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WMA is a compression coding method for voice data developed by Microsoft Corporation in the United States. The standard file extension when saving as a single file is “.wma”, and it can be saved to a video file as audio that accompanies the video. The company’s Windows, etc. are supported as standard.<\/p>\n
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General description
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It employs a lossy compression method that dramatically increases the compression efficiency by slightly modifying or reducing the data so that it is difficult for the human ear to notice, and adopts the user’s desired combination of sound quality and compression ratio in the time of encoding. It can be selected step by step. If the sound quality is high, the compression rate is low (the data after compression is large), and if the sound quality is low, the compression rate is high.<\/p>\n
It was often compared to MP3 (MPEG Audio Layer-3), which was the standard format for audio compression at the time of the announcement, but in the same company, WMA requires about half the amount of data as MP3 (quality sound comparable to CD ) Can be recorded at 64 kbps ). As the version goes up, the algorithm is improved and the compression efficiency is improved.<\/p>\n
Initially, only the constant bit rate (CBR) method was supported, which always records the same number of bits per unit of time, but as of version 9, a variable bit rate that allocates a large number of bits to places with drastic changes. also supports ( VBR : variable bit rate) and average bit rate ( ABR : average bit rate) which adjusts the average amount of VBR data to be constant.<\/p>\n
The first version was released in 1999, and new versions have been announced with the Windows Media Player update. As derived specifications, “WMA Lossless” with lossless compression, “WMA Voice” specialized for voice recording, and “WMA Pro” with higher sound quality and multi-channel support (up to 7.1 channels) have been added. Unlike these, normal WMA is sometimes referred to as “standard WMA”, but even if not specified, WMA is almost always referred to as this.<\/p>\n","protected":false},"excerpt":{"rendered":"