A

DSP 6000 Digital Transmission System

� CD Quality

� Spectrum Efficient

� Higher Gain

� Constant SNR

� No Crosstalk

�No Background

Chatter

�No Phase Distortion

� Multiple Hops

� Direct Digital I/O

igital audio tapes, compactdiscs, digital cartridges andother digital storage media

have made significant inroadstoward the culmination of the �alldigital� radio station. Tradition-ally, excessive bandwidth require-ments have made the transmission

of digitized high-qualityprogramming impossiblewith narrowband studio-to-transmitter links.After years of work in theart of applying advancedtechnologies to the causeof a clean and transparentsound, Moseley intro-duced the world�s firstspectrum-efficient, CD-quality digital STL�theDSP 6000. Designed toachieve the widest pos-sible array of desirablecharacteristics, this open-architecture, modularsystem features interna-

tionally accepted digital connectiv-ity, multichannel capability andharmonious coexistence withanalog radios.Following the phenomenal successof the DSP 6000 with over 2000units installed in the first threeyears, Moseley is proud to unveilthe new DSP 6000�giving newmeaning to technical innovationand the relentless pursuit ofproduct perfection.

The UltimateDigitalTransmissionSystem

RARELY DOES TECHNOLOGYHAVE THE POWER TO

DELIVER SUCH DIVIDENDS

D

Above: The DSP 6000 systemconsists of the DSP 6000E Sourceand Channel Encoder, the DSP6000D Source and Channel Decoderand any Moseley digital-ready STLtransmitter and receiver. The DSP6000E and DSP 6000D can also beused with other FM radios and/ordigital circuits.

Right: State-of-the-art audiophilequality comes to audio transmission.

The Digital Advantage

� CD Quality Digital Audio

� 90 dB dynamic range

� Constant dynamic range for all frequencies 30 Hz � 15 kHz

� 80 dB crosstalk due to digital multi- plexer

� THD .01% at 1 kHz

� Selectable efficiency of 1, 2 or 3 bps/Hz

� Choice of ISO/ MPEG or sub-band ADPCM source coder

he DSP 6000 offers broad-casters the opportunity toconvey CD-quality audio

between studio and transmissionfacilities. Stations going �all digital�will present a sonic advantage

equivalent to the LP vs.CD. In addition, theDSP 6000 uses technol-ogy to resolve STLproblems that negativelyaffect sound and at thesame time has a positiveeffect on the bottomline.

Instant PaybackIt is no longer necessaryto upgrade to expensiveantennas for longersignal path lengths.Compared to analogsystems, the DSP 6000requires 25 dB lesssignal to deliver 90 dBdynamic range. Thisreduces antenna andtransmission line costs.

Constant SNRFades have no effect onsignal-to-noise ratio(SNR). The DSP 6000

delivers its full dynamic range allthe way down to the digital thresh-old. So, even quiet passages remaincrystal clear and virtually noise-free.Spectral Efficiency

The DSP 6000 can operate inexisting channel allocations from100 kHz to 500 kHz, coexistingwith already established radios.

Selectable Spectral EfficiencyThe DSP 6000 offers a choice ofspectral efficiency of 1, 2 or 3 bps/Hz. Higher efficiencies allow atradeoff between system gain andoccupied spectrum.

Degradation-Free Multiple HopsMultiple signal hops have no effecton a digital signal. With the DSP6000, SNR, frequency response,distortion, stereo separation andcrosstalk remain consistentthroughout the entire signal path�no matter the number of hops!

Choice of Source CoderThe DSP 6000 allows users tospecify a choice of ADPCM or anISO/MPEG source coder. Con-tinuous development work willallow choice of additional sourcecoders. Source coder flexibilityallows stations to tailor their soundaccording to interface or formatconsiderations.

Direct Digital InterconnectionThe DSP 6000 has a built-in AES/EBU digital audio interface toaccept and/or deliver digital audiofrom/to other digital audio devices.Such connection eliminates mul-tiple A/D and D/A conversions.

T

Instant Payback Constant Signal-to-Noise Ratio (SNR)

Spectral Efficiency Degradation-Free Multiple Hops

The Challenge ofDigital Transmission

Moseley is the pioneer and world�sleading manufacturer of aural

microwave links and supervisorycontrol systems. Moseley products

are in service in over 100 countriesworldwide.

Linear 16-bit PCM for broadcast-ing (15 kHz audio) requires 512kbps/channel at 32 kHz sam-

pling rate. A typical STL configura-tion might require two 15 kHzchannels for stereo and one 7.5 kHz

SCA channel yielding anaggregate data rate of 1280kbps. It is this high datarate that has made previ-ous attempts at digital STLusage in the 500 kHz (and300 kHz) bandwidthsimpractical. The requiredspectral efficiency suggeststhat complex codingtechniques are necessary tosqueeze the data intostandard broadcast chan-

nels. Such coding may be parti-tioned between source and channelencoding techniques to reduce theburden of complexity on either.

To choose the right source coder,you must accommodate severalapplication-specific requirements:quality, bit rate, delay, bit errorprotection, post-processing capabili-ties, and hardware implementationcomplexity. The DSP 6000 offers achoice of two source coders: the

ISO/MPEG Layer II and a sub-band ADPCM source coder.The sub-band ADPCM encoderuses linear prediction and backwardadaptive quantization to encode thedifference between successivesamples of music. Complexity ismoderate as opposed to removingspectral components of musicaccording to a subjective psychoa-coustic algorithm; thus, its delay isonly 3.8 ms. With lower delay, aprofessional announcer will haveless of a problem listening to hisvoice off air during a live broadcast.In addition, ADPCM has excellentbit error immunity and gentle errorhandling, offering great benefits inbroadcast radio transmission.The ISO/MPEG algorithm hasbeen accepted by the radio industryas the standard for digital bit ratereduction. The principle of theISO/MPEG standard is based uponthe psychoacoustic properties of thehuman ear (i.e., the way the humanear processes information). One ofthe important characteristics ofhuman hearing is a phenomenoncalled spectral masking. In a typicalaudio signal, there will be severalfrequency components of such

�16-bit linear PCM

�Fits in existing channels

�Optimal partitioning

�State-of-the-art source/channel coding

Moseley�s knowledgeable staff ofsales, administrative, and technicalpersonnel are an important part ofour commitment to problem solving.

magnitude that they will maskadjacent signals below, thus forminga masking threshold. Since thehuman ear cannot distinguish anysignals below this threshold level,the transmission of bits that con-

tain this information isunnecessary. ISO/MPEG Layer II hasbecome an industrystandard for use indigital transmissionsystems. However, it isa more complex algo-rithm resulting in alonger coding delay.Care was taken in thedesign of the DSP 6000to allow direct digitalinterface with compan-ion equipment in thebroadcast chain. Openarchitecture, usinginternationally ac-

cepted I/O standards, allows audiothat has already been bit reduced tocompletely bypass the internalsource coding process of the DSP6000. This feature gives the broad-caster the power to avoid an unnec-

�Choice of ISO/ MPEG or ADPCM source coder

�CD quality

�Low coding delay

�Processing friendly

�Preserves peaks

�Multiple encode/ decode capability

essary cascade of algorithms, result-ing in a transmission free fromprocessing artifacts.

Channel CodingEfficient spectrum utilization is aprimary consideration forthe choice of modulationformat. The out-of-bandspectral energy must bewell suppressed to avoidinterference of the digitalcarrier with existinganalog services. Linearmodulation formats suchas QPSK or QAM willregenerate sidebandenergy when confrontedwith non-linear Class-C amplifica-tion found in conventional FMSTLs, thereby limiting their useful-ness. In contrast, the DSP 6000uses a form of Continuous-PhaseFrequency Shift Keying (CPFSK),known as partial response. CPFSKis a broad class of digital frequencymodulation particularly well suitedto FM transmission with non-linearamplification.Along with high and user-selectablespectral efficiency, CPFSK signaling

has good error performance andspeed tolerance. Anotherbenefit of partial responseCPFSK signaling is that errordetection can be rapidly ob-tained without adding redun-dancies into the data stream.

�Spectrum efficient

�Constant envelope

�Error detection

�Robust

�Selectable efficiency

System ComponentsHE DSP 6000 Digital Trans-mission System consists ofthe DSP 6000E Encoder, the

DSP 6000D Decoder and anyMoseley digital-ready STL transmit-ter and receiver. The DSP 6000Eand DSP 6000D can also be usedwith other FM radios and/or digitalcircuits. Moseley transmitters andreceivers are available in a numberof bands in the 140 MHz to 1900MHz frequency range.

DSP 6000 EncoderThe DSP 6000 accepts up to fouraudio program channels throughactive balanced inputs via XLRconnectors. Each input, program-mable for 7.5 or 15 kHz band-widths, is routed to a source en-coder. The encoder first converts itto 16-bit linear PCM data with a 64-times oversampling A/D convertercapable of 95 dB dynamic range.Alternatively, the source encoderalso accepts either AES/EBUformatted data or 16-bit linear PCMdirect from a digital source. Thedigitized audio is then passedthrough a user-defined choice ofISO/MPEG source encoder or thesub-band ADPCM encoder.The source encoder output feedsthe channel encoder. The channelencoder will also accept data froman external source from 64 kbps to512 kbps. This facilitates transmis-sion of other services such as basicrate ISDN or Musicam encodedmaterial.Next, the encoded material isrouted through the channel

encoder�s scrambler to preventdiscrete spectral lines from interfer-ing with adjacent channels. Thedata is precoded to prevent errorpropagation in the receiver due tocorrelative properties of eachreceived bit.Finally, a raised cosine low-passfilter Nyquist-shapes the data tominimize inter-symbol interference.The shaped data at the channelencoder�s output drives the STLtransmitter.

DSP 6000 DecoderThe recovered baseband signal fromthe STL receiver is first noiseaveraged by a raised cosine shapedlow-pass filter in the channeldecoder. From the recovered tri-level baseband signal, both bit clockand data recovery are accomplished.The bit clock synchronizes the restof the system to the recovered data.Bit-by-bit detection is performed onthe filtered baseband signal using adigital sample-and-hold. Followingdata sampling, decode logic recon-structs and descrambles the data foroutput to the digital source de-coder. The channel decoder alsoprovides bit-error and BER thresh-old detection for signal qualityindication.The recovered data is fed to thesource decoder which performs theinverse function of the sourceencoder. Sixteen-bit linear PCM isoutput as either formatted AES/EBU or unformatted serial data.Analog output is also available byuse of a 4-times over-sampling D/Aconverter.

T

The DSP 6000source andchannel encoderfully configuredwith four audioand two datachannels.AES/EBUstereo 16-bitPCM data inputfor direct digitalinterface.

The DSP 6000channel andsource decoderswith four audioand two datachannels.Comprehensivebit-error ratemonitoring.AES/EBUoutput for directdigital interface.

Built-in RS-422 driverfor digital telco circuits

Integrated constructioneliminates harnessing toenhance reliability

Dip switches facilitate fieldexpansion, reconfigurationand bit error rate thresholdselection

Extensive Status Monitoring

Configurable for up to four audiochannels (two stereo pairs)per STL system

Plug-in choice of source codersub-band ADPCM or ISO/MPEG

Use of field programmable gatearray reduces circuit density,enhances reliability and facilitatesfield upgrades

The Future Sounds Goodith so many audio choicesavailable to the consumer,radio broadcasting�s future

is increasingly dependent onreaching target audiences with CD-quality audio. As a vital link in thebroadcast chain, the DSP 6000digital STL system allows theprogressive radio broadcaster theability to maintain the digital audiosound he�s worked so hard todevelop at the studio and to conveyit digitally to the transmissionfacility.

Open ArchitectureThe use of international standarddigital I/Os allows the DSP 6000 toutilize other digital hardware andsource material. This commitmentto open architecture gives you thepower to make appropriate choices,and to make these solutions workwith both your existing and futureinvestments.

Fractional T1A built-in V.35/RS-422 interfaceopens the way for utilizing the DSP6000 with digital circuits leasedfrom the telephone company. Thelimited number of RF channels inthe STL band, coupled with theneed for a digital link to the trans-mitter, has forced some broadcast-ers to use digital circuits as analternative to a traditional RF STL.Use of digital circuits (Full T1 or

Fractional T1) entails a monthlypayment dependent on the numberof time slots used for the transmis-sion. The DSP 6000 uses only aquarter of the number of time slotsused by conventional digital sys-tems. A lower data rate offerssubstantial savings over leased linecosts.

Digital RepeatersAt a midpoint in a repeater configu-ration, the DSP 6000 permitsdigital regeneration and/or audioto be dropped off and inserted.Digital regeneration allows multiplehop STLs to be free of the audiodegradation normally associatedwith analog signal regeneration.Creating a cost-effective digitalnetwork with multiple program andtransmission points is now possible.

The Digital Transmission ChainWith the ability to digitally link allkey elements of the broadcastchain, the DSP 6000 is the drivingforce toward the culmination of anall-digital radio station. The latestin digital audio processing can beused with the DSP 6000, either atthe transmitter or the studio. Byeliminating traditional audioprocessing problems like overshootand lack of peak level preservation,the digital radio station has theadvantage�the ultimate advantage.

W

OpenArchitecture

Fractional T1

DigitalRepeaters

The DigitalTransmissionChain

Redefining Transmitters& Receivers

he frequency-agile PCL 6020 andPCL 6030 STLs are ideal RF com-panions to use with the DSP 6000

Encoder and Decoder. Built to withstandthe harshest RF environments and avail-able in frequencies from 145 MHz to 1.9GHz, they have become the choice ofbroadcasters worldwide.As the leaders in STL technology for 30years, Moseley has engineered the PCL

6000 Series to offerunique and innovativefeatures. Both thePCL 6010 transmitterand the PCL 6020 and6030 receivers use asynthesized referenceoscillator, therebyeliminating fixed-frequency crystals.The physical modulecount on the PCL6000 Series is kept to aminimum for highestMTBF without com-prising ease of opera-tion or maintenance.All oscillators, up-converters, discrimina-tors and audio sectionsare individually iso-lated by jumpers for

alignment or repair.

PCL 6010 TransmitterThe PCL 6010 uses direct modulationtechniques. A synthesized reference oscilla-tor is used for FM generation. Conversionof the FM-modulated oscillator frequencyto the final output frequency is done via anup-converter/mixer technique instead ofthe usual frequency multiplication. Forlong STL paths, an external 40 Wattamplifier is available.

PCL 6020 ReceiverThe dual-conversion PCL 6020 Receiveruses an FM quadrature detector toprovide your system with maximumfidelity. Excellent selectivity characteris-tics ignore adjacent channels in yourarea. The receiver IF bandwidth can beset for channel spacing of 100 kHz to500 kHz, depending on RF congestion inyour area and channel availability.

PCL 6030 ReceiverThe triple-conversion PCL 6030 Receiveruses a digital pulse-countingdescriminator for extremely low distor-tion and low noise characteristics. Supe-rior selectivity characteristics ignoreadjacent channels 25 dB stronger thanyour received signal. An optional PCL6060 front-end module with high selec-tivity and adjustable gain preamp isrecommended for front-end protection atcellular telephone sites.

T

� User programmable

� Frequency agile

� Excellent selectivity

� Switchable monaural/

composit/digital

operation

� Comprehensive

metering

�Built-in receiver

transfer circuitry

�145 MHz to 1.9 GHz

� 100-500 kHz

channel spacing

esnopseRycneuqerFediWniaM

worraNniaMediWxuA

worraNxuA

.Bd2.0±zHk51otzH02.Bd2.0±zHk5.7otzH02.Bd2.0±zHk51otzH02.Bd2.0±zHk5.7otzH02

noitrotsiD .zHk1ta%10.<

egnaRcimanyD redocedcitatsBd09,redocnecitatsBd09

klatssorClennahC Bd08-

ytilibatSleveL Bd2.0<

dohteMgnidoCataD .MCPDAdnarb-busroGEPM/OSIfoeciohC

etaRelpmaS zHk84,zHk1.44,zHk23

yaleDemiT .GEPM/OSIsm94,MCPDAsm8.3<

ytinummIrorrEtiB 01> 4- .ytilauqoiduanissolevitcejbusonrof

ytivitisneS 01tamBd39- 4- ,)spbk652ta0006LCP(REB.zH/spb1ta7.0=h,mBd79-;5.0=h

niaGmetsyS tarettimsnarT0106LCPhtiwBd231074-041taBd331.zHM069-098,spbk652

*.zH/spb1tazHM

ycneiciffElartcepS tcatnoc,ycneicifferehgih(,.dtszH/spb1)yrotcaf

slennahCataD1ataD

)lanoitpo(2ataD

,0084morfsetarduabelbatceles,232-SR.duab003,0021,0042

,0069morfsetarduabelbatceles,232-SR.duab003,0021,0042,0084

slennahCmargorP saelbammargorpslennahC.slennahc4-1rofzHk5.7/51dnaniaMrofzHk5.7/51

.dradnatsslennahczHk51owT.xuA

setaRnoissimsnarT ,143,372,652,502,821,46morfelbatceleSlennahcnognidnepedspbk215dna,014

.noitarugifnoc

stnemeriuqeRrewoP .zH06/05,%01±caV032/511

SpecificationsSystem Transmitter and Receiver

FM Radio Requirements

Specifications subject to change without notice.

* System gain 7 dB less for 2 bps/Hz and 14 dB for 3 bps/Hz.

htdiwdnaBmargorPBd3

zH4/R>otzH01<.etarnoissimsnartatad=Rerehw

noitairaVedutilpmA .revieceRdnarettimsnarTBd1<

noitairaVyaleDpuorG .revieceRsµ2<,rettimsnarTsµ1<

DMIdnaDHT .revieceRdnarettimsnarTBd%3<

oitaResioN-ot-langiS .revieceRBd05>,rettimsnarTBd03>

/tupnImargorPecnadepmItuptuO

.revieceRmho001<,rettimsnarTmhok1>

noitaiveD metsysnognidnepedzHk215otzHk46.noitarugifnoc

ytilibatSycneuqerF .noitacilppanosdnepeD

dnasuoirupSnoissimEcinomraH

.noitacilppanosdnepeD

LTS LCPyelesoMydaer-latigidarehtiefoeciohCdnarettimsnartLTS606LCPro0006

.reviecer

egnaRycneuqerF 069-098,074-044,033-003,042-002,671-041.zHG7.1-5.1,zHM

ecruoSrewoP .sttaw001zH06/05,%01±,caV042/021.)yrotcaftcatnoc(cdV42/21

tuptuOFRzHM009-098zHM074-041

.muminimsttaw5,mumixamsttaw01.muminimsttaw7,mumixamsttaw51

rotcennoCtuptuOFR .mho05,elamefNepyT

ytilibatSycneuqerF .C°05+otC°0,%52000.0nahtretteB

dnasuoirupSnoissimmEcinomraH

.levelreirracwolebBd06nahteroM

ytilibapaCnoitaludoM .denibmocro,latigid,golanA

rotcennoCtupnIFR .mho05,elamefNepyT

ytivitisneS .scepsmetsyseeS

gnicapSlennahC nosdnepeD.zHk005-001deificepsresU.etaratad

lennahCtnecajdA)zHk005(noitcejeR

.cBd53latigidotlatigiD.cBd02golanaotlatigiD.cBd03latigidotgolanA

DSP 6000E Encoder

Digital CircuitsDigital Stereo Generator Option

DSP 6000D Decoder

AMoseley Associates Incorporated � 111 Castilian Drive � Santa Barbara, CA 93117-3093 � Phone (805) 968-9621 � Fax (805) 685-9638 � Web http://www.moseleysb.com

tupnIoiduA RLX,tupnidecnalabyllacinortcelE.Bd06>RRMC.elamef,epyt

leveLoiduA otuBd01-morfelbatsujdalennahchcaE.elbisseccalenapraer,nrut-itlum,uBd81+

tupnIoiduAlatigiD remrofsnartA224-SR,dradnatsUBE/SEAtupnismho011,epytRLXdecnalab

.spbk23etarelpmaS.ecnadepmi

redoCecruoStuptuOlatigiD

224-SR

2&1stupnIataD .elamef,epyt-Dnip-9,232-SR

tupnIecafretnI tupnI.elamef,epyt-Dnip-51,224-SRmorfkcolcdnaataddetarenegerrofroF.EDOMRTPRniredocedatadMCPtib-61raenildettamrofnu

.EDOMMCPnicnysemarfdna

tuptuOsutatS wol-evitcasedivorpelamefepyt-Dnip-51,tluafkcolc,tluafmetsysfonoitacidni,tluafxum,tluafrossecorp,tluafmedomlennahcATADdna,tluafUBE/SEA

.tluaf

srotacidnIyalpsiDhpargraB

kaepsetacidniyalpsidDEL-netlauDelacslluf%001otevitalerlevelmargorprofleveldaolrevotupniD/A)Bd0(yalpsiD.slennahcmargorpoiduaotmargorpNIAMmorfelbahctiws

.slennahcmargorpYRAILLIXUA

niaM niamgniyalpsidsihpargrabsetacidnI.slevelmargorpthgiR/tfeL

xuA gniyalpsidsihpargrabsetacidnI.slevelmargorp2xuA/1xuAyraillixua

UBE/SEA .tupnioidualatigidfosutatssetacidnI

tluaF .mralatluafmetsyS

stnemeriuqeRrewoP .W03,zH06/05@caV032/511

tuptuOoiduA .elam,epytRLX,tupnidecnalabyllacinortcelE

leveLoiduA 41+otuBd01-morfelbatsujdalennahchcaE.elbisseccalenapraer,nrut-itlum,uBd

2&1stupnIataD .elamef,epyt-Dnip-9,232-SR

/oiduAlatigiDstupuOecafretnI

roftuptuO.elamef,epyt-Dnip-51,224-SRni)redocneot(kcolcdnaataddetarenegertib-61raenildettamrofnuroF.EDOMRTPR.EDOMMCPnicnysemarfdnaatadMCP

224-SR.oidualatigidUBE/SEAroftuptuO.epytRLXdecnalabremrofsnart

tuptuOsutatS wol-evitcasedivorpelamefepyt-Dnip-51-fo-ssol,cnys-atad-fo-ssol,tluafmetsysfonoitacidni,tluafrossecorp,tluafmedom,tluafkcolc,langisyaleretum,sutatsetum,tluafxumeD,tluafREB

.tupnielbasidetumdna,stcatnoc

srotacidnIhpargraB

margorpkaepsetacidniyalpsidDEL-netlauDA/D)Bd0(elacslluf%001otevitalerlevel.slennahcmargorpoiduarofleveltuptuo

otmargorpNIAMmorfelbahctiwsyalpsiD.slennahcmargorpYRAILLIXUA

tluaF .mralatluafmetsyS

niaM niamgniyalpsidsihpargrabsetacidnI.slevelmargorpthgiR/tfeL

xuA yraillixuagniyalpsidsihpargrabsetacidnI.slevelmargorp2xuA/1xuA

cnyS .noitazinorhcnysatadrofnoitacidnirolociB

langiS .langisdnabesabgnimocnirofnoitacidnirolociB

rorrEataD .rorreataddeviecersetacidnI

REB deviecernehwnoitidnocmralasetacidnIelbatceles(levelteserpsdeecxeetarrorretib

01morf 1- 01ot 6- .)

rewoPstnemeriuqeR

.W03,zH06/05@caV032/511

1-TPEC/1TlanoitcarFetaRataD

.zHk51/spbk821,zHk5.7/spbk46.ylnoslennahc4ro,2,1foeciohC

ecafretnIlatigiD 035AIE/224-SR

1TlanoitcarFUSC

otserehdatahtUSC1TlanoitcarfynA)FSEtuohtiwrohtiw(tamrofknurt1Teht.krowten1TehtsseccaotdesuebnacgnituorrofdesuebnacsUSCtropitluM

.slennahctnereffid

noitarapeSlennahC .)zHk51-zH03(Bd07>

RNS .lacipytBd09-

noitrotsiD .%30.0

leveLtuptuO .decnalabnukaepotkaepV5.3

These specifications are subject to change without notice.