JPH05266634A - Method and apparatus for superposing audio data - Google Patents

Abstract

PURPOSE:To automatically produce a new data where main data is not erased by subdata by an arrangement wherein subaudio data is subjected to level change based on correcting information and then a main audio data is superposed thereon. CONSTITUTION:A subaudio data such as background music data is held at a subaudio holding section 2 and a correcting information table containing changing times and levels is stored at a correcting information holding section 3. Subaudio data outputted from the subaudio data holding section 2 is then corrected at a level correcting section 7 according to the correction table held at the correcting information holding section 3. A synthesizing section 10 takes in main audio data transmitted from a main audio data holding section 5 and synthesizes the main audio data and the sunaudio data subjected to level change at the level correcting section 7 to produce a new data which is held at a new audio data holding section 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superimposing method and a superimposing apparatus for a plurality of audio data, and particularly to two audio data such as audio data for presentation such as narration and background music (BGM). When superimposing audio data to obtain one audio data, the main audio data can be easily overlaid so that the main audio data is not overwhelmed by the sub audio data. Regarding things.

[0002]

2. Description of the Related Art Conventionally, like audio data for presentation, main audio data such as narration is secondary audio data such as BGM.
It is layered so that it will not be erased by.

Therefore, the conventional audio data superimposing method is to superimpose the sub audio data recorded at a lower level from the beginning to the end as compared with the main audio data, or record the sub audio data. At that time, considering the temporal length of the main audio data, the sub audio data that does not drown out the main audio data was created by superimposing it by lowering the level of the section that overlaps that portion and recording.

[0004]

By the way, in the above description, since the sub audio data is recorded at a low level so as not to drown out the main audio data from the beginning to the end, its effect when only the sub audio data is weak, For example, the effect of BGM may not be sufficient.

Further, in the above description, when the user creates the sub audio data to be overlaid, the degree of overlap between the main audio data and the sub audio data is grasped, and the recording level of the sub audio data is adjusted by a manual to obtain the main audio data. It is necessary to record with the level of the section to be overlapped with lower than that of the other sections, and this imposes a heavy load on the user. When the temporal size of the main audio data to be overlaid changes, the sub audio data is adjusted to the main audio data,
It was necessary to repeat the recording process by manual again.

Therefore, it is an object of the present invention to provide an audio data superimposing method and a superimposing device capable of automatically superimposing main audio data and sub audio data.

[0007]

In order to achieve the above object, according to the present invention, as shown in FIG. 1 (A), times T ₁ and T ₂ for superposing main audio data on sub audio data and The level change start time T ₀ and the level change end time T ₃ of the preceding and following sub audio data are prepared as correction information.

[0008]

Then, the level of the sub audio data is lowered at time T ₀ , and when the time T ₁ is reached, the main audio data is driven so as to become the level M. When the level M is reached, this is called the sub audio data. Overlap. Then, the level of the sub audio data is raised at time T _{2 when} the main audio data ends, and the level of the sub audio data is returned to the original level at time T ₃ .

Therefore, the level change control of the sub audio data is automatically performed based on the correction information, and the main audio data can be automatically overlapped based on this. When changing the length of the main audio data, the time item of the correction information should be changed accordingly.
This superposition editing can be done easily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a configuration diagram when the present invention is implemented by a computer.

In FIG. 2, 1 is a synthesis processing unit, 2 is a sub audio data holding unit, 3 is a correction information holding unit, 4 is a valid condition setting unit, 5 is a main audio data holding unit, and 6 is a new audio data holding unit. , 7 is a level correction section, 8 is a valid section detection processing section, 9 is a valid section information output section, and 10 is a combining section.

As shown in FIGS. 1A and 1B, the synthesizing unit 1 performs various operations for synthesizing the main audio data with the sub audio data. 1) A level correction unit 7 for changing the level as shown in FIG. 1A, a valid section for detecting that the main audio data is at a valid level M or higher as shown in FIG. It has a detection output unit 8, a valid section information output unit 9 for notifying that the main audio data is at a valid level, and a synthesizing unit 10 for synthesizing the sub audio data and the main audio data.

The sub audio data holding unit 2 is, for example, B
It holds sub audio data such as GM.
The correction information holding unit 3 holds the correction information table shown in FIG.

Data for controlling the level change information of the sub audio data is entered in the correction information table, and change start position data indicating T ₀ and T ₂ (for example, seconds) in FIG. 1A, The change end position data indicating T ₁ and T ₃ (for example, seconds) and the level data indicating the level to be changed at the end of the change are entered.

In the example of FIG. 2B, the level change is started after 120 seconds and the level is decreased by -50 dB by 150 seconds, and the level change is started after 520 seconds and the level is changed by 550 seconds. It is instructed to increase +50 dB and return to the original level.

The effective condition setting section 4 indicates what level the output level of the main audio data should be. For example, M is set as shown in FIG. 1 (B). This indicates that the output level of the main audio data is not effective unless it is MdB or higher. This is to prevent a noise section from being undesirably synthesized with the sub audio data if the main audio data is at a low level.

The main audio data holding unit 5 holds audio data such as narration at an exhibition or a new product information session. The new audio data holding unit 6 holds new audio data in which the main audio data is combined with the sub audio data in the combining unit 10.

Next, the operation of the embodiment of the present invention shown in FIG. 2 will be described. First, the sub audio data holding unit 2 holds the sub audio data, the correction information holding unit 3 stores a correction information table as shown in FIG. 2B, and the valid condition setting unit 4 sets the valid condition M, for example. Then, the main audio data holding unit 5 holds the main audio data. Then, the synthesis processing unit 1 is activated.

As a result, the level correction unit 7 sends the sub audio data output from the sub audio data holding unit 2 to the synthesizing unit 10 as it is. At this time, since the main audio data is not transmitted from the main audio data holding unit 5 to the synthesizing unit 10, the sub audio data is output to the new audio data holding unit 6 as it is and held.

The level correction unit 7 attenuates the level of the sub audio data by -50 dB from 120 seconds after to 150 seconds from the correction table held in the correction information holding unit 3,
It is also recognized that the level of the attenuated sub audio data is increased by +50 dB from 520 seconds to 550 seconds.

After the start of transmission of the sub audio data, 1
After 20 seconds, the sub audio data is attenuated so as to satisfy the above condition, and when 150 seconds have elapsed, the effective section detection processing unit 8 is instructed to start sending the main audio data, and the synthesis unit 10 is also started. Instruct. As a result, the main audio data from the main audio data holding unit 5 is input, but when the level is MdB or more, the effective section detection processing unit 8 determines that it is not silence or noise, and outputs it to the effective section information output unit 9. Notify this.

As a result, the effective section information output unit 9 outputs the effective section signal, so that the synthesis section 10 takes in the main audio data transmitted from the main audio data holding section 5 and outputs the level transmitted from the level correction section 7. It is combined with the changed sub audio data. Then, the synthesized new audio data is held in the new audio data holding unit 6.

In this way, when 520 seconds have passed,
The level correction unit 7 again starts the level change of the sub audio data, and instructs the synthesis unit 10 to stop the synthesis. The level correction unit 7 controls to increase the level of the sub audio data by +50 dB by the time 550 seconds, and the synthesizing unit 10 sends the level-changed sub audio data to the new audio data holding unit 6.
In this way, the new audio data holding unit 6 holds again the sub audio data whose level has been restored as in the beginning.

In this case, since the level of the sub audio data is modified to lower and synthesize the section to be synthesized with the main audio data and the levels before and after the section, the non-silent section of the main audio data is detected and synthesized. The main audio data can be overlaid without being damaged.

In the above description, the effective section detection processing unit 8 is notified at the change end position of the sub audio data (corresponding to T ₁ in FIG. 1A) and the main audio data from the main audio data holding unit 5 is notified. Although an example of starting data reading has been described, in this case, since there is a silent area in the main audio data at the beginning, it is possible to delay the output of the effective period signal, so expect that portion. The level correction section 7 may instruct the valid section detection processing section 8 to start the transmission of the main audio data slightly earlier than the change end position.

Next, an example in which such control is realized by a computer will be described with reference to FIG. Figure 3 (A)
Is a computer system, and CPU1
1, a memory 12, a display unit 13, a hard disk 14, a keyboard 15, a D / A conversion unit 16, a speaker 17, and the like.

The keyboard 15 is used for inputting data necessary for creating a correction information table as shown in FIG. 2B and other commands. The main audio data and the sub audio data are held in the hard disk 14 as digital data.

The valid level information and the correction information input from the keyboard 15 are respectively held in the memory 12 and decoded by the user input processing section 21. Therefore,
When the main audio data is synthesized with the sub audio data, in the CPU 11, the superposition processing unit 22
The correction information is decoded, the sub audio data and the main audio data are read from the audio data section 14-1, the superposition processing is performed as described above, and the new audio data section 14-1 holds them. Then, this can be read by the audio reproduction processing section 23 and reproduced by analog reproduction for confirmation.

In the above description, the valid section of the main audio data is defined as the section in which the audio data reaches a certain level. However, only the section that continues for a certain time or more may be defined as the valid section. it can.

[0030]

According to the present invention, the main audio data to be overlaid is automatically replaced with new audio data for which the sound of the main audio data is not drowned out by the sound of the sub audio data. This can be done efficiently as it can be synthesized.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a schematic explanatory diagram when the present invention is implemented by a computer.

[Explanation of symbols]

 1 synthesis processing unit 2 sub audio data holding unit 3 correction information holding unit 4 valid condition setting unit 5 main audio data holding unit 6 new audio data holding unit

Claims (3)

[Claims] 1. An audio data superimposing method for creating new audio data by superimposing a plurality of digitally converted audio data, wherein a time and a level at which the level of the sub audio data is changed are held as correction data. A method for superimposing audio data, characterized in that sub audio data is changed based on the modified data, and main audio data is superposed on the changed sub audio data. 2. The method for superimposing audio data according to claim 1, wherein the level of the main audio data is checked, and the main audio data is superposed on the sub audio data except for silent periods. 3. In a superimposing apparatus for a plurality of audio data converted into digital signals, a main audio data holding means (5) for holding main audio data and a sub audio data holding means (2) for holding sub audio data. A correction information holding means (3) for holding correction information, and a synthesizing processing means (1) for level-correcting the sub audio data and synthesizing the sub audio data with the main audio data.
A superimposing apparatus for audio data, characterized in that the synthesizing processing means (1) changes the level of the sub audio data based on the correction information and superimposes the main audio data on the sub audio data.