Mitsubishi's Audio Integrates Full Range of Car Audio Sound Controls
1 March 2000
Mitsubishi's Audio Signal Processor Integrates Full Range of Car Audio Sound Controls into Compact 36-Pin Package
SUNNYVALE, Calif.--March 1, 2000--Pincount by 30 Percent; Reduces Audio System Noise
Mitsubishi Electronics America's Electronic Device Group today announced it is sampling the M61508FP audio signal processor, which uses switched capacitor filter (SCF) technology. The device integrates a full range of car audio sound controls -- including sound and volume controls -- into a compact 36-pin package, reducing the number of additional board-level peripheral components by 60 percent (24 components) and the pincount of previous-generation devices by 30 percent (16 pins). It also reduces audio system noise through its innovative zero crossing detection circuit and master volume control circuit design.
"As competitive pressures force car audio entertainment systems to fit into smaller form factors and become more complex, it is necessary for audio system manufacturers to cost-effectively integrate more features into a smaller space," said George Riehm, senior product marketing manager at Mitsubishi Electronics America. "Mitsubishi has developed SCF technology to not only reduce the space required for peripheral circuitry and lower system development costs, but also to increase the functionality by effectively having an analog sound processor to enable enhanced sound field functions without a DSP."
The SCF technology integrates volume and tone control features into one integrated circuit, including:
-- Master volume control
-- Fader volume control, which provides the balance control for
front and rear speakers
-- Non-fader volume control, which controls subwoofer volume
-- Tone control, which adjusts audio sine wave characteristics, with
adjustable center frequency (f0), and the Q (quality factor) via
a two-wire serial interface
-- Input gain control, which allows amplitude control of each
standard and differential input source from up to five channels.
-- Microcontroller interface, which allows a microcontroller to
control every function of the device via a two-wire serial
interface
The device also reduces overall audio system noise through its
innovative zero crossing detection and master volume control circuit
design. The zero crossing detection circuit adjusts the audio signal
level when the audio signal reaches one-half VCC, thereby reducing the
level of switching noise. The master volume control is implemented
both before and after the tone control circuitry, reducing the noise
level when the tone control is turned on.
Specifications
The M61508FP audio signal processor has the following
specifications:
-- Input selector:
-- 5 channels
-- Differential input (+/- input)
-- Input gain control: 0 ~ +18.75 dB (in 1.25-dB steps)
-- Loudness: -2 ~ -30 dB (in 2-dB steps); negative infinity
decibels; f0: 60 Hz, 80 Hz, 100 Hz.
-- Tone control:
-- Bass: +16 ~ -12 dB (in 2-dB steps); f0: 50 Hz, 80 Hz, 120
Hz; Q: 1, 1.25. 1.5. 2.
-- Midrange: +12 ~ -12 dB (in 2-dB steps); f0: 700 Hz, 1 kHz, 2
kHz; Q: 1.5, 2.
-- Treble: +12 ~ -12 dB (in 2-dB steps); f0: 8 kHz, 12 kHz.
--- Master volume
-- Before tone control: 0 ~ -31 dB (in 1-dB steps)
-- After tone control: 0 ~ -62 dB (in 2-dB steps); negative
infinity decibels
-- Non-fader volume: +12 ~ -12 dB (in 2-dB steps); negative infinity
decibels
-- Fader volume: 0 ~ -60 dB; negative infinity decibels
-- Power supply voltage level:
-- Analog: 7 ~ 9 volts (8 volts standard)
-- Digital: 4.5 ~ 5.5 volts (5 volts standard)
Packaging, Availability, and PricingMitsubishi's M61508FP audio signal processor is available in a 36-pin shrink small outline package (SSOP) package with a 0.8-mm pitch. Samples will be available in April 2000, with volume production scheduled for October 2000. Pricing is $4.75 each in sample quantities.
About Mitsubishi Electric and Mitsubishi Electronics America Inc.
Ranked among the top-10 worldwide semiconductor suppliers, Mitsubishi Electric Corporation is a leading manufacturer of low-end to high-end sound processors for numerous applications, such as home and car audio; Compact Disc player; videocassette recorder; middle-class and high-end monitor; and middle-class, high-end and LCD TV applications. The company also makes other application-specific standard products (ASSPs) for motor driver, TV, VCR, fax, disk drive, telephone, communications and audio/video system applications, as well as standard linear and digital/analog interface ICs. Mitsubishi's ASSPs are manufactured with extensive feature sets that meet specific application requirements and use a standard-cell design approach to reduce chip size, costs and product development time. The company implements its ASSPs as standard ICs for multiple customers and maps them to singular or multiple applications.
Mitsubishi Electric offers an extensive range of semiconductor-based products and markets them to the North American marketplace through the Electronic Device Group of Mitsubishi Electronics America, Inc.
Additional information on the Mitsubishi Electric Semiconductor Group is available at http://www.mitsubishichips.com/.
Trademark Information
Mitsubishi and the Mitsubishi logo are registered trademarks of Mitsubishi Electric Corporation in the U.S.A., Japan and other countries.
Keywords
Mitsubishi, SCF, switched capacitor filter, audio signal processor, sound processor.