RIZ DRM Compact Solution

Transcription

1 The RIZ DRM Compact Solution offers total solution in digitalization of AM broadcasting. It is applicable not only at the new generation of digital ready transmitters but also to the existing analogue AM transmitters of any producer, enabling them broadcasting of digital signal. Solution incorporates units whose sophisticated features and flexibilities make it unique and useful for every broadcaster. RIZ DRM Compact Solution MAIN FEATURES: State of the art architecture based on Microprocessor and DSP technology Remote control Redundant watchdog circuits insuring high uptime Easy software upgrades for future development of DRM Wide range of adjustment possibilities for use with different types of AM transmitters User friendly interactive multi-windowing menus Compliant to ETSI TS DRM System Specification RIZ DRM Compact Solution

2 RIZ-Transmitters Co. has recognized importance of revitalization in AM broadcasting below 30MHz (Long Wave, Medium Wave and Short Wave) and joined DRM organization with intention to support and implement all up to now determined DRM System Specifications There is a global trend towards the adoption of digital technology in radio and communications, because of many substantial advantages to national and international broadcasters and info casters. DRM uses existing frequencies and bandwidth and provides near-fm quality sound and excellent reception. Problems with fading, noise and interference belong now to the past. Implementing different digital code protections, coverage area is significantly increased. Additionally, DRM offers other advantages. It can integrate audio with data and text, so additional content can be transmitted. Also, up to four (4) audio channels can be transmitted over one existing frequency channel RIZ DRM Compact Solution results from hard engineering, offering sophisticated features and flexibilities that make it unique and useful for every broadcaster. It can be used with any RIZ DRM SW, MW or MW Transmitter, or with many existing transmitters which can be easily modified to carry DRM signals. RIZ DRM Compact Solution Sub-systems: RIZ DRM Audio Content Server RIZ DRM RF Digital Synthesizer Pre-correction module GPS clock reference RIZ DRM Remote Control 2

3 PC CONTENT SERVER RIZ DRM Content Server is designed in compliance with ETSI TS v ( ) DRM system specification. It convert input analog or digital (AES/EBU, S/PDIF) audio signals into DRM multiplex in real time and makes it ready for further processing. Signal processing is based on symmetric multiprocessor system with two 2.4 GHz Intel XEON and Windows 2000 OS. Independent watchdog circuits insure reliable operation and high uptime All configuration parameters can be selected and managed by mouse-click on the dedicated window, like in standard windows applications. Content server functions: Audio source encoding (AAC, AAC+SBR, HVXC, CELP) FAC and SDC generation Configuration of the multiplexer with up to four main services Complete frequency domain symbol/cell generation Communication interface between distribution centrums and transmitter (long distance control, by IP connection) PC Content Server supports the following DRM features: RIZ DRM Content Server Software Architecture Schematic Nominal Bandwidth (9/10kHz) Half Bandwidth (4.5/5kHz) Double Bandwidth ( 18/20kHz) 64QAM MSC, all Code Rates 16QAM MSC, all Code Rates 16QAM SDC 4QAM SDC Standard Modulation Hierarchical Modulation Equal Error Protection Unequal Error Protection Long/Short Interleaving Service reconfiguration Channel reconfiguration RIZ DRM Audio Content Server Audio and Source Coding Subsystem Audio IO Core Winsock Connectivity Subsystem DRM Encoding Subsystem Serial IO Core Audio Hardware RIZ DRM Core Windows API Layer WIndows API (HAL) s and OS layer Network Interface Hardware IO Hardware Network Interface Hardware Remote Control Application Windows OS Remote Control Layer to Application Windows Hardware OS RIZ DRM Layer to Layer Remote Control Windows Remote Hardware OS Layer to Monitoring Layer Remote Hardware Application Monitoring Layer RIZ DRM Application Remote Monitoring Multiple Remote Users Audio Source Analog or Digital Up to maximum of 4 stereo audio sources Audio Hardware Winsock Connectivity Subsystem RIZ DRM GUI IO Hardware Synthesizer Control Link DRM Stream Link RIZ DRM RF Digital Synthesizer DDS 1030 DRM Local, On Site, User 3

4 RIZ DRM COMPACT SOLUTION PC AUDIO CONTENT SERVER - SPECIFICATIONS PC Motherboard: CPU: RAM: HDD: Case: Display: Power supply: Server grade MB with Intel E7500 chipset 2 x 2.4GHz Intel XENON, 512kB cache DDRAM 512MB, PC2100, 266MHz, ECC, Registered IDE or SCSI or IDE-RAID or SCSI-RAID 19 inch rack 6U height 12.1 inch TFT LCD built in case 460W, Server grade AUDIO INTERFACE Analog In: Digital In: Digital In: Analog Out: Digital Out: Digital Out: Audio resolution: SNR: Sampling rate: Dimensions: PCI card with external ADC/DAC and audio connectors 4xStereo XLR balanced 1xAES/EBU or SPDIF 1xADAT 4xStereo XLR balanced 1xAES/EBU or SPDIF 1xADAT 24 bit A/D and D/A conversion >90dB up to 48 khz 19 inch 1U height rack RIZ DRM RF DIGITAL SYNTHESIZER RIZ DRM AUDIO CONTENT SERVER AUDIO INPUT BOARD KEYBOARD UPS 4

5 PC CONTENT SERVER - SERVICE PARAMETERS MENU PC CONTENT SERVER - AUDIO STREAM PARAMETERS MENU 5

6 RF Digital Synthesizer DDS 1030 DRM RF Digital Synthesizer, Type RIZ DDS 1030 DRM is primary intended as an exciter for all AM radio broadcasting transmitters in DRM, DSB and SSB mode of operation respectively, within frequency rage 10kHz to 30MHz. It utilizes DDS (Direct Digital Synthesis) providing outstanding spectral and operational performances. RF output is generated directly by 14-bit digital to analogue converter. High frequency stability and extremely low phase noise resulted from its internal frequency reference OCXO (Oven Controlled Crystal Oscillator) and optional external GPS reference. RF Digital Synthesizer, RIZ DDS 1030 DRM, is equipped with RS 422, RS 485, CAN remote control interfaces and is fully digitally controlled over RS 422 and RS 485, control port. In DRM mode of operation synthesizer processing OFDM input constellation. Transition from frequency to time domain is achieved by 32 bit Sharc DSP. RIZ DDS 1030 DRM, offers flexibility with digital input base band complex I/Q signals, high-speed direct-digital synthesizer, high-performance 14 bit digital to analogue converter (DAC), digital filters and other DSP functions. The large graphical display on the front panel gives complete on-line information about DRM signal parameters. In case remote mode is disabled, the keyboard on front panel allows quick manual parameter setting. FEATURES: Frequency range 10kHz to 30MHz DDS ( Direct Digital Synthesis) Extensive remote control facilities Outstanding spectral and operational performances 6

7 TECHNICAL DATA Type of Synthesis: Operation Modes: Direct Digital Synthesis (DDS) DRM, DSB, SSB, Inputs Ext.Frequency Reference: External AF: Digital I, Q: 10MHz, 20MHz, (3dbm, 50 ohm, BNC) Optical (digital sampling rate 96 khz) Analog (20Hz to 10 khz, 600 ohm balanced, XLR3) Optical RS 422, CAN Outputs RF Output: 10 khz to 30MHz, adjustable in 1Hz step RF Output Level: dBm, 50ohms Phase or phase and amplitude modulated, BNC AF Envelope: Optical (sampling rate 192 khz) Analog (0Hz to 90 khz), 600 ohm balanced, XLR3 Phase Noise Performances 10 Hz: -90 dbc 100 Hz: -110 dbc 1 khz: -135 dbc 10 khz: -140 dbc Frequency Stability: 1x10-8 per year OCXO MHz Interfaces: RS422 RS485 RS232 CAN 2.0 AES/EBU Temperature Operating: C Storage: C Power Supply: 230 to 260 VAC single phase, 50Hz Dimensions: 19 rack mounts, H=2U 7

8 PRE-CORRECTION RECEIVER Receiver takes transmitters RF output sample signal, down-convert it to MF (12 khz) in order to get spectrum suitable for digital processing of OFDM signal on PC. Output sample signal is processed and compared to input signal in order to obtain pre-correction curve. Pre correction receiver cares also about tuning the delay compensation between amplitude and phase component of DRM signal through transmitters RF and AF stages. GPS REFERENCE In SFN mode external GPS reference ensures a very high frequency stability and extremely low phase noise. RIZ - TRANSMITTERS Co., BoæidareviÊeva 13, Zagreb, Croatia P.O. Box 654, Tel: , Fax: riz@riz.hr, web site: