Post-production parameters

This set of parameters can still be changed after the database has been recorded. This can often be done in only one way, e.g. the signal-to-noise ratio  can only be decreased.

• Microphone  characteristics. These are output voltage/input pressure, bandwidth , linearity, impedance, directional sensitivity. The microphone type (manufacturer, model number) and speaking distance can be important parameters.
• Acoustic environment  of the reader (reverberation , echo es, noise )
• Signal-to-noise ratio  (dB)
• Signal level  (voltage RMS or dB V)
• Transmission channel  characteristics. This includes bandwidth , clipping , bit-errors , etc.