The LD-DPS provides fast and accurate DPOAE measurements in a compact and portable form factor.
The device uses the adaptive modeling of both the DPOAE recording channels and the interference/noise channels to extract real time DPOAE signals. It employs dedicated sensors for noise modelling. With this signal processing and data acquisition, the system can efficiently filter out the in-band noise and track the DPOAE suppression in real time. The system has achieved higher tracking speeds and accuracy than the Kalman Filter based real-time DPOAE measurement.
Features:
- Integrated Design:
- The Data Acquisition box includes all the necessary hardware for DPOAE suppression testing in a single unit
- Wideband, low noise, low distortion amplifiers for probe microphones and speakers
- ADC: 4 channels, 24bits, sampling rate-93,750 Hz.
- DAC: 4 channels, 24bits, sampling rate-93,750 Hz.
- Primary tone generators, suppressor stimuli generators.
- Built-in medical grade isolator for noise reduction and electrical safety.
- High speed USB 2.0.
- Dual probe configuration:
- Each probe can function as a DPOAE probe and/or as a suppressor probe. The software configures the probe functions automatically based on test tasks.
- DP-Gram, IO-Gram test options:
- F1,F2 :0.2 KHz to 16 KHz, user settable F2/F1 ratio
- L1,L2: 30 to 85 dBSPL
- SP-Gram (Suppression Gram) test:
- Real-time DPOAE as well as synchronized running average.
- Suppressor configuration:
- Contra-lateral
- Ipsi-lateral (optional, under development).
- Suppressor type:
- Gaussian white noise
- Narrow band noise (optional, under development)
- Pure-tones (optional, under development).
- Suppressor control: configurable ON-OFF time, Period and level.
- Synchronized running average: configurable artefacts rejection
- Time resolution: 0.8 (ms)
- Database and other support software:
- DP-Gram, IO-Gram test records:
- Subject info
- Test protocols
- Test Results
- SP-Gram (Suppression Gram) test records:
- Subject info
- Test Protocols
- Synch Average results and raw Suppression Gram data
- Utility program functions:
- Export database data to MS Excel file
- Post processing of raw Suppression Gram data
- Allow replay of recorded real-time DPOAE
- Allow offline re-processing of the recorded real-time SP data with user configurable settings.
- Multiple view of test data: graph view and table view.
- Easy to use GUI – many functions are self-explained through labeling and can be done with a single mouse click.
- DP-Gram, IO-Gram test records:
Documents
For details of the DSP algorithms please refer LD-DPS DSP Algorithms , for how to use the system, please see the video below.
Narrated Instructional Video