Single-Chip Voice Recording Playback Device 60-Second Duration Fe

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Single-Chip Voice Recording Playback Device 60-Second Duration Fe

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APR9600
Single-Chip Voice Recording Playback Device 60-Second Duration
Features Single-chip, high-quality voice recording playback solution external required Minimum external components Non-volatile Flash memory technology battery backup required User-Selectable messaging options
Random access multiple fixed-duration messages
User-friendly, easy-to-use operation Programming development systems required Level-activated recording edge-activated play back switches power consumption Operating current: typical Standby current: typical Automatic power-down Chip Enable simple message expansion
Sequential access multiple variable-duration messages
General Description
APR9600 devi offers true single-chip voice recording, non-volatile storage, playback capability seconds. device supports both random sequential access multiple messages. Sample rates user-selectsi able, allowing designers customize their design unique quality storage time needs. Integrated output amplifier, microphone amplifier, circuits greatly mplify system design. device ideal portable voice recorders, toys, many other consumer industrial applications.
APLUS integrated achieves these high levels storage capability using proprietary analog/multilevel storage technology implemented advanced Flash non-volatile memory process, where each memory cell store voltage levels. This technology enables APR9600 device reproduce voice signals their natural form. eliminates need encoding compression, which often introduce distortion.
Pinout Diagram Figure APR9600 Pinout Diagram
essage /M2_Next 2_Next /M33 /M44 /M55 /M66 OscR /M7_END ption /M8_Option /Busy /Busy VSSD VSSA
/RE/RE ExtCIK ExtClk SEL2 MSEL2 SEL1 MSEL1 /Strobe /Strobe Ana_O Ana_Out Ana_In Ana_In MicRef icIn Micln VCCA SPSP-
Update:2002/11/05
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APLUS
Functional Description
APR9600 block diagram included order give understanding APR9600i internal architecture. left hand side diagram analog inputs. differential microphone amplifier, including integrated AGC, included on-chip applications requiring use. amplified microphone signal into device connecting Ana_Out Ana_In through external blocking capacitor. Recording directly into Ana_In through blocking capacitor, however, connection between Ana_In Ana_Out still required playback. next block encountered input signal internal anti-aliasing filter. filter automatically adjusts response according sampling frequency selected Shannon's Sampling Theorem satisfied. After anti-aliasing filtering accomplished signal ready clocked into memory array. This storage accomplished through
APR9600
combination Sample Hold circuit Analog Write/Read circuit. These circuits clocked either Internal Oscillator external clock source. When playback desired previously stored recording retrieved from memory, pass filtered, amplified shown right hand side diagram. signal heard connecting speaker pins. Chip-wide management accomplished through device control block shown upper right hand corner. Message management controlled through message control block represented lower center block diagram. More detail actual device application found Sample Applications section. More detail sampling control found Sample Rate Voice Quality section. More detail message management device control found Message Management section.
Figure APR9600 Block Diagram
OscR ExtClk
Internal Oscillator
Device Control
/Strobe /Busy MSEL1 MSEL2
Ana_In Ana_Out Automatic Gain Control (AGC) PreAmp
Anti-Aliasing Filter
Sample Hold Circuit Analog Write Read Circuits 256k Cell Flash EPROM Analog Storage Array Message Decoders Pass Filter SPSP+
MicIn MicRef
Power Supplies
Message Control
VCCA VSSD VSSA
/M1_Message /M2_Next
/M7_END
/M8_Option
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Message Management
Message Management General Description Playback record operations managed chip circuitry. There several available messaging modes depending upon desired operation. These message modes determine message management style, message length, external parts count. Therefore, designer must select appropriate operating mode before beginning design. Operating modes affect voice quality; information factors affecting quality refer Sampling Rate Voice Quality section. device supports three message management modes (defined MSEL1, MSEL2 /M8_Option pins shown Figures Random access mode with fixed-duration messages
APR9600
Tape mode, with multiple variable-duration messages, provides options: Auto rewind Normal Modes cannot mixed. Switching modes after device recorded initial message recommended. modes switched after initial recording been made some unpredictable message fragments from previous mode remain present, audible playback, mode. These fragments will disappear after record operation newly selected mode. Table defines decoding necessary choose desired mode. important feature APR9600 message management capabilities ability audibly prompt user changes device's status through "beeps" superimposed device's output. This feature enabled asserting logic high level pin.
Table
Mode
Random Access fixed duration messages Random Access fixed duration messages Random Access fixed duration messages Tape mode, Normal operation Tape mode, Auto rewind operation
MSEL1
MSEL2
/M8_Option
Pull this through 100K resistor Pull this through 100K resistor Becomes message trigger input
Random Access Mode Random access mode supports messages segments fixed duration. suggested recording playback made randomly selected messages. length each message segment total recording length available defined selected sampling rate) divided total number segments enabled decoded Table1). Random access mode provides easy indexing message segments.
assume other modes. random access mode these pins should considered purely message trigger pins with same functionality /M3, /M4, /M5, /M6. more thorough explanation functionality device pins different modes please refer description table that appears later this document. When actual recording begins device responds with single beep high enable beep tone) speaker outputs indicate that started recording. Recording continues long message stays low. rising edge same message trigger during record stops recording operation (indicated with single beep). message trigger held beyond maximum allocated duration, recording stops automatically (indicated with beeps), regardless state message trigger pin. chip then enters low-power mode until message trigger returns high. After message trigger returns high, chip enters standby mode. subsequent high transition same message trigger will initiate recording from beginning same
Functional Description Recording Random Access Mode power device ready record play back, enabled message segments. record, must enable device must enable recording. initiate recording applying level message trigger that represents message segment intend use. message trigger pins labeled /M1_Message /M8_Option pins (excluding message segments respectively.
Note: Message trigger pins /M1_Message, /M2_Next, /M7_END, /M8_Option, have expanded names represent different functionality that these pins
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS
message segment. entire previous message then overwritten message, regardless duration message. Transitions other message trigger during record operation ignored until after device enters standby mode.
APR9600
clock, regardless state /M1_Message pin. device returns standby mode when /M1_Message goes high again. After recording finished device will automatically rewind beginning most recently recorded message wait next user input. auto rewind function convenient because allows user immediately playback review message without need rewind. However, caution must practiced because subsequent record operation will overwrite last recorded message unless user remembers pulse /M2_Next order increment device past current message. subsequent falling edge /M1_Message starts record operation, overwriting previously existing message. preserve previously recorded message using /M2_Next input initiate recording next available message segment. perform this function, /M2_Next must pulled least cycles sample clock. auto rewind mode allows user record over previous message simply initiating record sequence without first toggling /M2_Next pin. record over other message however requires different sequence. must pulse once rewind device beginning voice memory.The /M2_Next must then pulsed specified number times move start message wish overwrite. Upon arriving desired message record sequence initiated overwrite previously recorded material. After overwrite message becomes last available message previously recorded messages following this message become inaccessible. during record operation available memory used device will stop recording automatically, (double beep) /M7_END duration equal 1600 cycles sample clock. Playback initiated this last message, pulsing /M2_Next will device into "overflow state". Once device enters overflow state subsequent pulsing /M1_Message /M2_Next will only result double beep setting /M7_END duration equal cycles sample clock. proceed from this state user must rewind device beginning memory array. This accomplished toggling cycling power. inputs, except pin, ignored during recording.
Functional Description Playback Random Access Mode power device ready record playback, enabled message segments. playback, must enable device must high disable recording enable playback. initiate playback applying high edge message trigger that representing message segment intend playback. Playback will continue until message reached. high edge occurs same message trigger during playback, playback current message stops immediately.
different message trigger pulses during playback, playback current message stops immediately (indicated beep) playback message segment begins. delay equal 8,400 cycles sample clock will encountered before device starts playing message. message trigger held low, selected message played back repeatedly long trigger stays low. period silence, duration equal 8,400 cycles sampling clock, will inserted during looping indicator user transition between beginning message. Tape Mode Tape mode manages messages sequentially much like traditional cassette tape recorders. Within tape mode options exist, auto rewind normal. Auto rewind mode configures device automatically rewind beginning message immediately following recording playback message. tape mode, using either option, messages must recorded played back sequentially, much like traditional cassette tape recorder.
Function Description Recording Tape Mode using Normal Option power device ready record play back, starting first address memory array. record, must enable device must enable recording. falling edge /M1_Message initiates voice recording (indicated beep). subsequent rising edge /M1_Message during recording stops recording (also indicated beep). /M1_Message held beyond available memory, recording will stop automatically (indicated beeps). device will then assert logic /M7_END duration equal 1600 cycles sam-
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Function Description Playback Tape Mode using Normal Option power-up, device ready record play back, starting first address memory array. Before begin playback, input must enable device must high disable recording enable playback. first high going pulse /M1_Message initiates playback from beginning current message; power first message current message. When /M1_Message pulses second time, playback current message stops immediately. When /M1_Message pulses third time, playback current message starts again from beginning. hold /M1_Message continuously same message will play continuously looping fashion. 1,530 period silence inserted during looping indicator user transition between beginning message.
Note that auto rewind mode device always rewinds beginning current message. listen subsequent message device must fast forwarded past current message next message. This function accomplished toggling /M2_Next from high low. pulse must least cycles sampling clock. After device incremented desired message user initiate playback message with playback sequence described above. special case exists when /M2_Next goes during playback. Playback current message will stop, device will beep, advance next message initiate playback next message. (Note that /M2_Next goes when playback mode, device will prepare play next message, will actually initiate playback). goes during playback, playback current message will stop, device will beep, reset beginning first message, wait subsequent playback command. When reach memory array, subsequent pulsing /M1_Message /M2_Next will only result double beep. proceed from this state user must rewind device beginning memory array. This accomplished toggling cycling power.
APR9600
beyond available memory, recording stops automatically, beeps inserted; regardless state /M1_Message pin. device returns standby mode when /M1_Message returned high. subsequent falling edge /M1_Message starts record operation memory array immediately following last recorded message, thus preserving last recorded message. record over previous messages must pulse once reset device beginning first message. then initiate record sequence, described above, record message. most recently recorded message will become last recorded message previously recorded messages following this message will become inaccessible. wish preserve current messages recommend that Auto Rewind option used instead Normal option. Normal option necessary following sequence used. preserve current messages must fast forward past messages want keep before record message. fast forward when using Normal option must switch play mode listen messages sequentially until arrive beginning message wish overwrite. this stage should switch back record mode overwrite desired message. most recently recorded message will become last recorded message previously recorded messages following this message will become inaccessible. inputs, except ignored during recording.
Functional Description Recording Tape Mode using Auto Rewind Option power-up, device ready record play back, starting first address memory array. Before begin recording, input must enable device must enable recording. falling edge /M1_Message device will beep once initiate recording. subsequent rising edge /M1_Message will stop recording insert single beep. /M1_Message held
Functional Description Playback Tape Mode using Auto Rewind Option power-up, after high transition device ready record play back starting first address memory array. Before begin playback messages, input must enable device must high enable playback. first high going pulse /M1_Message initiates playback from beginning current message. When /M1_Message pulses from high second time, playback current message stops immediately. When /M1_Message pulses from high third time, playback next message starts again from beginning. hold /M1_Message continuously, current message subsequent messages play until following conditions met: memory array reached, last message reached, /M1_message released. last recorded message already played, further transitions /M1_Message will initiate double beep warning /M7_END will low. exit this state must pulse once during standby reset pointer beginning first message.
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS
Microprocessor Controlled Message Management
APR9600 devi incorporates several features designed help simplify microprocessor controlled message management. When controlling messages microprocessor essentially toggles pins described message management sections describe previously. /Busy, /Strobe, /M7_END pins included simplify handshaking between microprocessor APR9600 /Busy when indicates host processor that device busy that commands currently accepted. When this high device ready accept execute commands from host. /Strobe pulses each time memory segments used. Counting pulses this enables host processor accurately determine much recording time been used, much recording time remains. APR9600 total eighty memory segments. /M7_END used indicator that device stopped current record playback operation. During recording going pulse indicates that memory been used. During playback pulse indicates that last message played. Microprocessor control also used link several APR9600 devices together order increase total available recording time. this application both speaker microphone signals connected parallel. microprocessor will then control which device currently drives speaker enabling disabling each device using their respective pins. continuous message recorded multiple devices however because transition from device next will incur delay that noticeable upon playback. this reason recommended that message boundaries device boundaries always coincide.
APR9600
Higher sampling rates increase bandwidth hence voice quality, they also more memory cells same length recording time. Lower sampling rates fewer memory cells effectively increase duration capabilities device, they also reduce incoming signal bandwidth. APR9600 accommodates sampling rates high kHz. control quality/duration trade controlling sampling frequency. internal oscillator provides APR9600 sampling clock. Oscillator frequency changed changing resistance from OscR GND. Table summarizes resistance values corresponding sampling frequencies, well resulting input bandwidth duration.
Table
Rosc
Reference Rosc Value Sampling Frequency
Sampling Frequency Input Bandwidth Duration
NOTICE: Rosc table above reference only,different lots will have somewhat different Rosc value performance.
Signal Storage
APR9600 samples incoming voice signals stores instantaneous voltage samples non-volatile FLASH memory cells. Each memory cell support voltage ranges from levels. These discrete voltage levels equivalent 8-bit (28=256) binary encoded values. During playback stored signals retrieved from memory, smoothed form continuous signal, then amplified before being external speaker.
Sampling Rate Voice Quality
According Shannon's sampling theorem, highest possible frequency component introduced input sampling system must equal less than half sampling frequency aliasing errors eliminated. APR9600 automatically filters input, based selected sampling frequency, meet this requirement.
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Sampling Application
following reference schematics included examples recording system might designed. Each reference schematic shows device incorporated its' three main modes, Random Access, Tape mode Normal option, Tape mode Auto Rewind option. Note that several applications either /Busy, /Strobe, /M7_END pins connected LEDs indicators device status. This possible because these pins signals were designed have timing compatible with both microprocessor interface manual indication. Figure shows device configured tape mode, normal operation. This mode minimal part count
APR9600
application APR9600 Sampling rate determined resistor value (OscR). network sets "attack time". bias must applied electret microphone order power built circuitry. ground return this bias network connected normally open side record push button. This configuration gates power microphone that biased only during recording. This configuration saves power when recording shutting power electret microphone. Both pins MicIn MicRef, must couple microphone network order block biasing voltage.
Figure Tape Mode, Normal Option
APR9600
Play Record Trigger
skip next message switch
essage 7_EN ption /Busy VSSD VSSA
ExtC SEL2 SEL1 /Strobe Ana_O Ana_In icIn
0.1µF 0.1µF 22µF 0.1µF Flashing record play Indicator 0.1µF Slide action record playback switch
Indicator Busy Indicator
Rewind switch
4.7µF 4.7k
Electret Microphone
4.7k
22µF
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS
Figure shows device configured tape mode, using auto rewind option. Auto rewind convenient systems designed store multiple messages. Auto rewind option does slightly increase parts count above that required nor-
APR9600
option Busy pin, /Strobe, /M7_END again connected LEDs offer indication user device status.
Figure Tape Mode, Auto Rewind Option
APR9600
Play Record Trigger Skip next message switch Indicator Busy Indicator
essage 7_EN ption /Busy VSSD VSSA
ExtC SEL2 SEL1 /Strobe Ana_O Ana_In icIn
0.1µF 0.1µF 22µF 0.1µF Electret Microphone Flashing record play Indicator 0.1µF 4.7µF 4.7k Slide action record playback itch
Rewind switch
4.7k
22µF
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Figure shows device configured random access mode. device using eight message segments, maximum available, this mode. Note that message trigger pins that used, modes with less than eight segments, Figure Random Access Mode
APR9600
left unconnected with exception /M8_Option which should pulled through 100k resistor
APR9600
message trigger message trigger message trigger message trigger message trigger message trigger message trigger message trigger Busy Indicator
essage 7_EN ption /Busy VSSD VSSA
ExtC SEL2 SEL1 /Strobe Ana_O Ana_In icIn
0.1µF 0.1µF 22µF 0.1µF Electret icrophone Flashing record play Indicator 0.1µF 4.7µF 4.7k Slide action record playback switch
Rewind itch
4.7k
22µF
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS
Descriptions Table
APR9600
Functionality Tape Mode
Name /M1_Messsage
Functionality Random Access Mode Message This forces jump message either recording playback. Message This forces jump message either recording playback. Message This forces jump message either recording playback. Message This forces jump message either recording playback Message This forces jump message either recording playback. Message This forces jump message either recording playback. Oscillator Resistor: this input allows external resistor connected tank circuit internal oscillator. Refer table list resistors their resultant sampling rates. Message This forces jump message either recording playback.
Normal Option Message: edge this plays records next message.
Auto Rewind Option Message: edge this plays records current message.
/M2_Next
Next Message: This active input This should left unconnected forces skip next message when device used this either playback recording
mode.
This should left unconnected when device used this mode. This should left unconnected when device used this mode. This should left unconnected when device used this mode. This should left unconnected when device used this mode. Same Mode
This should left unconnected when device used this mode. This should left unconnected when device used this mode. This should left unconnected when device used this mode. This should left unconnected when device used this mode. Same Mode
OscR
/M7_END
During playback level this indicates that recorded messages have been played. During recording level this indicates that memory array reached. Option: This conjunction with MSEL1 MSEL2 sets record playback operating mode. Consult table decoding information. Same Mode
During playback level this indicates that recorded messages have been played. During recording level this indicates that memory array reached. MSEL1 MSEL2 sets record playback operating mode. Consult table decoding information. Same Mode
/M8_Option
Message This forces jump message either recording playback. This indicates that device currently busy performing internal functions neither record playback current time. this pulled high Beep enabled. this pulled beep disabled Digital Connection: Connect system ground. Analog Connection: Connect system ground.
/Busy
Same Mode
Same Mode
VSSD VSSA
Same Mode Same Mode
Same Mode Same Mode
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Descriptions
Functionality Random Access Mode Positive Output Speaker Connection: Should connected positive terminal output speaker. Total output power is.1 into ohms. speaker loads lower than ohms device damage result. Negative Output Speaker Connection: Should connected negative terminal output speaker. Analog Positive Power Supply: This connection supplies power on-chip analog circuitry. Should connected positive supply rail outlined reference schematics. Microphone Input: Should connected microphone input outlined reference schematics. Microphone Reference: Should connected microphone input outlined reference schematics. Automatic Gain Control Attack Time: time constant network connected this input determines attack time. attack time defined delay present before circuit begins adjust gain. values shown reference schematics have been optimized voice applications. Analog This must connected Ana_Out through 0.1µF Capacitor. Analog Out: This must connected Ana_In through 0.1µF Capacitor. Strobe: This indicates programming each individual recording segment. falling edge represents beginning sector. rising edge indicates that sector half full.
APR9600
Functionality Tape Mode
Name
Normal Option Same Mode
Auto Rewind Option Same Mode
Same Mode
Same Mode
VCCA
Same Mode
Same Mode
MicIn
Same Mode
Same Mode
MicRef
Same Mode
Same Mode
Same Mode
Same Mode
Ana_In
Same Mode
Same Mode
Ana_Out
Same Mode
Same Mode
/Strobe
Same Mode
Same Mode
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS
Descriptions -cont.
Name Functionality Random Access Mode Chip Select: level this enables device operation. Toggling this also resets several message management features. Mode Select1: This conjunction with MSEL2 /M8_Option sets record playback operating mode. Consult table decoding information. Mode Select2: This conjunction with MSEL1 /M8_Option sets record playback operating mode. Consult table decoding information. External Clock: This clock used instead internal clock greater programming control accuracy. When using internal clock this should tied system GND. Record Enable: this controls whether device write read mode. Logic level high read. Digital Positive Power Supply: This connection supplies power on-chip digital circuitry. Should connected positive supply rail outlined reference schematics. Normal Option Same Mode
APR9600
Functionality Tape Mode Auto Rewind Option Same Mode
MSEL1
Same Mode
Same Mode
MSEL2
Same Mode
Same Mode
ExtClk
Same Mode
Same Mode
Same Mode
Same Mode
VCCD
Same Mode
Same Mode
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Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
APLUS
Electrical Characteristics Absolute Maximum Ratings
Item
Power Supply voltage Input Voltage Storage Temperature Temperature Under Bias Lead Temperature
APR9600
following tables list Absolute Maximum Ratings, Characteristics, Analog Characteristics APR9600 device.
Symbol
VIN2 TSTG
Condition
25°C IIN<20mA <10s
-0.3 -1.0 -0.3
Unit
Characteristics
Item
Power Supply voltage Input High Voltage Input Voltage Output High Voltage Output Voltage Input Leakage Current Input Leakage Current Output Tristate Leakage Current Operating Current Consumption Standby Current Consumption ICCS
Symbol
Condition
25°C IOH=-1.6mA IOL=-4.0mA =VCC VIL=VSS VOUT=VCC VOUT=Vss Internal Clock, Load Load
-1.0
0.45
Unit
-1.0
Analog Characteristics*
Item
MicIn Input Voltage MicIn Input Resistance MicIn Gain MicIn Gain AnaIn Input Voltage AnaIn Input Resistance AnaIn Gain Output Resistance Sp+/- Output Power Voltage Amplitude across SP+/-
Symbol
GMI1 GMI2 VANI RANI GANI RAGC
Condition
AGC=2.25v AGC=3.8V AnaIn SP+/RSP+/-=16W RSP+/->16W
12.2
Unit
mVP-P
mVP-P
VP-P
Single-Chip Voice Recording Playback Device Multiple 60-Second Messages
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APLUS APR9600 Bonding Diagram Bonding Coordinates
/M2_MESSAGE VCCD
/M1_MESSAGE VCCD
ExtClk MSel2
MSel1 OscR
APR9600
/Strobe
AnaOut /M7_Overflow AnaIn /M8_Option /Busy VSSA VSSD VSSA SpVCCA VCCA MicIn MicRef
Notes
Dimensions Thickness Opening X-Axis mils Y-Axis mils 13.8 mils mils X-Axis 5450 Y-Axis 4550 (350 (110
following table list bonding coordinates APR9600 device. NOTE:All coordinates with respect center (µm).
Name
/M1_Message /M2_Next OscR /M7_Overflow /M8_Option /Busy VSSD VSSA VSSA VCCA VCCA
X-Axis
-1075 -1393 -1833 -2151 -2513 -2513 -2513 -2485 -2485 -2435 -1953 -1728 -1532 -1337 -840 1066
Y-Axis
2007 2007 2007 2007 1397 1079 -865 -1193 -1987 -1987 -2003 -1976 -1952 -1838 -1838 -1909 -1951
Name
MicIn MicRef AnaIn AnaOut /Strobe MSel1 MSel2 ExtClk VCCD VCCD
X-Axis
1708 2064 2491 2491 2491 2514 2514 2514 2121 1592 1088 -577 -757
Y-Axis
-1969 -1969 -1865 -1513 -1013 1182 1532 2007 2007 2007 2007 2007
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2002/5/10
APR9600
APR9600 RECORDING VOICE
MODE FIXED MESSAGES FIXED MESSAGES FIXED MESSAGES FIXED MESSAGES TAPE MODE -NEXT TAPE MODE AUTO Ref. ROSC MSEL-1 PIN-24 Sampling Frequency MSEL-2 PIN-25 Inoput bandwidth PIN-9 Pull-high 100KOhm Pull-high 100KOhm trigger Voice duration sec. sec. sec.
http://www.aplusinc.com.tw
APR9600
APR9600 RECORDING VOICE
MODE FIXED MESSAGES FIXED MESSAGES FIXED MESSAGES FIXED MESSAGES TAPE MODE -NEXT TAPE MODE AUTO Ref. ROSC MSEL-1 Sampling Frequency PIN-3 MSEL-2 PIN-4 Inoput bandwidth PIN-16 Pull-high 100KOhm Pull-high 100KOhm trigger Voice duration sec. sec. sec.
http://www.aplusinc.com.tw
APR9600
APR9600 line-In Type Recording Circuit:
APR9600 Approcation Circuit
Sec.(S1~S2) Sec.(S1~S4) Sec.(S1~S8)
Rec.
Off: Play Tape -Next (S1~S2) Tape -Auto (S1)
http://www.aplusinc.com.tw

Single-Chip Voice Recording Playback Device 60-Second Duration Fe

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