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RSC-300/364 Recognition * Synthesis * Control
Speech Recognition Microcontroller
GENERAL DESCRIPTION
The RSC-300/364, from the Interactive SpeechTM family of products, is an 8-bit microcontroller designed specifically for speech applications in consumer electronic products. The RSC-300/364 is a single chip solution that combines the flexibility of a microcontroller with advanced speech technology, including high-quality speech recognition, speech and music synthesis, speaker verification, and voice record and playback. Products can use one or all of the RSC-300/364 features in a single application. The RSC-300/364 supports Sensory SpeechTM 6, the latest speech recognition technology from Sensory, which includes a number of new techniques that significantly improve recognition performance over previous versions. Using a sophisticated neural network technology, on-chip speech recognition algorithms reach an accuracy of greater than 97% for speaker-independent recognition and greater than 99% for speaker-dependent recognition. In addition to the improved recognition performance, the RSC-300/364 provides further on-chip integration of features, including a preamplifier, multiplier, timer-2, and 2.5 Kbytes of RAM. A complete system may be built with few additional parts other than a battery, speaker, microphone, and a few resistors and capacitors. The RSC300 is designed for ROM-less for applications that need more ROM space and consequently use off-chip memory.
FEATURES
Full Range of Sensory SpeechTM 6 Capabilities * Speaker-independent speech recognition * Speaker-dependent speech recognition * High quality speech synthesis and sound effects * Speaker verification * Four-voice music synthesis * Voice record & playback Integrated Single-Chip Solution * 4 MIPS 8-bit microcontroller * On-chip A/D and D/A converters, and pre-amplifier * 32kHz clock for time keeping * Internal 64 Kbytes ROM; 2.5 Kbytes RAM * Secondary Timer 2 * External memory bus: 16-bit Address, 8-bit Data * 24x24 Multiplier for rapid recognition processing Low Power Requirements * 2.85 - 5.25V operation * ~10mA operating current at 3V * Power down mode; <5 A standby current
RSC-300/364 Block Diagram
Oscillator Preamp and Gain Control Microphone
Multiplexer ADC Digital Logic AGC Microcontroller
DAC RAM
AMP Speaker
ROM (RSC-364 only) Multiplier
RSC-364
Timer #2
External General Purpose I/O Memory
From the Interactive SpeechTM Line of Products
RSC-300/364
DATA SHEET
RSC-300/364 OVERVIEW
The RSC-300/364 is a member of the Interactive SpeechTM line of products from Sensory. It features a high-performance 8-bit microcontroller with on-chip A/D, D/A, preamplifier, RAM and ROM (RSC-364 only). The RSC-300/364 is designed to bring a high degree of integration and versatility into low-cost, power-sensitive toy applications. Various functional units have been integrated onto the CPU core in order to reduce total system cost and increase system reliability without degrading system performance. The RSC-300/364 delivers 4 MIPS of integer performance at 14.32 MHz providing maximum performance at minimum cost. The CPU core embedded in the RSC-300/364 is an 8-bit, variable-length-instruction, microcontroller. The instruction set is somewhat similar to the ZilogTM 78, and has a variety of addressing mode mov instructions. The RSC-300/364 processor avoids the limitations of dedicated A, B, and DPTR registers by having completely symmetrical source and destinations for all instructions. Of the 2.5 Kbytes of internal RAM, 2 Kbytes are organized as a Data Space, with 0.5K used for Register Space.
RECORD AND PLAYBACK
The RSC-300/364 can perform audio record and playback at various compression levels depending on the quantity and quality of playback desired. Data rates of under 14,000 bits per second are achievable while maintaining very high quality reproduction. The RSC-300/364 also performs silence removal to improve sound quality and reduce memory requirements.
SPEAKER VERIFICATION
The RSC-300/364 can also perform text-dependent speaker verification. After a speaker trains the chip on a specific word, the chip is able to identify whether that word is spoken by the original speaker, thus providing biometric security.
POWER
The typical operating current is 10 mA operating at 14.32 MHz and 3V. Lowering clock frequency reduces power consumption, although speech recognition requires a 14.32 MHz clock. Standby current is <5A in power down mode.
SPEECH RECOGNITION
The RSC-300/364 uses a neural network to perform speaker-independent or speaker-dependent speech recognition. Speaker-dependent recognition requires external memory to store speech recognition information (e.g., SRAM, optional Serial EEPROM, Flash Memory). Speaker-independent recognition requires on-chip or offchip ROM to store the words to be recognized. The RSC300/364 has several additional speech recognition features as described below. Continuous listening allows the chip to continuously listen for a specific word. With this feature a product can be used in a normal environment and only "activates" when a specific word, preceded by quiet, is spoken.
RSC-300/364 Architecture Diagram
AiFE1 AiFE2 AiNO AiN1 AOFE1
A[15:0] EXTERNAL MEMORY INTERFACE SPEECH PROCESSING UNIT D[7:0] -RDC -WRC -RDD -WRD
PRE-AMP
AOFE2 AOFE3
ADC
DACOUT
2K TECHNOLOGY SRAM REGISTER SPACE
448 bytes
DAC ANALOG CONTROL PULSE WIDTH MODULATOR INTERRUPT LOGIC OSC1
BUFOUT/ PWM
STACK SPACE
8 levels
XI1, XO1
CPU INTERNAL ROM (RSC-364) 32K x 8 32K x 8 -XMH
HIGH
TIMER1 TIMER2
SPEECH AND MUSIC SYNTHESIS
The RSC-300/364 provides high-quality speech synthesis by using a hybrid of a time-domain compression scheme that improves on conventional ADPCM and a customized reuse of sounds. Speech synthesis requires on-chip or offchip ROM to store audio sounds for synthesis. The RSC-300/364 provides high-quality, low-cost fourvoice music synthesis which allows multiple, simultaneous instruments for harmonizing. The RSC-300/364 uses a MIDI-like system to generate music.
XI2, XO2 OSC2
-XML
LOW
PORT 0
TIMING AND CONTROL
-RESET -TE1/ PWM
P0.0-P0.7
BREAK POINT REGISTER
P1.0-P1.7
2
From the Interactive SpeechTM Line of Products
PORT 1
DATA SHEET
RSC-300/364
RSC-300/364 ARCHITECTURE
The RSC-300/364 is a highly integrated device that combines: * * 8-bit microcontroller On-chip ROM (64 Kbytes, RSC-364 only) and RAM (2.5 Kbytes), and the ability to address off-chip RAM or ROM A/D converter and D/A converter Input amplifier and pulse width modulator
external devices. There are two programmable 8-bit counters / timers, one derived from each oscillator. An external microphone passes an audio signal to the preamplifier and ADC (Analog-to-Digital Converter) to convert the incoming speech signal into digital data. The output audio signal of the RSC-300/364 is derived from a DAC (Digital-to-Analog Converter) or PWM (Pulse Width Modulator).
* *
USING THE RSC-300/364
Creating applications using the RSC-300/364 requires the development of electronic circuitry, software code, and speech/music data files. Software code for the RSC300/364 can be developed by Sensory or by external programmers using the RSC-300/364 Development Kit. For more information about development tools and services, please contact Sensory. A typical product will require about $0.30 - $1.00 (in high volume) of additional components, in addition to the RSC-300/364. The following sample circuit provides an example of how the RSC-300/364 might be used in a consumer electronic product.
The RSC-300/364 has an external memory interface, with 16-bit addresses and 8-bit data buses, for accessing external memory. It also has an internal ROM (RSC-364 only) that can be enabled or disabled (partially or fully) by pin inputs (signals , -XMH, -XML). Two bi-directional ports provide 16 general purpose I/O pins to communicate with external devices. The RSC300/364 has a high frequency (14.32 MHz) oscillator as well as a low frequency (32,768 Hz) oscillator suitable for timekeeping applications. The processor clock can be selected from either source, with a selectable divider value. The device performs speech recognition when running at 14.32 MHz. The RSC-300/364 also supports programmable wait states to allow the use of slower
Sample Application Circuit (Die)
R1 2.7K U1 10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 1 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 D0 D1 D2 D3 D4 D5 D6 D7 11 12 13 15 16 17 18 19 VDD R7 47 C14 0.01uF C5 0.1uF C7 0.022uF INPUT-MIC /XML /XMH P DN /WRD /RDD /WRC /RDC P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 J1 C6 100uF/16V R2 100 C1 0.1uF C3 4700pF C2 220pF
C4 100uF
C14 0.01uF R3 2.7K(TBD)
LS1
SP AKE E R
PDN 20 /RDC 22
D0 D1 D2 D3 D4 D5 D6 D7 NC NC P 1/TE P 0 GND AOFE2 AIN0 AIN1 AOFE3 DAC AIFE 2
19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
D0 D1 D2 D3 D4 D5 D6 D7
CE OE AT27LV512A(TSOP)
A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 VDD
VDD
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
A15 A14 A13 A12 A11 A10 A9 A8 GND Vdd A7 A6 A5 A4 A3 A2 A1
RSC364
AOFE1 AIFE 1 Vref XML XMH P DN WRD RDD WRC RDC GND Vdd P 0.0 P 0.1 P 0.2 P 0.3 P 0.4 P 0.5
72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55
R4 100K
A0 XO2 XI2 XO1 XI1 RST NC NC P 1.7 P 1.6 P 1.5 P 1.4 P 1.3 P 1.2 P 1.1 P 1.0 P 0.7 P 0.6
VDD
C8 0.1uF
C9 68pF
P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P0.7 P0.6
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
C10 0.1uF
R6 400 VDD Y1 C13 0.1uF 14.318MHz C11 27pF C12 27 pF R5 100K
From the Interactive SpeechTM Line of Products
3
RSC-300/364
DATA SHEET
RSC-300/364 INSTRUCTION SET
The instruction set for the RSC-300/364 has 54 instructions comprising 10 move, 7 rotate, 11 branch, 11 register arithmetic, 9 immediate arithmetic, and 6 miscellaneous instructions. All instructions are 3 bytes or fewer, and no instruction requires more than 10 clock cycles to execute.
duration. Careful design may allow operation with memories having access times as slow as 120 nsec.
TIMERS/COUNTERS
The two independent oscillators of the RSC-300/364 provide counts to two internal timers. Each of the two timers consists of an 8-bit reload value register and an 8bit up-counter. The reload register is readable and writeable by the processor.
GENERAL PURPOSE I/O
The RSC-300/364 has 16 general purpose I/O pins (P0.0P0.7, P1.0-P1.7). Each pin can be programmed as an input with weak pull-up (~150k equivalent device); input with strong pull-up (~10k equivalent device); input without pull-up, or as an output.
INTERRUPTS
The RSC-300/364 allows for five interrupt sources, as selected by software. Each has its own mask bit and request bit in the IMR and IRQ registers respectively. The following events can generate interrupts:
* * * * Positive edge on Port 0, bit 0 Overflow of Timer 1 Overflow of Timer 2 Sensory reserved functions Completion of PWM sample period
EXTERNAL MEMORY
The RSC-300/364 includes an external memory interface that allows connection with memory devices for speakerdependent speech recognition, audio record/playback, and extended durations of speech and music synthesis. Separate data and address buses allow use of standard EPROMs, ROMs, SRAMs, and Flash memory with little or no additional decoding. Support for separate read and write signals for each external memory space further simplifies interfacing. The RSC-300/364 includes 8 data lines (D[7:0]) and 16 address lines (A[15:0]), and associated control signals for memory interfacing.
*
PREAMPLIFIER
The on-chip preamplifier circuit consists of three stages with a maximum overall gain of about 500. The amplifier includes a Vref input that is used to set the amplifier center voltages and must be driven by a low impedance voltage supplied by an external source. The signal inputs of all stages have an 80 K input impedance to the Vref pad. In a typical design, AOFE1 would be directly coupled to AIFE2, and AOFE2 would be capacitively coupled to AIN0 through an RC lowpass filter to remove DC offset and digital noise. AOFE3 would be bypassed to Vref with a small (220pF) capacitor for additional noise suppression.
OSCILLATORS
Two independent oscillators in the RSC-300/364 provide a high-frequency clock and a 32kHz time-keeping clock. Both oscillators work with an external crystal, a ceramic resonator or LC. The oscillator characteristics are: Oscillator #1: Oscillator #2 Pins XI1, XO1 14.32 MHz Pins XI2 and XO2 32768 Hz
ANALOG OUTPUT
The RSC-300/364 offers two separate options for analog output. The DAC (Digital to Analog Converter) output provides a general purpose 10-bit analog output that may be used for speech output (with the inclusion of an audio amplifier), or other purposes requiring an analog waveform. For speech applications that require driving a small speaker, the PWM (Pulse-Width Modulator) output can be used instead of the DAC output. The PWM output can directly drive a 32 ohm speaker.
CLOCK
The RSC-300/364 uses a fully static core - the processor can be stopped (by removing the clock source) and restarted without causing a reset or losing contents of internal registers. Static operation is guaranteed from DC to 14.32 MHz. Typically the processor clock runs from a 14.32 MHz crystal with no divisor and one wait state. This creates internal RAM cycles of 70 nsec duration and internal ROM (RSC-364 only) or external cycles of 140 nsec
PACKAGING
The RSC-300/364 can be purchased as unpackaged die or a 64 pin TQFP package.
4
From the Interactive SpeechTM Line of Products
DATA SHEET
RSC-300/364
DIE BOND PAD AND QFP PIN DESCRIPTIONS
19 20 1 72
64 1
49 48
RSC-300/364
(top view of die)
36 55 37 54
RSC-300/364
4
(64-lead TQFP) 16 17 32 33
Name
A[15:0] AIN0 AIN1 AOFE1 AOFE2 AOFE3 AIFE1 AIFE2 NC PWM0 DACOUT D[7:0] Vss PDN P1[7:0], P0[7:0] /RDC /RDD /RESET /TE1 or PWM1 VREF VDD /WRC /WRD /XMH /XML XO1 XI1 XO2 XI2
Die Pad
20-27, 30-37 5 4 72 6 3 71 1 10,11,43,44 8 2 12-19 7,28,62 67 43-52,53-60 63 65 42 9 70 29,61 64 66 68 69 40 41 38 39
QFP Pin
1-8, 11-18 52 51 49 53 51 48 49
Description
External Memory Address Bus Analog In, low gain. (range AGND to AVDD/2.) Analog In, hi gain (8X input amplitude of AIN0, same range) Output of 1 stage of preamplifier Output of 2nd stage of preamplifier Output of 3 stage of preamplifier Input of 1st stage of preamplifier Input of 2 stage of preamplifier Not Connected
nd rd st
I/O
O I I O O O I I O O I/O O I/O O O I I or O O O I I O I O I
55 50 57-64 9, 39,54 44 22-29, 30-37 40 42 21 56 47 10,38 41 43 45 46 19 20 NA NA
Pulse Width Modulator Output0 Analog Output (unbuffered). External Data Bus Vss Power Down. Active high when powered down. General Purpose Port I/O. Pin P0.0 can act as an external interrupt input. All I/O pins can act as "wake up" inputs. External Code Read Strobe External Data Read Strobe Reset Test Mode or Pulse Width Modulator Output1 (multiplexed) Reference Voltage = Vdd/2 or Vdd/4. Depends on software Supply Voltage External Code Write Strobe External Data Write Strobe External Hi-memory enable (low active) External Low-memory enable (low active) Oscillator 1 output (high frequency) Oscillator 1 input Oscillator 2 output (32768 Hz) Oscillator 2 input
Note: Substrate should be connected to VSS
From the Interactive SpeechTM Line of Products
5
RSC-300/364
DATA SHEET
DC CHARACTERISTICS (TO = 0C to +70C, VDD = 2.85V - 5.25V )
SYMBOL VIL VIH(Vcc<3.6) VIH(Vcc>3.6) VOL VOH IIL IDD1 IDD3 Rpu PARAMETER
Input Low Voltage Input High Voltage Input High Voltage Output Low Voltage Output High Voltage (I/O Pins) Logical 0 Input Current Supply Current, Active Supply Current, Powerdown Pull-up resistance P0.0-P1.7 I/O Pins 5,80, Hi-Z 4.5,200, Hi-Z 200 k Selected with software 0.8*Vdd
MIN
-0.1 0.8*Vdd 3.0
TYP
MAX
0.75 Vdd+0.3 Vdd+0.3
UNITS
V V V V V
TEST CONDITIONS
0.3 0.9*Vdd <1 10 1
0.1*Vdd
IOL= 2 mA IOL= -2 mA
Vss10 20 10
uA mA uA
/XML,/XMH
k
Fixed
A.C. CHARACTERISTICS (EXTERNAL MEMORY ACCESSES) (TO = 0C to +70C, VDD = 5V; load capacitance for outputs = 80 pF; Osc=14.32 MHz)
SYMBOL 1/TCL1 TRLRH TRLAV TALRAX TRAVDV TRHDX TWLWH TAVWL TALWAX TWDVAV TWHQX PARAMETER
Processor Clock frequency -RDC (-RDD) Pulse Width -RDC (-RDD) Low to Address valid Address hold after -RDC (-RDD) Address valid to Valid Data In Data Hold after -RDC (-RDD) -WRC (-WRD) Pulse Width Address Valid to -WRC (-WRD) Address Hold after -WRC (-WRD) Write Data Valid to Address Valid Data Hold after -WRC (-WRD) 35 35 35 5 70 0 140 70 70 5
CPU=osc/1, 1 WS MIN MAX
14.32 140 5 0 135
CPU=osc/2, 0WS MIN MAX
7.16 140 5 0 135 0 140
UNITS
MHz ns ns ns ns ns ns ns ns ns ns
6
From the Interactive SpeechTM Line of Products
DATA SHEET
RSC-300/364
TIMING DIAGRAMS
Note that the -RDC signal does not necessarily pulse for every read from code space, but may stay low for multiple cycles.
-RDD (-RDC) TRLRH ADDRESS TRLAV TALRAX DATA TRAVDV TRHDX
-WRC (-WRD) TWLWH ADDRESS TAVWL TALWAX DATA TWDVAV TWHQX
External Read Timing
External Write Timing
ABSOLUTE MAXIMUM RATINGS
Any pin to GND Operating temperature (TO) Soldering temperature Power dissipation Operating Conditions -0.1V to +6.5V 0C to +70C 260C for 10 sec 1W 0C to +70C; VDD=2.85 - 5.25V VSS=0V
WARNING: Stressing the RSC-300/364 beyond the "Absolute Maximum Ratings" may cause permanent damage. These are stress ratings only. Operation beyond the "Operating Conditions" is not recommended and extended exposure beyond the "Operating Conditions" may affect device reliability.
ORDERING INFORMATION
Part RSC-300 Die RSC-300B Die RSC-300 QFP RSC-364 Die RSC-364 QFP Shipping P/N 65-0087 65-0098 65-0111 (ROM specific) (ROM specific) Marketing P/N C300XD1B C30BXD1B C300XT1V C364XD1B C364XT1V Description Tested, Singulated RSC-300 die in waffle pack Tested, Singulated RSC-300B die in waffle pack RSC-300 64 pin 10 x 10 x 1.0 mm TQFP Tested, Singulated RSC-364 die in waffle pack RSC-364 64 pin 10 x 10 x 1.0 mm TQFP
From the Interactive SpeechTM Line of Products
7
RSC-300/364
DATA SHEET
THE INTERACTIVE SPEECHTM PRODUCT LINE The Interactive Speech line of ICs and software was developed to "bring life to products" through advanced speech recognition and audio technology. The Interactive Speech Product Line was designed for consumer telephony products and cost-sensitive consumer electronic applications such as home electronics, personal security, and personal communication. The product line includes award-winning RSC-series general-purpose microcontrollers and tools plus a line of easy-toimplement chips that can be pin-configured or controlled by an external host microcontroller. Sensory's software technologies run on a variety of microcontrollers and DSPs.
RSC Microcontrollers and Tools
The RSC family of microcontrollers (RSC-300/364) are low-cost 8-bit microcontrollers designed for use in consumer electronics. All members of the RSC family are fully integrated and include A/D, preamplifier, D/A, ROM (RSC-364), and RAM circuitry. The RSC family can perform a full range of speech/audio functions including speech recognition, speaker verification, speech and music synthesis, and voice record/playback. The family is supported with a complete suite of tools and development kits.
Application Specific Standard Products (ASSPs)
Voice DirectTM 364 provides inexpensive speaker-dependent speech recognition and speech synthesis. This easy-to-use, pin-configurable chip requires no custom programming and can recognize up to 60 trained words in slave mode, and 15 words in stand-alone mode. Ideal for speaker-dependent command and control of household consumer products, Voice Direct 364 is part of a complete product line that includes the IC, module, and Voice Direct 364 Speech Recognition Kit. Voice DialerTM 364 delivers speech recognition technology that allows users to dial phone numbers by saying the name of the person they wish to call. Voice dialing and phone directory management through speech recognition can be easily integrated into existing products. This IC is designed for use as a slave chip controlled by an external host processor. Voice ExtremeTM simplifies the creation of fully custom speech-enabled products by offering developers the capability of programming the chip in a high-level C-like language. Program code, speech data, and even record and playback information can be stored on a single off-chip Flash memory. Based on Sensory's RSC-364 speech processor, Voice Extreme includes a highly efficient on-chip code interpreter, and is supported by a comprehensive suite of low-cost development tools..
Software and Technology
Voice ActivationTM micro footprint software provides advanced speech technology on a variety of microcontroller and DSP platforms. A flexible design with a broad range of technologies allows manufacturers to easily integrate speech functionality into consumer electronic products. Fluent SpeechTM small footprint software recognizes up to 50,000 words; offers Animated Speech with the ability to automate enunciation and articulation; performs text-to-speech synthesis in either male or female voices; provides noise and echo cancellation, performs wordspotting for natural language usage; offers telephone barge-in; and provides continuous digit recognition. IMPORTANT NOTICES
Sensory reserves the right to make changes to or to discontinue any product or service identified in this publication at any time without notice in order to improve design and supply the best possible product. Sensory does not assume responsibility for use of any circuitry other than circuitry entirely embodied in a Sensory product. Information contained herein is provided gratuitously and without liability to any user. Reasonable efforts have been made to verify the accuracy of this information but no guarantee whatsoever is given as to the accuracy or as to its applicability to particular uses. Applications described in this data sheet are for illustrative purposes only, and Sensory makes no warranties or representations that the RSC series of products will be suitable for such applications. In every instance, it must be the responsibility of the user to determine the suitability of the products for each application. Sensory products are not authorized for use as critical components in life support devices or systems. Sensory conveys no license or title, either expressed or implied, under any patent, copyright, or mask work right to the RSC series of products, and Sensory makes balance between recognition and synthesis no warranties or representations that the RSC series of products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Nothing contained herein shall be construed as a recommendation to use any product in violation of existing patents or other rights of third parties. The sale of any Sensory product is subject to all Sensory Terms and Conditions of Sales and Sales Policies.
1991 Russell Ave. Santa Clara, CA 95054
(c) 2000 SENSORY, INC. ALL RIGHTS RESERVED P/N 80-0116-7 Sensory is registered by the U.S. Patent and Trademark Office. All other trademarks or registered trademarks are the property of their respective owners.
TEL: (408) 327-9000 FAX: (408) 727-4748 From the Interactive SpeechTM Line of Products

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