JP2002140076A - Presence transmission system for sound signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and effectively control signal processing for reproducing the presence of a sound and to control the presence of the sound linked with control over an image screen in real time. SOLUTION: A component of presence extracted from an original sound signal is sent separately from the original signal and a reception side reproduces the signal generated by synthesizing the component of presence of size corresponding to necessary presence with the original signal to obtain the presence of the sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reproducing a sense of presence of an audio signal, and more particularly to a signal transmission method on a sender side of information transmission and a signal synthesis method on a reception side. Signal processing and control software for expressing and transmitting the realism of an AV work when a communication line represented by the Internet is used as a media, and expressing the realism of an AV work using a computer bus line as a medium There are signal processing and control software for transmitting and receiving information, and signal processing and control software for transmitting and receiving information via a storage medium represented by a TV game system.

[0002]

2. Description of the Related Art For information transmission using a communication line, in both hardware and software, image data communication has been mass-produced, speeded up, and compressed. It is getting pretty high. On the other hand, at present, the effect of the presence that appeals to the auditory sense and the effect of the presence corresponding to the degree of freedom of scene selection on the receiver side has not been examined as much as the content of the image signal. When reproducing the presence of sound, the receiving side generally selects some signal samples sent from the transmitting side, or incorporates a filter algorithm for reproducing the presence on the receiving side. is there. The former cannot change the sense of presence flexibly by the will of the receiving side. The latter either downloads an algorithm to change the presence,
Alternatively, the receiving side must have a predetermined algorithm. In any case, it is not easy or unusual to produce a sense of realism freely in conjunction with an image.

[0003]

[Definition of terms] The following terms are defined throughout the entire text including the claims.

[0004] The sense of presence of sound refers to not only the volume but also the sensation when a sound quality component that cannot be heard unless the sound source is close to the sound source is sensed. The degree of sound presence is the degree of a sound quality component that can be heard closer to the sound source.

[0005] The medium tone is a frequency of 300 Hz to 3000 H.
A range of about z is used as a guide. Low frequency is 300Hz
To a range of about 80 Hz. The treble refers to a frequency range of about 3000 Hz to 8000 Hz. The ultra-low sound is a frequency range from about 80 Hz to about 20 Hz. Ultra high frequency is from 8000 Hz to 20
A range of about 000 Hz is a standard.

[0006] It is assumed that addition is not mathematically exact, but is a function sufficient to make a practical device. Whether the operation such as addition is a digital operation or an analog operation is not the essence of the present invention.

The selection of a scene means that, for example, there is an image on a monitor, and the operation of enlarging or moving the image is operated by the receiver. An AV work means a work of a video game or a broadcast program using sound and images.

[0008]

SUMMARY OF THE INVENTION In information transmission, signal processing and control for reproducing a simple and effective acoustic realism. Control of image screen and real-time sound control linked in real time. As for the realism of an image, it is common practice to produce a sense of realism by using techniques such as wide-angle, telephoto, close-up photography, and left / right movement. Further, in the case of sound, since the scrutiny of the sense of realism is not performed as much as the image, the effect of the sense of realism is performed at most by the effect of the stereo or the volume operation. Because the production of sound presence is not something that anyone can recognize as much as images,
At present, it is not generally regarded as important.

[0009]

FIG. 1 is a block diagram for simply explaining the present invention, and shows an embodiment in which one original signal and one corresponding realism component are provided. .
S (A) is the code data of the acoustic signal A. F is a filter for extracting the presence component. The characteristics of the filter itself are not the essence of the present invention.

The output of F of the input signal S (A) is S (A)
A). S (AA) is the presence component of S (A). SC is a transmission control function for controlling transmission or recording of code data, and controls transmission so that the receiving side can identify and receive S (A) and S (AA). In practical machines,
The SC includes not only an audio signal but also a function for controlling transmission and reception of other signals. Media is a communication line and a recording medium. The RC receives signals from a communication line and a recording medium, and receives audio data S (A) and S (A) from the transmission side.
This is a reception control function for obtaining A). In a practical device, RC includes a function of transmitting and receiving not only an acoustic signal but also other signals.

P is a coefficient function for adjusting the degree of presence. The coefficient is k, and the output of P is k * S (AA).
Is a component of the degree of presence. MIX is the original signal S (A)
And an addition function of adding the presence component k * S (AA). The MIX output S (A) + k ^* S (AA) is a signal obtained by adding the presence component of the original signal to the original signal. When this signal is reproduced, a reproduced sound signal whose degree of presence depends on the value of the coefficient k is obtained.

In general, both the sender and the receiver of the information pass through a computer. In the case of a computer, the sound signal is stored as a data file, and the sound signal of the data file converted by a specific algorithm can be stored as another file, which can be transmitted to other devices via a communication line or bus line. It is also possible to classify the files according to a procedure determined from the received signal, combine them, and reproduce the resultant as an audio signal. Each function constituting the present invention is known. The essence of the present invention resides in that the presence component extracted from the original sound signal is sent separately from the original sound signal, and the reception side synthesizes and reproduces the presence component with the original signal.

The function of signal processing and control for transmitting and receiving the original signal and the presence component in a separated manner is not the essence of the present invention.

The means for synthesizing the original signal and the presence component on the receiving side and the means for converting a signal containing the presence component into a sound wave are not essential to the present invention.

FIG. 2 shows an embodiment for obtaining a realistic component. The means for extracting the presence component is not the essence of the present invention, but is important in explaining the feasibility of reproducing the presence according to the present invention. A brief description will be given.

In general, since fine acoustic characteristics are extremely complicated, precise definition is difficult. However, if we look at any acoustic characteristics macroscopically, the more the sound deviates from the middle sound and goes from the bass to the ultra-low sound, and from the middle sound and goes from the high sound to the ultra-high sound, the sound wave propagation, In the process of converting a sound wave into an electric signal and converting an electric signal into a sound wave, a large amount of the presence component is attenuated. Attenuation of bass is mainly affected by diffraction effects, and attenuation of treble is mainly affected by directivity and energy loss. When such an attenuation component is restored using a filter, the sense of reality is restored. There are many methods for extracting this attenuation component. The description with reference to FIG.
/ JP97 / 03815.

S (a) is an original signal, and II is a low frequency range attenuation component extraction part of the original signal, which is constituted by an integrating function. II
Is S (al). DD is a high frequency range attenuation component extraction part of the original signal, and is constituted by a differentiation function. The output of DD is S (ah). MIX is S (al) and S (a
h) is added at an appropriate ratio. The output of the adder is kl ^* S (al) + kh ^* S (ah), which is the presence component.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

An information transmission system using a communication line typified by the Internet, an information transmission system via a recording medium typified by a TV game, and an AV, which need to produce a sense of realism that changes with the operation of the receiver. Software for production systems.

[0020]

Although the present invention combines known techniques, a realism component is provided separately from the original signal, and it can be synthesized on the reproduction side according to the required degree of realism. It has the feature that it is extremely easy to operate the sound with the high degree of freedom in realism. The sender can transmit information linked to the image so that the receiver can enjoy a high degree of realism.

[0021]

[Brief description of the drawings]

FIG. 1 is an explanation of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of an embodiment for extracting a presence component.

[Explanation of symbols]

S (A) is the original signal F is the presence component extraction filter S (AA) is the presence component signal SC is the transmission control function Media is the communication line or data bus or recording medium RC is the reception control function P is the coefficient function k ^* S (AA) is the output signal of the coefficient function MIX is the addition function S (A) + k ^* S (AA) is the output signal of the addition function S (a) is the original signal II is the integration function DD is the differentiation function S (al) is low The presence component S (ah) of the region is the presence component of the high range Kl ^* al + kh ^* ah is the output signal of the addition function

Claims (3)

[Claims] An encoded audio signal or a plurality of audio signals (hereinafter referred to as an original signal) and one or a plurality of signals (hereinafter referred to as a real signal) obtained by subjecting the original signal to arbitrary signal processing. A sound signal transmission control method characterized by having a function of transmitting the signal to a communication line, writing to a recording medium, or transmitting the signal to a data communication bus in a form that can be distinguished from the original signal. 2. A function or addition for receiving an original signal and a presence component transmitted by the signal transmission method according to claim 1, and adding the presence component or the presence component having a changed size to the original signal. A sound signal synthesizing method having a function of generating a control signal of the following. 3. A sound signal synthesizing method according to claim 2, wherein the function of changing the magnitude of the presence component is linked to a control signal of an image displayed on a monitor screen of a computer.