Samsung DVD-909 Service Manual page 77

Circuit Descriptions
6-7-2 DVD Audio Output
VIC4, 10 (LOCAL DRAM)
AUDIO INPUT
BUFFER
AUDIO OUTPUT
BUFFER
1) Compressed Data
The audio data inputted to VIC1 (ZiVA-3) 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, etc.
The compressed data inputted to VIC1 (ZiVA-3) is converted into the uncompressed data of 2, 4, and 6 channels
through ZiVA-3 built-in audio decoder and is outputted to Data 0, 1, 2, and 3 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 ZiVA-3 built-in IEC-958 output process.
2) Uncompressed Data
The uncompressed data is that data isnÕt 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 Data 1 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.
6-20
Source Data Types :
MPEG-1,-2, Dolby Digital,
CD-DA, LPCM
HOST or DVD/CD
INTERFACE
Compressed Data
(MPEG, Dolby Digital),
CD-DA, LPCM
AUDIO DECODER
(MPEG, DOLBY DIGITAL,
CD-DA, LPCM
Fig. 6-25 Audio Decoder and Output Interface Datapath
VIC1 (ZiVA-3 ; A/V DECODER)
IEC-958/1937 IEC-958/1937
OUTPUT PROCESS
2-Channel LPCM, Decoder
Dolby Digital, Decoded MPEG
Uncompressed 16- or 24-bit
LPCM camples at
fs=44.1,48,96KHz
2-, 4, or 6-
DIGITAL AUDIO
CHANNEL OUTPUT
PROCESS
RECEIVER
DECODER
INTERFACE
(IEC-958/1937)
INTERFACE
Samsung Electronics
or
AUDIO
DAC