ADSP-214xx SHARC Processor Hardware Reference C-5
Audio Frame Formats
device. If the transmitter is sending 32 bits per channel to a device with
only 24 bits of internal precision, the receiver ignores the extra bits of pre-
cision by not storing the bits past the 24th bit. Likewise, if the transmitter
is sending 16 bits per channel to a receiving device with 24 bits of preci-
sion, the receiver zero-fills the missing bits. This feature makes it possible
to mix and match components of varying precision without re
configuration.
Left-Justified Mode
Left-justified mode (also known as SONY Format) is a mode where in
each frame sync cycle two samples of data are transmitted/received—one
sample on the high segment of the frame sync, the other on the low seg-
ment of the frame sync. Prior to development of the I
2
S standard, many
manufacturers used a variety of non-standard stereo modes. Some compa-
nies continue to use this mode, which is supported by many of today’s
audio front-end devices.
Programs have control over various attributes of this mode. One attribute
is the number of bits (8- to 32-bit word lengths). However, each sample of
the pair that occurs on each frame sync must be the same length.
Right-Justified Mode
Right-justified mode is a mode where in each frame sync cycle two sam-
ples of data are transmitted/received—one sample on the high segment of
the frame sync, the other on the low segment of the frame sync. Prior to
development of the I
2
S standard, many manufacturers used a variety of
non-standard stereo modes. Some companies continue to use this mode,
which is supported by many of today’s audio front-end devices.
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