Marantz CD-7 - 14. EXPLANATION OF DSP; DSP-1 (Q507) Functions; DSP-2 (Q509) Functions; DSP Operation and Parameter Flow

14. EXPLANATION OF DSP
The digital processing for DSP-1/DSP-2 (DSP56004) is the
following compositions.
1. DSP-1 (Q507)
Mute (32-Sample<cosine curve> approx. 0.7mS)
-12dB attenuation (It is not available for CD-7)
De-emphasis (44k / 48k mode)
DC-Filter ON/OFF (It is fixed for CD-7)
Signal format (IIS-IN/OUT)
2. DSP-2 (Q509)
Digital filter (4fs<FIR>, 3Type-mode)
Noise shaper (first order) and Round
Offset of Output-DATA
Signal format (HS-IN/OUT)
Procedure of DSP
The DSP56004 (Q507/Q509) loads data of ROM (Q506/Q508)
at that moment of the product is POWER ON. The all param-
eters of default setting will be done approx. 0.5 seconds. And
then, each DSP device starts digital processing by each pa-
rameter.
The product is set in Filter-1 of CD-mode initially wnen POWER
ON.
When the filter and the noise shaper is shifted and the sam-
pling frequency is shifted to other frequency except 44.1kHz,
Those parameters are changed to other parameters.
REMARK : The change of the sampling frequency depend on
~ the input of digital signal.
These changes of parameters are based on the function tables
of ROM-1 and ROM-2 (Figure 1). Each function of DSP-1 and
DSP-2 actuates individually.
If signals are confirmed at the input or output pins of DSP, that
is actuated for DSP.
The setting confirmation of each mode after the parameter
updated, which will be able to refer to the impulse signals of
timing chart (Figure 2).
When mute or de-emphasis is switched, the parameters is not
changed.
Because these switches control the pins of DSP devise (Q507)
directly. '
Then, the following status are confirmed by the pin control
status.
Mute Pin 73(Q507) : High = on, Low = off
De-emphasis Pin 74(Q507) : High = on, Low = off
39
14. DSP OBtRA
DSPS6DAIC KS TY SIVMBIEW EIT SHERICEO TOE
°
“
. DSP1 (0507)
@=2— hBRE (AY 1 YA—TFickS 32-Sample # 0. 7S).
@-120B 7 vy FAY FV BRE (CD-7 BAS).
Or LIT Y ABE (44k/48k).
@ 0C-Filter SBE, ON/OFF BIBE(CD-7 Cid BE).
@(2374—Vy CLIS-IN/OUT).
2. DSP2 (0509)
OF LZIV7 14 IV R—BRE (FIRICES 4fs, 3Type-mode).
@/ (ALY x6—/\—BE (first order) RUDUY F.
@ Output-DATADA Dey b BEE.
@ES7 +—Vy bCIIS-IN/OUT).
DSP OB Fata
DSP56004 (0507/0509) tk EIR ON Ic LEB, Ute y hARRED 51256
EDS Htc ROM (0506/0508) OF ~Z#O—-FLES,
T ORGA. SsecCF 4 DAIV KONDX-2R-ORELS CHT
LES.
RISZESVSPMEHENONS XK-BAKSTV ANE
aa LES.
BRON (CUBS MY v IVE C- E— FO Filter-1 HREC
HET.
FRERSVITKSFilterkE/ 1 RYI-N-OBEROVYTSY
YF ABRODVURADBSIMRY. MKEENDA-AACLS
FIZVABCYVEDVETF,
CNEOINDS X—A-—OHBBIERON-1 LE RON-2O BBR (Table 1)
KOTRETHET, RBRDSODSESIE THENOK
Blt DSP-1 & DSP-2IcC KOC. AHICEELES.
Efe. DSPAEMHEL TOD ES IME. DSPOAMAE VICE SOW
THETE CHBCEES, NZ X-2A-OBRPENTENE
NHE— FICREEHNEDES DS. IND XA-A-DERY—-TF
YADA LF+v—bk Figure VOT VINVAES ORE ES
CHEE LET.
Sa-hEF ALY IP YRAOO/OFFCENG XK-R-OBRE
EGOECGA. THSOMVBAIS DSP (0507) OlmF 2 BHHIY
KO~UVLTWES, HOT, Pine NY bO-WFSBIEY
FacORKREHRCELT.
=a—-t 2Pin 73(Q507)=High CH Y. Low C47.
FarLVYIPYVA Pin 74(Q507)=High C4 vy. Low C47.
Table 1
ROM- 1 ROM-2
7h =a
Al4 | A1Z | AlZ | Att | FUNCTIONS | AIS AVS | AIS AN2 | FILTERS (PARAMETER)
am aed °
L L L L 44kHZ_ node f x L bo FILZ (44.1kHz COEFFICIENT)
L L L H =---__node x L L H FIL2 (44.1kHZ COEFFICIENT) i
L E H L | 48kHz node {_ x b H u Fiti (44,1kKHzZ COEFFICIENT)
+ ;—
X L H| H ----
x H Lote FIL3 (48kHz_ COEFFICIENT)
IX H L H FIL2 (48kHz COEFFICIENT)
— +
{Xx H H tof Fit) (48kHz COEFFICIENT) |
Pela BS ies Es Fee ce
Figure 1
BSP PARAMETER SETTING TINING
Somsec
ee ae
MUTE
—
NOTE:AIS IS USED TO SWITCH ON/OFF THE NOISE SHAPER (LOW=OFF)
SOmsec
1
——
H
t
um
44KHZ /48KHZ
OSP1
(9507)
SOmsec
PARI/PAR2/PAR3
NSSH
BSP2
(9509) RSB2
H H
H i
—~ 0.2sec ——
0.5sec
“
'
i
'
“
I
I
I
:
'
H
i ' ‘
“ ' H \
i H t
‘ \ '
H H
‘“ '
ve ! '
ui : H
t
i '
i 1 ‘ {
(a
: '
Hl ,
y ' H :
H ' i H
' '
2-DSP CONTROL FLOW ANB BATA STREAM
18S0 |
DSPS6004 (9509)
'
1
1
H H
{ —s 0.2sec @——
0.5sec
a i
" + SOnsec ‘
i
ASPS6004 (0507)
46
Aitkin = WSPF ics DSP-1 47 == SCF 5) DSP-2 @
SCA wSOF 49
SI 3 $5 50
DADE | 1950.) 57 ROM (0508)
N. SHAPER 20
MUTE/ATT/8C-F FILI/FIL2/FIL3 ROM-2
DEEMPH is bh»
a mM + w
19 ROM (9506) =z = <= =
1/0
eral
ROM-
1
|
|
RESET = Spe aye
RESET | =: RESET Si elsee [ome
‘ ABAR CONTROL
AND
LEB X4 DRIVE
‘ ny
3 zg 8) &
z| = al a} a| 2
mann ADDR CONTROL REbD
R581 SP") RSB2 {LED CONTROL
CONTROL
MODE DETECTOR & ROM ADDRESS
LOGIC AND CPU
SELECT
FILI
- FROM FRONT KEY SENS J Fitz
FOR LED DRIVE hese CGeeeS
40
ROA
BLOA
4 CLDA DATA
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