YSS915
Karaoke Processor 2 for Video disc player
(KP2V2)
INTRODUCTION
YSS915 (KP2V2) is an LSI for processing Karaoke voice signals.
This LSI has an A/D converter (1 channel) for the microphone echo, and a memory for the microphone echo and
key control. These features allow achieving the functions needed for the Karaoke system by using only one LSI
chip. As for the microphone echoes, many other types of echoes are available in addition to ordinary ones so that
YSS915 is applicable to various uses.
In addition to these Karaoke programs, YSS915 is able to provide the Movie & Music programs, with which the
surround effect is applied to the movie and music sources for giving the users more enjoyment.
YSS915 is pin compatible with and register compatible with YSS903 (KP2V).
[ Fundamental Functions ]
1)
Karaoke program
FEATURES
•
Key Control (Control by 50 cents in +/- 600 cent range, +/- one octave, etc.)
•
Voice Cancel
•
•
•
•
•
•
Microphone Echo
Normal microphone echo (174 msec or less (fs = 44.1 kHz))
Stereo-Echo/ Reverb-Echo
Microphone Key Control (+/- 10 cents, +/- 20 cents, +/- 400 cents, +/- 700 cents and +/- 1 octave)
Microphone "YMERSION™"
Tone Control
Bass, Mid-tone, Treble (0 to +/- 10 dB at 2 dB steps)
Surround
"YMERSION™" (Yamaha's original wide surround technology)
2)
Movie and music program
Surround
•
Initial reflection sound synthesizing system
•
Yamaha "YMERSION™"
Tone Control
•
Bass, Mid-tone, Treble (0 to +/- 10 dB at 2 dB steps)
•
•
•
•
•
[ I/O Interface ]
Digital signal inputs
Digital signal outputs
Analog signal input
Microprocessor interface
Through-mode
: 2 channels (16/18/20/24 bits)
: 2 channels (16/18/20/24 bits)
: 1 channel ( for the microphone )
: Serial four line system
: Digital input is outputted without any processing
(Correspond with fs = 96 kHz 24 bit DVD format)
•
Pin/register upper compatible with YSS903 (KP2V)
•
Sampling frequency
: 32, 37.8, 44.1, 48 kHz or correspond with 96 kHz through-mode.
•
Package
: 28 pin SOP ( YSS915-M )
[
Others
]
YAMAHA CORPORATION
YSS915
CATALOGUE No:LSI-4SS915A2
1999.09
YSS915
Difference between YSS903 and YSS915
1.
No built-in DAC.
(Refer to the process flow chart in “OPERATIONS”.)
2.
Connectable directly with MSB justified data output ADC.
(Refer to “Format 4” of “4. Digital audio interface” in “ FUNCTIONS”.)
3.
Microphone interface terminals CDI and CDO can be connected on the board.
This feature allows to reduce the number of ports by one.
(Refer to “5. Microcomputer interface” in “ FUNCTIONS”.)
4.
Input fader has been added for the microphone echo.
This feature allows to apply fade-in/fade-out control to the microphone echo through designation with
one bit from the microcomputer.
(Refer to “1. Karaoke program” in “ OPERATIONS”, and “3) VCR ($02)” of “1. Functions” in
“REGISTERS”.)
5.
Zero level detection function has been added for digital audio output.
YSS915 outputs “0” at the pin “ZERO” when an audio input has been zero for a certain period.
This signal can be used to improve S/N ratio by muting the output of external DAC.
(Refer to “6. Others” in “ FUNCTIONS”.)
6.
An output port PO has been added for controlling peripheral devices.
The port “PO” can be used, as an example, to control the gain of audio output amplifier through this
LSI from the microcomputer.
(Refer to “6. Others” in “ FUNCTIONS”.)
7.
A mode with extended band width for microphone echo has been newly added.
Two types of cut-off frequency have been added for the low pass filter.
(Refer to “7) RVR ($06)” and “11) MDR ($1C)” of “1. Functions” in “REGISTERS”.)
8.
Internal DSP has been given the operation accuracy of 20 bits.
Internal multiplier-accumulator become 20bit*13bit=24bit therefore overall bit accuracy become
improved from 18bit(YSS903) to 20bit(YSS915).
In through-mode which internal DSP is not used for processing the accuracy of input data is
maintained to output.
2
YSS915
PIN CONFIGURATION
DI
BCI
DO
L/R
DVDD1
BCO
DVSS1
AVDD
PLLC
AVSS
ADC1
ADC2
VREF
MICIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SDSY
CDO
CDI
/SCK
/CS
P0
XISEL/ZERO
DVSS2
DEPI
DVDD2
/IC
XI
AOR
AOL
< 28pin SOP Top View >
3
YSS915
PIN FUNCTION
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Name
DI
BCI
DO
L/R
DVDD1
BCO
DVSS1
AVDD
PLLC
AVSS
ADC1
ADC2
VREF
MICIN
AOL
AOR
XI
/IC
DVDD2
DEPI
DVSS2
XISEL/ZERO
P0
/CS
/SCK
CDI
CDO
SDSY
Notes ;
+ : Pull up
A : Analog terminal
I/O
(See Note1)
I+
I+
O+
O
-
O
-
-A
-A
-A
-A
-A
OA
IA
OA
OA
I
I
-
I
-
I+/O
I+/O
I
I
I
O+
I+
Digital audio input
Digital audio input
Digital audio output
Digital audio output
Digital audio output
Function
Serial data
Bit clock
Serial data
Word clock
Bit clock
Power supply, +5 V (for digital system)
Ground (for digital system)
Power supply, +5 V (for analog system)
Connecting resistor and capacitor for PLL
Ground (for analog system)
Connecting capacitor for ADC
Connecting capacitor for ADC
Referential voltage output
Analog input, analog voice signal for microphone channel
Outputs analog voice signal for L channel
Outputs analog voice signal for R channel
External clock input
Initial clear (Low active)
Power supply, +5 V (for digital system)
De-emphasis control (H : On, L : Off)
Ground (for digital system)
Switches master clock rate/ZERO output
Test input terminal /P0 output
Microcomputer interface input
Microcomputer interface input
Microcomputer interface input
Digital audio input
Chip select
Serial clock
Serial data
Microcomputer interface output Serial data
Word clock
4
YSS915
BLOCK DIAGRAM
This LSI has two input channels (L and R) and two output channels (L and R) for digital audio interface. It also has a
one bit Delta-Sigma type AD converter 1 channel (microphone) that performs Delta-Sigma modulation at its analog
block, and decimation/interpolation of 128 times at its DSP.
Karaoke audio signal is processed by DSP for processing Karaoke audio signal and RAM for delay.
For the details of Karaoke audio signal processing, please refer to "OPERATIONS".
The parameters of this LSI are set through CPU interface. For the details of the parameters, please refer to
"REGISTERS".
/CS
CDI
/SCK
CDO
P0
DEPI
KP2V2
CPU interface
SDSY,DI,BCI
DO,L/R,BCO
ZERO
Digital I/O
Interface
RAM
for delay
DSP
Program ROM
MICIN
Analog block
AOL
AOR
/IC
Clock
generator
XISEL
VREF
ADC2
XI
PLLC
ADC1
MODES
Name of mode
KP2
standard mode
KP2V
extended mode
Code
N
Description
The functions of KP2 (YSS216B) can be used. The registers are compatible, except that
the coefficient registers (addresses $27 and $30 to $33) of KP2 that controls the analog
audio input and analog microphone echo output cannot be used because YSS903 does not
have these ports.
Every function of this device can be used.
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