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Infra bass

infra-bass technology, applied in the direction of transducer details, electrical transducers, analog recording/recording, etc., can solve the problem that the amplitude of the sub-harmonics generator is not linear with the input voltage, and achieve the effect of improving such a bandwidth extension devi

Inactive Publication Date: 2005-12-22
AARTS RONALDUS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is a device that extends the bandwidth of an audio signal. It uses filters and creates two adapted signals, which are compared with the original signal. The adapted signal that best matches the original signal is selected and sent to the output. This device produces a smoother and more accurate representation of the original signal. Additionally, it creates sub-harmonics that have no discontinuities, which improves the overall quality of the audio signal."

Problems solved by technology

A disadvantage of the known sub-harmonics generator and the known bandwidth extension device is that the amplitude of the sub-harmonics generator is not linear with the input voltage.

Method used

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Examples

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Embodiment Construction

[0017]FIG. 1 shows an example of a bandwidth extension device BD according to the invention. On an input I, the bandwidth extension device receives an input signal, for example, an audio signal. The input I is coupled to a first and a second band-pass filter BPF11 and BPF12, respectively. These band-pass filter form two band-limited parts from the (narrow-band) input signal, for example, one of 300-600 Hz (BPF11) and one of 300-450 Hz (BPF12).

[0018] The output of the band-pass filter BPF11 is coupled to a harmonics generator HG1 and the output of the band-pass filter BPF12 is coupled to a harmonics generator HG2.

[0019] The two harmonics generators HG1 and HG2 respectively produce two separate streams of harmonics of the selected frequency bands. Frequency components in the first band will be extracted as if the lowest harmonic in the narrow-band signal is the second harmonic, frequency components in the second band will be extracted as if the lowest harmonic in the narrow-band sig...

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Abstract

To improve the aural sensation from an input signal of an audio reproduction system a bandwidth extension device can be used. The bandwidth extension device includes a first and a second signal path and an analyzer for selecting the created signal which fits most for the current input signal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation of U.S. patent application Ser. No. 09 / 841,958, filed Apr. 25, 2001.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a bandwidth extension device comprising an input for receiving an input signal, filter means for filtering the input signal, creating means for creating an adapted signal with a lower frequency part than the input signal. [0004] The invention further relates to an audio reproduction system comprising such a bandwidth extension device. [0005] 2. Description of the Related Art [0006] Such a device is known from European Patent Application No. EP-A-0240286, corresponding to U.S. Pat. No. 4,790,014. To improve the aural sensation in low-pitched (that is: signals in the very low frequency band) sound reproduction by an audio reproduction system or the like, a sub-harmonics generator is used to create this low-pitched signal. In this way, a lower pitch signal is...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03G5/22H04R3/04H04R3/00
CPCH03G5/22G11B20/02
Inventor AARTS, RONALDUSLARSEN
Owner AARTS RONALDUS
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