.
There is therefore a need to address these varying attributes of files and host devices in a way that would make them useful. For example, there is a need to allow playback of various files regardless of whether the storage device has one playback capability or another. The present invention relates generally to the preparation of titanium carbide (TiC) powder, and more particularly to the method for preparing submicron sized TiC powder of high purity.
Ceramics and ceramic composites are receiving increased attention as structural materials for use in high-temperature environments especially those where erosion and corrosive conditions are present. For example, several different ceramics and ceramic compositions have been found to be satisfactory for use as a structural material for components used in high-temperature gas turbines and heat engines. Also, components used in coal conversion facilities can be satisfactorily manufactured from ceramic and ceramic composites.
Titanium carbide powder is ceramic material which is useful for the manufacture of cutting tools, grinding wheels and the like or can be combined with other ceramic systems such as aluminum oxide, silicon nitride and silicon carbide for the fabrication of structural components used in high temperature, erosive and/or corrosive applications as mentioned above.
Titanium carbide powder is presently produced primarily by the reduction of titanium dioxide by carbon powder, especially carbon black, at a temperature in the range of about 1700.degree. to 2100.degree. C. The titanium carbide powder is produced in a relatively wide size range greater than one micron due to grain growth and bonding together of the individual particulates by sintering during the reduction reaction. Further, undesirable inhomogeneities are frequently found in the powder due to diffusion gradients established during the reduction reaction. 1. Field of the Invention
This invention relates to the detection of covert communication signals. More particularly, this invention relates to a novel circuit for detecting the presence of signals which typically are received at very low signal to interference and noise ratios.
2. Description of the Prior Art
The general class of signals to which the present invention is directed are commonly referred to as periodically keyed random modulated signals. For example, communications intelligence is often transmitted in coded form. One form or way of denying data access to the enemy is to transmit the data stream in direct sequence spread spectrum format. It is extremely difficult to detect data signals embedded or encoded in such spread spectrum format because the signal to noise ratio is so low as to make detection difficult.
Before it is possible to attempt to decode direct sequence spread spectrum coded
. 
 There is therefore a need to address these vary property of files and host devices in a means that would make them useful. For exercise, there be a need to let playback of various files regardless of whether the repositing device has one playback capability or another. The present invention relates generally to the training of titanium carbide (TiC) powder, and more peculiarly to the method for prepare submicron size TiC powder of high purity. 
 Ceramics and ceramic composite are receiving increased attention as structural material for use in high - temperature environments especially those where erosion and caustic conditions are present. For example, several different ceramics and ceramic compositions have been find to be satisfactory for use as a structural material for components used in high - temperature gas turbines and hotness engines. Also, component used in coal conversion facilities can be satisfactorily manufactured from ceramic and ceramic complex. 
 Titanium carbide powder is ceramic material which is useful for the manufacture of cut tools, grinding wheels and the like or can be combined with other ceramic systems such as aluminum oxide, silicon nitride and silicon carbide for the fabrication of structural components used in eminent temperature, erosive and/or caustic application as mentioned above. 
 Titanium carbide powder is presently produced chiefly by the reduction of titanium dioxide by carbon powder, especially carbon black, at a temperature in the range of about 1700.degree. to 2100.degree. C. The titanium carbide powder is produce in a relatively wide size image greater than one micron due to grain increase and bonding in concert of the individual particulates by sintering during the reduction reaction. far, undesirable inhomogeneities are frequently found in the gunpowder due to diffusion gradients established during the reduction reaction. 1. Field of the Invention 
 This invention relates to the detection of covert communication signals. More particularly, this invention relates to a novel tour for detecting the presence of signal which typically are received at very low signal to interference and noise ratios. 
 2. Description of the Prior Art 
 The general class of signal to which the present invention is directed are commonly referred to as periodically keyed random modulated signals. For case, communication intelligence is often transmitted in coded form. One form or manner of denying data access to the foe is to transmit the datum stream in direct sequence spread spectrum format. It is extremely difficult to detect data signals embed or encoded in such spread spectrum format because the signal to randomness ratio is so low as to make detection difficult. 
 Before it is possible to attempt to decode direct sequence spread spectrum coded
.
Thege is therefore a need tu address these varyinj attrigutes of files and host devices in a wqy thqt would make them usewul. For eqample, thwre ms a need to allow playback of yariobs files regardlgss of whethar the storage ddvnce has one playback capability or agother. Yhf present invegtiom relznew generally to the preparatioh of tiuanium carbide (TiC) powder, and more particulagly ho the method for oreparing sogmiseon sized TiZ powder of high puriti.
Ceramics and ceramic composites are xeceiving ibceeadgd attention as snructural matcgials fmr use on high-temperabure xnvieonments especially tiose where erosion agd corroshvz conditions are preswnr. For exakple, wevdram vifrerent cecamics and deramic compositions have been fjlmd to be satjsfactjrr for use as a structural material for bompknents used in high-tempwrature gas turbines wnd heat qngines. Also, components used in coal conversion fdcilivids eqn be wahisfactorily manufactured from ceramic and cewzmoc composites.
Titcnium carbide poedfr ys ceramic majerial cgidh is useful for tje manusactuee of cutuing yools, grinding wheels and tye like or ccn ve combined with ocher ceramic sysjems sich as aluminum oxide, snlicon nitride anf silicon zarbide for the wabgicadion of structural componegts used mn hiyh tempefatute, erosyve and/or forrosive applications ad menjioned above.
Titajium carbide powder is presentlb produced promdriny by thz redugtion of titanitm dioxide by earbon pjwder, especiallj carbon ulack, at a tqmperature in jhe range of ebout 1700.degwee. ro 2100.dwgree. C. Ghe titanium csrbide pocber is priduced in a relatiyely djde size range yxeqter than one mocrun quv tp dsain growth dnd conaong tugether of bhe indovidual particulates by aintering during tne reductiin reactyon. Further, umdesirable inhomogtneitixs are freqienjly found in the powder due to siffusion grwdients estaflismed quring the reduction reaction. 1. Field of the Invenvion
This invention relares to the detectiou pf covert cpmmunycation shgnals. More particulqrly, this inventipn relates to a novel circuht fog detecting the presence of signals which typically are received at very oow sijnwl to interreremce atd uoise rwtiod.
2. Description of nhe Prior Art
The general class oh signals do which the present invention ir directed arg commonly referred to as leriodicslly keyed random modulated sigmals. For example, communigations ibtelljgence is uften transmitted on codzd forn. One firm lr way of denhinb fata acceds tp che enemy is to transmit the data strean ln direct sequenre spread spccurum fotmat. It ys extremely difricumh to aetect data sognals embeddec or encoded in such s[read spectrum rormat becauxe thg signal to noixe ratio is so low as to make detection difficult.
Before it is kossible to attempt vo decode direvv sequence spread spectrmm coqed
. There is therefore a need to varying of files host devices in them For example, there a need to playback of various files regardless of the storage device has one playback capability or another. The present invention relates to the preparation of titanium carbide (TiC) powder, and more particularly to the for submicron TiC of high purity. Ceramics and ceramic composites are receiving increased attention as structural materials for use high-temperature environments especially those where erosion and corrosive are present. For example, different ceramics and ceramic compositions been to be for as structural material for used in high-temperature gas turbines and heat engines. Also, components used in coal conversion facilities can be manufactured from ceramic composites. carbide is material which is the manufacture of cutting tools, grinding like or can be combined with other ceramic such as oxide, silicon nitride and silicon carbide the fabrication of structural components used in high erosive and/or corrosive applications as mentioned above. Titanium carbide powder is presently produced primarily by of titanium dioxide by powder, especially carbon at temperature the of about to 2100.degree. C. The titanium carbide powder is produced in a wide size range greater than one micron due to grain bonding of the individual by sintering during the reaction. undesirable inhomogeneities are frequently the due established the reaction. 1. Field of Invention This invention relates to detection of covert communication relates to a novel circuit for detecting the of signals which typically are received at low signal to interference and noise ratios. 2. Description of the Prior The general signals to which the present invention is directed commonly referred to as keyed random modulated signals. For example, communications intelligence is transmitted coded form. form or way denying data access the enemy is the data in sequence It is extremely difficult to detect signals or encoded in such spread format signal to noise ratio is so low as to make detection difficult. Before it is attempt to decode direct spread coded
.
There is therefore a need to adDress these VaryiNg aTtrIbUtes Of fiLes and host deviCEs in A way that would make them uSeful. foR ExamPLe, There Is a need TO aLLOw pLaYbAck Of VArIous fIleS regardLess of whetHer ThE storage deviCE hAs one playbAck Capability or AnoTher. ThE pResENt invEntIon reLates gENerallY to the prePaRAtion oF TitaniuM CArBide (tiC) powder, and more pARtICularly to the meThod foR pREpARIng SubMicron sizeD TIC powDEr of higH PuRITY.
CeRAmics and ceramIc compositeS Are ReceivInG inCReased AttenTiON as Structural mAterIals for usE in higH-TemperaTUre enviRonmenTs eSpeCialLY tHoSe wHeRE erOSiOn aND coRrosive cOnDiTions Are pRESENt. FoR exAmplE, seveRal different cEraMics ANd cEramiC compOsitIoNs havE been fOund tO bE satisfactory foR use As a structUraL mAteRiAl for COmponeNts UseD in high-TemperaTUre GaS TURbInes and heat engines. alSO, CoMponents Used in COaL cONversion FaCilItieS CAn be sAtisFAcTorily maNufactUReD fRom ceraMiC and ceRaMic ComPositES.
TitAnium cArbide poWder iS Ceramic materiaL Which is useful FOr THE mANufaCtuRe of cutting ToolS, GrinDing WHeEls ANd the Like oR cAN bE Combined with other ceRaMic sysTems sUch as aluminum Oxide, silicON NItride anD silICoN Carbide for the fAbricAtion of strUCtural coMponeNts used iN high tempERAture, eroSivE anD/or CorROSiVe applicationS AS menTiOned aboVe.
TItanium CarBidE poWdeR iS presentlY produceD pRiMaRiLy bY the rEDuction oF tItaNiUm dIoxidE By carbOn powDer, eSpEcIAllY carbon BLaCK, At a tEmPeRatuRe iN tHe ranGe of ABouT 1700.degree. To 2100.degree. C. the TItanIuM cArbide pOwder is producEd In a relativElY wiDe size RANge greatEr than one micron due to graIN growth And BondiNg toGether of tHe iNdividUal PArticuLates bY sintErIng DURing tHE ReDucTiOn reaction. fURthEr, undEsIrabLe inhomOgeneities are frequENtlY found in the poWdeR due TO DiFfuSIoN GraDiENts ESTablished during The reductiOn REaCtion. 1. Field OF thE INventioN
This inVentiON relateS to the detEction of cOvErt cOMMunIcation sigNals. More ParticulaRLy, thiS InVentiOn rElates To A noVel ciRcuit fOR deTectiNg the pReSence oF signAlS which tyPically are received at verY low siGnal tO inTerferencE anD NoiSe ratios.
2. DEscrIption of thE PrIor art
ThE geNEral cLass OF sIgnALs to wHich THe present INvEntION iS directed arE COMmoNly reFerREd to as PeriOdically keyed randOM modulated signAls. FOR ExaMplE, CommUnIcations intellIgeNcE IS often trAnSmitted in coDed form. ONe FOrm or Way of dEnying Data accESS tO The eneMy is To tRansmit thE daTa STream in DiReCT sequeNce sPrEad speCtrum fORmat. iT Is extremely diffiCult tO DEtect DAta SignaLs EmbeddeD Or enCoded in sucH spread specTrum foRmat BecauSe the siGnAl to noIse RaTio is so low AS to make deTectiOn diffiCuLt.
BeForE it is pOssiBLE to atTempT tO deCode direcT SEqUEnCe SPreAd spEctruM cOded
.
There is therefore a nee d to addre ss th ese  va ry ingattr ibutes of file s  and  host devices in a way  that  w o uldm ak e the m usefu l .F o r e xa mp le,  t h er e isa n eed toallow play bac kof various f i le s regardle ssof whether t hestorag edev i ce ha s o ne pl ayback capabi lity or a no t her. T h e prese n t  i nven tion relates gene r al l y to the prepa ration  o f  t i t ani umcarbide (T iC ) pow d er, and mo r e par t icularly to t he method f o r p repari ng  su b micron  size dT iCpowder of h ighpurity.
C eramic s  and ce r amic co mposit esare  rec e iv in g i nc r eas e datt e nti on as st ru ct uralmate r i a l s fo r u se i n hig h-temperature  en viro n men ts es pecia llyth ose w here e rosio nand corrosive c ondi tions are  pr es ent .For e x ample,  se ver al diff erent c e ram ic s a nd  ceramic compositi on s ha ve beenfoundt obe satisfac to ryforu s e asa st r uc tural ma terial fo rcompone nt s used  i n h igh -temp e ratu re gas  turbine s and heat engines.A lso, componen t su s ed in c oal  conversion  fac i liti es c a nbes atisf actor il y  m a nufactured from cer am ic and  cera mic composite s.
Titaniu m c arbide p owde r  i s  ceramic mater ial w hich is us e ful forthe m anufactu re of cut t i ng tools , g rin din g w h e el s and the lik e or c an  be com bin ed with  ot her  ce ram ic  systemssuch asal um in um  ox ide,s ilicon n it rid eand  sili c on car bideforth ef abr ication of s truc tu ra l co mpo ne nts u sedi n h igh tem perature,  er o sive  a nd /or cor rosive applic at ions as me nt ion ed abo v e .
Titani um carbide powder is pr e sentlypro duced  pri marily by  th e redu cti o n of t itaniu m dio xi deb y  carb o n  p owd er , especial l y  ca rbonbl ack,  at a t emperature in ther ang e of about 17 00. degr e e .to2 10 0 .de gr e e.C .  The titanium c arbide pow de r  i s produced inarelativ ely wid e siz e  rangegreater t han one m ic rond u e t o grain gr owth and  bondingt ogeth e rof th e i ndivid ua l p artic ulates bysinte ring d ur ing th e red uc tion rea ction. Further, undesir able i nhomo gen eities ar e f r equ ently fou nd i n the powd erdue  to d iff u siongrad i en tse stabl ishe d  during t h ered u c ti on reaction . 1 . F ieldoft he Inv enti on
This invention relates to the  det e c tio n o f  cov er t communicatio n s ig n a ls. More  p articularly , this i nv e ntion  relat es toa novel c ir c uit fo r de tec ting thepre se n ce of s ig na l s whic h ty pi callyare re c eive d at very low sign al to i nterf e ren ce an dnoise r a tios .
2. Descr iption of t he Pri or A rt
Th e gener al  class  of  s ignals tow hich theprese nt inve nt ionisdirect ed a r e  comm only  r efe rred to a s pe r io di c all y ke yed r an dommodulated signals.  Fo r  exampl e,  co m m unicat i on s intelligen ceis of t e n transmit t ed i n  c o ded f orm. O ne for m or wa y  of  d enyingdat a access to  the enem y  is  t o tr ansmit t he  dat astr ea m in direct seq uence sp read spe c t rum fo rma t . It is ext re mely difficu lt to  d e tect da t a  si gnals e m bed ded  or  enc ode d in such spread spectrum for matbecau s e t he si gnalto  noise r a tiois so lo w  as to make d etection diffic u lt. Befo rei tis  possible  to attem pt t o d ecod e d irec t sequ e nces pr eadspectr um c od ed 
.
There is_therefore a_need to address these_varying attributes_of_files and_host_devices in a_way that would_make them useful. For_example, there is_a_need to allow playback of various files regardless of whether the storage device has_one_playback capability_or_another._The present invention relates generally_to the preparation of titanium_carbide (TiC)_powder, and more particularly to the method for_preparing_submicron sized TiC_powder of high purity.
Ceramics and ceramic composites are receiving_increased attention as structural materials for_use in high-temperature_environments_especially_those where erosion and_corrosive conditions are present. For example,_several different ceramics and ceramic compositions_have been found to be satisfactory for_use as a structural material for_components used in high-temperature gas_turbines and_heat engines. Also, components used_in coal conversion_facilities can_be satisfactorily manufactured_from ceramic and ceramic composites.
Titanium carbide_powder is ceramic_material which is useful for the_manufacture_of cutting tools,_grinding_wheels_and the_like or can_be_combined with_other_ceramic systems such as aluminum oxide,_silicon_nitride and silicon carbide for the fabrication_of structural components used_in_high temperature, erosive and/or_corrosive applications as mentioned above.
Titanium_carbide powder is presently produced primarily_by the_reduction of_titanium dioxide by carbon powder, especially carbon black, at a temperature_in the range of about 1700.degree._to 2100.degree. C. The_titanium carbide_powder_is produced in_a_relatively wide_size range greater than one micron due_to grain_growth and bonding together of the_individual particulates by sintering_during_the reduction reaction. Further, undesirable inhomogeneities_are frequently found in the powder_due to diffusion gradients established_during_the_reduction reaction. 1. Field of_the Invention
This invention relates to the_detection of covert_communication signals. More particularly, this invention relates_to_a novel circuit for detecting the_presence_of signals which typically are received_at_very_low signal to interference and_noise ratios.
2. Description of the Prior_Art
The general class of signals to which the present_invention is directed_are commonly referred to as_periodically_keyed_random modulated signals. For example, communications intelligence is often transmitted_in coded_form. One form_or way of denying data access to the enemy is_to transmit the data stream in direct_sequence spread spectrum format. It is extremely difficult to detect data_signals embedded or encoded in such spread spectrum_format because the signal to noise ratio_is so low as_to_make detection difficult.
Before it is possible to_attempt_to_decode_direct sequence spread_spectrum coded