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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
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23 22 VCC GND
µ-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
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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 nois.