Asahi Kasei Microdevices (AKM) offers solutions for sound quality improvement, sound effects and entertainment to in-vehicle infotainment (IVI). By using D/A converters for sound quality improvement and audio & voice processors for sound effects and entertainment, your car spaces are filled with the most suitable sound. Would you like to make a comfortable and enjoyable drive with AKM's audio ICs ?

Sound quality improvement

The inside of a car is like an audio room - driving with real sound

"We want to enjoy a drive while listening to music with high-quality sound"

AKM proposes D/A converters for your requests.
AKM's audio ICs including D/A converters are used in many high-end audio products. We apply this technology to the field of IVI, and we have a lineup of products optimized for in-vehicle use. With these audio ICs, high-quality audio system environment is created in the inside of running cars. Moreover, drivers and the crews can enjoy more comfortable and more pleasant driving.

Features of AKM's audio ICs

We use VELVET SOUND technology.

The VELVET SOUND technology is a name of our "sound philosophy" given to  audio devices provided by AKM and "architecture" and "core technology" realizing the philosophy. Please refer to the brand site for the details.

Features.

  • low distortion technology, OSR which controls noises out of the band
  • We developed the LSI manufacturing process for dedicated audio ICs. We achieve the sound quality improvement better than our previous products by controlling electrical margin and low level noises.

Please refer to the brand site for examples adopting the VELVET SOUND technology for in-vehicles use.

*We place the information of the page by the cooperation of the company. 

*Each listed name, company name and brand name are the trademark of the company or a registered trademark.

Lineup

Table 1 shows our D/A converters for vehicles. We prepare products depending on the number of the S/N ratio (vertical axis) and the channels (cross axle). As we develop our lineup including a variety of channels, our D/A converters contribute to realization of various configuration in IVI system.

Table 1 Lineup of D/A converters

Click on the product name to see the product information page
for specifications and data sheets for each product.

S/N  2ch 4ch 6ch 8ch
 117dB     
 115dB 

 108dB 

 


Sound effects

Achieving a comfortable audio experience - your own cabin space

"How can we improve sound in cars?”

For such a request, AKM offers audio & voice processors bringing sound effects. The sound effects become one of the important factors in the field of IVI. With audio & voice processors of AKM, you can experience driving spaces where sounds spread in front of you. AKM calls these original sound effects "Real Space Sound". We introduce the effects and the examples of "Real Space Sound" in vehicles.

The effect of "Real Space Sound" in vehicles

By effects of "Real Space Sound", the sound of steps is lifted, which enables driving time with a wide range, powerful and low tone. Figure 1 compares "Real Space Sound" OFF and ON.

in the case of "Real Space Sound" OFF

Live sound that has bias is poor.
No low tones and sharpness is poor.
Sounds at the position near the floor is poor.

in the case of "Real Space Sound" ON

Live sound that has a wide range is excellent.
Low tones are powerful and sharp is excellent.
Sounds at the appropriate position is excellent.

Figure 1 Comparing before “Real Space Sound” with after it

"Real Space Sound" has more effects, which are called 1. Car Space Compensation, 2. Sweet Position Adjustment.

1. Car Space Compensation

By measuring frequency characteristics in vehicles with a high-performance microphone, Car Space Compensation can

  • realize the revision of frequency characteristics of ideal spaces in cars
  • improve sharpness of sound
  • make up the low tone well

Figure 2 shows comparing before Car Space Compensation and after that.

Figure 2 Comparing before Car Space Compensation and after that.

2. Sweet Position Adjustment

You can choose an acoustic mode according to the number of the crews. We explain the examples: Driver Mode and All Passenger Mode in Figure 3.

With Driver Mode, a driver can enjoy the best sound experience by lifting clear sounds. Therefore, it is suitable at the time of driving alone. In contrast, All Passenger Mode can realize the situation that all the crews can enjoy sounds, which is suitable at the time of driving with your family or friends.

 

Figure 3 Comparison between Driver Mode and All Passenger Mode

Entertainment

More enjoyable time in vehicles - even karaoke while driving

"The long-time drive is boring, so you want to enjoy the time more.”

AKM proposes audio & voice processors for raising entertainment characteristics. 
You drive usually on listening to music and watching a movie. With audio & voice processors of AKM, sounds improving entertainment characteristics are realized even in vehicles.

Cinema mode
you can experience powerfulness
like being in a movie theater.

Club mode 
you can feel liveness in a jazz club.
 

Karaoke mode
you can enjoy karaoke during a dive.
 

What is a karaoke in vehicles ?

Choosing a karaoke mode, you can enjoy real karaoke even in vehicles. Preparing one microphone, you can experience karaoke by using music in car audio system or in your smartphone. 
It seems to be one choice while automatic driving is advancing now and how to spend the time in a car is changing. For example, in China, karaoke in a car is considered as one of the choices.

Realizing karaoke using IVI system in vehicles, we do as the following.

  • Stereo Audio Echo Canceller → You can fell pure music by cancelling echo.
  • Howling Canceller → It automatically detects a howling frequency and prevents howling. 
  • Hall Simulator → It enables you to raise your singing voice.
  • Vocal Remover → You can enjoy karaoke by using music without the original voice.

 

Lineup

Part Number Description Sound effects Karaoke
AK7735AVQ Dual DSP with 4 ch ADC, 4 ch DAC, 4 ch SRC Available -
AK7707VQ Multi Core DSP with SRC Available Available
AK7738AVQ Multi Core DSP with 5 ch ADC, 4 ch DAC, 8 ch SRC Available Available
AK7739VQ Multi Core DSP with 4 ch ADC, 4 ch DAC, 12 ch SRC Available Available