JP2005295416A - Stereo sound processing apparatus and stereo sound processing method - Google Patents

Abstract

An object of the present invention is to effectively give a three-dimensional orientation to sound information inputted from a sound signal reading device.
A sound source coordinate controller 1 outputs spatial coordinates for locating a sound source as time-series information, and a coordinate fluctuation adding device 2 adds “fluctuation” to the sound source coordinates output from the sound source coordinate controller. The signal feature quantity computing device 3 computes a sound signal feature quantity that gives a sense of localization so that sound can be heard from the direction of the sound source coordinates input from the coordinate fluctuation adding device, and the sound signal feature quantity adjusting device 4 is a sound signal feature. The feature amount of the sound signal input from the sound signal reading device is adjusted according to the sound signal feature amount calculated by the amount calculation device.
[Selection] Figure 1

Description

  The present invention relates to a stereophonic sound processing apparatus and a method for performing stereophonic sound processing that gives a three-dimensional orientation to sound information such as music and voice, and reproduction thereof.

A number of surround sound effect processing technologies, including the ability to give stereophonic localization to sound signals by adding sound signal processing using the head-related transfer function to achieve stereolocation in headphone playback. Has been developed (see, for example, Non-Patent Document 1).
Okamoto et al. “Sound image rendering system for headphone” (IEEE transaction Consumer Electronics, 43, 689-693, 1997)

  However, the sound localization feeling is as low as about 20 degrees even in the forward direction, and there are many individual differences in the way of feeling, so there are many cases where the three-dimensional sound image localization is not noticed.

  There is a demand for the development of a new technology that effectively recognizes the sound image localized by the conventional technology.

  An object of the present invention is to provide a three-dimensional sound processing apparatus and a three-dimensional sound processing method that can effectively give a three-dimensional orientation to sound.

  Giving a person a three-dimensional sense of sound acoustically means that the person is aware of the localization of the sound image itself (sound stimulation rises to human consciousness). Stimulation needs to reach the cortex. In human hearing, changes in sound stimulation are filtered by the action of FM neurons or the like, and only the change reaches the cerebral cortex. Therefore, in order to make a sound stimulus notice to a person, it is effective to give a non-stationary stimulus that constantly changes.

  The present invention pays attention to the above, and causes a slight change in the sense of localization by distorting the localization of the sound image on the spatial coordinates where the sound image is localized, thereby making the stereo image localization of the sound image itself human. The above-mentioned problem is solved by making it easy to notice, and is characterized by the following apparatus and method.

(1) A stereophonic sound processing device that provides a three-dimensional sound effect to sound information input from a sound signal reading device,
A sound source coordinate controller that outputs the spatial coordinates to which the sound source should be localized as time series information,
A coordinate fluctuation adding device for adding "fluctuation" to the sound source coordinates output from the sound source coordinate controller;
A sound signal feature quantity computing device that computes a sound signal feature quantity that provides a sense of localization so that sound can be heard from the direction of the sound source coordinates input from the coordinate fluctuation adding device;
And a sound signal feature amount adjusting device for adjusting a feature amount of the sound signal input from the sound signal reading device in accordance with the sound signal feature amount calculated by the sound signal feature amount calculating device.

(2) In the above (1), a memory for storing any one of a sound signal, a sound source coordinate, and a coordinate fluctuation amount to be added, or a combination thereof;
And a timer for reading out each information from the memory in synchronization with the sound source coordinate controller, a coordinate fluctuation adding device, and a sound signal reading device.

  (3) In the above (1), any one of the sound signal, the sound source coordinates and the coordinate fluctuation amount to be added, or a combination thereof, can be input to the sound signal reading device, the sound source coordinate controller, and the coordinate fluctuation adding device. A device is provided.

  (4) In the above (1), any one of a sound signal, a sound source coordinate and a coordinate fluctuation amount to be added or a combination thereof is received via a network, and the sound signal reading device, the sound source coordinate controller, and the coordinate fluctuation adding device are received. And a network device for inputting to the network.

  (5) In the above (1), any one of a sound signal, a sound source coordinate and a coordinate fluctuation amount to be added, or a combination thereof is received via a network and synchronized with a sound signal input to the sound signal reading device. And a network device for inputting to the sound source coordinate controller and the coordinate fluctuation adding device.

  (6) The stereophonic sound processing device according to any one of (1) to (5) above, further comprising a sounding device that reproduces an output from the sound signal feature amount adjusting device as sound.

(7) A stereophonic sound processing method for providing a three-dimensional sound effect to sound information input from a sound signal reading device,
The sound source coordinate controller outputs the spatial coordinates where the sound source should be localized as time series information,
The coordinate fluctuation adding device adds “fluctuation” to the sound source coordinates output from the sound source coordinate controller,
The sound signal feature quantity computing device computes a sound signal feature quantity that provides a sense of localization so that sound can be heard from the direction of the sound source coordinates input from the coordinate fluctuation adding device,
The sound signal feature value adjusting device adjusts the feature value of the sound signal input from the sound signal reading device according to the sound signal feature value calculated by the sound signal feature value calculating device.

  As described above, according to the present invention, on the spatial coordinates where the sound image is localized, the localization of the sound image is fluctuated to cause a minute change in the localization feeling, thereby allowing the person to change the three-dimensional localization of the sound image itself. In order to make it easy to notice, it is possible to effectively give a three-dimensional orientation to the sound.

  FIG. 1 shows an apparatus configuration example corresponding to claim 1 of the present invention. The sound source coordinate controller 1 outputs the spatial coordinates where the sound source should be localized as time series information.

  In the conventional technique, the sound source coordinates output from the sound source coordinate controller 1 are directly input to the sound signal feature amount calculation device 3 for calculation. In this embodiment, the position of the sound image localized by the conventional technique is calculated. The sound image localization is changed by swinging the back and forth, right and left or by drawing an arc, and the auditory stimulation reaches the cerebral cortex and the existence of the sound image localization information is effectively realized.

  The coordinate fluctuation adding device 2 adds “fluctuation” to the input coordinate information. The addition of the “fluctuation” causes the position of the sound image to simply vibrate or arc in the horizontal direction as described above, but may be another vector or may be changed in a complicated manner.

  The sound signal feature quantity computing device 3 computes a sound signal feature quantity based on the sound source coordinates to which fluctuation has been added, and outputs it to the sound signal feature quantity adjusting device 4. The sound signal feature amount adjusting device 4 adjusts the feature amount with respect to the sound signal separately input from the sound signal reading device 5 according to the input sound signal feature amount.

  With the above-described functional configuration, a sound signal in which the sound image localization coordinates fluctuate is generated, and stereophonic sound processing that emphasizes a sense of localization compared to the conventional art can be realized.

  FIG. 2 shows an apparatus configuration example corresponding to claim 2 of the present invention. 1 differs from FIG. 1 in that sound signals, sound source coordinates, and coordinate fluctuations are read out from the internal memory 6 in synchronization with the timer 7.

  With this functional configuration, it is possible to match the progress of music and the localization of the sound signal, and edit the spatial performance content that emphasizes the localization feeling of the music than before.

  FIG. 3 shows an apparatus configuration example corresponding to claim 3 of the present invention. 1 is different from FIG. 1 in that a sound source coordinate and coordinate fluctuation can be input by a person using the input device 8.

  With this functional configuration, it is possible to design the localization of the sound image almost in real time as the music progresses.

  FIG. 4 shows an apparatus configuration example corresponding to claim 5 of the present invention. 1 is different from FIG. 1 in that sound signals, sound source coordinates, and coordinate fluctuations are received from an external network via the network device 9 and read out in synchronization.

  With this functional configuration, it is possible to edit the spatial performance content that matches the progress of the music and the localization of the sound signal and emphasizes the localization feeling of the music in the network environment.

  It is also possible not to synchronize the input from the network, in which case the apparatus corresponds to claim 4 of the present invention.

  Also, the functional configurations of FIGS. 1 to 4 are not exclusive, and the coordinate coordinates are manipulated by the input device 8 while taking in music from the network, and the coordinate fluctuations stored in the memory 6 are used. Combination configurations are also possible.

  FIG. 5 shows an apparatus configuration example corresponding to claim 6 of the present invention. 4 is different from FIG. 4 in that the processed and output sound signal is reproduced as sound by the sound generator 10.

  With this functional configuration, it becomes possible to perform live performance in a network environment in a network environment that matches the progress of music and the localization of sound signals, and emphasizes the localization feeling of the music than before.

  Note that the functional configurations of FIGS. 1 to 5 described above are examples of a single channel for simplicity. In either case, a multi-channel configuration such as two stereo channels or 5.1 surround channels can be configured in the same manner.

The structural example of the stereophonic sound processing apparatus which shows embodiment of this invention. The structural example of the stereophonic sound processing apparatus which shows other embodiment of this invention. The structural example of the stereophonic sound processing apparatus which shows other embodiment of this invention. The structural example of the stereophonic sound processing apparatus which shows other embodiment of this invention. The structural example of the stereophonic sound processing apparatus which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sound source coordinate controller 2 Coordinate fluctuation addition apparatus 3 Sound signal feature-value calculation apparatus 4 Sound signal feature-value adjustment apparatus 5 Sound signal read-out apparatus 6 Memory 7 Timer 8 Input device 9 Network device 10 Sound generation apparatus

Claims (7)

A stereophonic sound processing device that gives a three-dimensional sound effect to a sound signal input from a sound signal reading device,
A sound source coordinate controller that outputs the spatial coordinates to which the sound source should be localized as time series information,
A coordinate fluctuation adding device for adding "fluctuation" to the sound source coordinates output from the sound source coordinate controller;
A sound signal feature quantity computing device that computes a sound signal feature quantity that provides a sense of localization so that sound can be heard from the direction of the sound source coordinates input from the coordinate fluctuation adding device;
A sound signal feature amount adjusting device for adjusting a feature amount of a sound signal input from the sound signal reading device according to the sound signal feature amount calculated by the sound signal feature amount calculating device;
A stereophonic sound processing apparatus comprising: The memory according to claim 1, wherein any one of a sound signal, a sound source coordinate, and a coordinate fluctuation amount to be added, or a combination thereof, is stored.
A timer for reading out each information from the memory in synchronization with the sound source coordinate controller, a coordinate fluctuation adding device, and a sound signal reading device;
A stereophonic sound processing apparatus comprising:   The input device according to claim 1, further comprising: an input device capable of inputting and setting any one of a sound signal, a sound source coordinate, and a coordinate fluctuation amount to be added, or a combination thereof to the sound signal reading device, the sound source coordinate controller, and the coordinate fluctuation adding device. A stereophonic sound processing apparatus.   2. The network according to claim 1, wherein any one of a sound signal, a sound source coordinate, and a coordinate fluctuation amount to be added, or a combination thereof is received via a network and is input to the sound signal reading device, the sound source coordinate controller, and the coordinate fluctuation adding device. A stereophonic sound processing apparatus comprising a device.   2. The sound source coordinates according to claim 1, wherein any one of a sound signal, a sound source coordinate, and a coordinate fluctuation amount to be added, or a combination thereof is received via a network and synchronized with a sound signal input to the sound signal reading device. A stereophonic sound processing apparatus comprising a network device for inputting to a controller and a coordinate fluctuation adding apparatus.   The stereophonic sound processing apparatus according to any one of claims 1 to 5, further comprising a sounding device that reproduces an output from the sound signal feature amount adjusting apparatus as sound. A stereophonic sound processing method for providing a three-dimensional sound effect to a sound signal input from a sound signal reading device,
The sound source coordinate controller outputs the spatial coordinates where the sound source should be localized as time series information,
The coordinate fluctuation adding device adds “fluctuation” to the sound source coordinates output from the sound source coordinate controller,
The sound signal feature quantity computing device computes a sound signal feature quantity that provides a sense of localization so that sound can be heard from the direction of the sound source coordinates input from the coordinate fluctuation adding device,
The sound signal feature amount adjusting device adjusts the feature amount of the sound signal input from the sound signal reading device according to the sound signal feature amount calculated by the sound signal feature amount calculating device.
A stereophonic sound processing method characterized by the above.

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