ROHM, a world-renowned semiconductor manufacturer, develops a mechanism that can play all common sources and control and manage peripheral components and input and output interfaces from traditional tape recorders and CDs to the latest Bluetooth speakers and USB-DACs. (A brain that can be called an audio application) is integrated into a chip that supports the high-resolution*1 Audio SoC *2 "BM94803AEKU".
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Audio SoC "BM94803AEKU"
"BM94803AEKU" is a circuit technology and software technology that combines the ASIC (Special Purpose IC) accumulated by ROHM Group for many years, microcontrollers and various media decoders. It is equipped with SDRAM and integrated on the optimized processor chip. Packaged product. The media decoder not only supports a wide range of audio sources, but also uses ROHM's accumulated technical experience for more than 20 years to achieve playback stability (smooth playback of scratched CDs, non-standard USB playback), and miniaturization by mounting SDRAM.
In addition, with the launch of this SoC, the industry's first *3 high resolution audio reference design was also introduced. The reference design is centered on the Audio SoC and consists of ROHM amplifiers, CD drivers, etc., to maximize the performance of audio equipment and peripheral applications. In addition, special software is provided to help customers quickly develop audio devices that can stably play a large number of audio sources, ensuring the time spent on sound production.
Audio SoC Application Block Diagram
Audio SoC "BM94803AEKU" has been put into mass production for 30,000 yen per month in January 2017 (sample price is 4,000 yen / piece: excluding tax), and a reference design has been launched (reference price 70,000 yen) / Taiwan: excluding tax).
In the future, ROHM will continue to expand its lineup of products supporting high resolution to meet the demands of modern high sound quality.
< Development Background>
In recent years, not only high-resolution sound sources, but also various audio devices have become increasingly demanding for faithfully reproducing the amount of information of all sound sources (media, music files).
In order to support all audio sources, not only multiple media decoders such as CDs, USBs, and Bluetooth, including peripheral components, but also software that runs these devices are becoming more and more complicated, so there is a problem that development takes a long time.
ROHM is geared to the audio field. Following the general-purpose ICs such as operational amplifiers, audio-related ICs such as sound processors, speaker amplifiers, and media decoders have been developed. This time, the Audio SoC equivalent to the brain was developed and a reference design was provided, which greatly improved the overall sound quality of the sound system and drastically shortened the development cycle.
<New Product Features>
1. Support all common audio sources that users need
Supports traditional media (CD, USB, SD) to new media (smartphone, Bluetooth), PC (USB-DAC connection), and supports many music file formats including FLAC and DSD.
Support media
2. Smooth playback of media cherished by users
The new product incorporates ROHM's development experience in ASIC and media decoders for more than 20 years. For example, scratched CDs can also be played without any sound. In addition, non-standard USB memories that exist in many emerging countries can be read. ROHM leverages the know-how accumulated over the years to achieve superior playback stability and meet user expectations for audio equipment.
3. Software with strong support for all audio device development
The Audio SoC, which provides optimized design for audio equipment, and dedicated software that maximizes its performance (provided as a reference design) can significantly shorten the development cycle required by previous audio equipment manufacturers, helping to rapidly develop audio equipment and ensure Sound production time.
4. Equipped with CD-DSP and SDRAM for miniaturization
The Audio SoC is equipped with a CD-DSP (CD media decoder) and 16M bit DRAM (made by LamboS Semiconductor), which were separately installed in the past, for integrated packaging. As a result, the mounting area is smaller and there is no need to worry about radiated noise between components.
<About Audio Reference Design>
A reference design that maximizes the performance of audio equipment produced by ROHM, centered on the new high-definition Audio SoC.
Not only the audio equipment is installed, but also the peripheral applications (tuner module, Bluetooth module, and CD drive) are installed, and the real machine confirmation of the playback work can be performed immediately. The reference design helps to quickly develop audio devices that support high resolution.
Reference design appearance
<Support application example>
Hi-Fi audio device
High resolution system combo
Recorder
Bluetooth Speaker
USB-DAC
<term explanation>
*1) High resolution sound source
Generally, the music sampling frequency of music playing with CD is 44.1 kHz, the number of quantization bits is 16 bits, and the sampling frequency of high-resolution sound source is above 96 kHz, and the number of quantization bits is more than 24 bits. That is, the high-resolution sound source has much more information than the ordinary music CD, so that high sound quality can be achieved.
*2) SoC (System on Chip)
Generally refers to an IC that integrates the functions required for system operation. This article describes a series of functions for extracting and outputting audio signals from a sound source.
*3) Added to calendar ROHM survey data as of May 10, 2017
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