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Acoustic signal reproducing method

A sound signal and replay technology, applied to frequency/direction characteristic devices, electrical components, two-channel systems, etc., can solve problems such as reducing spatial intermodulation distortion and reducing intermodulation distortion

Inactive Publication Date: 2007-01-17
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The intermodulation distortion elimination method of the present invention is constituted as follows: in the audio signal playback method of a portable terminal device containing at least two speakers in the casing, including: for the input signal input to the speaker, reduce the The processing step 1 of the spatial intermodulation distortion generated in the ear space; the processing step 2 of reducing the intermodulation distortion generated between the speakers in the housing for the signal after the processing step 1, wherein the input signal requires a stereo 3D audio and video positioning function can be realized in the portable terminal device

Method used

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Embodiment 1

[0018] As a result of research by the inventors, it has been determined that the following phenomenon occurs: when the rear air chambers are shared in order to reduce the size of the portable terminal device, the sound waves reproduced from one speaker are acoustically combined in the casing and leak out. to another speaker. This acoustic combination is called in-cabinet intermodulation distortion. figure 1 This phenomenon is modeled in the left part of . In addition, it has also been determined that a phenomenon occurs in which sound waves reproduced from one speaker are combined at the other ear when transmitted to one ear of the original listener, and leak to the other ear. This acoustic combination is called spatial intermodulation distortion. figure 1 The right part of , models this phenomenon.

[0019] figure 1 The first speaker 1R (one speaker) and the second speaker 1L (another speaker) shown are provided in the casing of the portable terminal not shown, and the re...

Embodiment 2

[0073] In Embodiment 1, the first case processing device 3LR and the second case processing device 3RL were used as the processing procedure for reducing crosstalk in the case, but in this embodiment, the description will be given using the first case processing device described later. In the case of the body direct processing device 5RR, the second shell direct processing device 5LL, the first shell cross processing device 6LR, and the second shell cross processing device 6RL. In addition, for the playback of intermodulation distortion in the casing, due to the figure 1 same, so the description is omitted here. In addition, for the playback of spatial intermodulation distortion, due to the figure 1 same, so the description is omitted here. In addition, since the spatial intermodulation distortion processing device is the same as the left part in FIG. 2 , description is omitted here.

[0074] 3 is a schematic diagram of an audio signal reproducing circuit used in a portable...

Embodiment 3

[0116] In Embodiment 1, the first casing processing device 3LR and the second casing processing device 3RL were used as processing steps for reducing crosstalk in the casing, but in this embodiment, the first casing processing device described later will be described. The case of the case multiplication processing device 8LR and the second case multiplication processing device 8RL.

[0117] In addition, for the playback of intermodulation distortion in the casing, due to the figure 1 same, so the description is omitted here. For the playback of spatial intermodulation distortion, due to the figure 1 same, so the description is omitted here. In addition, since the processing of spatial intermodulation distortion is the same as the left part in FIG. 2 , description is omitted here.

[0118] Figure 4 It is a schematic diagram of an audio signal reproducing circuit used in the portable terminal device according to the third embodiment of the present invention. Such as Figu...

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Abstract

There has been conventionally filters including a transfer function for canceling the crosstalk component from a speaker to the left or right ear of the listener. However, the crosstalk between the speakers in the case of a portable terminal cannot be appropriately reduced. Therefore, when the input signal is expected to have a stereophonic effect, portable terminals have no 3-D sound image positioning function. A crosstalk canceling method of this invention comprises a processing step 1 of reducing the spatial crosstalk caused in the space from the speaker to the ear of the listener in relation to the input signal inputted into the speaker and a processing step 2 of reducing the crosstalk caused between the speakers in the case in relation to the signal passed through the processing step 1.

Description

technical field [0001] The present invention relates to an audio signal reproduction method that reduces crosstalk generated when a portable terminal device is used. Background technique [0002] The feature of the existing intermodulation distortion canceller is: to the transfer function that the imaginary audio image corresponding to the input signal reaches the listener's right ear or left ear, the superposition is used to eliminate the intermodulation distortion of the right ear or left ear of the audience. The filter of the transfer function. [0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. H09-327099 (pages 1 to 2) [0004] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2002-111817 (pages 1-2, pages 9-10) [0005] At present, there is a filter superimposed with a transfer function for canceling the crosstalk distortion component from the speaker to the listener's right or left ear, but the crosstalk between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S1/00H04S5/02H04R1/20
CPCH04S1/002
Inventor 木村胜松冈文启
Owner MITSUBISHI ELECTRIC CORP