ROHM, a world-renowned semiconductor manufacturer, has developed a Hi Res solution for home theaters, etc.*1) A sound processor "BD34704KS2 / BD34705KS2" for Hi-End AV amplifiers, which is used for audio volume adjustment and signal line switching.
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"BD34704KS2 / BD34705KS2" is a new series of ROHM sound processors with a high level of praise for more than 120 million cumulative shipments (last 5 years). It is more focused on sound quality and is a product developed with the introduction of new sound quality design technology.
The most important features of the inherited audio products are low distortion*2) (the industry's top 0.0004%) and low noise (the S/N ratio is increased from -128dB to the industry's highest *131dB). In order to achieve the desired sound quality, In the audition room set up by our company, experiments and auditions were repeated, and the techniques affecting IC sound quality were summarized into 28 unique parameters, and the design techniques were established. Pay attention to the space performance required by AV amplifiers for sound quality design and achieve high sound quality. Therefore, it has been well received by the audio manufacturer that "even a small volume can present a lot of information about the sound source and the space is very good."
This product has been shipped in August 2016 (sample price is 2,000 yen per tax, excluding tax). It is planned to start mass production in December 2016 with a monthly production capacity of 300,000. The production base of the previous process is ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), and the production base of the later process is ROHM Electronics Philippines Inc. (Philippines).
In the future, ROHM will expand the sound quality design technology to the widely-developed car audio field to meet the growing demand for high sound quality.
<background>
In recent years, with the further popularization of high-resolution solution sound sources, high-end AV power amplifiers are required to more accurately represent the amount of information of sound sources.
ROHM is keen to capture market demand and has been leading the industry in the development of sound processors. In response to the deterioration of the sound source information at a small volume that was difficult to overcome in the past, the new sound quality design technology has successfully introduced the amount of sound source information to meet the market demand for high sound quality.
<Features>
1. Optimize 28 unique parameters to achieve high sound quality
In order to achieve the desired sound quality, experiments and auditions were repeated in the audition room inside the ROHM, and the technology that affects the IC sound quality was summarized into 28 unique parameters, and the design technique was established.
For the past products, the parameter adjustment was performed centering on the spatial performance during multi-channel playback, and the sound quality required for the AV power amplifier was successfully realized. In addition, many audio manufacturers were invited to audition, and they were praised for “a lot of sound source information and a good spatial expression even at a small volumeâ€.
28 unique parameters that affect IC sound quality
This product is optimized for parameters of up to 28 projects centering on the circuit structure and electrical characteristics that affect IC sound quality.
E.g,
・Reducing the low frequency noise generated by the volume circuit to 1/10
・Improve transient characteristics by using a layout method that suppresses interference between signals
These improve the sound localization (the position of the sound source, the sense of distance) performance and resolution (the clarity of the sound), etc., and the spatial reproducibility is significantly improved.
2. The important features of audio products reach the highest performance in the industry
Using years of accumulated technical experience, we have in-depth research into simulation techniques that are difficult to reproduce in the field of simulation, achieving low distortion (the industry's top 0.0004%) and low noise (the industry's highest S/N ratio -131dB).
3. A natural and smooth volume adjustment is possible when there is sound.
ROHM's exclusive micro-stepping volume control reduces unpleasant popping sound (POP noise)*3). It can support music playback and silent playback, so it achieves a natural and smooth volume adjustment without damaging the taste of high-end audio.
<Product lineup>
<term explanation>
*1) High resolution solution source (high resolution source, Hi Res)
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) Distortion rate (total harmonic distortion)
A value indicating the degree of distortion of the signal (sound), and a smaller value indicates a smaller distortion.
*3) Blasting sound (POP noise)
Generally, it refers to all noises such as “噗噗†that do not occur in the occasion, and this refers to the noise generated when the volume is adjusted.
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