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Bass management systems

A bass management and low-frequency technology, applied in two-channel systems, stereo systems, quasi-stereo systems, etc., can solve problems such as quality degradation, short transmission distance, and limitations of the central speaker

Active Publication Date: 2005-11-23
HARMAN INT IND INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In another example, when the center speaker is placed in the dashboard, the size of the center speaker is limited due to space constraints within the dashboard
These location and size constraints create problems given the short distance sound can travel before reaching the listener or walls in a car
Due to these factors, multichannel surround processing systems can suffer severe quality degradation when implemented in non-optimal listening environments

Method used

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Embodiment Construction

[0036] An example of sound processing system 100 is in figure 1 displayed in . The sound processing system 100 may include a signal source 101 , a surround processing system 102 , a post-processing module 104 and an electronic-acoustic converter 106 . The surround processing system 102 may include a bass management module 110 , a matrix decoder module 120 , a sound mixer 150 and an adjustment module 180 . While particular configurations are shown, other configurations, those having fewer or additional components, may also be used. For example, surround processing system 102 may not include bass management module 110 and / or mixer 160 .

[0037] In the sound processing system 100 , a signal source 101 provides a digital signal to a bass management module 110 . Alternatively, the signal source 101 may directly provide part of the digital signal to the matrix decoder module 120 , while the other part of the signal goes to the post-processing module 104 and perhaps to the mixer ...

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Abstract

Sound processing systems have been developed that create a surround effect without quality degradation experienced by known sound processing systems in non-optimum listening environments. The sound processing systems may include matrix decoding systems that manipulate input signals prior to converting them into a number of output signals so that the output signals are a function of a greater number of input signals. These sound processing systems may also or alternately include a base management system that from the input signals preserves the low frequency components of the input signals in separate channels. Both the matrix decoding systems and base management systems may also produce additional signals. Further, the matrix decoding and base management systems may be implemented separately or jointly in vehicular sound systems.

Description

technical field [0001] The present invention generally relates to sound processing systems. More particularly, the present invention relates to sound processing systems having multiple outputs. Background technique [0002] Consumer expectations for sound quality in audio or sound systems are constantly increasing. In general, such consumer expectations have grown dramatically over the past decade, and consumers now expect high-quality sound systems in a variety of listening environments, including vehicles. Additionally, the number of potential audio sources has increased. Audio may be obtained from sources such as the radio, compact disc (CD), digital video disc (DVD), super audio compact disc (SACD), tape player, and similar audio sources. Although sound systems have traditionally supported two-channel ("stereo") formats, many sound systems now include surround processing, which creates the perception that sound is coming from all directions around the listener (a "sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S7/00H04SH04S1/00H04S3/00H04S3/02H04S5/02
CPCH04S3/02H04R2499/13H04S3/008H04S7/307H04S3/002H04S7/302H04S1/00H04S3/00
Inventor B·F·爱尔德H-J·尼兹本
Owner HARMAN INT IND INC
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