Electroglottograph

Electroglottograph

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EG2-PC EG90

About EG2-PC

About EG90

Specifications

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Tiger DRS Inc. 1998

Electroglottograph EG2-PC

Glottal Enterprises

Electroglottography is non-invasive method of measuring vocal fold contact during voicing without affecting speech production. The Electroglottograph (EGG) measures the variation in impedance to a very small electrical current between the electrode pair placed across the neck as the area of vocal fold contact changes during voicing. This two-channel Electroglottograph, model EG-2-PC, provides simultaneous EGG Waveforms at the neighboring neck location allowing correct electrode placement and verification of waveform accuracy. Using this patented multichannel approach not only makes the technique easier to use and more reliable, but also can allow the quantitative measurement of vertical laryngeal movement during voicing.

This EGG works with Vocal Assessment. Simply plug the cable into your sound card and record the signal via the electrodes or microphone.

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Electroglottograph EG90

F-J Electronics

Battery operated model with optocoupled transmission to SoundBlaster 16.

This new handy unit fits into your pocket.

Going mobile with EGG Assessment software is possible on PC laptop or desktop.

Size: 3 x 6 x 12 cm (So small) Weight: 170 g

Back

Portable battery-powered electroglottograph carried on the chest and fixed around tbe neck.

Electrodes: Neck electrodes (standard), or hand-held electrodes (optional).

Standard electrodes:

Electrodes area: For adults: circular stain-less steel, 24 mm in diameter (=4.52 cm²).
Electrode distance: Adjustable on a velcro strap.
Neck band: Elastic band.
Electrode voltage: Below 1 bolt.
Electrode current: Typical 3 mA, (Max. 9 mA).
Carrier frequency: Approx. 300 kHz.

Electronics:

Oscillator: Specially designed amplitude stable circuit with a low noise level.
Signal-to-noise ratio: 50 dB for a 4% variation in a 100 ohms electrode impedance.
Electrode impedance: The range approx. 50-250 ohms is accepted (dependent of the length of the leads and size of electrodes).
Dynamic range: 0-6% variation in electrode impedance.
Sensitivity switch: Sensitivity may be reduced –10 dB with a push button switch.
Frequency response: 3.5 Hz to 10,000 Hz at –3 dB. Cut-off frequencies without overshot.
Insulation: Battery-powered system. Completely insulated from PC by opto-electronic transmission.
Opto-coupler: Powered from the midi connector of the SoundBlaster board.
Output cable: 2 meters supplied with plug.
Output level: Matches the line input level (1 volt RMS) of the SoundBlaster boards.
Output impedance: Low impedance, but max. external load must be greater than 20 kohms.
Output connects to: When used together with a microphone, the EGG signal passes through the preamplifier PA11 to right channel.
When used without microphone, a special adapter connects the EGG output cable with:
1) the minijack socket for left-channel line input, and
2) the joystick/midi connector on the SoundBlaster 16 board.
The joystick/midi cable connector contains components for filtering the supply voltage.
Battery: Alkaline battery 9 volts (size PP3), min. 0.5 Amp/hours (equals at least 5000 recordings of 1 minutes each).
Off-on switch: Manually off and on. Automatically switched off a few seconds after electrode impedance goes outside registration range.
Current drawn: 6.5 mA from the 9 volts battery.
Output stage: Including the opto-coupler: 5 volts supply from external source (e.g. from the PC). Current drawn is typically 0.2 mA

Specifications for EG2-PC

Electrodes

Size: 34mm Diameter, Gold plated (Normal)
Carrier frequency: 2 MHz. 27mm Diameter, Gold plated (Optional)
Interelectrode Voltage: 1.5v Maximum
Noise: Equivalent to a change in interelectrode impedance of .003% typical, .005% maximum

Unit

Sensitivity @ 150W Avg. neck impedance: 1v / 0.1% change in neck impedance
Signal-to-noise ratio: 30dB Typical (26 dB Minimum).
Bandwith: Normal Output: 2Hz to 10KHz
Ext. LF Limit Output: 0.016 Hz to 10KHz
Current: 160 mA
Input Impedance: 37W
Output impedance: Normal, Ext. LF Limit Outputs: 300W
DEGG Output: 2K
Battery Life: 40 Hours (Alkaline Cells)

Mechanical

Size: 8.74 cm (H) x 26.66 cm (W) x 20.09 cm(D)
Weight: 1.70 Kg without batteries
Output Jacks: Standard BNC connectors

Home | Products | Distributors | Information | Contact us

Tiger DRS Inc. 1998