VOCAL’s Parametric Equalization (EQ) Filtering software is available as an individual software library
module or as part of VOCAL’s customizable Voice Quality Enhancement (VQE) SDK. Parametric EQ filters
provides user/implementer with the ability to shape the audio signal to meet their design requirements
or subjective preference for quality.
VOCAL’s software provides five main types of EQ filters to choose from:
- High Pass Filter – attenuates frequencies below the cutoff frequency
- Low Pass Filter – attenuates frequencies above the cutoff frequency
- High Shelving Filter – amplifies or attenuates frequencies above the cutoff frequency
- Low Shelving Filter – amplifies or attenuates frequencies below the cutoff frequency
- Peaking/Notching Filter – amplifies (peaking) or attenuates (notching) the specified frequency
EQ filters can be used in many points in the audio processing chain. For example, if an audio engineer needs to add some bass to the playback signal, then insert a low shelf filter with a positive gain factor. If the microphone signal contains a DC offset or low frequency noise, add a high pass filter to the audio chain. Parametric Equalization filters can be used to modified the frequency response of a signal to adhere to ITU and TIA Telephone performance standards.
Parametric Equalization Software Features
- C callable functions
- Floating point and optimized fixed-point code available
- Narrowband (8kHz) to Full-band (48kHz) sampling rates supported
- 16-bit and 32-bit (for 24-bit audio samples) API
- Fully Configuration Equalization Parameters
- Filter Selection (High-Pass, High Shelf, Low Pass, Low Shelf, Peaking/Notch)
- Cutoff Frequency
- Q factor
- Gain Level
- Sampling Rate
- Unlimited EQ bands supported
Parametric Equalization Applications
- Large Conference Room Speakerphones
- Bluetooth Headsets
- VoIP Softphones
- IP Intercoms
- Handheld PTT Radios
- Any application where the natural frequency response of audio transducer does not meet requirements
More Information
Platforms
VOCAL’s Parametric Equalization Filters software is available for the following platforms. Please contact
us for specific EQ filters supported platforms and performance information.
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