BD34602FS-M’s audio design technology means minimal noise says Rohm

A car audio sound processor from Rohm Semiconductor, the BD34602FS-M, is based on audio quality design technology that ensures faithful reproduction with minimal noise, says the company.

The BD34602FS-M sound processor is capable of high resolution audio playback that performs volume adjustment and audio mixing for car audio and navigation systems requiring high sound quality.

The recent proliferation of quieter cabins and higher resolution sound sources, due to the introduction of EVs and PHVs has increased demand for more accurate audio representation. However, audio SoCs, which comprise the core of car audio systems, are trending towards lower voltages following greater process miniaturisation, reducing the size of audio signals that can be supported. This increases relative floor noise, requiring low noise, high fidelity analogue volume.

Rohm Semiconductor has expanded its line-up of sound processors with the BD34602FS-M, which was developed using proprietary sound quality design technology. Class-leading characteristics such as low 0.004 per cent distortion and 3.1-microVrms floor noise make it possible to extract the full data from sound sources, improving spatial representation (location of sound source and perceived distance), says the company. The result is improved car audio quality, while promoting the adoption of high resolution sound sources and a reduction in cabin noise.

The BD34602FS-M audio quality technology extracts the full data from audio sources by optimising 28 unique parameters centred on circuit configuration and electrical characteristics that have been shown to have an effect on IC sound quality. This enables accurate spatial representation (perceived distance and location of sound source).

The processor reduces IC mid-point bias circuit noise by approximately 20 per cent and decreases noise generated low-frequency noise generated in the volume circuit by up to 10x.

A built-in mixing circuit integrates original popping noise reduction technology, and there is also an integral interrupt function (mixing) for both voice navigation and hands-free modes.

Generally, when turning mixing on/off unwanted popping noise may occur, but the advanced switching technology minimises these popping noises, says Rohm.


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