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Audio information changover method, program and device and video/audio format, coder
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A technology of audio information and audio conversion, which is applied in the direction of instruments, sound-generating devices, speech analysis, etc., and can solve problems such as the impossibility of changing the listening point
Inactive Publication Date: 2004-05-26
SOCIONEXT INC
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[0007] However, in the multi-channel (such as 5.1-channel, etc.) audio system for playing DVD in the prior art, it is impossible to change the listening point obtained by an audio stream
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no. 1 example
[0077] Fig. 1 is a schematic diagram describing a first embodiment of the present invention.
[0078] In FIG. 1 , a virtual listening point 101 is determined in a screen 100 . Also, assume that a video object 1 having audio information is moving from left to right of the screen 100 . Then, if the coordinate value of the virtual listening point 101 is set to (x1, y1, z1), then the current position of the object 1 in Fig. 2 is set to P1 (xa, ya, za), and the position after a period of time t is set to P2(xb, Yb, zb), the vector between them is given by equation (1).
[0079] [Formula 1]
[0080] P 1 P 2 → = ( xb - xa , yb - ya , zb - za ) - - - ( ...
no. 2 example
[0094] Fig. 3 is a schematic diagram describing a second embodiment of the present invention.
[0095] In the first embodiment described above, the velocity of the object 1 is calculated from the coordinate information, and the frequency of the sound heard at the virtual listening point 101 is changed based on the information. However, such calculations are not necessary if Object 1 includes velocity information in previous time units. In this embodiment, if the video / audio format has speed information previously encoded by an encoder etc., such speed information needs to be extracted first, and then the speed heard at the virtual listening point is calculated on the basis of the extracted information. the frequency of the sound.
[0096] In the video / audio format shown in Fig. 3, velocity information of objects 1, 2...n is available. Same as the first embodiment, if the velocity of the object 1 is set to V1, the velocity component V1' in the direction from the object 1 to t...
no. 3 example
[0106] Fig. 5 is a schematic diagram describing a third embodiment of the present invention.
[0107] In FIG. 5, it is assumed that the virtual listening point 102 moves to the right on the screen. In addition, it is assumed that the video object 2 with audio information is not moving. If the coordinates of the object 2 are set as (x1, y1, z1), as shown in Figure 5, the current position of the virtual listening point 102 is set as P1 (xa, ya, za) in Figure 5, and the position setting after time t is P2(xb, yb, zb), and the vector between them can be expressed by equation (7).
[0108] [Formula 7]
[0109] P 1 P 2 → = ( xb - xa , yb - ya , zb - za ) - - - ...
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Abstract
The present invention provides an audio information transforming method, a program product, a device, an encoder, and an video / audio format utilized therein, which are capable of providing an audio information by adjusting the Doppler effect caused by movement of the object, in response to change of the listening point. In the invention, a virtual listening point is set at a position different from a basic listening point where a listener listens to a sound of an object, then a velocity of the object observed from the virtual listening point is calculated based on position information of the virtual listening point and position information of the object. Then, an audio frequency of an audio heard at the virtual listening point is changed based on the calculated velocity. For example, the frequency of the sound is increased if the object approaches the virtual listening point, and the frequency is decreased if opposite.
Description
technical field [0001] The present invention relates to an audio information conversion method, video / audio format, encoder, audio information conversion program, audio information conversion device, which are used in a video / audio format such as MPEG with video information and audio information per object (Moving Picture Experts Group) 4 format, or a DVD (Digital Versatile Disc) format having video / audio information for each scene. Background technique [0002] In recent years, DVD-based or broadband-based video streaming is showing promise, increasing the opportunities for processing video / audio formats at home. In particular, more and more people enjoy multi-channel audio due to popularization of DVD and cheaper audio equipment such as AV amplifiers. In DVD, MPEG 2 is used as a video recording system, and Dolby (Dolby) Digital System (AC-3), DTS (Digital Theater System), Linear PCM (Pulse Code Modulation), MPEG Audio, etc. are used as an audio recording system . Eight ...
Claims
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