Product category:
Analogue and Mixed Signal ICs
News Release from: Oki Electric | Subject: ML22Q54/Q58
Edited by the Electronicstalk Editorial
Team on 31 March 2005
Acoustic playbacks have high density
memory
Oki has added two new members to its high quality sound and multifunctional speech family.
Oki has added two new members to its high quality sound and multifunctional speech family Offering its highest density internal ROM the ML2256 integrates 6Mbit mask ROM and the ML22Q58 incorporates 8Mbit of Flash memory, allowing playback duration of up to 260s (at 4bit ADPCM/8kHz sampling rate)
This article was originally published on Electronicstalk on 10 Apr 2002 at 8.00am (UK)
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With the ML2251/52/53/54, ML22Q54 and ML2240 Oki offers mask ROM, Flash and ROMless versions.
The ML225x family provides two-channel mixing and mono output while ML2240 provides four channels and stereo output.
The ML22Q54 and Q58 incorporate 4 or 8Mbit Flash and are designed for prototyping, allowing onboard programming and storage of digital data.
As the Flash and mask ROM versions are pin compatible it is easy to switch from Flash to mask for mass production.
Each device has an independent channel volume control, offering -60 to 0dB in 2dB steps.
The channel independent loop playback function provides memory space saving.
Internal 14bit D/A convertor combined with a digital lowpass filter (FIR type interpolation filter) and Oki's high precision ADPCM2 algorithm enhance the sound quality.
Five algorithms (2/4bit OKI ADPCM2, 8bit Oki nonlinear PCM and 8/16bit PCM) combined with its wide range of sampling frequencies up to 48kHz, this allows the user to optimise data size and sound quality.
The availability of serial and parallel MCU interface makes the system implementation easy.
This multifunction speech synthesiser family provides high quality sound and is ideal for high-end applications such as alarm and warning systems, automotive and other systems equipped with sound and voice guidance.
Oki has available ML2250 and ML2240 demonstration and evaluation kits.
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