Digital Audio System; Audio System - Sony CBK-HD01 Maintenance Manual

1-2-5. Digital Audio System

DVP-45 board
1. Audio signal processing system
<Recording system>
The analog audio signal input from the AUDIO IN
connector is converted into a serial digital audio signal
(two channels) with the AUDIO A/D converter on the FP-
157 board. The digital audio signal enters CAVA (IC200)
of the DVP-45 board through the MB-1111 board.
The serial digital audio signal (four channels) input from
the AES/EBU INPUT connector undergoes level
conversion in the AXM-38 board and is input into CAVA
(IC200) of the DVP-45 board. After the signal is decoded
in CAVA (IC200), it is synchronized and converted to the
same sampling rated as the recorded video signal with the
sampling rate converter (IC700, IC703).
Digital audio signals (eight channels) that include input
HD-SDI signal (when the option is attached) are decoded
with the DCP-44 board. Then, the signals are converted
into serial digital audio signals and entered into CAVA
(IC200) of the DVP-45 board via the MB-1111 board.
CAVA (IC200) selects the above entered digital audio
signal and sends it as the recorded audio data to AUDIO
REC DSP (IC800).
<Playback system>
The playback digital audio signal that underwent playback
signal processing in AUDIO PB DSP (IC801) is entered
into CAVA (IC200), then separated and converted into the
serial digital audio signals for analog output systems and
digital output systems.
The analog output system serial digital audio signal is sent
to the AUDIO D/A converter in the FP-157 board via the
MB-1111 board. After it is converted into an analog audio
signal, the signal is output to the AUDIO OUT connector,
headphone, and monitor speaker.
The digital output system serial digital audio signal is sent
to the DCP-44 board via the MB-1111 board. The signal is
combined with the video signal in the DCP-44 board and
output as the HD/SD-SDI audio signal.
2. Digital signal processing system
<Recording system>
The recording audio data from CAVA (IC200) undergoes
signal processing such as recording level control, muting
process, and MIX/SWAP in AUDIO REC DSP (IC800),
and then it is sent to PIER G4 (IC1900) as recording digital
audio data.
1-12
The recording digital audio data is sent to AUDIO Low
Resolution DSP (IC900) through CAVA (IC200), Proxy
audio data is generated in compressed A-Low format, and
the data is sent to PIER G4 (IC1900).
The above recording digital audio data and recording
compressed Proxy audio data are written PIER_SDRAM
(IC1901 to IC1904).
The recording digital data from the i.LINK/network is sent
to PIER G4 (IC1900) via the PCI bus and written to the
PIER_SDRAM (IC1901 to IC1904).
While recording to a disc, the data in PIER_SDRAM
(IC1901 to IC1904) is sent to the DR-606 board via the
ATA interface.
<Playback system>
The audio data and the Proxy audio data are sent to PIER
G4 (IC1900) via the ATA interface and written to the
PIER_SDRAM (IC1901 to IC1904).
The playback digital audio data in PIER_SDRAM (IC1901
to IC1904) is sent from PIER G4 (IC1900) to AUDIO PB
DSP (IC801), After performing signal processing such as
limiter, playback level control, and mute processing, the
signal is input to CAVA (IC200).
The audio data and Proxy audio data in PIER_SDRAM
(IC1901 to IC1904) is provided to i.LINK/network via the
PCI bus as the MXF file data.
3. Sync signal system
The reference signal is always the 24.576 MHz clock
entered from the DCP-44 board, whether recording or
playing back.
This reference clock is divided and timing signal for 256
FS, 64 FS and FS audio processing is generated.

1-2-6. Audio System

Block structure
Front microphone amp
Input signal selector
A/D circuit (CH1&2)
A/D circuit (CH3&4)
D/A circuit
Final amp
Monitor amp
Rear input
DPS operation processing : DVP-45 board
: MA-162 board
: FP-157 board
: FP-157 board
: FP-157 board
: FP-157 board
: CNB-25 board
: FP-157 board
: AXM-38 board
PDW-700/V1 (E)