【多选题】
Which two statements are true about the digital audio in a VoIP network？ （）
A、 Standard encoding techniques create an uncompressed digital data rate of 4000 bps.
B、 Standard encoding techniques create an uncompressed digital data rate of 8000 bps.
C、 Standard encoding techniques create an uncompressed digital data rate of 64，000 bps.
D、 Voice quality is not a concern if compression is not used.
E、 Two methods of quantization are linear and logarithmic.
F、 Two methods of compression are u-law and a-law.
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