SYMPHONIE
Dual-Channel Real-Time Acquisition Unit
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A SYMPHONIE system performs signal acquisition, on one or two input channels with a 18-bit resolution, directly on to the computer hard disk via a PCcard interface. The application software can select the sampling frequency (up to 51.2 kHz). The application software located on the PC controls all acquisition and processing functions.
SYMPHONIE is a versatile unit with features that meet all the current standards. Data acquisition and calculation of Leq and Peak values conform to IEC 804 and IEC 651 type I specifications, while real time analysis available on both input channels in octave or third octave spectra, from 20 Hz to 20 kHz conform to IEC1260 Type 0 specifications for digital filtering. Frequency weighting filters A, B, C and G are available and simultaneous recording of the input signal to the hard disk is a particular feature of SYMPHONIE that enables post processing and further analysis. Vibrational frequency weightings according to ISO2631 may also be applied.
The maximum dynamic range of the system is 120 dB. The minimum value a system can measure is dependent on the microphone sensitivity: e.g. for a sensitivity of 50 mV/Pa, the measurement range covers sound pressure levels from 20 to 135 dB. The software controls the input gain by 1 dB steps. The dynamic range for a given input range is greater than or equal to 70 dB -so as to comply with Type 0 specifications of IEC 804 and IEC651 standards. Leq and Peak values are calculated by internal signal processing and the results are sent to the computer.
The SYMPHONIE unit also features replay of audio records on a Microsoft .WAV format. An electrical signal output can be used to playback the audio signal. Simply connect the output to a loudspeaker or a pair of headphones.
The computer directly supplies power to the SYMPHONIE unit through the PCcard interface. The power supply conditions, data transmission synchronisation and overloads are managed by the application software.
The SYMPHONIE unit also features overload indicators (two LED's - one per channel).
Last but not least, SYMPHONIE supply power to any type of transducer such as pre-polarised microphones, 200 V polarised condenser microphones, force transducers or ICP® accelerometers.
SPECIFICATIONS
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GENERAL CHARACTERISTICS |
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| Connection | To the computer, interface PC CARD Type II (PCMCIA) |
| Power supply | From the computer |
| Dimensions | 85 x 35 x 220 mm |
| Weight | 560 grams (1.1 lb.) |
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ANALOGUE SECTION |
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Inputs |
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| Impedance | 1 Megohm |
| Coupling | DC or AC |
| Connections | Two 7 pin LEMO connectors |
| Conditioning | Microphone preamplifier (28V-10mA) Condenser microphone (0 or 200V) ICP accelerometer (4.3 mA) Direct input for voltage signals |
| Tacho | Tachometer (accuracy 0.02%) / TTL external input |
| Max. voltage | Peak to peak : 20V, Overload protection |
| Phase match | < 0.1° if ch. 1 gain = ch. 2 gain < 0.5° if ch. 1 gain <> ch. 2 gain |
| Filters | High pass filter from 0 to 10 Hz |
| Noise floor | Electrical : 5 dB(A) |
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A/D conversion |
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| Resolution | 18 bits sigma/delta. |
| Sampling | 51.2kHz max. Oversampling factor of 64 |
| Anti aliasing | Butterworth, 120dB/octave |
| Offset | Automatic adjustment |
| Overmodulation | Indicated |
| Signal/Noise | > 90dB per range |
| Amplification | Up to 65dB in steps of 1dB |
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Outputs |
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| Type | Parallel during acquisition |
| Sampling | From 100 Hz to 51.2 kHz |
| Connections | One 4 pin LEMO connector |
| D/A converter | Dual channel 18 bit at 51.2kHz Sigma delta digital/analogue Synchronous recomposition per channel |
| Max. voltage | Peak to peak: 5V |
| Other | Insert voltage for calibration reference |
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DIGITAL SECTION |
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| Connections | Two input and two output channels |
| Processors | Double TMS320C31 + 1 TMS320C203 |
| Performance | 100 MFLOPS |
| Words | 32 bit coding |
| SRAM | 128K x 32 bits |
| RAM | Dual port 48K x 8 bits |
| Connector | Mini Din ( ps/2 ) |
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Analyser mode (dBFA32) |
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| Functions | Spectra acquisition and analysis (narrow and broad bands) Signal acquisition and signal edition |
| Freq. analysis | Spectra in octaves and third octaves by digital filtering from 20 Hz up to 20 kHz in real-time |
| FFT analysis | Autospectra and cross-spectra (1 pass and 2 passes) |
| Time acquisition | Up to 20 kHz (on two channels) |
| Trigger | Manual, automatic or by remote control |
| Generator | Pink noise, white noise, sinus, loop |
| Results | Factor 2 to 128 |
| Trigger | Storage, print, copy/paste, exportation, etc. |
| Options | Psychoacoustics module, transient analysis module, sound intensity and sound power (ISO9614) modules, signal edition, tacho recordings, MATLAB objects |
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Sound level meter mode (dBTRIG32) |
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| Functions | Lp, Leq, Peak, Slow, Fast, Impulse |
| Freq. analysis | Spectra in octaves and third octaves by digital filtering from 20 Hz up to 20 kHz in real-time |
| Audio | Acquisition up to 20kHz |
| Weightings | A, B, C, G, Lin |
| Time base | Down to 20 ms in real-time, down to 1 ms in post-processing |
| Options | Dual-channel acquisition, 115dB maximum dynamic range Digital filtering from 0.5 Hz to 20 kHz and overall vibration levels according to ISO2631, frequency analysis down to 1/48th octaves Psychoacoustics (PNL, PNLT, in real-time), expert mode |
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Building acoustics mode (dBBATI32) |
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| Functions | Spectra acquisition, measurements and analysis of reverberation times, computation of sound insulation (ISO717) |
| Freq. analysis | Spectra in octaves and third octaves by digital filtering from 20 Hz up to 20 kHz in real-time |
| Time base | Down to 20 ms in real-time, down to 1 ms in post-processing |
| Generator | Pink and white noise |
| Options | MLS signal generator, room criteria (RASTI, etc.) |
PICTURE
