Technical Specification
Dual Mono [1 + 1 (L/ch1, R/ch2)]
This was introduced to allow two mono channels to be carried in the same
bandwidth as stereo signal. The main use for this mode is for multi-lingual
transmission where the decoder selects which language to decode on left or right.
Joint Stereo [2/0 joint]
This option is available for MPEG-1 Layer II only. This applies a technique called
intensity coding. The human ear is not as good at locating higher frequencies as it is
lower ones. The use of this mode may introduce more artifacts than stereo.
Stereo [2/0]
This mode treats the incoming audio signal as a left and right channel that the
viewer will listen to simultaneously. Practically, these stereo signals can be
uncorrelated where they are coded separately or related where they combined into a
sum and difference channel and each is coded separately.
6/8 Channel Phase Aligned Audio
For a description of the Phase Aligned Audio (PAA) mode, see Chapter 3, Getting
Started.
Bit Rates
The following table gives the coding modes and bit rates for MPEG-1 Layer II.
Table B.22 MPEG-1 Layer II Supported Bit Rates
Bit Rate (kbps)
Mono (Left or
Right)
Dual Mono Stereo Joint Stereo
6/8 Channel
Aligned
32 YES
48 YES
56 YES
64 YES YES YES YES
80 YES
96 YES YES YES YES
112 YES YES YES YES
128 YES YES YES YES
160 YES YES YES YES
192 YES YES YES YES
224 YES YES YES
256 YES YES YES
320 YES YES YES
384 YES YES YES YES
To Next Page
Loading...