 to stage 19, which contains a filter, the filter curve of which corresponds to line 2 in ? Ir, · 1. The audio signal supplied via line 18 can then, for example, be the comment on a football club in the language of the country in which the game is taking place. As the signal supplied by the source 14, the commentary can be a foreign reporter who reports on the football game in a language foreign to that country , while quelle I4 sin only speaks special comments intended for doctors. The output signal of stage 19 is fed to an adder 20, the other input of which is fed to the lower rear sideband signal coming from line 17.

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laughing addition and Yerstarkunc «raoheinen alto die normal« ad die met partch · Information at exit 21 and then know the normal toas transmitter »ugeffihrt which modulates the combined signal to a carrier f ^, • Date an extraneous signal with a spectrum «like ee in fig. 2 is depicted, enteprioht · Of course iet ee auoh moglioh, dae Output signal of line 21 on a magnetitonic carrier aafsuseiohnen tan can then both comaentaries onewaturea bit mm leitpwmkt the actual lohea TV broadcast, for which there «image signal on a« film fixed · » lect let.

However, if you want to use the signal that supplies the source 14 by switching on a receiver-side arrangement, the range of signals supplied by the source 14 has a width of By, which only affects 100 bit 200 Us and then does the spectrum shown in Fig. 3 pattt · If you consider »Aast in the normal lOnkanal of a television station according to the CCIB-Syοtea Alt frequency f almost 16 kilograms, it should be obvious, date, when the EilfttrSger f« is select 15625 Ez, only through the spectrum 3 · * »Tree is claimed from 15 ^ 25 Us to 13425 Πζ · You frequency f can then, for example, be 14 to 15 <: Hz £ 9loct , which is sufficient to transmit us every"i'oneifin& l "in normal Tonkijiel ·. It should also imply that you will not hear the first information from a normal person.

In Fif · 4 is .neegeben wuitor "that both) in the duct 'as ftuch existing in the line 10 signal, for example in a: may be taken from the television studio or in oinor ttepfanfessentrum existing" ernsehenpfftn ^ he 22 · This may of He is interested in the eurovlelonssendiincen as well as in the foreign trade. The outside broadcast van delivers the actual LiId and sound signal, which is then picked up with the SmpfCneer 22 and then broadcast, with the

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well pic. 4 the hidden intonation can be added · In this case, the switches S ₁ and S ₂ ia di · shown in Wc · 4. On the other hand, both the input control signal and the normal audio signal can be taken from a studio, so that the contactors S. and S _{2 are} stopped, and the auxiliary control signal is then sent to a generator 23 and the normal Tone signal taken from a generator 24. In this case, the UIlXstr8gersi £ nal supplied by the generator 23 can have the frequency f., Or a frequency f which is lower iil the line frequency f

Sb is also m9 £ lioh _f instead of a · television system · use a normal radio / radio station that sends the output 21 to a radio transmitter which modulates the carrier frequency of the Sundrunke system “The frequencies f au · · Then selDetTersttndlloh aa Rande dos for this RundXunksytftea Qbllohen XonVereiohs llegaa ·

In pi ^. 4, the television receiver 22 contains a receiver antenna 271, an Iloohfrequens- and Zvisohenfrequenteil 28, iron integrated picture and sound modulator 29, a picture amplifier 30 'sine' JlodergaberShr · 31, a GynchronirapulaaljtronnTorriehtunc 32, a horizontal beam 33. Here a spiral stage 33 ** Skissierte ^ npfSnger works on the basis of the known intermediary. In this case, the controller 37 serves to amplify the frequency-modulated dual-frequency signal, the frequency discriminator 3 is used to demodulate this signal, the amplifier 40 to provide a deaodulated signal and then the loudspeaker 41 to reproduce the low-frequency signal. The output } j of the demodulator gate 30 will lUßleioh unnoaraen the audio signal, the elnea \. _k ontact the switches S "is supplied.

Se korarit vor, dtioa in den .onkunu.1 a3 noraal Fornsehoonders

iat uufgenoiimen iltor one? _u off of just f the Zeilonfraquon *

β

stinat is. Tn serve case int es deohabl not aötlich, for the iiilfs-

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TrSgerslcnal to rummage through the cell frequencies, but is forced to - choose a somewhat lower frequency, because otherwise the auxiliary flow, modulated from the previous information, is suppressed by the filter incorporated into the aforementioned audio channel. Daait the door sections dos erflnduncegenBeaen syeteao be maintained, as dargestollt in Fig · 5, be moved · AITF this simple VeIso can aan these Difficult el ton from the paths go · As Fig · 3 Soaps, located dasu dea Hfttterkoatakt swisohen dos Sohaltere S ₁ and the filter IO a Misoh stage 2 / ,, which, in addition to the MIf control signal old of the line frequency t .. a signal old of the frequency f is transmitted by the Os-Bk slllator 25 · The

. Frequens f, for example, 200 related to 300 Bs, eo that on * .ueganc the Ulsohstufe 24 a new lilfetrBgersigasl ait dor Froquens f _u f * f is obtained which _n example la case of the CCIR ilystercs and FTIR T - 200 Is 15425 Bs cheats' Ia dicBca case has retained all gate parts of the system because, as can be seen from the ear friction in Fig. 6, in this case too, no expensive crystal isolator and troquon divider are necessary.

FIc * 6 is an old one of a denodulator device 42, with which it a8 (; borrowed 1st "the information aue dom -Onkanal winder audible su aaohen · 3er point, in dosn eieh dor JinpfSäger? 2 near Fi ( J. 6 differs from dom naoh Fig. 4, that sugleloh an image deflection stage 34 «ad Bildablenkopulen 36 sugelUct ad · Lu ^ loleh iet swisohen dea output 39 * ·· Froquons4ejwdmlator · 30 and dea Meaning la aaehetenden is explained · Toa an »output of the Proqusasdenodulator JB IHht a line 44 sun sugefilctet: Jynearoadetiodulator 42 and iha the desodullrte sound signal susufUhrc 1 · Simultaneously leads from dor Jeilenab ·

steering level 33 · 1η * Loitunf 43 eur Torrichtune 42, and you the Ze. lensjn-'tfironslfsal f. tuaufflhren WUu la obonotehen ready orwflhnt was,

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sathtlt ntmlioh da «picture signal lines-« ad picture syaohronsignal ·, di «for it ensure that ·· di · Stub «produces 33 line aynohron signals *, which precisely reflect the» ointment Frequen · and have almost the same Pha ·· as the transmit-related one Line frequency signal f ... Therefore it is not necessary to deaodulate the sw the Synohrondeaoduletorrorriohtung 42 required auxiliary carrier signal generate separately on the receiving side what, as already mentioned, Crystal losillators and frequency dividers in Yorriohtung 42 are unnecessary. Nevertheless, the necessary prtsiaion rollkoaaen he * aalten

The Synohrondemodul & torrorriohtung 42 contains a filter 45 among other things the line synhron signal of the line 43 into a sinusoidal signal, an Iiederlrequensrerstarer 46 to the dea demodulator 3 ° withdrawn corset frequency signal su reratarken, a Sjrnohrondet · ktor dt and "in a filter 40" to make sure that the audio information broadcast in the dioraal ia spectra 2 is not aa output of the filter 46 "rsoheint" with the output of the filter 4ü is the cutter contact of a switch 3 , tied together. In the position shown, the holder S connects the output of the filter 48 with a Uegiatrlsrrorriohtung 49t & i * that is used to measure the TV diodes. With "in" switched on, if there is a "teoct infontation" in a coded signal, the control direction 49 is tartan, after which the magnetic tape in the device 49, for example, at a later point ait zeiohen v «raeh« n, the su tea ia spectrvsi 2 auagaaaodtaa Prograaa g «h0r« «· wi ·« vvfhat, in 4i «aea case di · bandwidth B _y d ·· spectrum 3“ to 100 ue 200 Hs ··· • become more tact. Β _γ »ei beiapielaweiae 100 ils, then this encoded information supplied by the source 14 can consist in the first instance of a combination of three basic tones swisohen 0 and 100 Us, which can cause a stumbling block 49. This combination follows, for example

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• la · Xoablnation τοη β TBnen, dl · on dca BaAd la d »r Yorrlohtuag 49 la · foraatioaen des la dl · ·· »Register instant received Prograa ··

With 2 · 1024 data and below the assumption that ·· 1000 programs are broadcast by the ffooh «, then register aSohte, old dl · ·· ■ systoa da · band in the device 49 · 1» · week lan * Store information and, unless * after a week or two, be exchanged for “In n” u ·· Baad. Sa · alt Baad provided with rewards can then be sent to the central office, if all binders of all other la dea countries at Fernaeheapflagern arrange for the data recorded on the binders to do so. koa , ua «in picture. about dl · Fern * «hdioht · in dea country iu received ·

On the other hand, I at that · inventiontfealaM Syatea dasu bestiaatt the rerateokte information al · eeaond «rt« n Koaaentar tu beautsea »· ο ateaea the Sohalter 8. and S. uageaatt, ao da ·· dl · Tcrblnduaf BWisohea deaatorfrequendeaquen 40 interrupted, and a new loading swiMhen the output d ·· filter · 48 and the input of the Vlederfrequensreratlrkere 40 is established, waa by the dashed line UaIe in Flg. Indicated 6 1st "Bs are allowed · ψ elnleuohten that in theseA case just the hidden Inforaation la loudspeaker Rather is geaaoht hSrbar 41" This Systea 1st example applicable when SiOH is the Fernaeheapflnger 22 at eiaea Arst, the nioht normal spoken Koaaeatar au elnea Fernaehbild Hear aSohte, but rather the beautiful Koaentar, which is broadcast exclusively for Xrste. Ia latter case is broadcast an audio signal "the hinalohtliah the neraalen Inforaatlon dea Spektrua 2 aaoh Hg · 1 and hiaslohtlloh the rereteokten Inforaation dea Spektrua) this figure · The bond width By can la theseA case concerned for example 0 Kus, the _τοη Β γ oa . G kJz. SelbstTorstfindlloh alnd dl · ·· values are only approxoaaea, and aan can naoh choice Bg wider aaoh «n · £ · is ebeafalle

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Possibly the line shown in Fig. 6 by the dashed line connected to the switch S, of a device for magnetic Record sound to feed audio signals. In this "case the de" Hidden information extracted from the filter 40 is stored on a magnetic carrier. This can be important, for example, if the hidden See information on PoIiseidurohsagen »

In the above it was always assumed that the television system works in accordance with the CCIR standard, with the normal audio signal being frequency-modulated is. If you work with other standards in which the normal audio signal is amplitude-modulated, the ™ is also used for this system according to the invention applicable. Only in this case must the entrance of the amplifier 37 with an output of the Hooh- or Zwisehenfxequenteils 28 can be connected. The detector 36 is a normal peak detector, which demodulates the amplitude-modulated signal

The use of synchronous detector 47 also offers the advantage that high selectivity is achieved in that the low-pass filter 4 is arranged at the output of synchronous detector 47, which also lets through the low frequencies of the demodulated audio signals. For example, when assuming that the frequencies of the reception side ä • wipe O and 100 Hz are, then the bandwidth needs of this low-pass Filter 40 only 1üO Us be shown below in order to avoid that the frequencies of the sound signal, which are between the frequencies 0 and f, in Output signal of the detector 47 occur. In this way it is guaranteed with almost £ 100 certainty that the registration apparatus 49 will not start and register incorrectly.

You can also simplify the Modulstorprinsip on the sending side · So For example, the device according to FIG. 4 can be placed between the generator 14, which supplies the coded audio signal for the hidden information, at the input of the filter 16 consist of a simple breaker,

BATH

11 · ^B

H". 24 *>

tea there, "Bllfetrlgeralgaal ait the Frequeas f ■ mfvfthvt is" ad whose Qnterbreeherrh / Thaus durob that of the generator 14 entneaaene sound be · stiaat is * Uin such breaker, for example, ait Help • ines oodlerten Loohetreifene be operated autoaetleoh · Oer Ünterbreohuncsrhjthaue at the Seaderselte Then, in each case, the start of the companion Torrlohtuag 49. Auseerdea contains this information near the start of the Iaferaation for that through the start! a 1 out of 8 code, (through the Uaterbreoher, lapulses can also be formed "from which, according to Belleben, a" number can be omitted "such as

e>

for example with dea 1 out of 5 Codβ is known to the Telegraphic) again 2 ⁸ - 1024 data are determined «va * geaflgt» over every · Prograaa

Register SU. *

Sohllesslioh is sketched in fig · 7 a syaehrone detector braid 42, which is adapted to the fact that the transmitter side by means of a device near · 5ι a door frequency ί _{χ is} delivered · In the · sea case, the synchronous detector 42 is a smsfttslloher oil frequency oscillator 50 sucefQgt which delivers a liederfreejaeassigaal ait the frequencies * _T " of, for example, 200 Ha, aad swisehen the STnohroadetektor" ad the filter 48 Ht a mleoa level $ 1 Tergeeehen. If the frequencies of the signaled signals are, for example, 0 "to 100 Hs, they will be 100" to 500 Hs. In the Mlsohstufe 51 «« vdea then the fregmeniea Tea 200 to JOO

Us back to Frequensen tone 0 to 100 Hs tsftfesetst. Although this is the yer

. ■ '···. part offers that the filter la der uegietrlerrorrlohtunc 49 elnfuoher can be carried out, offer even more festive opportunities. i «on can just as well for f · 15425 Hs at the Aapfanfisselte as an auxiliary carrier Frequent use and then the filter 4β a swl see 200 and JOO Hs

0SM19 / H1I

FHN.

give lying bandwidth. In this head, the filters in the registering device 49 must also be tuned to a frequency which is 200 Hs higher, all for the case that the frequency f de-pries the frequency f. The filters are then about · more expensive, but not a separate oscillator ^[ j0 and a mixer stage 51 a ·

Also in the event that an oscillator 50 is used, this can be a simple RC-Oeeillator and with sufficient accuracy it can be ensured that the signals required for the device 49 are supplied by the synchronous detector device 42 will. "

It should also be clear that if a radio receiver is used instead of a vacationer, the configuration 42 its circuit structure is almost impossible to use Frequency f has to be output, replaced, and then a rough crystal oscillator with a subsequent frequency divider, because only then can the auxiliary frequency be generated with sufficient certainty. As for the line 44 · erfordevliohe sound signal is daiin the Detketor deo initially au .dfunkaystea belonging Rundfun3; receiver taken · ä *

009817/1111

Claims (1)

tftvntanv prflohvi Transmission system for the transmission of all kinds of information la «lava Tonkai *« ines normal r'erneehayateaa, old vlaar bandwidth of oa · 0 ei · ftwa 41 · line repetitionafrequena, thereby g · recognizable, daaa dl «« ua alt a Frequvnt f aa hand · 4 ·· horaalvn v «rftgbar« n Yfabfrfifhf d ·· T «akanala is transmitted,« obal dl · Fraquantlage is »uvfiislieh über« rtrae «n« a information vntffegvae * aetst rfrleht «t« u 4fr aoraal la dlaaea Toakaaal 8v «r« trzg9n »n Inforeatlon let. 2. Obertraicunifanyet ·· aaoh aaaaruoh 1 «da4utffh ffkfaatfifaaft» 4a ·· fttr 41f Prequen * f _p dea Hllfatriff «r · dl · £ ell« n «l * 4« rltolun (ffrvqu «a · f £« avkühlt. J 9transmission «7« ajrat «a aafh fla ··) 4fr * afprtfbf 1 o4fr 2, daduroh ffkfaasfifaa *% _t 4a ·· in the sound channel • · Β4 ·» · 1ϋ§ «la Tiffaafff 11 Ur« affeaoaaen i «t _t 4faafa Grvnafrvqeen · (f _ft ) nledrlgvr tft al · 41 · rrlferfr «qttvns (*" ,,) ♦ v * rrlag «r't o · die Hendfrcltv de · under ·· Binafit * aban4 ··· 4. Cbartragungaa / «t« a aafh fia ·· 4fr vfretfb «a4fa« aaprQoh «, b« i den sea measuring the. This is characterized by the fact that information is modulated as additional information from Xrlftr and the frequencies t aa hand of the normal phone range, and svar alt such low levels "frequencies that theeae aualtfHigh information ail Ίβη normal bapfanaca · ™ averaging is not audible. · 5. 3bertra ^ ungaajrat «a door transmission of sualitliohffa information in one Tonkanal a · normal Kernaehfunka / atea neeh einea der <· Β · ρτβοΐΜ 1 blf 3t Zfilen- uad lellblldeynohroaalfaaU modulated onto an image carrier eathaltende Olldelgaal · uad vln * a roalrlcer aafa «4ttll« rtf Tfaalgaalf ff «4fr · • eltig auageatrahlt, daduroh marked «da ·· 41 · waratffklf I ·· foraation on the other side old UnterdrOoklng de · auxiliary · trieur · la etaer Modulaliur BAOORIOINAL -ao- rax. J46}. means a subcarrier having the frequency fg of Zellensynshroaaigaale is aufaoduliert and dase empfÄngereeltifc a Synohrondetektor combined lft _(TEM daa the sound channel of the su this system belonging television receiver · ent-Bommene sound signal and a the Zeilenablenkschaltune this Bmpftnfers taken from signal with the V.'iedarholungefrequena the "Line sync signals is supplied. 6 · transmission says tern naoh claim in which an image carrier on · modulated row and Teilbildsynohronsigaale image signals containing UFTD 4 "sur transfer of information la a Xonkanal a normal television broadcasting system" -this sound carrier modulated sound signals are ausfestrahlt transmitter side "μ" ad in which τοη for recording data as to the television torrent to the Toaaig · »paint impulsive signals su & efu £ t» and swar sua sinao hold elaor old a television receiver belonging to this system Tarbnadenea Itgittrlt »· ▼ orrichtunc» which registers the eleventh eiacesetohaltstad programs received by the avpftager A pulse-shaped signal on the transmitter side can be modulated to an auxiliary carrier old the frequencies of the line aural signals in a modulutor device with suppression of the auxiliary carrier e signal and a signal taken from the line deflection circuit of this i &pflager old of the frequency of the line synchonous signals is transferred to one of claims 5 or 6, in the case of dea in the audio channel on the transmitter side a filter which is sampled to the cell frequencies f "aoaaen iat, daduroh identified daaa the Modulatorrorrlohtuag »eaderseltig an auxiliary ossillator sum of the abbreviations of an ilfseigaals old of an all frequencies f, and a line ear device for converting the frequencies f _{u of} the ei ^ B B High auxiliary ^ träßereicnals on a Frequens f - f "- f contains, whereby the If the frequency f is selected so low, the frequency f is currently not aekr äs _Λ m by blocking the filter transmitter tuned to the frequencies ootn-7/111 β · Adapter zua Aaaohlu ·· »a olaen« feafSas · *, the Ia «iaea Bb * rtnqpiagaag (etea Mioh dos * nruehen 1, 2, 3, 5 tthe 7 is rexweadet 9 · Adapter according to Anipruoh θ »däduroh gekMUMlohnet, date the ·· * means sua Kirieugen do · auxiliary carriera, eiaezf üyaohrondotakt · * and «lttel ma coupling a · eratan finganga de · detector α an «la · ^ leame de · lOnkanal · de · ^ pfSnfere sur atotnahae deo detect Xone signals ana Uapf & nger,« ad -ittel na ftiftthrea de · HilfatrSfore an olaen a further return this · detector · eatbllt · 10 · Adapter according to Anepruoh 9, daduroh fkeaa — ioaaet _t da · «Al · Mittel sua jür · Muj «B de · Hilfatrlfera au · an Aakoapluaf de · .sveiten üiafaaf · dee ayaohroa · detector · to the line elenkatuf · eiae · f «aMMAaaariager · eeetehea» aa dea en »Adapter anfaeoaloeeen is · 11 · Adapter naoh Anepruoh 10, daduroh jekennMleanet, that ·· the adapter one BllfM3iillator * ua Krieueen eise · flilfMipial · alt der? Reqoeas Γ and eiae MiMliTorrlohtuae sub Uaeetiea des dea & tya * hroadetektor entheaaeae · signals • nthllt. ^ 12 · Reciotrioryorriohtunt sun .aisohluaa aa ela - anyflagvar la eiaea Syatoa aaoh one dor ansprtteae 4t ^ or 7 1} · Bogietriervorriohtung naoh «aapruah 12, daduroh gekenaseiehnet _t that« die? «Rriehtunc a synohrondetektoXt kit aua Aakefpeln ·· erata« de ·detectoro an oine Klassw elaes Toakaaal · «ia · te· for dl · ··· äyMaMa Fernaeheapflagers sub autasaaaa dee «« t «ktievt« a i'eaeigaale «ad Llttel sub Aakeypeln eiaea sveiten ibingang · de · Oeteict · «· aa dl · Selleaafeleakattfe dee Feraee loapffingere contained 14 · Directed by tr iervorriohtunü aaoh «aepruoli 13» because ·· the forriohtung an ilfeoesillator sub KrMUfeä «la · β help carrier & gerelgnale alt d ·» Frequency f and oine llieohvorriohtuag sub Uerubtransforaieren dee den J / nohroa · detector ontnooaeno.i iitnölo contains 15 · H.-iiietriorvorriohtunc auoh knepruoh 12, daduroh gekennselohnet, daae die Torriohtuni; Means sur Crsoucung a · MlIf · mourning, a Jynohrondet «ktor, _; . 00M1T / I11. BAOQF) IQfNAL κατ · 2469. 1 * 62291 Means for coupling a first input of the synchronous detector to "ine Kle" a * of the sound channel of the ^ apf & rigers sub with the detected sound signal * and Means for supplying the auxiliary signal to the wide input of the detector contains. 009817/111 "BM ORIGINAL