MSM9831 Brief Application Note Robert Brenner, Marketing Com

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MSM9831 Brief Application Note Robert Brenner, Marketing Com

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People People Technology
MSM9831
Brief Application Note
Robert Brenner, Marketing Communications
March 1998 October 1997
With MSM9831 manufactured Electric Industry Co., Ltd., Japan, comes low-cost speech synthesiser with integrated mask designed applications which demand high voice quality, suffice with relatively short playback times. Integration this small device into existing digital systems designs child's play.
Half size currently available LSIs that kind, MSM9831 emits wide variety high quality natural sounds, opens door LSIs included wide range applications. MSM9831 used various applications including voice guidance systems, vehicle navigation systems, mechanical sound effects digital appliances improve functionality many existing electronic equipment. world becomes increasingly digital, many sounds emitted electronic appliances, sounds have grown accustomed will begin disappear. example, think strange would hear steady clicking your car's turn signal when activated. MSM9831 ability sounds such these back into electronic equipment, allows manufacturers make transition digital technology seamlessly possible. fixed 8-bit vertical resolution playback time voice quality requirements selected best suit given application. example 8kHz sampling (64kbps bit-rate), playback time seconds master clock 4.096MHz. Table
Sampling Filter Cut-off Frequency Frequency
[kHz] [kHz] (-3dB)
input refers channel number played while pulses reset internal address counter. Playback then commences upon rising edge _ST. Playback stopped returning without pulse into _PI. _PDWN sets device standby mode. AOUT open drain N-MOS output which provides filtered audio signal form changing output currents. Signals cannot picked before filter. Cut-off frequency output frequency characteristics vary proportionally with sampling frequency applied (Figure
Playback Time
[sec]
10.6 12.8 16.0
11.8
FIGURE Characteristic low-pass filter 8KHz sampling
TABLE Values specified 4.096MHz clock frequency based 378kbit free area. Playback times obtained memory (sampling rate number).
Algorithm
Unlike other speech products, MSM9831 utilises 8bit Pulse Code Modulation (PCM) storage speech data. Interestingly, data nonlinear nature provides fidelity equivalent 10-bit linear range waveforms. Consequently, signal-to-noise ratio significantly improved.
more details. total, playback channels addressed. Also incorporated on-chip 10-bit current-type high quality low-pass filter. Providing wide power supply range from +2.0 +5.5V, MSM9831 suitable both platforms whilst drawing merely maximum 1.0mA within ambient temperature from +85°
Block Functions
Figure shows block schematic diagram unveiling simple effective design. serial interface provided control functions conjunction with which needs provide only three output ports. address input through which channel number replayed defined means pulses while kept number pulses
standby mode, AOUT assumes half level that current continues flowing, internal canceller circuit prevents occurance noise. oscillator circuit _XT) used ways. ceramic oscillator rating 4.5MHz (typically 4.096MHz) across provides conventional means operation. Additionally, external clock input while left open. sampling frequencies will vary proportionally with clock therefore take influence playback time quality.
Internal Mask
built-in 384KBit reserves Kbit area so-called Phrase Control Table, PCT, which allows user compile sentences consisting preinstalled words with same simple control individual word addressing. sentences were stored phrases they would occupy more memory since
Structure
With selectable sampling frequencies ranging from 16kHz intervals
Page
PDWN Serial Control Interface 16-Bit Address Controller AOUT
100nF
P1.2 P1.1 P1.3
AOUT
PDWN
Timing Controller
10-Bit
2Kbit Phrase Control Table 2Kbit Address 2Kbit Test
9831
Oscillation Circuit
Data Area 378KBit
Synthesiser
PDWN
SOP8-P-250-1.27K (top view)
FIGURE Block diagram assignment
AOUT
PDWN
AOUT
certain words have stored multiple times. only does reduce requirement memory, also releaves considerably. Address Words [Hex] addressable from will "sunny" "cloudy" corresponding "today" "tomorrow" channels. "partly" eight word
FIGURE Principle playback stop timing.
better memory economy less intervention compensate well.
Small Package
MSM9831 comes small package measuring only 6.8mm area with maximum mounting profile 2.05mm. lead pitches 1.27mm (50mils) reflow soldering applicable. This small package given external components required make easy cost effective realise speech add-ons miniature digital electronic products.
Typical Application
simple application MSM9831 illustrated Figures showing means oscillation audio amplification. 320ms silence principle, playback started Address addresses assigned Sentence compiled [Hex] with timing will sunny today" displayed Figure will cloudy tomorrow" further will cloudy today" will sunny, partly cloudy tomorrow" possible re-input address whilst playback ongoing TABLE Example data Phrase Control Table pattern. course stop when addresses assigned lowered 0.35 2000µs these addresses, including raised again. 350µ (@8kHz silence insertion from 996ms sampling frequency) after intervals 32ms. Table raising edge, playback will stop. shows typical example. 100nF small table contains word phrases their corresponding addresses stored ROM. P1.2 These addresses referred P1.1 AOUT which contains P1.3 PDWN address registers individual 9831 4.096MHz addresses words which part desired sentence. Upon selection either addresses, complete sentence FIGURE Typical application with ceramic oscillator. replayed without need picking every word Note that this stop timing varies from ROM. illustrated block proportionally with sampling diagram, reduces frequency. area 2KBit, however,
Page
Item Size Playback Time Phrases Operating Modes Control Phrase Control Oscillation Active current Packaging
MSM9831 384KBit 11.8 serial 4.096MHz 8-SOP
MSM9802 512KBit 56/63 SA/MCU parallel
256kHz/ 4.096MHz
MSM9803 1MBit 32.4 56/63 SA/MCU parallel
256kHz/ 4.096MHz
MSM9805 2MBit 65.1 56/63 SA/MCU parallel
256kHz/ 4.096MHz
MSM98P05 2MBit 65.1 56/63 SA/MCU parallel
256kHz/ 4.096MHz
MSM9836 3MBit parallel
4.096MHz
Code Development
Speech sound codes generated with development system from designated AR204. consists 16-Bit card, Windows software programming unit (Photo
16mA
18-DIP, 24-SOP, 30-SSOP
16mA
18-DIP, 24-SOP, 30-SSOP
16mA
18-DIP, 24-SOP, 30-SSOP
16mA 20-DIP, 24-SOP
16mA 24-SOP
TABLE MSM9800 series non-linear speech playback LSIs with internal mask ROM. Playback times given 4kHz sampling frequency.-
Product Line-Up
MSM9831 smallest series non-linear speech synthesisers from OKI. MSM9836, MSM9805, MSM9803 MSM9802 provide 0.5MBit internal ROM, respectively allow playback channels. principle, MSM9831 downsized version MSM9802 with less ROM, less playback channels, simplified control interface, smaller package lower cost.
Application Products
Typical applications MSM9831 primarily field consumer goods, exclusively. example:
PHOTO AR204 development system's working screen.
Automotive Telephones, Handies Facsimilie Peripheral Equipment Security Systems Digital Still Cameras Digital Video Cameras Household Appliances Clocks Toys, etc.
Aided this system, user record voice edit best suit needs. address address allocations assigned easily AR204 software. also performs selection oscillator mode, playback individual phrases playback simulation. developed data converted file programmed into EPROM. That EPROM will then contain data with which will produce mask MSM9831 other devices series.
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Oscillator
particular, type crystal oscillators exhibit narrow tolerances stable startup continuous oscillation. Once oscillation fails, entire circuit will size operation like vehicle without fuel. Oscillation margin capability circuit activate keep oscillation going reliably. therefore important determine which crystal impedance value tolerated hosting circuit designated operating environment. This facilitated following manner:
minimum value check whether normal oscillation sets maximum value stop oscillation. oscillation
Measure current value record instance RVX. Calculate Pictured Figure typical examples measuring circuits showing direct pick inductive pick-up conjunction with frequency counter. accurate measure oscillation, frequency counter useful, since spectrum analysers designed distinguish main oscillation spurious mode. start-up detector should used connected where will least affect circuit characteristics.
FIGURE Recommended measuring circuit.
First all: best results, crystal with known precision potentiometer with maximum resistances 10k, while commonly used value.
still does stop with larger maximum resistance value. From this no-oscillation state reduce gradually until oscillation starts. maximum safety, repeat 2-3.
Page
Important Notice
does assume responsibility consequences improper handling operation shall neither liable application. customer acts responsibility shall himself make sure infringe third party rights using product. Certain products described herein fall within category strategic goods, etc. under Foreign Trade Control Law. Accordingly, before exporting such products, required file application export licence with your Government authorities. product availability details, please kind contact your nearest representative. information this brochure merely contains general product description. require about product interest, please kind latest data sheet. Specifications subject change without notice. This issue substitutes supersedes semiconductor shortform catalogues previously supplied OKI. brand, company product names trademarks registered trademarks their respective owners.
People People Technology
Electric Industry Co., Ltd., Device Business Group, 10-3, Shibaura, 4-chome, Minato-ku, Tokyo 108, Japan, Tel.: +81-(0)3-5445-6327, Fax.: +81-(0)3-5445-6328, http://www.oki.co.jp/ Semiconductor Group, North Mary Avenue, Sunnyvale, 94086, U.S.A., Tel.: +1-408-720-1900, Fax.: +1-408-720-1918, http://www.okisemi.com/ Electric Europe GmbH, Head Office Europe, Hellersbergstrasse D-41460 Neuss, Germany, Tel: +49-2131-15960, Fax: +49-2131-103539, http://www.oki-europe.de/ Electronics (Hong Kong) Ltd., Suite 1901-1&19, Tower China Hong Kong City, Canton Road, Tsimshatsui, Kowloon, Hong Kong, Tel.: +852-2-736-2336, Fax.: +852-2-736-2395 Semiconductor (Asia) Pte. Ltd., Shenton 09-01, Singapore 0207, Tel.: +65-221-3722, Fax.: +65-323-5376 Semiconductor (Asia) Pte. Ltd., Taipei Branch, No.260, North Road, Taipei, Taiwan, R.O.C., Sumitomo-Flysun Building, Tel.: +886-2-2719-2561, Fax.: +886-2-2715-2892 http://www.oki.net.tw/
Copyright 1998 OKI. Ref.: MSM9831APP
further information, please contact:

MSM9831 Brief Application Note Robert Brenner, Marketing Com

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