This content is not included in your SAE MOBILUS subscription, or you are not logged in.
New-AFB Automotive Sound System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1996 by SAE International in United States
Annotation ability available
With conventional automotive systems overall music sound quality depends on whether car is running or not. It is so because the low frequency component of the sound is masked by the road noise when running.
To develop a system in which the sound is not easily masked by the road noise, we have paid attention to the difference between the speaker velocity changes (acceleration characteristics) due to the road noise and those of the music signal, and to the attack transient which is important to identify the timbre.
The rise time response of the loudspeaker is a key factor for improvement, and conventional speakers have limitations in this regard.
In 1995 the authors presented the New-AFB System1) in the SAE convention, which explained the technology and advantages of acoustic feedback in achieving flat sound pressure vs. frequency and enabling substantial improvement in response time of the speaker. Since then we have applied this to develop an optimum system for automobile use.
The newly developed system has a microphone, which detects the control signal as well as the road noise, on the rear panel of the speaker. In addition to the effect of New-AFB, the road noise is reduced by processing the detected signals.
- Shinichi Ohki - Matsushita Electronic Components Co., Ltd.
- Fumiyasu Konno - Matsushita Electronic Components Co., Ltd.
- Yoshio Nakamura - Matsushita Electronic Components Co., Ltd.
- Sumio Ishihara - Matsushita Electronic Components Co., Ltd.
- Toshihiko Ohashi - Matsushita Electronic Components Co., Ltd.
- Robert A. Finger
- Syuji Ido
CitationOhki, S., Konno, F., Nakamura, Y., Ishihara, S. et al., "New-AFB Automotive Sound System," SAE Technical Paper 960197, 1996, https://doi.org/10.4271/960197.
- Ohki Shinichi Konno Fumiyasu Ishihara Sumio New Acoustic Feedback System (SAE TECHNICAL PAPER 950184 )
- Maki Tetsuo Hamada Kazunari The Quantization and Improvement of Road Noise Sound Quality No. 910-41 (Journal of the Japan Society of Mechanical Engineers)
- Namba Seiichiro Measurement and evaluation method of sound tone and application example 94 97 117 118 Ouyo Gijutsu Shuppan
- Acoustical Society of Japan Hearing and Acoustic Psychology 109 Corona
- Namba Seiichiro Measurement and Evaluation Method of Tone Quality and Its Application Examples 71 Ouyo Gijutsu Shuppan