Especificaciones Técnicas
Technical Specifications
Universal Audio Processor 542 APC
Haga click aquí para ver un artículo teórico (paper) en castellano acerca de la Teoría de los procesadores de audio y su relación
con el aumento del alcance de una emisora de FM Estéreo. Este trabajo es una traducción del original publicado en inglés en el Journal of the Audio Engineering Society, Ing Oscar Bonello, AES Fellow, March 2007 ( se obtiene en www.aes.org)
Specifications
Measured from balanced XLR inputs to XLR outputs
And from digital AES-3 input to AES-3 output
All DSP processing is at 48 kHz, 24 bits
Model 542/AoIP has Ethernet input/output at 48 Kz / 24 bits
Inputs
1-XLR3 conector, 600 ohms balanced, Nominal level + 4 dBu. Max level + 24 dBu, Software adjusted
2-RJ45 stereo balanced (compatible with StudioHUB) Nominal level -10 dBu to + 24 dBu, 600 ohms balanced
3- Digital AES/ EBU input transformer balanced ) Nominal level -18 dBFS Adjust from -24 to 0 dBFS
4-Optional digital stereo AoIP option for LAN Ethernet or Internet input
RF Input: Digital Receiver for use as FM Monitor and Audio Analyzer
VOICE/ MUSIC change: GPI Input = + 5V … +15V for VOICE mode preset (On-Air microphones)
Voice/Music switch received from console in AoIP models
Switching between all Music Style Program settings using RDS data from studio.
Outputs
1-Analog Balanced, XLR connector+ 4 dBu; Z= 600, Max + 18 dBu, Flat frequency response
2- Analog unbalanced RJ45 output (compatible with StudioHUB), + 4 dBu / 600 ohms
3- Digital AES/ EBU, transformer balanced ) 0 VU at -12 dBFS
4 & 5 – MPX-1 & MPX-2 for FM transmitters (Normal & Emergency) 0 – 5,5 Vpp
Independent level software controlled, Z = 50 ohms
Differential output, BNC connector, floating ground 50 ohms
Allows 45 dB canceling buzz & noise due to ground loops
Protected for electrical storms 2 KV overload
Optional AoIP processed digital output in /AoIP models. It allows for direct audio streaming or for
AoIP connection between different studios at the Radio / TV station.
IN/OUT Control
Remote control by software of the Input – Output matrix
Remote control by software of the Input – Output matrixAutomatic programable transfer from one input
to another when audio fail is detected
Frequency
Response
ANALOG BAL = 20 – 16.000 Hz +/- 0,3 dB
AES to AES = 20 – 16.000 Hz +/- 0,3 dB
measured below compression & limiter threshold
Harmonic Distortion and DELAY
ANALOG BAL = Below 0,005 % @ 1 kHz
AES to AES = Below 0,002 %
Delay: 3 – 9 ms depending on preset used
Dynamic
Range
ANALOG BAL to ANALOG BAL > 95 dBA
AES to AES > 110 dBA
Stereo
Separation
> 80 dBA
Subsonic Filter
Chebyshev 4th order, Selectable: OFF – 15 Hz – 20 Hz
Asymmetry
Cancelling
5:1 cancelling reduction, using Khann-Bonello system
Expander
5 bands low level expander
AGC
One Wide-band AGC and 5 bands AGC (Leveller)
Multiband
Compressors
FIVE or more bands depending of software version used
Standard model of 5 bands includes: 5 x AGC (Levellers); 5 x Compressors; 5 x Limiters; 5 x Clippers
Linear Phase crossover
Full software control of all parameters
12 – 16 factory presets programs
Effects
Super BASS effect and Stereo Enhancer is standard in all software versiones
Linear limiters with predictive technology (Look Ahead) gives the audience a full clean sound
Pre-Processing
Equalizer
Full Parametric EQ with four bands . Each band with 2order passband filter with:
a) Level control; b) Frequency control; c) Q factor control (bandwidth)
Proccesing
Number of bands and stages, features, etc are dependent on software version used
It can work in FM, AM, HD, TV & Streaming modes
Standard 542APC works in Five bands FM mode 0-50-75 uS
RF Interference Rejection
The processor can operate at RF field values up to 150 dB/uV
This value exceeds the international FCC, USA OET-65 life safety recommendation of 27.5 V/m for 30 minute exposure.
Power
115 V / 230 V (rear switch selected) 50/60 Hz, 20 W
Dimensions
19″ rack mount. Module one (44,4 mm) // weight 3 Kg Net; (4 Kg for courier freight)
DSP STEREO CODER
MPX output
Two MPX outputs with individual remote level control by LAN or Internet
Differential output, BNC connector, floating ground 50 ohms. Allows 45 dB canceling
buzz & noise due to ground loops
Level of each output adjustable from 0 to 5,5 Vpp
Frequency
Response
20-15.000 +/- 0,2 dB,
plus 16 Khz/linear phase filter
Attenuation at 19 Khz > 80 dB
Harmonic
Distortion
From 30-12.000 Hz, below 0,01 %
Measured using Belar Digital Stereo decoder DSD-1A and Spectrum Analyzer
Signal to Noise
Ratio
Better than 85 dBA with reference to 100% modulation
Measured using Belar Digital Stereo decoder model DSD-1A
Stereo
Separation
> 65 dB at 1 Khz
38 Khz suppression
Below – 80 dB Ref 100% modulation
57, 76 & 95 Khz
suppression
Below – 80 dB Ref 100% modulation
Pilot tone
stability
+/- 0,002 % (+/- 0,5 Hz)
RDS ENCODER
RDS/RBDS signal
Conforms to CENELEC EN50067 / EN 62106 /
Control interface based on ASCII commands and UECP protocol
Built-in weekly scheduling
RDS signal bandwidth
+/- 2.4 kHz (50 dBc)
Spurious suppression
>90 dB
Harmonics suppression
>80 dB
Clock reference
Pilot Tone
19 kHz pilot PLL lock bandwidth
+/- 2Hz
Data connector: Ethernet input
RJ45 connector for TCP/IP LAN Ethernet
Text features include dynamic PS, parsing, scrolling, fixed messages,
scheduling and reading from HTTP
Data Port Speed
2400 – 9600 bps
Supported services
PI Program Identification, M/S Music/Speech, PS Program Service, PIN Program-Item Number, PTY Program Type, ECC Extended Country Code, TP Traffic Program, RT Radiotext, AF Alternative Frequencies, TDC Transparent Data Channels TA Traffic Announcement, IH In House Applications, PTYN Program Type Name, ODA Open Data Applications, DI Decoder Identification, CT Clock-Time and Date, EON Enhanced Other Networks information
FM Modulation Monitor & Analyzer
Data Display
All information is remotely read from studios or from any place in the world. You can use standard PCs, Tablets or even cell phones. Usually the first time 542 is on Air Solidyne reads from factory all 24 transmission parameters and adjust Modulation, Pilot tone, RDS signal, Stereo Separation and improves the lack of good separation due to SWR at antenna, coaxial cable and transmitter
On Air Measures during normal program
The 542 can do all the measures, including channel separation, audio distortion THD and background noise during the normal program of the radio station because it is not noticed by the audience
Using a exclusive proprietary technology it works sending to the air very short (few milliseconds) test signals mixed with the voice or music of the program. The digital receiver of the 542 analyzes this brief information in order to convert it to valuable data
Parameters measured
Percentage of FM modulation in real peak, Carrier frequency, Percentage of 19 kHz pilot tone, Percentage of RDS subcarrier, RF level input (dBuV), Multipath (%), L & R Audio level, L & R Stereo channel separation (dB), Transmitter and aerial harmonic distortion (THD at 1 KHz), Carrier offset, Ultrasonic Noise (dB Ref carrier), SR at 200 KHz offset from carrier, High and Low side SR at 100 kHz deviation, RDS bit error %, RDS data RT, PS,PTY,PI
Full transmission parameters chart
All transmission parameters data is recorded at a TXT file that can be sent by mail to the engineering department or to the government control authority as a proof of the good transmission quality. Even small damages of coaxial cable or antenna dipoles after storms are detected by the reduction of stereo channel separation.
Radiated Power Chart
The range of a FM radio stations depend on the effective radiated power of the transmitter. The Modulation Analyzer creates continuously a chart of the radiated power. It can be seen at the PC that controls the 542.
Using this unit in European countries it complies with ITU BS 412 standard of reduced RMS power to avoid interference with near frequency FM stations
Automatic mailing of troubles
The 542 internal FM modulation monitor can be settled to send to the station manager or engineer a mail to their PC or Cell Phone in order to inform them about over modulation or 3 sec silence
You will ever be sure about the correct performance of your FM station