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PRODUCT INFORMATION
Vol. 78
Virtual Dolby Surround IC Developed VASILTM algorithm processing implemented on a single chip
LV1018
Overview
The Dolby ProLogic Surround System developed by Dolby Laboratories has been widely adopted in movie theaters as a multi-channel audio system. Furthermore, due to the development of Dolby ProLogic decoder ICs, use of this system is growing in the home audio market as well, mainly in the US. Recently, the Dolby Digital, also developed by Dolby Laboratories, has been adopted as the standard format for multi-channel audio in digital media such as DVD, ATV, and cable TV, and is expected to exhibit strong growth in the home entertainment market. However, multi-channel audio systems have the problem that they require multiple speakers, and this requirement is a problem preventing their more rapid growth in the consumer market. Virtual surround technology has been proposed to overcome this problem. This technology can create an audio effect close to that of a true multi-channel audio system using only the two speakers from an existing audio system. In particular, it is able to do this by only providing an optimal listening point over a limited area, a limitation that is reasonable for spaces used by small numbers of people such as homes. Thus virtual surround technology can contribute to the spread of the easy enjoyment of the surround effect, which provides a feeling of presence and reality, in the homes of ordinary consumers. In September of 1998, Sanyo announced the development of the VASILTM (Virtual Acoustic Surround Image Localizer) virtual surround algorithm that supports multi-channel audio systems and is based on Sanyo-developed audio image positioning algorithms. This algorithm responds to several problems with earlier virtual surround systems, and features reproduction with even more natural sound colorings and a wide "sweet spot." It achieves these with a minimal amount of signal processing and has been well-received by audio equipment manufacturers. Sanyo has now developed a single-chip passive decoder IC, the LV1018, that incorporates the VASILTM algorithm implemented in a analog/digital hybrid technology based on Sanyo's unique BiCMOS process technology. Sanyo has now acquired approval for virtual Dolby surround from Dolby Laboratories and will begin sample shipment of the LV1018 in May 1999. The LV1018 can be combined with Sanyo's existing Dolby ProLogic matrix decoder, the LA2787, to
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
form a system that provides both a Dolby ProLogic surround system and a virtual signal-processing system in just two chips. Since the LV1018 also implements pseudo-stereo from the monaural surround channel using pseudopitch shifting and matrix processing, it can, when combined with the LA2787, provide simulated 5-channel playback from a 4-channel Dolby Surround source, and thus achieve a sound with an even more natural sense of breadth. Furthermore, the LV1018 provides an internal function switch that can easily switch between external input signals, such as Dolby digital signals (5.1 channel signals) from a DVD and provide virtual processing for these external signals as well. In addition, it supports the set up of a wide range of digital surround modes that take advantage of its pseudo-tap function, and thus can easily implement many surround modes. At first, the LV1018 will be marketed for the audio equipment such as receivers and "minicomponents". For those applications, Sanyo now holds a commanding market share in the Dolby ProLogic surround market. In the future, Sanyo plans to develop multimedia application products that can take advantage of the VASILTM technology.
Features
* Virtual Dolby surround implemented using analog/digital hybrid technology * A Dolby ProLogic surround system can be easily formed by combining the LV1018 with the LA2787. * A pseudo-five-channel system can be formed by combining the LV1018 with the LA2787. * Built-in 5-channel external input function for use in combination with the LA2787. * Clock, data, and enable signals can be shared between the LV1018 and LA2787 for serial data transfers from the system microcontroller.
Specifications
1. Functions * Dolby surround passive decoder * On-chip memory (8K SRAM) * Variable delay time Dolby surround mode: 15, 20, 25, and 30 ms Pseudo-surround mode: 7.5, 15, 20, 25, 30, 40, and 50 ms * Modified Dolby B noise reduction * Surround trim function (0 to -31 dB in 1-dB steps) for the LS and RS channels
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
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PRODUCT INFORMATION
* On-chip input and output filters (Output - Dolby surround mode: 7 kHz, pseudo-surround mode: 5 kHz) * On-chip Vdd circuit * Pseudo-surround function -- Fixed matrix: L + R, L - R -- Front addition: 0, -2, -4, and -6 dB, inverting and noninverting addition -- Reverb function * Monaural/stereo switching function for the rear channels -- Rear addition: 0, -2, -4, and -6 dB, inverting and noninverting addition * Pseudo-tap function * Left, right, LS, and RS input switch * Muting function * Virtual surround function 2. Recommended supply voltage (VCC): 9.0 V Operating supply voltage range (VCCOP): 8.0 to 10.0 V 3. Package: DIP-42S VASILTM is a trademark for the virtual 3D algorithms developed by Sanyo. Sanyo has applied for registration of this trademark.
SANYO Electric Co., Ltd. Semiconductor Company Overseas Marketing Division
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PRODUCT INFORMATION
Sample Availability
Sample of the LV1018 will be available in May 1999; production quantities will be anticipated in October 1999.
APRIL 27, 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 42799/78
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