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 RECOMMENDED OPERATING CONDITION Supply voltage range • • • • • • • • Vcc = 4.5 ~ 5.5V Rated supply voltage • • • • • • • • • • • • • Vcc = 5V PIN CONFIGURATION MIC SW 1 42 DATA MCLKCONT 2 41 CLOCK VALC 3 40 LATCH MIC1IN 4 39 PS2 ALC1 5 38 PS1 MIC1NFIN 6 37 VCFIL MIC1OUT 7 36 LOUT MIC1VOLIN 8 35 ROUT MIC2IN 9 34 SOURCEOUT ALC2 10 33 KEYCONIN MIC2NFIN 11 32 RIN MIC2OUT 12 31 LIN MIC2VOLIN 13 30 VOL IN MICOUT 14 29 LPF2OUT LPF1IN1 15 28 LPF2IN2 LPF1IN2 16 27 LPF2IN1 LPF1OUT 17 26 DAINTOUT ADINTOUT 18 25 DAINTIN ADINTIN 19 24 DACONT ADCONT 20 23 VCC REF 21 22 GND SYSTEM CONFIGURATION KEY CONTROL IC M65847FP SOURCE SELECTOR L Lch INPUT VOCAL CUT ALC MIC VOL MIC1 MIC2 MIX MIX ECHO ALC MIC VOL Lch OUTPUT MIX Rch OUTPUT PHASE SHIFTER SURROUND R (L+R)/2 Rch INPUT MIX ECHO VOL FEEDBACK VOL MITSUBISHI ELECTRIC MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT PIN CONFIGURATION 42 41 µ-COM 40 39 38 37 36 35 34 PHASE SHIFTER SURROUND I/F 33 32 31 30 29 28 27 26 (L+R) / 2 24 23 22 VCC GND D/A LPF L 25 R STEREO MIC SW ECHO VOL ECHO F.BVOL 16kbit SRAM MAIN LOGIC MIC VOL MCLK ALC 1 2 3 4 5 1/2Vcc MIC VOL LPF ALC 6 7 8 9 10 11 12 MITSUBISHI ELECTRIC 13 14 15 16 A/D 17 18 19 20 21 MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT PIN DESCRIPTION Pin No. Symbol Name I/O Microphone SW I Clock control – Function L: MIC OFF H: MIC ON 1 MIC SW 2 MCLKCONT 3 VALC 4 MIC1IN 5 ALC1 6 MIC1NFIN Microphone 1 negative feedback input I 7 MIC1OUT Microphone 1 output O 8 MIC1VOLIN Microphone 1 volume input I To connect capacitor to reduce noise generated at time of volume change 9 MIC2IN Microphone 2 input I To connect MIC2 ALC operating voltage setting terminal To set ALC operating voltage according – to applied voltage Microphone 1 input ALC1 control I To connect MIC1 To connect ALC1 attack / recovery time – setting capacitor To connect low cut-off frequency of MIC1 amplifier setting capacitor To connect ALC2 attack/recovery time 10 ALC2 11 MIC2NFIN Microphone 2 negative feedback input I 12 MIC2OUT Microphone 2 input I 13 MIC2VOLIN Microphone 2 volume input I 14 MICOUT Microphone output 15 LPF1IN1 Low pass filter 1 input 1 I 16 LPF1IN2 Low pass filter 1 input 2 I 17 LPF1OUT Low pass filter 1 output O 18 ADINTOUT A/D integrator output O 19 ADINTIN A/D integrator input I 20 ADCONT A/D control 21 REF ALC2 control Controls built-in clock generation circuit with external R – setting capacitor To connect low cut-off frequency of MIC2 amplifier setting capacitor To connect capacitor to reduce noise generated at time of volume change O Mixing output of MIC1 and MIC2 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 Reference power output – 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 Name I/O Ground – Function 22 GND 23 VCC Power supply – 24 DACONT D/A control – 25 DAINTIN D/A Integrator input I 26 DAINTOUT D/A integrator output O 27 LPF2IN1 Low pass filter 2 input 1 I 28 LPF2IN2 Low pass filter 2 input 2 I 29 LPF2OUT Low pass filter 2 output O 30 VOLIN Echo effect / Echo feed back volume input I To connect capacitor to reduce noise generated at time of volume change 31 LIN Lch line input I Lch line input 32 RIN Rch line input I Rch line input 33 KEYCONIN 34 SOURCEOUT 35 ROUT Rch output O Rch mixing output 36 LOUT Lch output O Lch mixing output 37 VCFIL Vocal cut filter – Processes frequencies lower than the vocal band 38 PS1 Phase shift input 1 I monaural input for external KEYCONTROL IC monaural output for external KEYCONTROL IC I 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 input/output interface terminal for external KEYCONTROL IC O Determines a constant at time of phase shift 39 PS2 40 Phase shift input 2 I LATCH LATCH I Latch input via serial bus 41 CLOCK CLOCK I Clock input via serial bus 42 DATA DATA I 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=25°C Unless otherwise noted) Limits Symbol Parameter Test conditions Min Typ Max Unit Icc Circuit current No signal provided – 40 88 mA Gvo Amplifier gain Vo = -17dBV 44 47 50 dB THD1 Distortion Vo = -17dBV,with ALC not operated – 0.5 1.5 % THD2 Distortion Vi= -37dBV,with ALC operated – 3.0 6.0 % VoALC ALC operating voltage measurement error measurement : -10 to +3dBV -3 0 +3 dB TALCAT ALC attack time C=4.7µF 25 40 55 msec TALCRE ALC recovery time C=4.7µF 1.0 1.5 2.0 sec VoMAX Maximum output voltage THD=10% 1.3 1.4 – Vrms No Output noise voltage – -68 -57 dBV Zi Input impedance 5 10 20 KΩ Gv I/O voltage gain Volume max -3 0 +3 dB ATTmax Maximum attenuation Volume min – -72 -67 dBV THD Distortion Volume max – 0.15 0.30 % ViMAX Maximum input voltage THD=10% 1.4 1.7 – Vrms Output noise voltage JIS - A – -96 -90 dBV Volume max -3 0 +3 dB ATTmax Maximum attenuation Volume min – -72 -67 dBV THD Distortion Volume max – 0.15 0.30 % VoMAX Maximum output voltage THD=10% 1.1 1.4 – Vrms Output noise voltage – -96 -90 dBV No Gv No I/O voltage gain Gv=47dB,f=100 to 5KHz JIS - A MITSUBISHI ELECTRIC MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT Min Limits Typ Max Unit -3 0 +3 dB 1.1 1.4 – Vrms 88.4 104.0 119.6 msec 117.9 138.7 159.5 msec 132.6 156.0 179.4 msec 176.9 208.1 239.3 msec Td=104.0mS,30KHzLPF – 1.0 2.0 % Td=138.7mS,30KHzLPF – 1.5 3.0 % Td=156.0mS,30KHzLPF – 1.5 3.0 % Td=208.1mS,30KHzLPF – 2.0 4.0 % – -87 -72 dBV – -85 -70 dBV – -85 -70 dBV – -82 -67 dBV -3 0 +3 dB – 0.02 0.04 % VoMAX Maximum output voltage THD=10% 1.1 1.7 – Vrms No Output noise voltage JIS - A,MIC SW OFF – -95 -90 dBV CS Channel separation Lin=1kHz,Vi=1Vrms,Rout JIS - A – -70 -50 dB Zi Input impedance 13 20 32 KΩ Grej Vocal removal ratio 14 18 – dB Symbol Parameter Test conditions Gv I/O voltage gain VoMAX Maximum output voltage THD=10% Td THD No Delay Time Sets Delay time with microcomputer. Distortion Output noise voltage Vi=0mVrms,JIS - A Td=104.0msec,Rg=620Ω Vi=0mVrms,JIS - A Td=138.7msec,Rg=620Ω Vi=0mVrms,JIS - A Td=156.0msec,Rg=620Ω Vi=0mVrms,JIS - A Td=208.1msec,Rg=620Ω Gv THD I/O voltage gain Distortion 30KHzLPF Vocal cut MITSUBISHI ELECTRIC MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT ABSOLUTE MAXIMUM RATINGS Symbol Name Test conditions Ratings Units Vcc Supply voltage 6.0 V Vi Circuit current -0.3 ~ Vcc+0.3 V Pd Input Voltage 1.1 W -20 ~ +75 °C -40 ~ +125 °C Topr Tstg Operating temperature Storage temperature RECOMMENDED OPERATING CONDITION Limits Symbol Parameter Test conditions Units Min Typ Max 4.5 5 5.5 V Vcc Supply voltage VIL L input level pin40,41,42 0 – 0.8 V VIH H input level pin40,41,42 2.4 – VDD V 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 41 CLOCK 42 DATA D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 time DATA FUNCTION D0 D1 Digital D2 echo DATA Control description Creates four kinds of delay signals between 104.0msec and 208.1msec. Source D5 selector D6 Desired audio source operation to each "karaoke" software can be selected by the Source selector. 5 kinds D7 Phase shifter D8 surround Surround is formed with phase shifter to increase the ambience of sound even when karaoke is used. Auto vocal D9 support ON / OFF 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. 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. D12,D13 D14 ADDRESS D15 Control description D0 D1 D3 D4 FUNCTION Echo D2 effect Volume D3 Sets volume attenuation in 8 steps between +3dB ~ -15dBand -∞. D4 Echo Feed D5 Back D6 Volume Sets volume attenuation in 5 steps between -2dB ~ -7dB and -∞. D7 D8 MIC1 Volume Sets volume attenuation in 8 steps between 0dB ~ -18dB and -∞. MIC2 Volume Sets volume attenuation in 8 steps between 0dB ~ -18dB and -∞. ADDRESS Data is taken inside D14=[L],D15=[H],and others cancel. D9 D10 D11 D12 D13 TEST mode Data is taken inside D14=[L],D15=[H],and others cancel. MITSUBISHI ELECTRIC D14 D15 MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT FUNCTION CONTROL • SOURCE SELECTOR • DELAY TIME CONTROL Control Data D0 D3 D2 D1 Control Data Delay time Source select D0 D6 D5 D4 L L – 104.0msec L L L Lch, monaural L H – 138.7msec L L H Rch, monaural H L – 156.0msec L H (L+R) / 2 H H L 208.1msec H L Vocal cut H H H Delay off mode H H Stereo L L • PHASE SHIFTER SURROUND CONTROL Control Data PHASE SHIFTER SURROUND D0 D8 D7 Surround SW L OFF L Effect • AUTO VOCAL SUPPORT SWITCH Control Auto vocal support SW Data D0 D9 L OFF H ON L L H H L H H LOW L ON • Keycontrol IC pass / through SW Control Remark Data D0 D10 L MID HIGH • MICROPHONE MIXING SWITCH Control Remark Data MIC SW D0 D11 (Notice) Correspond to external Keycontrol L L OFF Microphone mixing OFF H ON Microphone mixing ON L H 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 • Echo FEEDBACK volume attenuation Control Data Attenuation Control Data Attenuation D0 D3 D2 D1 (dB) D0 D6 D5 D4 (dB) L L L +3 L L L -2 L L H 0 L L H -3 L H L -3 L H L -5 L H H -6 L H H -7 H L L -9 H L L -∞ H L H -12 H H L -15 H H H -∞ H H • Microphone volume attenuation Control Data D9 D8 D7 MIC1 Volume Attenuation D0 (dB) D12 D11D10 MIC2 Volume L L L 0 L L H -3 L H L -6 L H H -9 H L L -12 H L H -15 H H L -18 H H H -∞ • ADDRESS CONTROL Control Data ADDRESS D0 D15D14 L L Data Cancel L H H L Data take inside H H Data Cancel L,H 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=47µF). 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=56KΩ) 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 • 2π • (R1+1.5K) • C1 R1+1.5K 10kΩ(typ) 1µF 4 MIC Gv(max)=47dB,fcl=48.2Hz R1=0Ω,C1=2.2µF 10KΩ 334kΩ Assuming Gv=37dB, fcl=15.1Hz,for instance, the constants take the following values. 1.5kΩ 6 R1=3.3KΩ,C1=2.2µF 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 To set ALC operating voltage at -5dB(Vcc=5V) Vcc 51k -5dBV=0.56Vrms=1.59Vp-p=0.8Vp-o VALC=2.5-0.8=1.7V • 3 R Since the input impedance at pin 5 10 is high at 1MΩ 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 Resistance R(Ω) 5.6k 15k 20k 24k 27k 33k 36k 0.01µ 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 µ C1:4700pF 15 14 17 16 24kΩ 24kΩ 24kΩ Input Output The accuracy of the internal resistance of the IC is approximately ±30% Cut-off frequency(fc) is given as follows. fc= 1 2π x 24kΩ x C1xC2 = 1 2π x24kΩ 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 On Lch monaural vocal cut Off (L+R)/2 (L+R)/2 Stereo Rch monaural (L+R)/2 same as above The timing of microphone input signal detection Reference level (REF+20mV) Microphone Volume input level output release time 1.5s microphone signal detection attack time 40ms OFF On MITSUBISHI ELECTRIC On 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 OUTPUT Rch INPUT 37 C 0.15µ 1 fvc= =53.0Hz 2πCR LPF is formed by the internal R (20kΩ) and the external C, where C=0.15µF , cut off frequency is 53Hz. (10)Following is the phase shifter block, which makes phase surround effect. Phase Shifter Surround Circuit Lch INPUT Lch OUTPUT 38 C(external)=0.022µF 39 Rch INPUT Rch OUTPUT Surround Source selector L R Simulated Stereo (L+R)/2 Vocal cut Stereo Stereo Surround MITSUBISHI ELECTRIC MITSUBISHI SOUND PROCESSOR ICs M65856SP DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT APPLICATION EXAMPLE KEY CONTROL M65847FP/SP Vcc 100µ 0.1µ 0.0047µ 0.022µ 42 41 40 38 39 1µ 0.15µ 37 1µ 35 36 1µ 1µ 34 PHASE SHIFTER SURROUND µ-COM I/F K K 0.001µ 0.068µ NP 33 2.2µ 31 32 30 29 28 27 26 L R 0.1µ 25 24 23 22 VCC GND D/A LPF (L+R) / 2 K STEREO MIC SW ECHO VOL ECHO F.BVOL 16kbit SRAM MAIN LOGIC MIC VOL MCLK ALC 1 2 4 3 5 1/2Vcc MIC VOL LPF ALC 6 8 7 10 9 11 12 13 14 15 16 A/D 17 18 19 56k 47µ MIC SW 2.2µ 1.0µ 2.2µ 4.7µ 4.7µ Vcc 2.2µ 1.0µ NP 1.0µ NP 1.0µ NP 0.001µ 0.0047µ K 0.068µ K 0.1µ K Vcc 10 k 51k 0.01µ 20 MIC1IN 10 k MIC2IN Unit R: Ω C: F 22k MITSUBISHI ELECTRIC 21