JPH10207493A - Device of individually estimating each level of announcement and bgm from signal in which announcement and bgm are mixed, measuring device for level difference of announcement and bgm which is constituted by using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable estimating each level of announcement and BGM by making a device such constitution that each level of estimated announcement and BGM in a signal in which announcement and BGM are mixed is obtained as an output signal. SOLUTION: Voice signals of left and right of two channel stereo are inputted to a sum/ difference signal synthesizing circuit 1. After a sum sign and a difference signal obtained by the sum/difference signal synthesizing circuit 1 are squared by square circuits 2-1, 2-2, and average by passing through long time averaging circuits 3-1, 3-2. Next, a long time averaging value of the difference signal is increased by 1/(1-r) times in a multiplying circuit 5 conforming to a correlation coefficient r4 of BGM, and this is made a long time average level. On the other hand, a value of (1+r)/2 times as much as a long time average level is subtracted from a signal to which a long time average value of the sum signal is halved by passing through a 1/2 multiplying circuit 6, and this is made a long time average level of announcement. A signal indicating a level difference between announcement and BGM is obtained from an output terminal of a difference signal synthesizing circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an announcement (audio) of a television or radio program and a B
A device for estimating announcement and BGM levels separately from each other in a mixed state, such as GM (usually music but sometimes sound effects), and a configuration using the device. The present invention relates to a device for measuring a level difference between an announcement and a BGM.

[0002]

2. Description of the Related Art Conventionally, BG of television and radio programs
In the adjustment of the M level, a stereo signal in which the announcement and the BGM are mixed (generally, the BGM is stereo) is actually heard by the ear and the BGM level is set to an appropriate value.

[0003]

However, in this method, the value set by the mixer (voice technician) is different,
Therefore, there is a drawback that the BGM level is too large or too small.

When producing a program, an announcement and a BG
Before mixing M, the level of the announcement and the level of BGM are measured with separate measuring instruments, for example, a VU meter.
Although there was a method for monitoring the level difference, there is no method for separately measuring the level of the announcement and the BGM with respect to the audio signal in which the announcement and the BGM are mixed. Only the BGM level could not be independently monitored with a measuring instrument or the like.

An object of the present invention is to solve the above-mentioned problems by providing an apparatus for separately estimating an announcement and a BGM level from a signal in which an announcement and a BGM are mixed, and an announcement configured using the apparatus. An object of the present invention is to provide an apparatus for measuring a BGM level difference.

[0006]

In order to achieve the above object, an apparatus for separately estimating an announcement and a BGM level from a signal in which an announcement and a BGM are mixed according to the present invention comprises a signal in which an announcement and a BGM are mixed. Is reproduced by the left and right speakers, the mixed signal is supplied, and a sum / difference signal combining circuit for combining the sum and difference signals of the left and right signals from the signal, and the output sum signal from the circuit First circuit means for squaring the received signal, averaging for a long time and halving the received signal, receiving an output difference signal from the sum / difference signal combining circuit, Squared, averaged over time and 1 / (1-r) times (r
Is the second circuit means for calculating the correlation coefficient between the BGM left and right signals, the third circuit means for multiplying the output signal of the second circuit means by (1 + r) / 2, and the first circuit means A first difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting an output signal of the third circuit means from an output signal, wherein an estimated announcement and a BGM of a signal obtained by mixing the announcement and the BGM are mixed. Each level is obtained as an output signal of the first difference signal synthesizing circuit and an output signal of the second circuit means.

Further, the apparatus according to the present invention for separately estimating the levels of the announcement and the BGM from the signal in which the announcement and the BGM are mixed is provided. The signal in which the announcement and the BGM are mixed is monaurally synthesized and reproduced by one speaker. In the case where the mixed signal is supplied, a sum / difference signal synthesizing circuit for synthesizing the sum and difference signals of the left and right signals from the signal, receiving the output sum signal from the circuit, Circuit means for squaring and averaging for a long time, receiving the difference signal output from the sum and difference signal combining circuit, squaring the received signal, averaging for a long time and (1
+ R) / (1-r) times (r is a correlation coefficient between left and right signals of BGM), and an output signal of the fifth circuit means from an output signal of the fourth circuit means. A second difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting the above-mentioned signal, wherein the level of each of the estimated announcement and the BGM in the signal obtained by mixing the announcement and the BGM is the second difference signal synthesizing circuit. And an output signal of the fifth circuit means.

[0008] In the apparatus for separately estimating, the correlation coefficient r is a value measured during a time period when the announcement does not exist.

[0009] In the apparatus for separately estimating the above, the correlation coefficient r is a fixed value of "1/3".

[0010] In the apparatus for separately estimating, the average of the long time is 1 to 20 seconds.

The apparatus for measuring a level difference between an announcement and a BGM according to the present invention, wherein the signal obtained by mixing the announcement and the BGM is reproduced by left and right speakers, respectively. A third difference signal combining circuit for combining a signal obtained by subtracting an output signal of the second circuit means from an output signal of the signal combining circuit, wherein a level difference between the announcement and the BGM is equal to the third difference signal; It is characterized in that it is obtained as an output signal of a synthesis circuit.

Further, the apparatus for measuring the level difference between the announcement and the BGM according to the present invention is characterized in that the signal in which the announcement and the BGM are mixed is synthesized in monaural and reproduced by one speaker. A fourth difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting the output signal of the fifth circuit means from the output signal of the second difference signal synthesizing circuit, wherein the level difference between the announcement and the BGM is equal to the second signal; 4 is obtained as an output signal of the difference signal combining circuit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments of the present invention with reference to the accompanying drawings. Before describing the configuration of the device according to the present invention, the basic principle on which the present invention is established will be described first.

At present, most television and radio programs are produced in stereo sound, but in the case of programs of the type in which BGM flows in the background, announcements are usually mixed in the left and right channels in the same phase and at the same level. The BGM is a stereo audio signal having different phases and levels in left and right channels. As will be described below, the present invention makes effective use of this property to separate the announcement and BGM levels from the already mixed signals and estimate them separately.

That is, the left and right audio signals constituting the two-channel stereo audio signal in which the announcement and the BGM are mixed are L (t) and R (t), respectively, the announcement signal is C (t) and the left and right BGMs are BGM. Each audio signal is L
_{Assuming that BGM} (t) and R _BGM (t), the announcement is usually mixed into the left and right channels at a ratio of 1 / √2.
The following equations (1) and (2) hold.

L (t) = L _BGM (t) + C (t) / {2} (1) R (t) = R _BGM (t) + C (t) / {2} (2)

Therefore, the sum signal S of the stereo audio signal
(T) and the difference signal D (t) are expressed by the following equations (3) and (4), respectively.

S (t) = L (t) + R (t) = L _BGM (t) + R _BGM (t) + √2 · C (t) ‥‥ (3) D (t) = L (t) −R (t) = L _BGM (t) −R _BGM (t) ‥‥ (4)

[0017] Here, L _BGM and (t) is R _BGM (t) is not a completely independent signals, and L _{BG M} (t) C
(T), and R _BGM (t) and C (t) are considered to be signals independent of each other, so that the long-term average values S ₀ ² and D ₀ ² of the square (power) of the sum signal and the difference signal are The following equations (5) and (6) are obtained, respectively.

S ₀ ² = L ₀ ² + R ₀ ² + 2rL ₀ R ₀ + 2C ₀ ² ‥‥ (5) D ₀ ² = L ₀ ² + R ₀ ² -2r L ₀ R ₀ ‥‥ (6)

In equations (5) and (6), L ₀ and R ₀ are the square roots of the long-term average of the square of the left and right signals of the BGM, respectively, and C ₀ is the long-term average of the square of the announcement. The square root and r are the correlation coefficients between the BGM left and right signals, and are defined by the following equations (7) to (12), respectively.

That is, in equations (5) and (6),

(Equation 4)

In the equations (7) to (12), the integration time T, that is, the averaging time, is preferably longer in principle, but a practical value is about 1 to 20 seconds. Also, B
The long-term average levels of the left and right audio signals of the GM are usually approximately equal. Therefore, the following equation (13) holds.

L ₀ = R ₀ １３ (13)

Using this relationship, the above equation (5)
Equation (6) can be rewritten into the following equations (14) and (15), respectively.

[6] _{^{S 0 2 = 2L 0 2 (}} 1 + r) + 2C 0 2 ‥‥ (14) D 0 2 = 2L 0 2 (1-r) ‥‥ (15)

According to the present invention, as described above, the announcement and BGM levels are separately estimated from the signal in which the announcement and BGM are mixed.
The long-term average level of the announcement and the long-term average level of the BGM are calculated based on the equations (4) and (15). The configuration differs between the case where the sound is reproduced and the case where the stereo sound is synthesized in monaural and reproduced by one speaker. Hereinafter, each case will be described.

(I) When stereo sound is reproduced by two speakers The left (L) channel signal is transmitted from the left speaker and the right (R) signal is output from the left speaker.
When the channel signal is reproduced by the right speaker, respectively, the long-term average level of the L channel is L ₀ ² + (C ₀ ²
/ 2), the long-term average level of the R channel is R ₀ ² + (C
₀ ^2/2) is because, long-term average level of long-term average level C ₀ ^2, BGM entire announcement L ₀ ² + R ₀ ² =
2L ₀ ² Therefore, from equations (14) and (15),

(7) Long-term average level of announcement = C ₀ ² = [S ₀ ² −D ₀ ² (1 + r) / (1-r)] / 2 (16) Long-term average level of BGM = 2L ₀ ² = D ₀ ² / (1−r) ‥‥ (17) Also, the level difference between announcement and BGM

C ₀ ² -2L ₀ ² = [S ₀ ² -D ₀ ² (3 + r) / (1-r)] / 2 (18)

(Ii) When stereo sound is synthesized in monaural and reproduced by one speaker When the (L + R) signal is reproduced by one speaker (monophonic reproduction), the long-term average level of the announcement is 2
The long-term average levels of C ₀ ² and BGM are 2L ₀ ² (1 + r). Therefore, from equations (14) and (15),

Equation 9] long-term average level announcements _{^{= 2C 0 2 = S 0 2}} -D 0 2 (1 + r) / (1-r) ‥‥ (19) long-term average level of ^{_{BGM = 2L 0 2 (1 +}} r) = D ₀ ² (1 + r) / (1-r)） (20) Also, the level difference between announcement and BGM

Equation 10] 2C ₀ becomes ^{_{2 -2L 0 2 (1 + r}} ) = S 0 2 -2D 0 2 (1 + r) / (1-r) ‥‥ (21).

From the above, mathematical expressions respectively representing the long-term average level of the announcement and the long-term average level of the BGM in the two cases are obtained, so that both left and right signals in which the announcement and the BGM are mixed are received, and The apparatus of the present invention can be realized by adopting a hardware configuration for performing the signal processing of the above equations (16) to (21) for signals.

FIG. 1 shows a case where the announcement and BGM levels are estimated separately for a case where stereo sound is reproduced by two speakers, and further, both signals (announcement and BG) are estimated.
FIG. 3 is a block diagram showing an embodiment of the apparatus of the present invention for measuring a level difference between M).

In FIG. 1, first, left and right audio signals (L) and (R) of a two-channel stereo are input to a sum / difference signal synthesizing circuit 1. Sum signal (L + R) obtained by the same circuit
And the difference signal (LR) are respectively applied to squaring circuits 2-1 and 2-2.
After squaring by −2, averaging is performed by passing through long-time averaging circuits 3-1 and 3-2 (time length is 1 to 20 seconds). Next, B
According to the GM correlation coefficient r4, the long-term average value of the difference signal (LR) is multiplied by 1 / (1-r) in the multiplying circuit 5 and is set as the BGM long-term average level. On the other hand, the sum signal (L
+ R) through the 1/2 multiplication circuit 6
From the signal set to 2, the long-term average level of BGM (1+
r) / 2 times to deduct the long term average level of the announcement.

Therefore, in FIG. 1, the signal representing the long-term average level of the BGM is converted into a subtraction input signal of the difference signal synthesizing circuit 8 through a multiplier (1 + r) / 2 according to the BGM correlation coefficient r4. Is supplied to the terminal, and a 1/2 multiplication circuit 6
Is supplied to the addition input terminal of the difference signal synthesizing circuit 8, and a signal representing the long-term average level of the announcement is obtained from the output terminal of the difference signal synthesizing circuit 8.

Further, in FIG. 1, the announcement and B
In order to measure the GM level difference, a difference signal synthesizing circuit 9 is provided in which a signal representing the long-term average level of the announcement is supplied to the addition input terminal and a signal representing the long-term average level of the BGM is supplied to the subtraction input terminal. From the output terminal of the difference signal synthesizing circuit 9, a signal representing the level difference between the announcement and the BGM is obtained.

FIG. 2 shows a device according to the present invention for estimating the announcement and BGM levels separately and measuring the level difference between both signals when stereo sound is synthesized in monaural and reproduced by one speaker. FIG. 10 is a block diagram showing another embodiment of the present invention. In FIG. 2, parts in which the same circuit elements as those in FIG. 1 are used are denoted by the same reference numerals.

In FIG. 2 as well, the left and right audio signals (L) and (R) of the two-channel stereo are sum-difference signal combining circuit 1
And a sum signal (L + R) and a difference signal (LR)
Is the same as that in FIG. 1 until the squaring and long-term averaging are performed via the squaring circuits 2-1 and 2-2 and the long-term averaging circuits 3-1 and 3-2, respectively. Next, according to the BGM correlation coefficient r4, the long-term average value of the difference signal (LR) is multiplied by (1 + r) / (1-r) in the multiplication circuit 10 to obtain the long-term average level of the BGM. On the other hand, the sum signal (L
The long-term average level of BGM is subtracted from the long-term average value of (+ R) to obtain the long-term average level of the announcement.

For this reason, in FIG. 2, a signal representing the long-term average level of the BGM is supplied to the subtraction input terminal of the difference signal synthesizing circuit 8, and the output signal of the long-time averaging circuit 3-1 is equal to the difference signal synthesizing circuit. The difference signal synthesizing circuit 8 is configured to supply a signal representing the long-term average level of the announcement from the output terminal of the difference signal synthesizing circuit 8.

In FIG. 2, the announcement and B
A signal representing the long-term average level of the GM is a difference signal synthesizing circuit 9.
Are supplied to the addition and subtraction input terminals, respectively, and a signal representing the level difference between the announcement and the BGM is obtained from the output terminal of the same circuit 9, as in the case of FIG.

In FIG. 1 and FIG. 2, a block denoted by reference numeral 4 as a BGM correlation coefficient r is a correlation coefficient r between the left and right signals of the BGM stereo signal (formally,
(12) is shown, and a measurement circuit for supplying the measurement result to the multiplication circuits 5, 7 and 10 is shown.
This is because it is difficult to measure the correlation coefficient of the BGM from the audio signal in which the announcement and the BGM are mixed during the time period in which the announcement is present. Measure the number of relationships.

The correlation coefficient r of BGM is usually 0 to 1
Since the range of / 2 is set, the correlation coefficient can be made variable. Also, for a normal stereo audio signal, r
= 1/3 fixed value.

[0036]

According to the present invention, it is possible not only to prevent the phenomenon that the announcement becomes difficult to hear due to the BGM level being too large, but also to make an announcement in a produced television or radio program. And whether the BGM level is appropriate.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing another embodiment of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sum and difference signal synthesis circuit 2-1 and 2-2 Square circuit 3-1 and 3-2 Long time averaging circuit 4 BGM correlation coefficient r 5,6,7,10 Multiplication circuit 8,9 Difference signal synthesis circuit

Claims (7)

[Claims] When a signal obtained by mixing an announcement and a BGM is reproduced by left and right speakers, the mixed signal is supplied, and a sum of a sum of the left and right signals and a signal of a difference are synthesized from the signal. A difference signal synthesizing circuit, first circuit means for receiving the output sum signal from the circuit, squaring the received signal, averaging the signal for a long time, and halving the signal;
The output difference signal from the sum / difference signal combining circuit is received, the received signal is squared, averaged for a long time, and 1 / (1-
r) (r is the correlation coefficient between the left and right signals of the BGM), and the output signal of the second circuit is (1+
r) / 2 circuit means, and a first difference signal combining circuit for combining a signal obtained by subtracting an output signal of the third circuit means from an output signal of the first circuit means. The estimated announcement and BGM levels in the mixed signal of the announcement and the BGM are obtained as the output signal of the first difference signal synthesizing circuit and the output signal of the second circuit means. An apparatus for separately estimating an announcement and a BGM level from a signal in which an announcement and a BGM are mixed. 2. In a case where a signal obtained by mixing an announcement and BGM is synthesized monaurally and reproduced by one speaker, the mixed signal is supplied, and a signal of a sum and a difference between left and right signals from the signal is supplied. Sum / difference signal synthesizing circuit, fourth circuit means for receiving the output sum signal from the circuit, squaring the received signal, and averaging for a long time, and output from the sum / difference signal synthesizing circuit Receive the difference signal, square the received signal, average over time and (1 + r) /
(1-r) times (r is a correlation coefficient between left and right signals of BGM)
And a second difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting the output signal of the fifth circuit means from the output signal of the fourth circuit means. The estimated announcement in the BGM mixed signal and the respective level of the BGM are obtained as an output signal of the second difference signal synthesizing circuit and an output signal of the fifth circuit means. A device for separately estimating the announcement and BGM levels from a signal in which the announcement and BGM are mixed. 3. The apparatus according to claim 1, wherein
Wherein said correlation coefficient r is a value measured during a time period when said announcement does not exist.
A device for separately estimating announcement and BGM levels from a signal mixed with M. 4. The device according to claim 1, wherein
The correlation coefficient r is a fixed value of “１ ／”, and an apparatus for estimating an announcement and a BGM level separately from a signal in which an announcement and a BGM are mixed. 5. The apparatus according to claim 1, wherein
The apparatus for estimating an announcement and a BGM level separately from a signal obtained by mixing an announcement and a BGM, wherein the average of the long time is 1 to 20 seconds. 6. The output of the second difference circuit from the output signal of the first difference signal synthesizing circuit according to claim 1, wherein a signal obtained by mixing an announcement and BGM is reproduced by left and right speakers. A third difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting a signal, wherein a level difference between the announcement and the BGM is obtained as an output signal of the third difference signal synthesizing circuit. A device that measures the difference between the announcement and the BGM level. 7. In a case where a signal in which an announcement and a BGM are mixed is monaurally synthesized and reproduced by one speaker, an output signal of the second difference signal synthesizing circuit according to claim 2 is used to output the fifth signal. A fourth difference signal synthesizing circuit for synthesizing a difference signal obtained by subtracting an output signal of the circuit means, wherein a level difference between the announcement and the BGM is obtained as an output signal of the fourth difference signal synthesizing circuit; An apparatus for measuring a level difference between an announcement and BGM.