Waveview System

The Waveview System is a complete turnkey hardware/software solution allowing researchers and students to visualize the airflow pulses at the glottis during voiced speech and singing using a fast, easy, non-invasiveA non-invasive measurement is one that does not require the introduction of instruments into the body. mask and inverse-filteringIn signal processing, for a filter g, an inverse filter h is one such that the sequence of applying g then h to a signal results in the original signal. Software or electronic inverse filters are often used to compensate for the effect of unwanted environmental filtering of signals software. The system is accurate down to zero frequency, not susceptible to low-frequency noise, compact, and easily calibrated.



Aeroview
A Waveview System.


The system uses a handheld mask with a transducer, a data acquisition box with USB interface, and software which can be run on any Windows PC or laptop. Acquiring data is easy: Your test subject vocalizes into the mask, and data is recorded and immediately visualized onscreen by the software. The user then uses the efficient, intuitive controls in the software to quickly and easily apply an inverse-filtering technique to the oral airflow recording, leaving only the airflow waveform from the glottis.



Aeroview
Screenshot of Waveview showing an example of the vowel /a/ from a male subject being inverse filtered.


Waveview can do much more, however. The Waveview System also permits low-frequency phase correction of an EGG or microphone signal waveform, computes and displays average airflow and sound pressure level (SPL)Sound pressure level is a logarithmic measure of the RMS sound pressure of a sound relative to a reference value, the threshold of hearing. It is measured in decibels (dB) calculated from airflow, calculates and displays two versions of the AC/DC ratio first proposed by Isshiki, provides simplified offset and amplitude calibration for airflow, and offers a convenient means for correcting the time alignment between inverse-filtered glottal waveforms and EGG traces.



Calibration
The FC-1 calibrator provides an easy, accurate and economical means for calibrating all Glottal Enterprises systems for recording airflow. Operation is simple enough so that calibration can be quickly checked before each measurement series to verify that system parameters have not been changed.






This product is for research and teaching purposes only. It is not a medical device. It is not intended to be used in the diagnosis, cure, treatment, mitigation or prevention of disease and it is not intended to affect the structure or function of the body.

Features
  • Compatibility with Windows XP/Vista/7/8
  • Powered by USB or external power supply
  • Data automatically saved in standard 2-channel .wav format
  • Adjustable gains to accommodate very quiet speech as well as loud singing
  • OroNasalRelating to the mouth and nose mask for minimal acoustic distortion
  • Easy-to-use inverse filter interface
  • Shows clearly the correlation between the features of an EGG waveform and the features of the glottal airflow pulse. Includes EGG time correction and low frequency phase correction.
  • Lets the user control and trim the inverse filter settings, with automatic pre-set settings also available.
  • Waveview shows clearly the relationships between time and frequency domain correlates of voice parameters such as vocal period, formant frequency and formant damping, making it an excellent instructional tool.




This product is for research and teaching purposes only. It is not a medical device. It is not intended to be used in the diagnosis, cure, treatment, mitigation or prevention of disease and it is not intended to affect the structure or function of the body.

Waveview Software

Glottal Enterprises has developed the Waveview and computer programs for inverse filtering CV-mask (airflow) or microphone (radiated pressure) waveforms during speech and singing. We have kept the user interface simple and intuitive, to make it useful for students as well as voice researchers.

Waveview can be purchased as a complete turnkey system, incuding a CV mask, transducer, A/D and preampifier electronics, airflow calibrator, and microphone, or as software to use with your own hardware that produces signals in a standard WAV-file format.

Waveview is designed as a convenient computer program for performing inverse-filtering of an oral airflow (CV mask) or radiated pressure (omni-directional microphone) waveform. In performing inverse-filtering, it can be used with WAV-encoded files recorded by any system for capturing airflow or audio waveforms. However, Waveview can do much more. The Waveview program also permits low-frequency phase correction of a microphone signal waveform, computes and displays average airflow and sound pressure level (SPL) calculated from airflow, calculates and displays two versions of the AC/DC ratio first proposed by Isshiki and provides simplified offset and amplitude calibration for airflow.



Aeroview




This product is for research and teaching purposes only. It is not a medical device. It is not intended to be used in the diagnosis, cure, treatment, mitigation or prevention of disease and it is not intended to affect the structure or function of the body.

System Components



WaveviewPro System Package
Includes:
  • A- FC-1C Flow Calibrator
  • B- MS-110 A-D Transducer Electronics
  • C- OroNasal 2-chamber CV Teen-Adult Mask with screen rings
  • D- OroNasal 2-chamber CV Child Size Mask with screen rings
  • E- (2) PT-2E Pressure Transducers
  • F- Mask Handle for using OroNasal Mask
  • • Waveview Software








This product is for research and teaching purposes only. It is not a medical device. It is not intended to be used in the diagnosis, cure, treatment, mitigation or prevention of disease and it is not intended to affect the structure or function of the body.

Pictures

slideshow
Videos

FAQs

1. How large is the system?

The system has multiple components and will fit easily on a desk.

2. Can I use the Aeroview System with my PC? MAC? iPad? Laptop?

Aeroview can be used on a desktop or laptop with Windows XP/Vista/7. Our software cannot be use on iOS, but it s hould function on a Mac running Windows OS. Tablets and smart phones are not supported.

3. What kind of files does this system generate?

Recorded data is saved as WAV. Calibration information is saved as XML.

4. How is data recorded? How large?

Data is sent to the computer via the MS-110 A/D convert USB port. Recorded files are in the 50-500kB range.

5. Can I use my own DAQ system?

Yes, by using the analog outputs of the MS-110 to the DAQ system of your choice.

6. How accurately are airflow and air pressure measured?

Measurements are within +/- 5%.

7. Mask hygiene? How do I clean it?

Our masks are medical grade silicon and can be autoclaved for sterilization.

8. How do I get replacement or extra parts for my Waveview System?

All parts can be replaced through Glottal. Consumables such as the OPA tubes, mask plugs, and screen rings can be reordered as needed.

9. Can it be used on children and infants?

Yes. Our small mask is suitable for children.

10. How do I get technical support?

Call or email Glottal Enterprises and our team of engineers will assist you.

11. Can I inverse filter files that were recorded with other equipment?

Yes. Waveview can load data saved in a .wav file.

12. Will the OroNasal mask acoustically distort the voice of my subjects during recording?

Yes, negligibly (see our sound samples). The Glottal Enterprises OroNasal mask is specifically designed to minimize acoustic distortion which maximizes the intelligibility of the subject’s speech, especially when being recorded by an external microphone.

13. How many channels of data can this system record?

The MS-110 can record 2 channels of data. The software presents a third channel—the audio is derived from the airflow data.

14. Can I also acquire signals from another source such as a microphone with this system?

Yes. Any line-level signal may be passed through the MS-110 to be recorded, such as a microphone signal accompanying the airflow or air pressure signal.