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Signal processors enhance automobile audio quality

Posted: 07 Mar 2003 ?? ?Print Version ?Bookmark and Share

Keywords:Mitsubishi electric? m61528fp? fixed equalizer ic? m61523fp? volume control ic?

Mitsubishi Electric has introduced a pair of audio signal processors that use switched capacitor filter (SCF) technology to improve the sound quality of automobile audio systems.

The M61528FP fixed equalizer IC matches the audio system's sound to the passenger compartment's acoustical characteristics, while M61523FP electronic volume and tone control IC provides designers the ability to manipulate bass and treble tones in a six-speaker automobile audio system.

"For a variety of reasons, every different car interior poses a unique acoustic challenge for the car audio system designer," said George Riehm, senior marketing manager for consumer products at Mitsubishi Electric & Electronics USA, Inc. "To simplify the challenge, saving time and money, our Fixed Equalizer IC enables manufacturers to adjust the equalizer one time to the optimal acoustical setting, then go directly to production.

He added, "Because SCF technology allows the user to vary the 'Q' and the center frequency of the audio signal in our electronic volume and tone control IC, different environmental effects can be created without using a more expensive digital signal processor."

The M61528FP is a three-band device that features a wide dynamic range throughout bass, midrange, and treble frequency ranges. It allows developers to eliminate the standing waves, boost underemphasized, and subdue overemphasized frequencies, and move the sound envelope to evenly distribute the entire frequency range throughout the compartment.

Other features includes independent volume controls in each of four channels (left front, left rear, right front, and right rear), a fader volume control with a built-in noise suppression circuit, and a microcontroller interface. SCF technology enables the device to eliminate the need for external RC network components.

Similar to the M61528FP, the M61523FP uses SCF technology to save system cost by eliminating RC network components in the tone control circuit. It features a built-in, soft-switching noise-suppression circuit to reduce the noise in the master and fader volume controls. A dual input selector function enables designers to use three single inputs and one differential input for design flexibility.

The device also contains a microcontroller interface that connects the system microcontroller to the volume controller's main and sub input selector, independent gain control, soft mute, base/treble tone controls, and loudness, volume, and fader controls.

Both ICs are available in a 24-pin SSOP package that occupies a 7.8-by-10.1mm-footprint.





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