Features: • Integrated text-to-speech processor:
High voice quality, unlimited vocabulary
Converts any ASCII text into speech automatically
Capable of very high reading rates
Add/modify messages by simply editing a text file
On-the-fly control of speed, pitch, volume, etc.
• Playback of sound files:
Real-time PCM and ADPCM
Prerecorded on chip, up to 15 minutes
• Tone generation:
Three voice musical
Dual sinusoidal
DTMF (Touch-Tone) dialer
• On-chip A/D converter:
Four channels, 8-bit resolution
One-shot, continuous, single sweep, and continuous sweep modes of operation
Software and hardware triggering
Support for external op amp
• Analog and digital audio outputs
• Stop, pause, and resume controls
• Serial and bus interfaces
• User programmable greeting and default settings
• Flexible user exception dictionary:
Change the pronunciation of any input string based on spelling and context
Convert encrypted data into meaningful messages
Trigger tone generation, recorded message playback,voice parameter changes
• In-circuit, field programmable
• 2 KB input buffer for virtually no-overhead operation
• Available in 3.3 V and 5 V versions
• Low power (typ @ 3.3 V):
8.8 mA active
700 µA idle
2 µA standbyApplication• Robotics
• Talking OCR systems
• ATM machines
• Talking pagers and PDAs
• GPS navigation systems
• Vending and ticketing machines
• Remote diagnostic reporting
• Dial-up information systems
• Handheld barcode readers
• Electronic test and measurement
• Security systems
• Aids for the orally or visually disabled
• Meeting federal ADA requirementsPinout
SpecificationsSupply voltage, VCC and AVCC . . . . . . . . . . . . . . . . . . 0.3 V to +6.5 V
DC input voltage, VI . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VCC +0.3 V
Operating temperature, TA . . . . . . . . . . . . . . . . . . . . . . . 0 to +70
Storage temperature, TS . . . . . . . . . . . . . . . . . . . . . 55 to +125 DescriptionThe RC8650 is a highly versatile voice and sound synthesizer, integrating a text-to-speech (TTS) processor, real time and prerecorded audio playback, musical and sinusoidal tone generators, telephone dialer and A/D converter, into an easy to use chipset. Using a standard serial or eight bit bus interface, virtually any ASCII text can be streamed to the RC8650 for automatic conversion into speech by the TTS processor. The audio playback modes augment the TTS processor for applications requiring very high voice quality and a relatively small, fixed vocabulary, or applications requiring special sounds or sound effects. The audio output is delivered in both analog and digital PCM audio formats, which can be used to drive a speaker or digital audio stream.
The RC8650's integrated TTS processor incorporates RC Systems' DoubleTalk™ TTS technology, which is based on a patented voice concatenation technique using real human voice samples. The DoubleTalk TTS processor also gives the user unprecedented real-time control of the speech signal, including pitch, volume, tone, speed, expression, articulation, and so on.
Up to 3.5 MB of nonvolatile memory is included in the RC8650 for the storage and on-demand playback of up to 15 minutes of prerecorded messages and sound effects. A programmable "greeting" message can be stored that is automatically played whenever the RC8650 is powered up, allowing a custom message to be played or the RC8650's default settings to be reconfigured. A user-programmable dictionary allows the pronunciation of virtually any character string to be rede- fined, or even trigger the playback of tones, prerecorded messages and sounds based on specific input patterns. All of these features can be programmed and updated via a standard serial port, even in the field after the RC8650 has been integrated into the end-product.
The RC8650 is comprised of two surface-mounted devices. Both operate from a +3.3 V or +5 V supply and consume very little power. Most applications require only the addition of a lowpass filter/audio power amplifier to implement a fully functional system.
RC8650 Data Sheet
