Circuit Operating Descriptions
7-47
(3) DVD Audio Output
1) Compressed Data
The audio data inputted to U1 (Vibratto
∏
) A/V decoder is divided into compressed data and uncompressed data.
It is compressed data that is compressed with multi-channel audio data such as Dolby digital, MPEG, DTS,
WMA,etc. The compressed data inputted to (Vibratto
∏
) is converted into the uncompressed data of 2, 4,
and 6 channels through U1 built-in audio decoder and is outputted to Data 0 through digital audio interface.
The compressed data is transmitted to external AC-3 amplifier or MPEG/DTS amplifier as IEC-958/1937 trans-
mission data format compressed by U1 built-in IEC-958 output process.
2) Uncompressed Data
The uncompressed data is that data isn’t compressed, so it is called CD-DA, LPCM data.
The 2 channels data is converted through audio decoder 2-channel data and Data 0 and are outputted in digital
audio interface.Via IEC-958 output process, they is transmitted to digital amplifier or AC-3/MPEG/DTS amplifier
built in the external digital input source with IEC-958/1937 transmission format.
AUDIO INPUT
BUFFER
AUDIO OUTPUT
BUFFER
RECEIVER
or
DECODER
(IEC-958/1937)
AUDIO
DAC
HOST or DVD/CD
INTERFACE
IEC-958/1937
OUTPUT PROCESS
IEC-958/1937
INTERFACE
AUDIO DECODER
(MPEG, DOLBY DIGITAL,
CD-DA, LPCM, WMA
DIGITAL AUDIO
INTERFACE
2-, 4, or 6-
CHANNEL OUTPUT
PROCESS
Uncompressed 16- or 24-bit
LPCM samples at
fs=44.1,48,96KHz
2-Channel LPCM, Decoded
Dolby Digital, Decoded MPEG, WMA
Compressed Data WMA
(MPEG, Dolby Digital),
CD-DA, LPCM
DIC2 (LOCAL DRAM)
ZIC1 (Vibratto
II
; A/V DECODER)
Source Data Types :
MPEG-1,-2, Dolby Digital,
CD-DA, LPCM, WMA
Fig. 7-42 Audio Decoder and Output Interface Datapath
