Equipment

The DSP laboratory is equipped with almost all the devices required by signal processing related research, development, and musical sound synthesis. It is a great advantage of the laboratory that the work of students and researchers is supported by instruments not widely spread even in the industry.

One of the most important instruments used at measurement and research is the digital storage oscilloscope by LeCroy. The main functions of the oscilloscope are the following:

• 500 Msample/sec, 500 MHz bandwidth inputs, which are satisfactory for displaying signals appearing at measurement and development tasks;
• Real-time analysis functions for determination of the main parameters of the measured signal (amplitude, RMS value, frequency, rise/fall time, etc.);
• Flexible FFT module (record length, window functions, etc.) for frequency analysis;
• By standard interfaces (RS-232, GPIB) the instrument can be connected to a personal computer, and therefore the measured data can be stored and documented.

Fig. 1. LeCroy LT342 digital storage oscilloscope

Another important instrument of our laboratory is the heterodyne spectrum analyzer by HP. The main functions of the analyzer are the following:

• Measurement can be performed from 20 Hz to 40 MHz, so it can be used for measurement in frequency ranges of instrumentation and audio signal processing, and it is able to measure in the RF range, as well;
• Its 100 dB dynamic range allows high-precision measurements;
• Magnitude response of circuits and systems can be measured using its tracking generator;
• By the standard interface (GPIB) the instrument can be connected to a personal computer, and therefore the measured data can be stored and documented.
  

Fig. 2. Measurement of the magnitude response of an FIR filter by HP 3585B spectrum analyzer

• It is able to measure both magnitude and phase response, thus the complex frequency response of a system can be measured. It can also be used for impedance measurement with some limitations.
• As its frequency range covers the 5 Hz ... 3 GHz range, it is able to analyze circuits both for sensor networks and audio applications.
• The active probe supports high-impedance measurements up to 500 MHz.
• It has 4 measurement channels that can be programmed easily. It is equipped with both BNC and N connectors, so scattering parameters of a network can also be measured.
• The dynamic range is minimum 90 dB.
• Both linear and logarithmic sweeps can be used. The analyzer can also provide DC bias. 
• The display can easily be customized, measurement results can be downloaded in many different ways (e.g., via USB).

   

  

  Fig. 3. The Agilent E5061B network analyzer.

   

  The analysis potential given by the above mentioned instruments is completed by the programmable waveform generator by Agilent. The frequency, amplitude and waveform of the output signal can be set in a very flexible way. Due to the interfaces it is also possible to control the instrument, e.g. for long-time investigations of devices or for arbitrary waveform generation.

   

  Besides the featured instruments there are many general-purpose ones in the laboratory:

   

  • Laboratory power supplies with wide operating range and current limiting for test and development purposes;
  • Multimeters for the measurement of general electric quantities;
  • general-purpose signal generators.

   

  Signal processing algorithms can be implemented by Analog Devices EZ-KIT development boards. These boards can be used for very different tasks:

  • The ADSP-21061, ADSP-21065, ADSP-21364, ADZS-21489 floating-point DSPs are particularly suitable for implementing complex  audio or high-precision measurement and control algorithms;

  • ADZS-SC589-Mini: due to its dual floating point 32 bit SHARC and ARM Cortex-A5 core it is suitable for implementing complex audio or high-precision measurement and control algorithms which require high computational capacity. Due to its Ethernet adapter, it is easy to integrate this processor into modern communication systems.

  • ADZS-SHAUDIO-EZEXT: an extender for ADZS-21489 development board with 24 input and 12 output analog channels. It is suitable for the implementation of multiple-input multiple-output audio and measurement systems.

  • The ADSP-BF533, ADSP-BF537 fixed-point DSPs are in between the classical DSPs and the embedded processors. They can unify the advantageous features of both types. Using these processors one can implement not only signal processing algorithms but other auxiliary tasks. Due to their rich set of peripheries and high clock frequencies the processors can communicate using Ethernet or USB. They are also able to run an operating system.

  • The ADSP-2181 works at low clock frequency, but it is very suitable for the solution of simpler measurement or audio signal processing tasks.

  The above DSP boards with the accompanying software have arrived to the laboratory as the donation of the Analog Devices Inc. The development boards allow us the education of the practice of digital signal processing for a wider range of students. The boards can be utilized in research, as well.
  

   

   

  Fig. 3. ADSP-BF537 development kit	Fig. 4. ADSP-2181 development kit

  
   

   

  Program development can be carried out under Visual DSP++ development system, which allows programming both in assembly and C. Furthermore, handling of an operating system is also supported.

   

  Besides the manufactured DSP kits we have some self-developed DSP and FPGA boards.

   

  There are several tools in the laboratory which can be used for vibroacoustic measurement and analysis. These investigations can be done by our sensors and programmable amplifiers by Brüel & Kjaer. The measured signals can be recorded in real-time using the 8-channel FOSTEX hard disk recorder, which can be also used for audio recording.

   

   

   

  List of the most important measurement instruments:

   

  Oscilloscopes:

  LeCroy	LT342	Digital storage oscilloscope
  Iwatsu	DS-6612	Digital storage oscilloscope
  Tektronix	TDS-320	Digital storage oscilloscope
  Hitachi	V-212	Analog oscilloscope (2 pcs)
  PicoScope	2207A	Digital oscilloscope
  Testec Elektronik	TT-SI 50	50 MHz active differential probe

  
   

  Spectrum analyzer:

  HP

  3585B

  Heterodyne spectrum analyzer

   

  Network analyzer:

  Agilent	5061B	network analyzer
  Agilent	41800A	active measurement probe

  Signal generators:

  Agilent	3322OA	Programmable function generator
  Hameg	HM8030	Function generator (2 pcs)
  Hameg	HM8131	Function generator
  Brüel & Kjaer	1051	Low-distortion sine wave generator
  Philips	PM5192	Programmable function generator
  HP	HOI-3722	Noise generator (2 pcs)

  Other instruments:

  Krohn-Hite	3322	Programable filter
  Hameg	HM7042	Power supply (3 outpouts)
  Hameg	HM8040	Power supply (3 outpouts - 2 pcs)
  Hameg	HM8011	Digital multimeter
  Brüel & Kjaer	Nexus 2693	Programmable amplifier
  Brüel & Kjaer	BK 2638	Conditioning amplifier
  Brüel & Kjaer	BK 2637	Preamplifier
  Brüel & Kjaer	BK 2634	Charge amplifier (4 pcs)
  Brüel & Kjaer	BK 2626	Charge amplifier  (2 pcs)
  Brüel & Kjaer	BK 1613	Octave filter (2 pcs)
  Voltcraft	SL-400	Sound pressure meter

  Development kits:

  Visual DSP++	Development environment	Development of C and ASM programs
  HPPCI-ICE	Emulator	Program downloading and debugging
  HPUSB-ICE	Emulator	Program downloading and debugging (2 pcs)
  ADZS-ICE-1000 (USB-JTAG)	Emulator	Program downloading and debugging
  ADSP-2181 EZ-KIT Lite	Fixed-point proc. board	Processor, codec, serial port (5 pcs)
  ADSP-21061 EZ-KIT Lite	floating point proc. board	Processor, codec, serial port (2 pcs)
  ADSP-21065 EZ-KIT Lite	floating point proc. board	Processor, codec, serial port, SDRAM
  ADSP-BF533 EZ-KIT Lite	Fixed-point proc. board	Processor, codec, serial port, video
  ADSP-BF537 EZ-KIT Lite	Fixed-point proc. board	Processor, codec, serial port, Ethernet, Can (20 pcs)
  ADSP-21364 EZ-KIT Lite	floating point proc. board	Processor, codec, serial port, SPDIF, SDRAM (6 pcs)
  ADZS-21489	floating point proc. board	Processor, codec, serial port, SPDIF, SDRAM
  ADZS-SC589	floating point triple core proc. board	Dual SHARC processor, ARM core, SDRAM, codec, Ethernet
  ADZS-SHAUDIO-EZEXT	audio extender	24 input and 12 output analog channels
  Berkeley MICAz motes	Sensor network boards	processor, radio module, sensor board (2 set, 8 pcs. each)

   

   

  

   

  Fig. 5. MICAz mote boards

  Audio devices:

   

  Genelec	8040A	Active loudspeakers (1 pair)
  Seas	L26RFX/P	subwoofer (6 pcs)
  Denon	AVR-3802	7-channel power amplifier
  Fostex	D-108	8-channel hard disk recorder
  Cakewalk	UA-101	8-channel USB audio interface
  M-Audio	FastTrack Pro	USB audio/MIDI interface with preamps
  West Sound	DS-150	power amplifier
  Soundart	Chameleon	Freely programmable effect processor
  Alto	AMX-140 FX	14-channel mixer
  Oneway	RTO3	8-channel microphone preamplifier
  Genius	SP-HF1250x	Active loudspeakers (5 pairs)
  Genius	SP-HF160	Active loudspeakers (4 pairs)
  Larson Davis	CAL150	Precision acoustic calibrator

   

  Sensors and actuators:

   

  Brüel & Kjaer	BK 4810	Shaker
  Brüel & Kjaer	BK 4399A	Accelerometer (2 pcs)
  Brüel & Kjaer	BK 4502	Accelerometer
  Brüel & Kjaer	BK 4330	Accelerometer
  Brüel & Kjaer	BK 4384	Accelerometer (3 pcs)
  Brüel & Kjaer	BK 4374	Accelerometer (2 pcs)
  Brüel & Kjaer	BK 4381	Accelerometer
  Brüel & Kjaer	BK 8001	Mechanical impedance head
  Brüel & Kjaer	BK 8200	Force transducer
  Brüel & Kjaer	BK 8230C-003	Force transducer
  Brüel & Kjaer	BK 8202	Impact hammer
  Brüel & Kjaer	BK 2646	Line-drive amplifier (2 pcs)
  Brüel & Kjaer	BK 4189	Microphone (2 pcs)
  Brüel & Kjaer	BK 4129	Microphone
  Brüel & Kjaer	BK 2695	Preamplifier (2 pcs)
  MMF (NDK)	KB10	Accelerometer (3 pcs)
  MMF (NDK)	KB11	Accelerometer (5 pcs)
  MMF (NDK)	KB33	Accelerometer (4 pcs)
  MMF (NDK)	KB35	Accelerometer  (4 pcs)
  MMF (NDK)	KB45	Accelerometer (5 pcs)
  MMF (NDK)	KB91	Accelerometer (4 pcs)
  MMF (NDK)	KS50	Accelerometer  (4 pcs)
  Behringer	ECM8000	Microphone (6 pcs)

   

   

  

   

  Fig. 6. Brüel & Kjaer measurement devices