WMA (Windows Media Audio)
This is the audio compression technology developed by Microsoft
Corporation.
WMA data can be encoded using Windows Media
®
Player.
To encode WMA files, only use applications authorized by Microsoft
Corporation. If you use an unauthorized application, the file may not work
properly.
Sampling frequency
Sampling involves taking a reading of a sound wave (analog signal) at
regular intervals and expressing the height of the wave at each reading in
digitized format (producing a digital signal).
The number of readings taken in one second is called the “sampling
frequency”. The larger the value, the closer the reproduced sound is to the
original.
Speaker impedance
This is an AC resistance value, indicated in Ω (ohms).
Greater power can be obtained when this value is smaller.
Dynamic range
The difference between the maximum undistorted sound level and the
minimum discernible level above the noise emitted by the device.
Bit rate
This expresses the read amount per 1 second of video/audio data
recorded in a disc. A larger number means higher sound quality, but also
means a larger file size.
Protection circuit
This is a function to prevent damage to devices within the power supply
when an abnormality such as an overload, excess voltage occurs or over
temperature for any reason.
Linear PCM
This is an uncompressed PCM (Pulse Code Modulation) signal. This is the
same system used for CD audio but uses 192 kHz, 96 kHz, and 48 kHz
sampling frequencies on Blu-ray Disc or DVD and provides higher
resolution than CD.
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