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PRODUCT INFORMATION
Vol.91
Acoustic Surround IC Developed AViSSTM algorithm incorporated
LA2615
Overview
As the number of audio sources increases in home AV equipment such as miniature component systems, radio/cassette players, and TV sets, there are increasing demands for both virtual systems that can provide audio effects similar to those directly achievable with multiple speaker systems and surround functions that can provide increased feelings of depth and space in traditional two-speaker stereo systems. Since the physical separation between the left and right speakers in audio products that include the speakers as integral components is quite small, earlier surround systems were only able to provide a minimal surround effect and had the problem that localization within the sound field became unclear as the volume was increased resulting in the sound seeming diffuse. Sanyo has now developed the LA2615 acoustic surround IC that overcomes these problems. This device adopts the AViSSTM (acoustic virtual sound system) algorithm for two-channel systems. AViSSTM was developed as a new surround algorithm for two-channel systems and applies the logic Sanyo developed for the VASILTM algorithm, which is based on audio image position processing logic for multichannel audio systems. The AViSSTM algorithm features natural tonal coloration and a wide "sweet spot," and requires only a limited amount of signal-processing capability. The LA2615 provides stable positioning of vocalists in the audio field regardless of the volume level by adopting the AViSSTM algorithm. It can provide an expansive and natural sound field even in audio products that include the speakers as integral components. It also allows the level of the surround effect to be switched, either for standardization of end product specifications or to provide listener control of the effect. The LA2615 also features the wide operating supply voltage range of 4.5 to 12.0 V, and thus can be used in all products that include stereo speakers, including miniature component systems, radio/cassette players, TV sets, electronic games, and personal computers. Sanyo will be deploying the newly-developed AViSSTM algorithm in a wide variety of audio devices,
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
TOKYO OFFICE: Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 1
PRODUCT INFORMATION
DSPs, and other products in the near future.
Features
* Incorporates the Sanyo-developed AViSSTM audio image position processing algorithm. -- Provides an expansive sound field without degrading the natural tonal colorings of the original audio signal. -- Precise apparent positioning of vocalists with no feeling of a missing center. * A wide operating supply voltage range (4.5 to 12.0 V) allows the LA2615 to be used in a wide range of products. * Surround effect switching function * Low-noise low-distortion bypass mode
Specifications
Functions * Surround signal processing * Surround effect switching * Surround/bypass switching * LED driver circuit * Recommended supply voltage (VCC): 9.0 V -- Operating supply voltage range: 4.5 to 12.0 V * Package: DIP-16 *: An MFP package version is planned.
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
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PRODUCT INFORMATION
Sample Availability
The LA2615 will be available in sample quantities in October 1999 and in production quantities in December 1999.
SEPTEMBER 29, 1999
s Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. s SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. s Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. s SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. s In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. s No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. s Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
PS.O1899/91
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