Sound Processors Integrating the Industry's First* RF Noise Removal Function

Willich-Munchheide, (PresseBox) - ROHM has recently announced the development of sound processors for volume and tone adjustment in audio devices, including car audio systems (BD37033FV, BD37034FV, BD37068FV) and AV receivers (BD34701KS2). These new products are the latest additions to ROHM's BD37xxx and BD34xxx series of sound processors. In addition to the standard features, a special RF noise removal function is included (an industry first), developed using proprietary analog technologies cultivated over many years, designed to minimize noise introduced in electrical equipment when receiving phone calls - by more than 10 times.

In general there are 2 methods for performing volume and tone adjustment in sound processors during audio playback - digital and analog. However, with digital systems there is some concern over essential sound quality degradation caused by bit drops during volume attenuation, making analog the preferred method. For these markets, ROHM utilizes its extensive analog expertise to lead the industry in high fidelity sound processor development.

In recent years, with the increased proliferation of high resolution sound sources such internet delivery and SACDs (Super Audio CDs) that exceed the standard of CDs, along with noise reduction in HEVs and EVs, comes a greater demand for higher sound quality in audio devices and systems. In addition, widespread usage of mobile phones makes it important to minimize RF noise when receiving incoming calls.

These products inherit the essential characteristics of existing systems, such as low noise and low distortion for high sound quality, as well as advanced switching in order to eliminate popping noise during volume and tone adjustment. New features include the industry's first RF noise removal function for audio equipment that cuts noise generated by incoming phone calls, along with an audio leakage prevention function that activates when power supplies connected to an external amp are turned OFF.

ROHM takes advantage of expertise obtained through repeated, long-term evaluation using in-house listening rooms and EMC testing in ROHM's anechoic chamber, along with proprietary analog technology in regions that cannot be duplicated through simulation, to meet market needs for superior audio fidelity.

Key Features

1.RF noise induced by incoming mobile phone calls cut by more than 10x

The industry's first RF noise removal function cuts unpleasant noise introduced in audio equipment when receiving wireless phone calls - without the need for additional components or external countermeasures.

2.Sound leakage prevented when using external power amp (BD37034FV)

The internal sound leakage prevention circuit reduces sound leakage generated when power supplies attached to an external power amp are turned OFF to only 1/30th the original level.

3.Low-frequency noise reduction improves sound quality

Extensive analog experience and original technologies are used to eliminate noise in the low-frequency region that cannot be reproduced through simulation.

4.Popping noise eliminated during volume/tone adjustment

ROHM's advanced switching operation minimizes popping noises generated when adjusting the volume and/or tone for smooth, natural audio transition.


The product is available.

*December 24, 2013 ROHM Survey

ROHM Semiconductor GmbH

ROHM Semiconductor is a global company of 292,4 billion yen (2,98 Billion $) revenue with 20.203 employees in the last fiscal year ending March 2013. ROHM Semiconductor develops and manufactures a very large product range from the Ultra Low Power Microcontroller, Power Management, Standard ICs , SiC Diodes, Mosfets and Modules , Power Transistors and Diodes, LEDs to passives components such as Resistors, Tantalum Capacitors and LED display units, thermal Printheads in state-of-the-art manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, China and Europe.

Lapis Semiconductor (former OKI Semiconductor), SiCrystal AG and Kionix are companies of ROHM Group.

ROHM Semiconductor Europe has its head office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa). For further information please contact

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