JPH04280198A - Effect sound generator - Google Patents

Abstract

PURPOSE:To localize a sound heard by a recipient properly automatically even when the position of the recipient with respect to the speaker is changed. CONSTITUTION:Position detection signals 801,802 generated from a position signal generator 800 carried by a receiver 950 are received by microphones 401,402, the signal from the microphones 401,402 is processed to calculate the position of the position signal generator 800, that is, the position of the receiver 950 and digital signal processing of the signal processing unit 100 is revised to localize the position of virtual sound sources 901,902 properly in matching with the movement of the receiver 950.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating sound effects in audio and games.

0002

2. Description of the Related Art In FIG. 4, reference numeral 120 is a sound source such as a CD (compact disc) device or an electronic musical instrument, which outputs an audio frequency analog signal. This audio analog signal is input to an AD converter (110), converted into a digital signal, and input to a signal processing device (100). A signal processing device (100) processes amplitude information and phase information for an input signal, and outputs a speaker (301) to be described later.
), (302), the acoustic sound source (901), (902) is localized on either side of the ear of the listener (950), It works to produce effects. Signal processing device (
The signal from 100) is input to the DA converter (130), the digital signal is converted to an analog signal, and the signal is input to the amplifier (200).
) and amplified. The signal from the amplifier (200) is output to speakers (301) and (302) and reproduced as audible sound by these speakers (301) and (302).
The receiver (950) hears the sound. Speaker (301)
, (302), the amplitude information and phase information of which are controlled by the signal processing device (100).
When 950) hears this sound, virtual sound sources (901) and (90
The sound appears to be coming from the location shown in 2).

0003

[Problem to be solved by the invention] In the prior art,
In FIG. 4, when the listener (950) moves slightly and the position where he/she hears the sound from the speakers (301), (302) changes, the virtual sound sources (901), (902)
0) had the disadvantage that it was not localized at an appropriate position. The present invention has been made in view of this point, and it is an object of the present invention to provide a sound effect generating device that can provide an appropriate sense of localization even if the position of the listener relative to the speaker changes.

0004

[Means and effects for solving the problem] Position detection signal sounds (801) and (802) emitted from a position signal generator (800) carried by a receiver (950) are transmitted to a microphone (401).
, (402), and this microphone (401), (
402) and processes the signal from the position signal generator (800).
), that is, the position of the listener (950), and by changing the digital signal processing of the signal processing device (100), the positions of the virtual sound sources (901) and (902) are moved by the listener (950). This is to properly localize the image according to the scene.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing one embodiment of the present invention. In FIG. 1, parts having the same functions as those shown in FIG. 4 are given the same reference numerals, and explanations of those parts will be omitted.

[0006] Two microphones (401), (402
) are installed at positions corresponding to the two speakers (301) and (302), for example, at positions close to each speaker, and are configured to receive signals generated from the position signal generator (800).

[0007] The position signal generator (800) is connected to the receiver (9).
50) and has a function of generating pulsed position detection signal sounds (801) and (802) outside the audible frequency range. The position detection signal sounds (801) and (802) are converted into electrical signals by microphones (401) and (402), and then input to the motion detection device (500). Motion detection device (
500) calculates the amount of movement of the receiver (803) from the difference in arrival time of the position detection signal sounds (801), (802) to the microphones (401), (402). The motion detection device (500) outputs a signal according to the amount of movement (803) to the motion compensation control device (600). The motion compensation control device (600) updates the internal parameters of the signal processing device (100) according to the movement amount (803). The signal processing device (100) performs digital signal processing on the signal from the sound source (120) according to the updated parameters, performs D/A conversion on the digitally processed signal, and outputs the amplifier (200) and speaker (301). ), (302
) to play sound. This allows the virtual sound sources (901) and (902) to be localized at positions appropriate for the receiver (950). Here, localizing the virtual sound source at an appropriate position means, for example, that the listener uses the speaker (30
1), (302), the same sound image and localization as those obtained when the user is at the original position can be obtained at the moved position.

[0008] By using a non-audio frequency signal sound such as an ultrasonic wave for the position detection signal sounds (801) and (802) of the position signal generator (800), it is possible to receive the sound effect originally generated by this device. It is possible to prevent the position detection signal sounds (801) and (802) from being mixed in with the sound effects when the person (950) listens to them.

Furthermore, in FIG. 1, a speaker (301)
, (302) are transmitted to the microphones (401), (4
02) as well. By using non-audio frequency signal sounds such as ultrasonic waves for the position detection signal sounds (801) and (802) of the position signal generator (800), the spectral components of the sound effect and the position detection signal sound (801), (802), as shown in FIG.
), the position detection signal sound (801
), (802) and time difference measuring section (5
03), the amount of movement (803) can be detected. In FIG. 3, 305 is a sound effect spectrum, 80
5 is the spectrum of the position detection signal sound, and since both spectra are separated in terms of bands, a band pass filter (
501) and (502), it is possible to easily extract only the components of the position detection signal sounds (801) and (802).

Furthermore, by using an LED or the like to output a light signal instead of sound as the position signal generating device (800), the sound effect will not be adversely affected. At this time, a light receiving element such as a photodiode is used instead of the microphones (401) and (402).

[0011]

Effects of the Invention In the sound effect generating device of the present invention, a position signal generating device (800), microphones (401), (402), and a microphone (400) carried by a receiver (950) are used.
The internal parameters of the motion detection device (500) and signal processing device (100) that detect the movement amount (803) of the receiver (950) from the signals from the motion detection device (500) Since there is a motion compensation control device (600) that is controlled by signals, even when the receiver (950) moves, by changing the parameters of the signal processing device (100), the receiver (950) can be localized to an appropriate position. can generate sound.

[0012] Furthermore, since the output signal of the position signal generator (800) in the sound effect generator is a signal sound outside of the audio frequency range, it does not affect the sound effect and is indistinguishable from the signal characteristics of the sound effect. It is easy to use a motion detection device (500
), the processing can be simplified and the amount of movement (803) can be detected with high accuracy.

Furthermore, in the sound effect generating device, the output signal of the position signal generating device (800) is made into a non-audio frequency signal sound, and in FIG. If built-in, only the signals from the position detection signal tones (801) and (802) will pass among the signals from the microphones (401) and (402), making it easier to process the time difference measurement unit (503) and The amount of movement (803) can be detected with even higher accuracy.

Furthermore, if the output signal of the position signal generator (800) in the sound effect generator is a signal other than sound, for example, an optical signal, interference with the sound effect is eliminated and the motion detector (50
The circuit configuration of the motion detection device (5) is simplified, and the motion detection device (5) is simplified.
00) processing accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing another example of the motion detection device used in the embodiment of FIG. 1;

FIG. 3 is a graph showing frequency spectra of sound effects and position detection signals.

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

120: Sound source 110: AD converter 100: Signal processing device 130: DA converter 200: Amplifier 301: Speaker 302: Speaker 305: Sound effect spectrum 401: Microphone 402: Microphone 500: Motion detection device 501: Bandpass filter 502: Bandpass filter 503: Time difference measurement section 600: Motion compensation control device 800: Position signal generator 801: Position detection signal sound 802: Position detection signal sound 805: Spectrum of position detection signal sound 901: Virtual sound source 902: Virtual sound source 950: Receiver

Claims (1)

[Claims] 1. Control means for localizing the position of a sound source at an arbitrary position in space by digital signal processing; position signal generation means for generating a position signal from the position of a receiver;
A detection means for detecting the position signal, a position detection means for detecting the position of the signal generation means from the signal position from the detection means, and a control means for controlling the localization of the sound source from the signal of the position detection means. A sound effect generating device characterized by comprising a control signal generating means for generating a control signal.