JPH0522239A - Effect sound addition discriminating device - Google Patents

Abstract

PURPOSE:To control the degree of addition of an effect sound depending on the kind of an input signal by discriminating accurately what kind of a signal the input signal is (such as music signal or announcement signal). CONSTITUTION:A silence frequency discrimination means 16 detects the member of times of silence for a prescribed block to discriminate whether or not the input signal is an announcement signal. Furthermore, a level difference discrimination means 17 discriminates whether the input signal is the announcement signal or a music signal based on a level difference of an LR signal. An effect sound volume 19 is controlled in response to the result of discrimination to decide an output level of the effect sound generated by an effect sound generating means 18 and the effect sound is added to the input signal and the result is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect addition discriminating apparatus for discriminating a stereo input sound signal as music or an announcement and determining a sound effect addition rate of reflected waves, reverberation and the like.

[0002]

2. Description of the Related Art In recent years, with the widespread use of acoustic devices having a function of discriminating a stereo input acoustic signal from music or an announcement and adding a sound effect such as a reflected wave or reverberation, the announcement is unnatural. There is an increasing demand for a sound effect addition / discrimination device as a system for controlling sound effects. The conventional sound effect addition discriminating apparatus will be described below.

FIG. 5 is a block diagram showing the structure of a conventional effect sound addition discrimination apparatus. In FIG. 5, reference numerals 1 and 2 respectively denote an L signal input terminal for digital sound, an R signal input terminal, and 3 denotes an input signal addition processing unit for the L signal and the R signal.
Reference numeral 4 is a level difference discriminating means for discriminating between music and announcement based on the level difference between the L signal and the R signal, and 5 is a sound effect producing means for producing a reflected wave or reverberation. 6 is a sound effect volume for setting a sound effect level, and 7 and 8 are direct sound volumes for setting a direct sound level. Reference numeral 9 is an output signal addition processing unit for the sound effect and the L signal, and 10 is an output signal addition processing unit for the sound effect and the R signal.

The operation of the sound effect addition / discrimination device constructed as described above will be described below. First, L
L signal from signal input terminal 1 and R signal from R signal input terminal 2
The signal is input to the level difference determination means 4. The processing operation of the level difference determining means 4 will be described with reference to the flowchart of FIG. First, it is determined whether the input signal is voiced or silent (step 1). Here, if the absolute value of the L + R signal is greater than or equal to a certain value, it is determined that there is sound, and if it is less than a certain value, it is determined that there is no sound. If it is determined that there is sound, it is determined whether the input signal is music (step 2). Here, if the difference between the input L signal and R signal is greater than a certain value, it is determined as music,
If it is less than a certain value, it is determined that it is not music. If it is determined that the input signal is not music, it is determined whether the input signal is an announcement. If the difference between the input L signal and the R signal is less than a certain value, it is determined to be an announcement, and if it is more than a certain value, it is neither a music nor an announcement, and the processing of the level difference determination means 4 is terminated as an undeterminable signal.

When it is judged as music in step 2, the sound effect volume 6 is added (step 3) and the direct sound volumes 7 and 8 are subtracted (step 4), and the level difference judging means 4 is added.
Ends the process. When it is determined to be an announcement in step 5, the sound effect volume 6 is subtracted (step 6), the direct sound volumes 7 and 8 are added (step 7), and the processing of the level difference determination means 4 is ended.

Further, an L signal input terminal 1 and an R signal input terminal 2
The LR signals from and are added by the input signal addition processing unit 3 and input to the sound effect generation means 5. Here, the level of the sound effect that has generated the reflected wave and the reverberation is determined by the sound effect volume 6 set by the level difference determination means 4, and the level is determined by the direct sound volume 7 set by the level difference determination means 4. The L signal is added by the output signal adder 9 and output from the L signal output terminal 11.
Similarly, the level of the R signal is determined by the direct sound volume 8, and the effect sound whose level is set by the effect sound volume 6 is added by the output signal adder 10 and output from the R signal output terminal 12.

As described above, even in the above-described conventional sound effect addition / discrimination device, it is discriminated whether music or announcement is made from the level difference of the L signal diagram R signal, the sound effect is increased in the music signal, and the announcement signal is made. The sound effect can be reduced.

[0008]

However, in the above-described conventional sound effect addition / discrimination device, since it is determined whether music or an announcement is made only by the level difference between the L signal and the R signal, a signal of music + announcement, that is, , For news or commercials where music is being played, the place where it should be judged as an announcement is judged as music and a sound effect is added, or for the same reason, the L signal and the R signal are added like in a dialogue. Even when used independently, sometimes the place where it should be identified as an announcement was identified as music. In addition, even if the input LR signal originally has a level difference, the announcement may be discriminated as music. Further, since the output level of the direct sound is also changed according to the determination result, there is a problem that the overall level fluctuates unnaturally.

The present invention solves the above-mentioned problems of the prior art, namely, a music + announcement signal, an announcement signal using the L signal and the R signal independently, and an announcement signal having a large level difference between the L signal and the R signal. It is an object of the present invention to provide an excellent effect sound addition discriminating apparatus capable of accurately discriminating an announcement.

[0010]

In order to achieve the above object, the present invention inputs a digital acoustic signal, detects the number of silences based on the absolute value of the L + R signal level, and detects the silence count in a certain interval. Based on the numerical value, the input signal is a music based on the level difference between the L signal and the R signal, and a silence number determination means for determining whether the input signal is an announcement signal or a silence signal. A level difference discriminating means for discriminating between a signal and an announcement signal, a sound effect producing means for producing a sound effect to be added to the input signal, a sound effect volume for setting a ratio of sound effect addition according to the result of the judgment, and an effect. It is provided with a sound effect addition signal output unit for adding and outputting a sound and an input signal.

[0011]

Therefore, according to the present invention, even when an announcement signal having a large level difference between LR signals (news with music flowing, commercials, dialogues, etc.) is input, the announcement signal is reproduced by the silence number judging means. Since there are more silence states than signals, the number of silences in a certain section is detected to determine whether or not there is an announcement, and the signal that is determined not to be an announcement is the L signal and the R signal by the level difference determination means. By discriminating between the announcement and the music based on the level difference of, it is possible to more strictly discriminate between the music and the announcement.

[0012]

FIG. 1 is a diagram showing a first embodiment of the present invention. In FIG. 1, reference numerals 13 and 14 denote an L signal input terminal and an R signal input terminal for digital sound, respectively. Reference numeral 15 is an input signal addition processing unit for L and R signals, and 16 is L + R.
A silence number determination means for detecting the number of silences from the absolute value of the signal level, and determining whether the signal is an announcement signal or a silence signal based on the number of silences in a certain section.
Is a level difference discriminating means for discriminating music or announcement from the level difference between the L signal and the R signal, and 18 is a sound effect producing means for producing a reflected wave or reverberation. 19 is a sound effect volume for setting the sound effect level, 20 is a sound effect volume 19
An output signal addition processing unit for the sound effect and the L signal whose level has been set in step 21 is an output signal addition processing unit for the sound effect and the R signal whose level has been set by the sound effect volume 19. 22, 23
Are L signal output terminals and R signal output terminals for digital sound, respectively.

Next, the operation of this embodiment will be described. First, the L signal is input from the L signal input terminal 13 and the R signal is input from the R signal input terminal 14 to the silence count determining means 16. The operation of the silence count determination means 16 will be described with reference to the flowchart shown in FIG. First, it is determined whether the input signal is voiced or silent (step 1). Here, if the absolute value of the L + R signal is greater than or equal to a certain value, it is determined that there is sound, and the process proceeds to step 3. Also, if it is less than a certain value, it is judged as silence,
The number of silences is updated (step 2). Next, it is determined whether or not the silence detection in a certain fixed section is completed (step 3). If it is finished, the announcement is discriminated (step 4), but if it is not finished, the silence number discrimination means 16
Ends the process. In step 4, if the number of silences in a certain section is less than a certain value, the process of the level difference determination means 17 is executed, and if it is more than a certain value, the silence section determination in step 5 is performed. In step 5, if the number of silences is a certain value or more, it is determined that there is no input, and the process proceeds to step 11.
If it is less than a certain value, it is determined that the input is an announcement, and the sound effect volume 19 is subtracted (step 6). In step 11, the silence count is reset, and the processing of the silence count determination means 16 ends.

The processing of the level difference discriminating means 17 will be described with reference to the flowchart of FIG. First, if the difference between the input L signal and R signal is greater than a certain value, it is determined to be music, and if it is less than a certain value, it is determined that it is not music and the process proceeds to step 9 (step 7). When it is determined that it is not music, it is determined whether the input signal is an announcement.
If the difference between the input L signal and R signal is less than a certain value, it is judged as an announcement and the process proceeds to step 10. If the value is equal to or more than a certain value, the level difference judging means 17 is terminated as an undecidable signal which is neither music nor an announcement, and the process moves to FIG.

When it is determined that the input signal is music, the sound effect volume 19 is added, and when it is determined that the input signal is an announcement, the sound effect volume 19 is subtracted,
The processing of the level difference discriminating means 17 is ended, and the process moves to FIG.

The LR signals from the L signal input terminal 13 and the R signal input terminal 14 are added by the input signal addition processing section 15 and input to the sound effect generating means 18. Here, the sound effect that has generated the reflected wave and the reverberation is the silent frequency determination unit 1
6 and the sound effect volume 19 set by the level difference determining means 17, the level is determined, the input L signal and the output signal adder 20 add the levels, and the output is output from the L signal output terminal 22. Similarly, the R signal is also added to the effect sound whose level is set by the effect sound volume 19 by the output signal adder 21 and output from the R signal output terminal 23.

As described above, according to the first embodiment, from the level difference between the L signal and the R signal, before the level difference discriminating means for discriminating between the music signal and the announcement signal, from the absolute value of the input signal level. An announcement signal having a level difference in the LR signal is provided by providing a silence number determination means for detecting the number of silences and determining whether it is a music signal, an announcement signal, or a silence section from the silence number value in a certain section. Also, it is possible to make an appropriate determination. further,
Since the determination result is reflected only in the sound effect, it is possible to control the presence / absence of the sound effect addition without feeling the overall level variation.

FIG. 4 is a flow chart showing the operation of the second embodiment of the present invention. The second embodiment is different from the first embodiment in the operation of the silence number judging means 16, and since the other constitutional requirements are the same as those of the first embodiment, detailed description thereof will be omitted. .

First, it is determined whether the input L signal is voiced or silent. If the absolute value of the L signal is greater than or equal to a certain value, it is determined that there is sound. If it is less than a certain value, it is determined that there is no sound, and the number of silent times is updated (step 2). Next, it is determined whether the input R signal is voiced or silent. If the absolute value of the R signal is greater than or equal to a certain value, it is determined that there is sound. If it is less than a certain value, it is determined that there is no sound, and the number of silent times is updated (step 4). Next, it is determined whether or not the silence detection in a certain fixed section is completed (step 5). If it has ended, it is judged whether it is an announcement (step 6), and if it has not ended, the silence number judging means 16
Ends the process. In step 6, if the number of silences in a certain section is less than a certain value, the process of the level difference determining means 17 is executed, and if it is more than a certain value, the silence section determination is performed (step 7). In step 7, if the silence count is equal to or greater than a certain value, it is determined that there is no input state, and the processing of the silence count determination processing means 16 ends. If it is less than a certain value, it is determined that the input is an announcement, the sound effect volume is subtracted, and the process proceeds to step 9. In step 9, the silence count is reset, and the processing of the silence count determination processing means 16 ends.

As described above, according to the second embodiment, by providing the silence number detecting means for separately detecting the number of silences for the L signal and the R signal, the L signal and R signal diagrams are independently obtained. There is an effect that it is possible to make an appropriate determination with respect to the used announcement signal such as a dialogue.

In FIG. 1, the input signal is input to the sound effect generation means 18 as the L + R signal by the input signal addition processing unit 15. However, the L signal and the R signal are input without passing through the input signal addition processing unit 15. Alternatively, the sound effects may be separately input to the sound effect generation unit 18, and the sound effects may be added to the L and R separately.

[0022]

As is apparent from the above-described embodiment, the present invention is provided with a silence number judging means for detecting the number of silent signals in a certain section and discriminating whether or not an announcement is made based on the number. Enables announcement signals with different LR signal levels (news with music, commercials, etc.)
Or an announcement signal that uses the LR signal independently (interview,
Even for commercials, etc.), an appropriate announcement can be discriminated, and since the result of the brother discrimination is reflected only in the sound effect, it is possible to determine whether or not the sound effect is added without unnaturally changing the overall level. It has the effect of being controllable.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a sound effect addition / discrimination device according to a first embodiment of the present invention.

FIG. 2 is a flow chart showing a processing operation of a silence count judging means in the first embodiment.

FIG. 3 is a flowchart showing the processing operation of the level difference determination means in the first embodiment.

FIG. 4 is a flowchart showing an operation in the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional effect sound addition discrimination device.

FIG. 6 is a flowchart showing the operation of a conventional example.

[Explanation of symbols]

15 Input signal addition processing unit 16 Silence frequency determination means 17 Level difference determination means 18 Sound effect generating means 19 sound effect volume 20, 21 Output signal addition processing unit

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Claims (2)

[Claims] 1. A digital audio signal is input, the number of silences is detected based on the absolute value of the L + R signal levels, and whether or not the input signal is an announcement signal based on the value of the number of silences in a certain interval. Or a silence signal, and a level difference determining means for determining whether the input signal is a music signal or an announcement signal based on the level difference between the L signal and the R signal, and the input. A sound effect generating means for generating a sound effect to be added to the signal, a sound effect volume for setting a ratio of the sound effect addition according to the result of the discrimination, and a sound effect addition signal for adding and outputting the sound effect and the input signal. An effect sound addition discriminating apparatus having an output section. 2. The sound effect addition discriminating apparatus according to claim 1, wherein the number of silences is detected separately for the L signal and the R signal of the input signal.