Welcome Guest ( Log In | Register )

Why are 128kbit/s MP3s usually 44,100 Hz?
post Oct 14 2012, 01:44
Post #1

Group: Members
Posts: 30
Joined: 14-October 12
Member No.: 103838

Since 128kbit/s MP3s usually has a low-pass filter at 16,000 Hz, and the Nyquist-Shannon theorem states that all frequencies under f/2 Hz can be totally described at an f Hz sampling rate, why not encode at 32,000 Hz? Wouldn't it save more space?
Go to the top of the page
+Quote Post
Start new topic
post Oct 16 2012, 18:46
Post #2

LAME developer

Group: Developer
Posts: 783
Joined: 22-September 01
Member No.: 5

MPEG-1 Layer 3 frames consist of 2 granules a 576 samples. So a long block at 32 kHz has 18 ms duration, a short block 6 ms.
Go to the top of the page
+Quote Post

Posts in this topic

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:


RSS Lo-Fi Version Time is now: 19th April 2014 - 06:24