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Voice Dialer Speech Recognition Dialing IC
Speaker Dependent IC for Voice Dialing Applications
GENERAL DESCRIPTION
The Voice Dialer IC, from the Interactive Speech family of products, is an application specific standard product (ASSP) designed for cost-sensitive telephony applications. This IC features speech recognition technology that allows users to dial phone numbers by saying the name of the person they want to call. With Voice Dialer IC a complete dialing system can be built with minimal components. The Voice Dialer IC is designed for use as a slave chip controlled by an external host processor. The external host sends commands to perform dialing and directory functions, such as adding names to the directory, dialing a name, and playing back a phone number. The Voice Dialer manages a full telephone directory of names, speech recognition templates and telephone numbers. The Voice Dialer IC employs a sophisticated neural network to recognize trained names with high accuracy. Its advanced technology delivers accurate recognition in difficult noise environments, such as automobiles, and adjusts for recognition over different distances - ideal for speakerphone applications. Voice Dialer can be integrated into existing products or used to develop new innovative applications. Voice dialing is now possible for all consumer telephony products!
FEATURES
Complete Dialing Solution * 60 name telephone directory * Speaker dependent speech recognition for dialing by name * User-friendly speech prompts * Digital recording and playback of directory entries * DTMF generation Powerful Functionality * Add, modify, delete directory commands * Multiple directories * Multiple telephone numbers per name * Language localization and custom synthesis options * On chip A/D, D/A and pulse width modulator Easy to Implement * Simple 3-wire host interface * Interfaces to Flash memory * High level commands * Minimal external components required
Voice Dialer Block Diagram
Oscillator
Microphone
External Preamp
AGC0 AGC1 MHS Host Computer DATA SHS
A/D Converter and Audio Signal Processor
Neural Network Recognition Engine
Speech DTMF Generator
PWM/ DAC
Speaker Amplifier (DAC Only)
Speaker AGC
External ROM/ Flash Interface Serial Interface -MUTE -TALK -DEBUG
Voice Dialer
Flash External Memory ROM
From the Interactive Speech Line of Products
DATA SHEET
Voice Dialer
FEATURE OVERVIEW
The Voice Dialer is a single-chip CMOS device. The Voice Dialer uses sophisticated speech recognition technology to map spoken commands to phone numbers. Using easy-to-learn, intuitive techniques, end users train the Voice Dialer, which performs speaker-dependent (SD) speech recognition, speech prompting, and DTMF (Dual Tone Multi-Frequency) synthesis. The Voice Dialer is available in IC, IC Module, and Evaluation Board formats.
Depending on the memory selected Voice Dialer can store either 30 or 60 names. Using attribute bytes, applications can also create multiple directories. Users can access all data associated with a name entry either by voice recognition or sequentially. Users can also organize multiple directories or categories.
SPEECH PROMPTS
Voice Dialer provides an internal English vocabulary with more than 100 phrases of general-purpose Standard English, developed for telephony applications. The onboard standard word list can be replaced with a customized word list for English or foreign languages via an external ROM chip.
EXTERNAL HOST CONTROLLER
Sensory's Voice Dialer operates as a slave chip, receiving and processing commands from a host controller or Master CPU (Host) and returning status information and data. The Voice Dialer has private access to its own control program, to an optional language/extended speech ROM, and to a non-volatile external read/write Flash memory. Either 1 or 2 megabits of flash memory are supported - the size reflects application-specific requirements for the phone directory. Communication with the Host is through a 3-wire serial bus. The Voice Dialer includes a rich command set allowing the programmer to implement complex voice recognition functions with a minimum of Host overhead. This allows the application software to focus on providing an intuitive and efficient user interface.
INPUT AUDIO AMPLIFIER AND FILTER
Voice Dialer requires an external pre-amplifier to condition the input signal. When used with an inexpensive omni-directional electret microphone, the input audio amplifier and filter must provide approximately 58 dB of low-noise mid-band gain, 2-bit AGC controllability, and a first order bandpass response with 3dB points at roughly 700 Hz and 3300 Hz.
AUDIO OUTPUT
Voice Dialer can directly drive a 32-Ohm speaker from the PWM0 and PWM1 pins providing approximately 0.15W of audio power, or an output amplifier and speaker can be connected to the DACOUT pin.
DIALING DIRECTORY MANAGEMENT
Entry Data Template Phone Number Attribute Byte
FLASH MEMORY
The Voice Dialer uses non-volatile memory (Atmel AT29C010/ SST29EE010- 1Mbit or SST29EE020-2 Mbit) to store speech templates and phone numbers. Flash memory is included in the Voice Dialer Module.
Recording Data
The Voice Dialer maintains a dialing directory with the following information for each entry: * * * * A speaker-dependent speech template - a patterned of the trained name A voice recording of the name - the system plays the recording for confirmation Four 0-30 digit strings - the telephone numbers associated with name An attribute byte - to identify the kind or type of entry during searches
ASSP MODULE
The Voice Dialer solution is also available as a complete module. The module is a single 2" x 2" PCB that includes all external components (e.g., preamplifier, flash memory) required by Voice Dialer, except microphone and speaker. This module is ideal for prototype development or small production runs.
From the Interactive Speech Line of Products
Voice Dialer
DATA SHEET
IC PIN DESCRIPTIONS
64 1 49 48
Voice Dialer System 64-pin QFP
4
16 17
Name GND VDD AGND AVDD VDD -RESET SH XO1 XI1 AIN0 AIN1 AGC0 AGC1 PWM0 -TE1/PWM1 DACOUT -MUTE -TALK A[15:0] A16 A17 D[7:0] -RDC -RDD -WRC -WRD MHS SHS DATA DEBUG -XMH -XML QFP Pin 9, 22 41, 56 23 52 55 10, 40 21 49 19 20 51 50 33 32 53 54 48 30 31 1-8, 11-18 36 35 57-64 42 44 43 45 39 25 24 34 46 47 26-29, 37-38 Description
33 32
I/O I I O I I I O O O I or O O O O O O O I/O O O O O I O I/O I I I -
Digital Ground, CPU core (pins 1 and 33) and I/O (pins 18and 52) Digital Supply Voltage (core) Analog Ground. For noise reasons, analog and digital grounds should connect together only at the VDS Analog Voltage. For noise reasons, keep this supply independent of digital circuitry. Digital Supply Voltage (I/O line) Reset Sample and Hold. Connect a 470 pF capacitor from here to AGND. Oscillator 1 output (high frequency) Oscillator 1 input Analog In, low gain. (range AGND to AVDD/2.) Analog In, hi gain (8X input amplitude of AIN0, same range) Audio pre-amplifier Automatic Gain Control line 0 Audio pre-amplifier Automatic Gain Control line 1 Pulse Width Modulator Output0 Test Mode or Pulse Width Modulator Output1 (multiplexed) Analog Output (unbuffered). Audio mute signal. Active low during DTMF output Audio talk signal. Active low during speech synthesis External ROM/Flash Memory Address Bus External ROM/Flash Memory Address line A16 ROM A15 External Flash Memory Address line A17 External ROM/Flash Data Bus External Code Read Strobe External Data Read Strobe External Code Write Strobe External Data Write Strobe Master Handshake. Driven by host. Slave Handshake. Driven by Voice Dialer. Serial Data between Master and Slave. Bi-directional Enable Debug Diagnostic speech Default/Custom Speech Select Unused. Must be tied high Unused
From the Interactive Speech Line of Products
DATA SHEET
Voice Dialer
ABSOLUTE MAXIMUM RATINGS ELECTRICAL SPECIFICATIONS
OPERATING CONDITIONS -20C to +70C;
Vcc=3.5-5.0V; Vss =0V
ABSOLUTE MAXIMUM RATINGS
Maximum voltage
7.5V Vss-0.6V Vdd+0.6V Any pin to GND ~0.1V to +7.5V Operating temperature (TO) -20C to +70C Soldering temperature 260C for 10 sec
Minimum voltage on any pin Maximum voltage on any pin
WARNING: Stressing the Voice Dialer 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.
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. RSC Microcontrollers The RSC family of microcontrollers (RSC164, RSC264T, RSC364) 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, D/A, ROM, and RAM circuitry on chip. The RSC264T and RSC364 also include on chip preamplification. The RSC family of microcontrollers can perform a full range of speech/audio functions including speech recognition, speaker verification, speech and music synthesis, and voice record/playback. Voice DirectTM The Voice DirectTM TSSP provides cost-sensitive products with speaker-dependent speech recognition, speech synthesis and DTMF tone generation. This easy-to-use, pin-configurable chip requires no custom programming and can recognize up to 60 trained words. Voice Dialer Software The Voice Dialer software provides advanced speech technology on a variety of microcontroller and DSP platforms. A complete speech API and flexible design allows manufacturers to easily integrate into telephony products. 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.
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(c) 1996 SENSORY, INC. ALL RIGHTS RESERVED P/N 80-0085-3 Sensory is registered by the U.S. Patent and Trademark Office. All other trademarks or registered trademarks are the property of their respective owners.
From the Interactive Speech Line of Products

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