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2. Playback Circuit
2-1. Playback Circuit
Fig.2-1 shows the playback circuit.
This unit, NW-HD3 can play back MP3 files. The conditions of the MP3 file that the unit can play back are as follows.
This unit, NW-HD3 can play back MP3 files. The conditions of the MP3 file that the unit can play back are as follows.
MPEG1 Audio Layer-3
Bit-rate: 32 to 320[kbps] (Corresponding to both CBR and VBR)
Sampling frequency: 32/44.1/48 [kHz]
= Flow of signals during the playback =
MULTI INTERFACE IC7001
MULTI INTERFACE IC7001 reads out the encrypted music data from HDD drive with the data bus lines and stores it into SD-RAM IC7002 corresponding to the command
sent from MAIN SYSTEM CONTROLLER IC1003.
MULTI INTERFACE IC7001 reads out the encrypted music data from HDD drive with the data bus lines and stores it into SD-RAM IC7002 corresponding to the command
sent from MAIN SYSTEM CONTROLLER IC1003.
MULTI INTERFACE IC7001
MULTI INTERFACE IC7001 reads out the encrypted music data from SD-RAM IC7002 and outputs it from pin-151 [DATA], in synchronization with the bit clock
(BCK, 64fs) from pin-150[BCK] and the LRCK signal (fs) from pin-149 [LRCK], to SUB SYSTEM CONTROLLER IC3001.
SUB SYSTEM CONTROLLER IC3001
In SUB SYSTEM CONTROLLER IC3001, MAGICGATE circuit decrypts the input encrypted data and extracts music data. Next, the music data is input to
ATARC3/ATRAC3plus/MP3 Decoder and is decoded. Then DA data is created. Next, the DA data is input to Sound Processor circuit and is controlled to the user setting
sound. Then the DA data is output from pin-15 [P10/PCMO] to MAIN SYSTEM CONTROLLER IC1003 in synchronization with the bit clock (BCK, 64fs) from
pin-13[P13/BCKO] and the LRCK signal (fs) from pin-14 [P14/LRCKO].
In SUB SYSTEM CONTROLLER IC3001, MAGICGATE circuit decrypts the input encrypted data and extracts music data. Next, the music data is input to
ATARC3/ATRAC3plus/MP3 Decoder and is decoded. Then DA data is created. Next, the DA data is input to Sound Processor circuit and is controlled to the user setting
sound. Then the DA data is output from pin-15 [P10/PCMO] to MAIN SYSTEM CONTROLLER IC1003 in synchronization with the bit clock (BCK, 64fs) from
pin-13[P13/BCKO] and the LRCK signal (fs) from pin-14 [P14/LRCKO].
MAIN SYSTEM CONTROLLER IC1003
In MAIN SYSTEM CONTROLLER IC1003, the input DA data is converted from Digital Data to Analog Signals in the D/A converter circuit after being controlled the volume
level.
In MAIN SYSTEM CONTROLLER IC1003, the input DA data is converted from Digital Data to Analog Signals in the D/A converter circuit after being controlled the volume
level.
MAIN SYSTEM CONTROLLER IC1003
System Controller IC1003 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
System Controller IC1003 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
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