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Frequency Response
A plot or graph of frequencies that an audio device, such as a microphone, amplifier or speaker, can accurately
reproduce within stated parameters or conditions.
Harmonics
A tone mixed with whole-number multiples of the fundamental tone that distinguish the pitch of a particular
instrument or sound.
Harmonic Distortion
The occurrence of harmonics within the output signal which are not present in the original input signal.
Hertz (Hz) / KiloHertz (kHz)
A unit of frequency measurement used to express the number of complete cycles occurring in a one-second interval.
Impulse Response
A lot of information about a device can be determined by how it reacts to a particular impulse. Impulse response
could be defined as a measure of the time domain response of a system, input-to-output, to a very brief transient
signal at its input. The Fourier transform of this time-domain waveform is the frequency-domain transfer function. So
frequency, phase, and transient responses are all related to this concept. In fact, the reverberation of a room can be
thought of as its impulse response.
I/O
Input/Output – A connection for channeling the flow of audio or signal data to and from a device.
Room Correction Score
A measure of how much processing is being performed in the room correction filters. The room correction score for a
specific RoomPerfect™ filter can be viewed by pressing the Info button from the initial (ERGO is ready to measure your
room) screen.
RoomKnowledge
Indicates how much information has been gathered about the room. See more details earlier in this manual.
Sampling Frequency
The number of analog audio signal samples taken in one second to produce a digital interpretation of the original
signal. The industry standard sampling frequency for CD-quality audio is 44.1 kHz, also referred to as “Sample Rate”.
THD
Total Harmonic Distortion is defined as the ratio of the sum of the powers of all harmonic components to the power of
the fundamental frequency.
Windows Driver Model
A driver model based on the Windows NT driver model that is designed to provide a common architecture of I/O
services for Windows operating systems for specific classes of drivers. This driver model is currently supported under
Windows 98 Second Edition, Windows Millennium Edition, Windows 2000, and Windows XP. WDM drivers provide
multichannel I/O.
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