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MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT DESCRIPTION
The M65856 is a CMOS IC built-in Digital Echo function with microphone peripheral circuits for "Karaoke" equipment packed in a single chip. It is suitable for "Karaoke" equipments such as Video CD Player, Mini Stereo, CD-Radio Cassette, TVor VCR.
FEATURES
High performance digital echo circuit thanks to 16Kbit memory Built-in surround function which works Simulated Stereo for monaural source and Stereo Surround for stereo source ALC-equipped microphone amplifiers permit excessively high input. ALC operating voltage can be set as desired. 2 microphone volumes, echo effect volume and echo feedback volume are included Stereo microphone-line mixing amplifiers Karaoke entertainment functions such as vocal cut and automatic vocal support system
Built-in interface terminal for external keycontrol IC Built-in current-control oscillation circuit Built-in automatic reset circuit activated with power on 5V single power supply
PIN CONFIGURATION
MIC SW MCLKCONT VALC MIC1IN ALC1 MIC1NFIN MIC1OUT MIC1VOLIN MIC2IN 1 2 3 4 5 6 7 8 9 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 DATA CLOCK LATCH PS2 PS1 VCFIL LOUT ROUT SOURCEOUT KEYCONIN RIN LIN VOL IN LPF2OUT LPF2IN2 LPF2IN1 DAINTOUT DAINTIN DACONT VCC GND
ALC2 10 MIC2NFIN MIC2OUT MIC2VOLIN MICOUT LPF1IN1 LPF1IN2 LPF1OUT 11 12 13 14 15 16 17 18 19 20 21
RECOMMENDED OPERATING CONDITION
Supply voltage range * * * * * * * * Vcc = 4.5 ~ 5.5V Rated supply voltage * * * * * * * * * * * * * Vcc = 5V
ADINTOUT ADINTIN ADCONT REF
SYSTEM CONFIGURATION
KEY CONTROL IC M65847FP
Lch INPUT
SOURCE SELECTOR L R
MIX PHASE SHIFTER SURROUND MIX
Lch OUTPUT
Rch INPUT
(L+R)/2 VOCAL CUT
Rch OUTPUT
ALC
MIC1 MIC VOL MIX ECHO MIC VOL FEEDBACK VOL ECHO VOL MIX
ALC
MIC2
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
PIN CONFIGURATION
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23 22 VCC GND
-COM
I/F
PHASE SHIFTER SURROUND
LPF
(L+R) / 2 L R STEREO
D/A
MIC SW
ECHO VOL
ECHO F.BVOL
16kbit SRAM
MAIN LOGIC
MCLK ALC
MIC VOL ALC
MIC VOL LPF A/D
1/2Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT PIN DESCRIPTION
Pin No.
Symbol MIC SW MCLKCONT VALC MIC1IN ALC1 MIC1NFIN MIC1OUT MIC1VOLIN MIC2IN ALC2 MIC2NFIN MIC2OUT MIC2VOLIN MICOUT LPF1IN1 LPF1IN2 LPF1OUT ADINTOUT ADINTIN ADCONT REF
Name
Microphone SW Clock control ALC operating voltage setting terminal Microphone 1 input ALC1 control Microphone 1 negative feedback input Microphone 1 output Microphone 1 volume input Microphone 2 input ALC2 control Microphone 2 negative feedback input Microphone 2 input Microphone 2 volume input Microphone output Low pass filter 1 input 1 Low pass filter 1 input 2 Low pass filter 1 output A/D integrator output A/D integrator input A/D control Reference power output
I/O
I
Function
L: MIC OFF H: MIC ON Controls built-in clock generation circuit with external R To set ALC operating voltage according
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
-
- to applied voltage
I
To connect MIC1 To connect ALC1 attack / recovery time
- setting capacitor
I O I I
To connect low cut-off frequency of MIC1 amplifier setting capacitor
To connect capacitor to reduce noise generated at time of volume change To connect MIC2 To connect ALC2 attack/recovery time To connect low cut-off frequency of MIC2 amplifier setting capacitor
- setting capacitor
I I I
To connect capacitor to reduce noise generated at time of volume change
O Mixing output of MIC1 and MIC2 I I O O I
Pre-filter before A/D convertor for digital delay
Composes D/A conversion integrator with external capacitor To determine adaptive time constant of
- A/D convertor with ADM system
- To connect 1/2 Vcc output and filter capacitor
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
Pin No.
Symbol GND VCC DACONT DAINTIN DAINTOUT LPF2IN1 LPF2IN2 LPF2OUT VOLIN LIN RIN KEYCONIN SOURCEOUT ROUT LOUT VCFIL PS1 PS2 LATCH CLOCK DATA
Name
Ground Power supply D/A control D/A Integrator input D/A integrator output
Low pass filter 2 input 1 Low pass filter 2 input 2 Low pass filter 2 output
I/O - - -
I O I I O I I I I O O O
Function
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
To determine adaptive time constant of D/A convertor with ADM system Composes D/A conversion integrator with external capacitor
Post-filter after D/A convertor for digital delay
Echo effect / Echo feed back volume input Lch line input Rch line input monaural input for external KEYCONTROL IC monaural output for external KEYCONTROL IC Rch output Lch output Vocal cut filter Phase shift input 1 Phase shift input 2 LATCH CLOCK DATA
To connect capacitor to reduce noise generated at time of volume change Lch line input Rch line input input/output interface terminal for external KEYCONTROL IC
Rch mixing output Lch mixing output Processes frequencies lower than the vocal band
-
I
Determines a constant at time of phase shift
I I I I
Latch input via serial bus Clock input via serial bus Data input via serial bus
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT ELECTRICAL CHARACTERISTICS
(Vcc=5V,f=1kHz,vi=100mVrms,Ta=25C Unless otherwise noted)
Limits Symbol
Icc
Parameter
Circuit current
Test conditions
No signal provided
Min - 44 - - -3 25 1.0 1.3 - 5
Typ 40 47 0.5 3.0 0 40 1.5 1.4 -68 10 0 -72 0.15 1.7 -96 0 -72 0.15 1.4 -96
Max 88 50 1.5 6.0 +3 55 2.0 - -57 20 +3 -67 0.30 - -90 +3 -67 0.30 - -90
Unit mA dB % % dB msec sec Vrms dBV K dB dBV % Vrms dBV dB dBV % Vrms dBV
Gvo THD1 THD2 VoALC
Amplifier gain Distortion Distortion ALC operating voltage measurement error
Vo = -17dBV Vo = -17dBV,with ALC not operated Vi= -37dBV,with ALC operated measurement : -10 to +3dBV C=4.7F C=4.7F
TALCAT ALC attack time TALCRE ALC recovery time
VoMAX Maximum output voltage THD=10% No Zi Gv Output noise voltage Input impedance I/O voltage gain Volume max Volume min Volume max THD=10% JIS - A Volume max Volume min Volume max Gv=47dB,f=100 to 5KHz
-3 - - 1.4 - -3 - - 1.1 -
ATTmax Maximum attenuation THD ViMAX No Gv Distortion Maximum input voltage Output noise voltage I/O voltage gain
ATTmax Maximum attenuation THD VoMAX No Distortion
Maximum output voltage THD=10% Output noise voltage JIS - A MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
Symbol
Gv VoMAX
Parameter
I/O voltage gain
Test conditions
Min -3 1.1 88.4 117.9
Limits Typ 0 1.4 104.0 138.7 156.0 208.1 1.0 1.5 1.5 2.0 -87 -85 -85 -82 0 0.02 1.7 -95 -70 20 18
Max +3 -
Unit dB Vrms
Maximum output voltage THD=10%
119.6 msec 159.5 msec 179.4 msec 239.3 msec 2.0 3.0 3.0 4.0 -72 -70 -70 -67 +3 0.04 - -90 -50 32 - % % % % dBV dBV dBV dBV dB % Vrms dBV dB K dB
Td
Delay Time
Sets Delay time with microcomputer.
132.6 176.9
Td=104.0mS,30KHzLPF Td=138.7mS,30KHzLPF THD Distortion Td=156.0mS,30KHzLPF Td=208.1mS,30KHzLPF Vi=0mVrms,JIS - A Td=104.0msec,Rg=620 Vi=0mVrms,JIS - A Td=138.7msec,Rg=620 Vi=0mVrms,JIS - A Td=156.0msec,Rg=620 Vi=0mVrms,JIS - A Td=208.1msec,Rg=620 Gv THD I/O voltage gain Distortion 30KHzLPF
- - - - - - - - -3 - 1.1 - - 13
No
Output noise voltage
VoMAX Maximum output voltage THD=10% No CS Zi Grej Output noise voltage Channel separation Input impedance Vocal removal ratio Vocal cut JIS - A,MIC SW OFF Lin=1kHz,Vi=1Vrms,Rout JIS - A
14
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol Vcc Vi Pd Topr Tstg
Name Supply voltage Circuit current Input Voltage Operating temperature Storage temperature
Test conditions
Ratings 6.0 -0.3 ~ Vcc+0.3 1.1 -20 ~ +75 -40 ~ +125
Units V V W C C
RECOMMENDED OPERATING CONDITION
Limits Symbol Vcc VIL VIH Parameter Supply voltage L input level H input level pin40,41,42 pin40,41,42 Test conditions Min 4.5 0 2.4 Typ 5 - - Max 5.5 0.8 VDD V V V Units
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION DESCRIPTION
OPERATION MODE Operating modes can be set with serial data 16-bits entered at the timing given below. DATA(pin42) is taken inside at the rising edge of CLOCK(pin41) and the last-packed 16-bits are latched at the raising edge of LATCH(pin40).
40
LATCH CLOCK
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
41
42
DATA
time
DATA FUNCTION D0 D1 Digital D2 echo D3 D4 Source D5 selector D6 D7 Phase shifter D8 surround Auto vocal D9 support ON / OFF
Control description Creates four kinds of delay signals between 104.0msec and 208.1msec.
DATA D0 D1
FUNCTION
Control description
Echo D2 effect Volume D3
Sets volume attenuation in 8 steps between +3dB ~ -15dBand -.
Desired audio source operation to each "karaoke" software can be selected by the Source selector. 5 kinds Surround is formed with phase shifter to increase the ambience of sound even when karaoke is used. If you are in discomfort from unknown song, the vocal of the singer can be output support you. Selector switch for turning on/off of auto vocal support.
D4 Echo Feed D5 Back D6 Volume D7 D8 D9 D10 D11 D12 D13 D14 D15 ADDRESS MIC2 Volume MIC1 Volume
Sets volume attenuation in 5 steps between -2dB ~ -7dB and -.
Sets volume attenuation in 8 steps between 0dB ~ -18dB and -.
External keycontrol IC changeover corresponding KEYCON D10 pass/through or decorresponding to changeover switch. MIC SW Selector switch for turning on/off of D11 ON / OFF microphone signal mixing.
Sets volume attenuation in 8 steps between 0dB ~ -18dB and -.
D12,D13 D14 ADDRESS D15
TEST mode Data is taken inside D14=[L],D15=[H],and others cancel. Data is taken inside D14=[L],D15=[H],and others cancel.
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION CONTROL
* DELAY TIME CONTROL Control Data D0 D3 D2 D1 L L L H H H L H H - L H 156.0msec 208.1msec Delay off mode L L H H H L H
(L+R) / 2 Vocal cut Stereo
* SOURCE SELECTOR Control Data Source select D0 D6 D5 D4 L L L L L H
Lch, monaural Rch, monaural
Delay time 104.0msec 138.7msec
L
-
H-
* PHASE SHIFTER SURROUND CONTROL Control Data PHASE SHIFTER SURROUND D0 D8 D7 L L L H H L H
ON MID HIGH Surround SW OFF Effect
* AUTO VOCAL SUPPORT SWITCH Control Auto vocal support SW Data D0 D9 L L
OFF ON
L H
LOW
H
* Keycontrol IC pass / through SW Control Remark Data D0 D10 L L H
* MICROPHONE MIXING SWITCH Control Remark Data MIC SW D0 D11
(Notice)
Correspond to external Keycontrol
L L H
OFF ON
Microphone mixing OFF Microphone mixing ON
Uncorrespond to external Keycontrol
(Notice) Please set source selecter except for "stereo" when this switch correspond to external keycontrol, because the output signal for external keycontrol (34pin:SOURCEOUT)is corresponding to only monaural signal. (This IC is not corresponding to external keycontrol,when source selecter set up "stereo".) MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT VOLUME CONTROL
* Echo effect volume attenuation Control Data D0 D3 D2 D1 L L L L H H H H H L L H H L H L H L L H H L H L H Attenuation
(dB)
* Echo FEEDBACK volume attenuation Control Data D0 D6 D5 D4 L L H L L H L L H H L L H L H L Attenuation
(dB)
+3 0 -3 -6 -9 -12 -15 -
-2 -3 -5 -7 -
* Microphone volume attenuation Control Data D9 D8 D7 MIC1 Volume Attenuation D0 (dB) D12 D11D10 MIC2 Volume L L L L H H H H H L L H H L H L H L L H H L H L H
* ADDRESS CONTROL Control Data D0 D15D14 L L L,H H H L H
Data take inside Data Cancel
ADDRESS
0 -3 -6 -9 -12 -15 -18 -
L
Data Cancel
H
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION DESCRIPTION
(1) AUTO RESET Settings are reset automatically when the IC is powered up. The reset state is automatically canceled approximately 120msec after powering up(Vcc=5V and the capacitor connected to pin C=47F). By auto reset, operation mode setting become as follows. * Delay Time Control : 104.0msec * Source Selector : stereo * Phase Shifter Surround Control : OFF * Auto Vocal support Switch : OFF * KEYCON pass/through SW :ON * Microphone Mixing Switch : OFF * Echo effect Volume : - * Echo Feed back Volume : - * Microphone Volume Attenuation : -9dB
(2) AUTO MUTE FUNCTION The IC carries out auto mute function at the time of powering up, delay time setting change, in order to suppress shock noise that the digital delay may produce. * At power up
Reset Time
Mute time (400msec)
* At delay time setting change Delay signal before change
Delay signal after change
Mute time (400msec)
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(3) Clock oscillator circuit This IC incorporates a current control type clock oscillator circuit in it, thus providing circuit configuration just by connecting an Rc for current control pin 2 (MCLKCONT). Fully internal clock supply prevents occurrence of undesired radiation without affecting any external circuit. The oscillator frequency fck is following. fck = 2 MHz(Rc=56K)
Rc
DC Current 2 Clock oscillator circuit
Clock frequency:fck
(4) Microphone amplifier The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed as follows. REF 1 R1+1.5K+334K fcl= Gv=20log * 2 * (R1+1.5K) * C1 R1+1.5K 10k(typ) 1F 4 MIC Gv(max)=47dB,fcl=48.2Hz R1=0,C1=2.2F 10K 334k Assuming Gv=37dB, fcl=15.1Hz,for instance, the constants take the following values. R1=3.3K,C1=2.2F 1.5k
6 7
R1 C1
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(5)ALC level diagram
Vo(dBV) ALC OPERATING VOLTAGE SETTING RANGE 10 +3 0 -10 -20 MICROPHONE AMPLIFIER GAIN SETTIG=47dB -30 -70 -60 -50 -40 -30 -20 -10 Vi(dBV)
(6)ALC operating voltage setting ALC operating voltage can be set at a desired value between -10dBV and +3dBV by varying the DC voltage applied to pin 3 (ALC operating voltage setting terminal). (Setting method)
1
2.5V( 2 Vcc) INTERNAL DC BIAS ONE SIDE PEAK VOLTAGE,Vpo VOLTAGE APPLIED TO 35 PIN,VALC VALC= OV
1 2
Vcc-Vpo
Vcc 51k
To set ALC operating voltage at -5dB(Vcc=5V) -5dBV=0.56Vrms=1.59Vp-p=0.8Vp-o VALC=2.5-0.8=1.7V Since the input impedance at pin 5 10 is high at 1M or more, it is possible to provide ALC operating voltage by dividing resistance. When Vcc=5V ALC operating voltage (dBV) +3 0 -2 -4 -6 -8 -10 Voltage applied to pin 5 10 VALC(V) 0.50 1.09 1.38 1.61 1.79 1.94 2.05
MITSUBISHI ELECTRIC
3 R
*
0.01
Resistance R() 5.6k 15k 20k 24k 27k 33k 36k
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(7) Input and output LPF for the digital echo The input and output LPF for the digital echo are configured as shown. figure below. C2:1000pF 2.2 C1:4700pF
14 15 16 17
24k 24k Input 24k Output
The accuracy of the internal resistance of the IC is approximately 30% Cut-off frequency(fc) is given as follows. fc= 1 2 x 24k x C1xC2
=
1 2 x24k x 4700pF x1000pF
. =3.1KHz .
Quality factor (Q) is given by the following equation for long echo. Q= 1 3 C1 . =0.72 . C2 (Figure of 0.7 is recommended)
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(8) Auto vocal support If you can not continue sing a song, the reference vocal from the source will support you automatically.
Signal Detection
Source selector mode Stereo Rch monaural (L+R)/2 same as above
On
Lch monaural
vocal cut
Off
(L+R)/2
(L+R)/2
The timing of microphone input signal detection Reference level (REF+20mV)
Microphone Volume input
level output
release time 1.5s
attack time 40ms
microphone signal detection
On
OFF
On
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(9) Vocal cut support The sound components of the same phase and same sound volume in the L and R channels are attenuated. This made also allows components with lower frequency than the vocal band to pass through the filter, to compensate insufficient low-frequency sound. Lch INPUT
vocal cut block
Rch INPUT 37 C 0.15
OUTPUT
=53.0Hz 2CR LPF is formed by the internal R (20k) and the external C, where C=0.15F , cut off frequency is 53Hz.
fvc=
1
(10)Following is the phase shifter block, which makes phase surround effect.
Lch INPUT
Phase Shifter Surround Circuit
38 C(external)=0.022F 39
Lch OUTPUT
Rch INPUT Rch OUTPUT
Source selector L R (L+R)/2 Vocal cut Stereo
Surround
Simulated Stereo
Stereo Surround
MITSUBISHI ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65856SP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
APPLICATION EXAMPLE
KEY CONTROL M65847FP/SP
Vcc
100 0.0047 0.022 0.15 1 0.1
NP
1 1 1 2.2
K
0.001
K
0.068
K
0.1
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23 22 VCC GND
-COM I/F
PHASE SHIFTER SURROUND
LPF
(L+R) / 2 L R STEREO
D/A
MIC SW
ECHO VOL
ECHO F.BVOL
16kbit SRAM
MAIN LOGIC
MCLK ALC
MIC VOL ALC
MIC VOL LPF A/D
1/2Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
56k
47 4.7 2.2 1.0 4.7 2.2 1.0 1.0 2.2
MIC SW Vcc Vcc
1.0
NP NP
0.001 0.0047
0.068
K
K
0.1
NP
10 k
K
10 k
51k
MIC1IN
MIC2IN Unit R: C: F
0.01
22k
MITSUBISHI ELECTRIC

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