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SOLIDYNE INOVONICS EELA AUDIO Omnia-Axia-Telos

Nekoliko riječi o Sound ili Broadcast procesorima:

Zvuk koje čuje ljudsko uho ima raspon od oko 15 Hz do 25 KHz. Najče㲶3;e se navodi područje od 15 Hz do 15 KHz e uzima za neku srednju vrijednost uz zadovoljavajuću kvalitetu. Stereo reprodukcija zahtijeva L i R kanal, veliku dinamiku uz zadr桮je eće glasnoće u eteru. Drugi ograničavajući faktor je ⩮a kanala koju moramo zadr䩠u okviru 150 KHz. Samim pojačavanjem audio signala naయstaja postaje glasnija u eteru ali i na㩧nal postaje ⩠od 150 KHz AKONSKI NIJE dozvoljeno, osim toga pre⯫ signal ima manji domet i većina FM prijemnika ga prima sa VELIKIM IZOBLIČENJIMA.

STEREO KODER - uređaj koji L i R kanal sa mix-pulta pretvara u MPX signal i vodi ga u Exciter ili modulator koji ga utiskuje u osnovnu frekvenciju n akojoj radi vaಡdijska postaja npr. 87,5 MHz.

   

 MPX signal se sastori od 3 dijela:

  1. Prvi je normalana audio signal koji nastaje zbrajanjem L i R kanala, ustvari to je signal koji se čuje na običnim mono prijemnicima.
  2. Drugi dio MPX signala je signal razlike L-R kanala i njime se DSBSC (Double sideband suppressed carrier) modulira signal od 38 KHz. Vae napomenuti da je SUBcarrier (podnosioc) Amplitudno Moduliran (AM)
  3. Treći dio je signa od 19 KHz, njegova uloga je da dekoderski sklop u prijemniku prepozna stereo informaciju i regenerira od Mono signala i Signala razlike pravi L i R kanla. Njegov nivo u Mpx signalu je oko 10%. ( Ovaj opis je prilično pojednostavljen ali dobro je znati kakav mi to signal 쪥mo u eter prema na�lu䥬jima).
  4. Formula regeneracije MPX-a u L i R kanal na strani prijemnika izgleda ovako: L+R i  L-R signali se zbrajaju za Ljevi kanal  ((L+R)+(L-R)=2L) i oduzimaju za Desni kanal ((L+R)-(L-R)=2R).
  5. Kodiranje se mo੺vr䩠i preklapanjem L i R kanala u ritmu od 38 KHz no tada nastaje dosta "parazitnih informacija" koje ne 쩭o u eteru.
  6.  

PRE-EMPAHSSIS: Potupak izdizanja visokih frekvencija prije kodiranja, 50 uS za većinu svijeta i 75 uS za SAD

 

SOUND PROCESORI

Osnovni zadatak svakog dobrog procesora je zadr桮je maksimalne glasnoće uz eću dinamiku i originalnu zvučnu sliku, a da pri tome devijacija RF signala radijske postaje ostane u dozvoljenim granicama. Definicija zvuči vrlo jednostavno no u praksi je to sloroces koji zahtijeva skupe i sloelektronske sklopove. Najče㲶3;e tehničko rije je ulazni signal rastaviti na nekoliko frekvencijskih pojaseva, (popularno nazvano bandova), svaki zasebno obraditi i zatim  ponovo spojiti !

Osnovna podijela:  ANALOGNI i  DIGITALNI, svaka generacija ima svoje prednosti i nedostatke, kod prvih signal tokom cijelog procesiranja ostaje u svom izvornom obliku, dok se kod digitalnih uređaja pretvara u digitalnu informaciju koja se obrađuje pomoću sna騠DSP procesora. Bez obzira na veliku snagu i brzinu digitalnih sprava postoje ᦣ269;ajna  kaꥮja koja mogu prdstavljati problem pri radu.  Treba imati na umu da trgovci u praksi slabo poznaju princip rada takvih uređaja pa su moguća i razna neugodna iznenađenja!

 

Model 716 - "DAVID-II" FM Processor/Generator

  • The famous "DAVID-II" FM processor/stereo-gen.
  • "Gain-riding" AGC, compression, limiting and composite clipping.
  • Exceedingly easy to set up and use.

"DAVID-II" combines simple-yet-effective and comprehensive audio processing with a digital-synthesis stereo generator. The result is an FM airchain of surprising performance and exceptional value. Audio processing functions employ quasi-digital pulse-width-modulation (PWM) techniques for stable, adjustment-free operation. "DAVID-II" also has built-in combining for SCA or RDS/RBDS subcarriers. plus an adjustable composite clipper.

Price: $2000 Factory List

 

Model 718 - "DAVID-III" FM Processor/Generator

  • Third-generation DAVID processing. Bigger, bolder, brighter.
  • AGC, multiband compression/limiting, equalization,
    proprietary final limiting and composite clipping.
  • Still the essence of simplicity; easy to set up and use.

"DAVID-III" combines comprehensive multiband audio processing with a digital-synthesis stereo generator for unexcelled performance and great value. Pulse-width-modulation (PWM) techniques ensure rock-stable operation and a very competitive, yet effortless sound. Density and equalization adjustments allow the broadcaster to tailor the 'signature' of the on-air sound. Proprietary PIPP* final limiting and an adjustable composite clipper guarantee full carrier modulation for any program audio source or characteristic.

Price: $2200 Factory List

 

Omega_FM Digital Processor - Stereo Generator

  • All-digital FM-airchain with integrated audio processor
    and stereo-gen.
  • Analog and digital inputs; simultaneous and independent
    MPX (composite) and AES (digital audio) outputs.
  • Simplified user interface.
  • Low latency - monitor off air!

 

Read about what's NEW in Rev3.0 for the Omega_FM. Click Here

Omega_FM is a full-featured FM processor/stereocoder of exceptional value. It does not use application-specific DSP chips, instead it applies Pentium㬡ss computing power directly to all processing and stereo-generating functions. Among the many other advantages, this architecture helps keep Omega_FM obsolescence-proof. Future upgrades are simply software uploads that do not require additional hardware or factory modifications to the unit.

User interface is simple and straightforward. Omega-FM may be used right out of the box with no computer or software commands required. Nevertheless, connecting a PC (or modem) and running the supplied software places almost all processing parameters under local (or remote) user control. Favorite setups may be added to the basic factory presets, creating a group of files that may easily be managed or shared among installations.

Despite its modest price, Omega_FM challenges the versatility and performance of any processor on the market. Click Here to read a Radio World review of the Omega_FM by the Chief Engineer of KZLA in Los Angeles, and click here for a review of the Omega_FM by the British magazine, Line Up.

Price: $5880 Factory List

 


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Last modified: 02/20/15

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