Analog Compander With Vocal Fader For Karaoke

Transcript

Multimedia ICs Analog compander with vocal fader for KARAOKE BA7726AS / BA7726AFS The BA7726AS and BA7726AFS are analog companders for karaoke echo systems and have internal logarithmic compression and expansion circuits, a stereo line mixer amplifier, vocal fader function, vocal detection function, microphone ALC, microphone ON / OFF switch, and output switch. When used together with the BU9252 8-bit digital delay, these ICs form a high-grade karaoke echo system with minimum components. Applications •Portable CD stereos with karaoke functions, VCRs, mini component stereo systems, LD players •1)Features Internal stereo line mixer amplifier, allowing selec- 4) Internal microphone ON / OFF switch. 5) Vocal detection. 6) Internal microphone ALC function. 7) Internal anti-popping circuit. tion of through output, left output, or right output. 2) Internal vocal elimination function, suitable for vocal faders and left and right output. 3) Echo level and loop ratio are DC-adjustable with the internal electronic volume control (EVR). •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits VCC 14 Power supply voltage Power dissipation BA7726AS Pd BA7726AFS Unit V 1250 ∗1 mW 850∗2 Operating temperature Topr – 10 ~ + 70 °C Storage temperature Tstg – 55 ~ + 125 °C ∗1 Reduced by 12.5mW for each increase in Ta of 1°C over 25°C. ∗2 Reduced by 8.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol Min. Typ. Max. Unit VCC 4.5 9.0 12.0 V 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 LINE OUT R LINE OUT L L / VF / R CTRL MUTE CTRL LINE IN R LINE IN L VF LPF1 VF LPF2 VF LPF3 GND ECHO LEVEL CTRL LOOP GAIN CTRL EXP DET EXP DET CT EXP BF IN DLY BF OUT + VOCAL DET ALC – COMPRESS VOCAL FADER SW VR + L / ST / R CTRL NO / VC CTRL VO DET VO DET LEVEL ALC DET LEVEL ALC DET MIC AMP IN MIC AMP NF BIAS VCC CMP DET CMP DET CT CMP OUT CMP BF NF IN CMP BF OUT DLY BF NF IN Multimedia ICs BA7726AS / BA7726AFS •Block diagram 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VR OUTSW – VR + – EXPAND Multimedia ICs BA7726AS / BA7726AFS •Pin descriptions Pin No. Pin name Function Voltage Pin type EF (P - P) 2, 1 LINE OUT L / R Line output (L, R) 4.5V 3 L / VF / R CTRL Line output switching (LEFT / VOCAL FADER / RIGHT) 2.5V 4 MUTE CTRL Line mute control input — ∗ ∗ 6, 5 LINE IN L / R Line input (L, R) 4.5V 100kΩ 7 VF LPF1 Vocal fader mode LPF capacitor 4.5V 23.5kΩ 8 VF LPF2 Vocal fader mode LPF capacitor 4.5V 70.5kΩ 9 VF LPF3 Vocal fader mode LPF capacitor 4.5V EF (NPN), 15kΩ 10 GND Ground 0.0V — 11 ECHO LEVEL CTRL Microphone off (ground to 0.1Vcc) / echo level adjustment (0.2Vcc to Vcc) 12 LOOP GAIN CTRL 13 EXP DET 14 EXP DET CT 15 EXP BF IN Loop attenuation ratio setting Expand detection wave Expand attack / recovery time setting Attack R = 5.6kΩ , recovery R = 85.6kΩ BF input — ∗ ∗ 4.5V 50kΩ — — 4.5V B (NPN) — 16 DLY BF OUT LPF BF output (EXP) 4.5V EF (NPN) 17 DLY BF NF IN LPF BF negative feedback input (EXP) 4.5V B (NPN) 18 CMP BF OUT LPF BF output (CMP) 4.5V EF (P - P) 19 CMP BF NF IN LPF BF negative feedback input (CMP) 4.5V B (NPN) 20 CMP OUT Compression output 4.5V EF (NPN) 21 CMP DET CT — — 22 CMP DET 4.5V 60kΩ 23 VCC 24 BIAS 25 Compression attack / recover time setting Attack R = 5.6kΩ, recovery R = 85.6kΩ Compression detection wave VCC 9.0V — Bias and capacitor for ripple rejection 4.5V 23.5kΩ MIC AMP NF Microphone amplifier negative feedback 4.5V 2kΩ 26 MIC AMP IN Microphone amplifier input 4.5V 100kΩ 27 ALC DET ALC attack / recovery time setting — 220Ω 28 ALC DET LEVEL ALC level setting — B (PNP) 29 VO DET LEVEL Microphone amplifier input detection level setting — B (PNP) 30 VO DET Microphone amplifier input detection attack / recover time setting — 1kΩ 31 NO / VC CTRL Line output switching (NORMAL / VOCAL CUT) — ∗ 32 L / ST / R CTRL Line output switching (LEFT / STEREO / RIGHT) 2.5V ∗ Note: Pin type EF: emitter follower, P-P: push-pull, B: base For pins marked with an asterisk (∗), refer to Input and output equivalent circuit. All figures are designed values based on the measurement circuit in Fig. 1 (where Vcc = 9.0V), and are not guaranteed standards. 3 Multimedia ICs BA7726AS / BA7726AFS •Input / output circuits L / VF / R CTRL MUTE CTRL VCC VCC 39k 39k 1.7V 39k 3.3V 2.5V 4 150k 3 ECHO LEVEL CTRL LOOP GAIN CTRL VCC 12 11 85k 39k 0.6 × VCC 39k 0.6 × VCC 0.8 × VCC 0.8 × VCC 15k NO / VC CTRL L / ST / R CTRL VCC VCC 49.5k 39k 31 39k 39k 3.3V 33k 32 ∗ All figures are designed values, and are not guaranteed standards. 4 1.7V Multimedia ICs BA7726AS / BA7726AFS •Electrical characteristics (unless otherwise noted, Ta = 25°C, Vcc = 9.0V) Parameter Supply current Symbol Min. Typ. Max. Unit ICC 5.5 8.4 12.7 mA No input Conditions dBV VIN = – 20.0dBV 〈LINE THROUGH〉 INPUT : LINE IN, OUTPUT : LINE OUT Line through output level VOLL – 9.0 Line through output distortion THDLL — Line through max. output level VOMLL + 7.8 Line through noise level VONLL Interchannel crosstalk Mute level – 8.0 – 7.0 0.026 0.2 % + 10.0 — dBV — – 100 – 85 dBV CTLL — – 85 — dBV MT — – 100 – 85 dBV VIN = – 20.0dBV∗1 MIC OFF (VECHO = 0.1 × VCC) THD = 1%∗1 No input, Rg = 1kΩ∗2 MIC OFF (VECHO = 0.1 × VCC) VIN – 12dBV, Rg = 1kΩ∗2 MIC OFF (VECHO = 0.1 × VCC) VIN = – 12dBV, Rg = 1kΩ∗2 MIC OFF (VECHO = 0.1 × VCC) MUTE (VMUTE = H) 〈VOCAL CUT MODE〉 INPUT : LINE IN, OUTPUT : LINE OUT Through mode output level VOLLV – 1.0 0.0 + 1.0 dBV Vocal suppression ratio 1 VOLL1 – 1.0 0.0 + 1.0 dB VIN = – 12dBV (single ch. in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN) Vocal suppression ratio 2 VOLL2 — – 35 – 28 dB VIN = – 12dBV (dual ch.in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN) VIN = – 12dBV 〈MIC THROUGH〉 INPUT : MIC AMP IN, OUTPUT : LINE OUT Microphone through output level VOML – 9.9 – 8.4 – 6.9 dBV VIN = – 38dBV Microphone through equivalent input noise VONML — – 117 – 102 dBV Rg = 1kΩ∗2 Microphone input crosstalk CTML — – 92 – 77 dBV VIN = – 30dBV∗2 MIC OFF (VECHO = 0.1 × VCC) ALC level VOAML + 5.1 + 6.6 + 8.1 dBV V28 = 2.9V dBV VIN = – 38dBV 〈COMPRESS〉 INPUT : MIC AMP IN, OUTPUT : CMP BF OUT Compress output level VOMC – 5.5 – 3.5 – 1.5 Compress characteristics CMP — + 5.2 — dB VIN = – 43dBV → – 33dBV Output level differential 〈EXPAND〉 INPUT : DLY BF IN, OUTPUT : LINE OUT Expand output level VODL – 9.4 – 7.4 — dBV Expand characteristics EXP — + 19.4 — dB VIN = – 9dBV → + 1dBV, Output level differential Echo EVR attenuation ratio ∆VODL — – 50 – 40 dB VIN = – 4dBV and when VIN = Vodl ECHO LEVEL = Min. (VECHO = 0.2 × VCC) – 4.4 – 2.4 — dBV — – 29 — dB VIN = – 4dBV 〈Loop〉 INPUT : DLY BF IN, OUTPUT : CMP BF OUT Loop output level VODC Loop EVR attenuation ratio ∗1 ∆VODC VIN = – 4dBV VIN = – 4dBV and when VIN = Vodc LOOP GAIN = Min. (VLOOP = 0.2 × VCC) Unless otherwise noted, mode settings are as follows. MUTE (VMUTE = GND), STEREO (VNOVC = GND, VLSTR = OPEN, VLVFR = OPEN) ECHO LEVEL = Max. (VECHO = VCC), LOOP GAIN = Max. (VLOOP = VCC) ∗2 Signal frequency : 1kHz, ∗1 : B.W. = 0.4 ~ 30kHz, ∗2 : DIN AUDIO All parameters conform to the Measurement circuit diagram. 5 Multimedia ICs Parameter BA7726AS / BA7726AFS Symbol Min. Typ. Max. Unit Mute holding voltage (4pin) VMUTE – L GND — 0.5 V Mute holding voltage (4pin) VMUTE – H 4.5 — 5.0 V [ Control holding voltage ] 〈MUTE CTRL (4pin)〉 〈NO / VC CTRL (31pin)〉 Normal mode holding voltage VNOVC – L GND — 0.3 × VCC V VOCAL CUT mode holding voltage VNOVC – H 0.5 × VCC — VCC V 〈L / ST / R CTRL (32pin)〉 Left mode holding voltage VLSTR – L GND — 0.5 V Stereo mode holding voltage VLSTR – M 2.2 — 2.8 V Right mode holding voltage VLSTR – H 4.5 — 5.0 V 〈L / VF / R CTRL (3pin)〉 Left mode holding voltage VLVFR – L GND — 0.5 V VOCAL FADER mode holding voltage VLVFR – M 2.2 — 2.8 V Right mode holding voltage VLVFR – H 4.5 — 5.0 V 〈ECHO LEVEL CTRL (11pin)〉 6 MIC OFF holding voltage VECHO – L GND — 0.1 × VCC V MIC ON holding voltage VECHO – H 0.2 × VCC — VCC V Conditions Multimedia ICs BA7726AS / BA7726AFS 28 VOCAL DET 26 25 24 23 4 5 0.1µ 6 VR 7 47k 10k 47k 18k 1µ + 18k CMP BF OUT DLY BF IN 1k 8 – + 9 10 EXPAND 11 12 13 14 15 16 + LINE IN L 0.068µ VLOOP 1k 0.1µ 0.47µ VECHO 1k LINE IN R VMUTE 17 + – 0.015µ VLVFR LINE OUT L LINE OUT R 10k 18 VR 0.1µ 4700p 4700p 10k 220p 19 COMPRESS + 3 20 1µ 5600p – SW 2 21 VOCAL FADER + + 2.2µ 2.2µ + + 3900p VR ALC OUTSW 1 22 18k + 0.1µ + 22µ 1µ 0.1µ 47µ + 27 39k 18k 39k 29 A 220p 30 VCC 9V MIC AMP IN 31 2.2M 1k 32 0.47µ 8.2k 6.8k 3.3k 33µ + 5600p 3900p 100µ 1k + 100k VNOVC VLSTR •Measurement circuit Fig. 1 7 Multimedia ICs BA7726AS / BA7726AFS operation •(1)Circuit MUTE CTRL (pin 4) (3) ECHO LEVEL CTRL and MIC ON / OFF SW (pin 11) • Between Vcc and 0.2 × Vcc: Controls echo signal mixing ratio Between Vcc and GND : Turns microphone input sound (pin 26) to LINE OUT on and off • Controls line muting. VMUTE (4pin) L H MUTE MUTE VECHO (11pin) VNOVC (31pin) L H NORMAL VOCAL CUT NORMAL : Normal output mode. Controlled by pin 32. VOCAL CUT : Used to erase or attenuate vocals in multiplexed karaoke recordings and normal stereo music recordings. Controlled by pin3. VCC ~ 0.2 × VCC 0.1 × VCC ~ GND MIC ON and ECHO LEVEL CTRL MIC OFF LINE OUT Attenuation. : ATT (dB) (2) OUTPUT CTRL (pins 3, 31, 32) • LINE OUT output is controlled with pins 3, 31 and 32. (Microphone mixing is controlled with pin 11.) 1) NO / VC CTRL (pin 31) • Used to select the NORMAL and VOCAL CUT modes. MIC AMP IN ~ LINE OUT (VIN = – 38dBV, f = 1kHz) 0 DLY BF IN ~ LINE OUT (VIN = – 4dBV, f = 1kHz) – 50 – 100 0 0.5 VECHO (11pin) P.P ratio : VECHO / VCC 1.0 Fig. 2 LINE OUTattenuation ratio vs. Vecho (11pin) partial pressure ratio ∗ These figures are for standard samples and 2) L / ST / R CTRL (pin 32) • Controls LINE OUT output in the NORMAL mode. LEFT L M (OPEN) H LEFT STEREO RIGHT : LINE IN L input is output to LINE OUT L / R. STEREO : LINE IN L / R input is output to LINE OUT L / R without modification RIGHT : LINE IN R input is output to LINE OUT L / R. 3) L / VF / R CTRL (pin 3) • Controls LINE OUT output in the VOCAL CUT mode. VLVFR (3pin) LEFT L M (OPEN) H LEFT VOCAL FADER RIGHT : For recordings in which the left channel is karaoke and the right channel is for vocals (with karaoke). VOCAL FADER : Attenuates the vocals from normal stereo recordings. RIGHT : For recordings in which the right channel is karaoke and the left channel is for vocals (with karaoke). ∗ When Vnovc = L, V LVFR = DON ' T CARE When Vnovc = H, VLSTR = DON ' T CARE 8 (4) LOOP GAIN CTRL (pin 12) • Adjusts the loop gain (pins 17 and 18). CMP BF OUT Attenuation. : ATT (dB) VLSTR (32pin) are not guaranteed standards. DLY BF IN ~ CMP BF OUT (VIN = – 4dBV, f = 1kHz) 0 VCC = 9.0V – 25 – 50 0 0.5 VLOOP (12pin) P.P ratio : VECHO / VCC 1.0 Fig. 3 CMP BF OUT attenuation ratio vs. Vloop (pin 12) partial pressure ratio ∗ These figures are for standard samples and are not guaranteed standards. Multimedia ICs BA7726AS / BA7726AFS (5) LPF • Use the internal operational amplifier and an attached capacitor and resistor to configure a tertiary LPF for anti-aliasing and smoothing. C1 C2 R3 R1 TO BU9252 R2 R1 C2 C3 R1 FROM BU9252 19 18 17 R2 R1 C1 R3 + – C3 + – 20 16 Fig. 4 LPF LPF constant examples (VCC = 9.0V) LPF constant Cutoff frequency R1 R2 R3 C1 C2 C3 Pass band gain 2kHz 22kΩ 56kΩ 47kΩ 6800pF 4700pF 270pF 0.6dB 3kHz 18kΩ 47kΩ 39kΩ 5600pF 3900pF 220pF 0.7dB 4kHz 15kΩ 39kΩ 33kΩ 4700pF 3300pF 180pF 0.8dB ∗ CMP OUT (pin 20) output is positively correlated with Vcc. When Vcc is a voltage other than 9.0V, set the pass band gain so that maximum CMP side LPF output (input to BU9252) is 5Vp-p. Make sure that the EXP side LPF constant does not exceed the load drive capability (minimum = 0.3mA, typical 0.5mA). (6) Vocal fader function • After the synchronous component of the left and right channels is eliminated, LPF output is added to the signal, which is then output (see figure below). The vocal component is difficult to remove from certain types of sources. – 1 × (VCC – V28) [Vrms], 2× 2 1.0 ⬉ V28 ⬉ 0.85 × (VCC – 1.0), at LINE OUT VOAML ⱌ TO OUTSW + LPF 5 6 7 8 between -4dBV and +9dBV, and is determined by the voltage impressed on pin 28 (V28, set with resistive division between Vcc and the ground). ALC level is calculated with the following equation, although slight error occurs as V28 approaches VCC. 9 C1 + 10 VCC = 9.0V C2 at LINE OUT (f = 1kHz) Fig. 5 Vocal fader block LPF constant examples Cutoff frequency LPF constant C1 C2 100Hz 0.022µF 0.1µF 150Hz 0.015µF 0.068µF 200Hz 0.01µF 0.047µF ∗ C1 and C2 are only necessary when using the vocal fader function. (7) ALC level • When Vcc is 9.0V, ALC level can be set roughly ALC LEVEL : VOAML (dBV) LINE LINE IN R IN L +5 0 Set within this range –5 – 10 0 5 Pin 28 voltage: V28 (V) 10 Fig. 6 ALC level vs. pin 28 voltage ∗ These figures are for standard samples and are not guaranteed standards. 9 BA7726AS / BA7726AFS Microphone amplifier input detection level : V ODET (dBV) Multimedia ICs (8) Microphone input detection function • This function detects the signal input to MIC AMP IN (pin 26) and outputs it to pin 30. Pin 30 output No signal input to MIC AMP IN (pin 26) GND Signal input to MIC AMP IN (pin 26) VCC – 1.0V • The detection level is determined by the voltage impressed on pin 29 (V29, set with resistive division between Vcc and the ground) and is calculated with the following equation, although slight error occurs as V28 approaches ground. Set within this range – 20 VCC = 9.0V at MIC AMP IN (f = 1kHz) – 70 5 Pin 29 voltage: V29 (V) 0 10 Fig. 7 Microphone amplifier input detection level vs. pin 29 voltage ∗ These are figures for standard samples and are not guaranteed standards. 1 × V29) [Vrms], 2× 2 0.5 ⬉ V29 ⬉ 0.85 × (VCC – 1.0), at MIC AMP IN VODET ⱌ 0.03 × ( VCC 5V LINE IN L LINE IN R 3900p 14 56k 0.068µ 10k 10k 2.7k ECHO LEVEL 18 17 16 15 14 4 TEST CIRCUIT 2 1 LOOP GAIN BA7726AFS 8bit D/A 3 16 8 0.015µ Fig.8 10 15 + 13 BU9252F f = 455kHz 13 12 12 11 11 10 10 8 × 2k SRAM 9 + ADRRESS COUNTER MAIN TIMING 8 1µ + 9 7 EXPAND 0.1µ + VR MIC ON / OFF 6 0.1µ 5 0.1µ 4 MUTE CTRL 2.2µ 2.2µ 3 L / VF / R LINE OUT L LINE OUT R 2 – – VR SW + 17 0.1µ 5 + COMPRESS 8bit A/D S and H 18k 220p 18 6 – VOCAL FADER 1 19 VR ALC OUTSW + 20 7 21 10µ 22 18k 23 5600p 24 5600p 0.47µ VCC 9V 25 47k 26 39k VOCAL DET 27 47k 220p 28 18k 3900p + 29 1µ + + 30 + 0.47µ 31 + 0.1µ 32 + 1000p 39k 18k + 47µ + 1µ 0.1µ 0.1µ L / ST / R NO / VC CTRL MIC AMP IN •Application example Multimedia ICs BA7726AS / BA7726AFS notes •(1)Operation LINE OUT (pins 1 and 2) signal processing • Be sure to attach a capacitor for phase correction to the LINE OUT pins. + 1 LINE OUT R 4700p + 2 LINE OUT L 4700p Fig. 9 (2) Setting the loop gain • Set the LPF constant and pin 12 control voltage so that the loop gain (1st echo wave / 2nd echo wave) does not exceed 1. Be particularly careful of peaking near the LPF cutoff point. (3) ALC function and microphone amplifier input detection function • Refer to items 7 and 8 in “Circuit description.” When these functions are not used, be sure to ground pins 27 and 28 (the ALC function) and pins 29 and 30 (microphone amplifier input detection function). •External dimensions (Units: mm) BA7726AS BA7726AFS 28.0 ± 0.3 13.6 ± 0.2 17 17 1 16 0.15 ± 0.1 7.8 ± 0.3 16 32 5.4 ± 0.2 1 0.3 ± 0.1 1.778 0.5 ± 0.1 SDIP32 1.8 ± 0.1 10.16 0.11 0.51Min. 3.2 ± 0.2 4.7 ± 0.3 8.4 ± 0.3 32 0.8 0.36 ± 0.1 0.3Min. 0.15 0° ~ 15° SSOP-A32 11 Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document use silicon as a basic material. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix1-Rev1.0