JPS6051896A - Reverberation adder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that artificially adds reverberation to a music signal, etc.
)&I: Therefore, when generating reverberation sound, by expanding or contracting the series of parameters such as delay time and gain of each delay data as a whole, it is easy to set and change coefficient parameters, and custom-made reverberation can be achieved. It is designed to make setting operations easier.

When artificially adding reverberation to a music signal, etc., the most direct electronic method is to generate signals with various time delays from the direct sound, corresponding to the in-gurus response of the virtual room. This is a method of expressing it as a superposition of . This method uses a delay memory with t multi-taps, as shown in Figure 1 (al). -n, and the adder 3. In FIG. Here, X is the input signal
, for the time τ, the delayed signal, g, for each amplitude adjuster in
1 1 2-1, 2-2. '=, a gain of 2-n, that is, a coefficient assignment for each delayed signal x-. Figure 1 (
The echo time pattern of the device in al. is shown in Figure 1 (bl).

FIG. 2 shows the simulation results of primary and secondary reflected sounds in a real hall. For the first-order reflection, there was a reflection sound of ``l]'', and for the second-order reflection, there was a ``tofu'' reflection sound. If this is simulated artificially using the reverberation adding device shown in Figure 1, the delay time will be τ, ~τ.

35 types of settings are required. Further, 35 unique settings of gain data from g□ to gn are required. This is fine if the coefficients are fixed, but there is a demand for changing the reverberation characteristics depending on the situation. When assuming a large hall,
When assuming a narrow hall, the coefficient parameters for the 35 buildings must be set independently, such as when the reflection coefficient of the wall is considered thick and when it is considered small. You'll have to fix it, which is a total hassle and impractical.

This invention was made in view of the above-mentioned point VCd, and when setting or changing the parameters of each delay data, instead of setting or planning each delay data individually, it enlarges or reduces the entire series of parameters. The present invention aims to provide a residual i'1g addition device that makes it easy to set and change coefficient parameters and improves operability.

An embodiment of the present invention will be described below with reference to drawings with threads. Here, a case will be described in which the present invention is applied to setting and changing delay time parameters.

In general, when it comes to reverberation in a room, the more crowded the room, the longer the distance that sound waves travel, and the longer it takes for the reverberant sound to return. Therefore, if the rooms have approximately similar shapes but differ only in thickness, the echo time pattern will be the time-series sequence reduced by J) eight people, as shown in FIG. In other words, when creating the remaining V multiple using the delay memo IJ'1 in Figure 1 (al), the time interval for reading out each delayed signal is set to a predetermined time interval according to the room size, as shown in Figure 4. IfCT,C, it is enough to enlarge or reduce the ratio. Therefore, in this case, when setting each delay time, all you need to do is decide on the correlation between them, and then set the coefficients to be given to them according to the room size. This can be done simply by changing the magnitude of the delay time, making it easy to set and change the delay time.

FIG. 5 shows an embodiment of the present invention constructed based on the above principle.

In FIG. 5, )ξ parameter memory io+'io~n
It has n+1 addresses up to and stores each address parameter. Table 1 shows the parameters stored in each address.

Table 1 Note that in this table, τ. indicates one sampling period of input 4g. Therefore, it indicates the position of the sample corresponding to the delay time data (ie, how many previous samples). For example, τ. = 5 addresses ago.

Parameters are written into the ξ parameter memory 10 by the ξ parameter controller 12 based on the operation of the keyboard 1.

Switch Z5 is for setting the room size. R
OM 26 sets the coefficient R according to the room size to 1. According to the selection position of switch Z5, the coefficient R
For example, output the following value.

The room size coefficient R read from the second table ROM 26 is enlarged or reduced in time series according to the room size coefficient RK as shown in FIG. 6 (in this case, the gain data g1
e g2 e...+gn series remains unchanged).

The data memory (delay memory) 13 is composed of a RAM, in which digital inputs in the form of A/D conversion of analog input signals are sequentially written, and data at corresponding addresses are read out to create delay data. .

The counter 14 indicates an address (hereinafter referred to as a visual address) m in the data memory 13 at which writing is to be performed, and is incremented every sample period of the input signal.

The counter 15 specifies the read address of the parameter memory 10, and counts up from 0 to n within one sample period of the input signal to output each parameter of delay time data "a" and gain data g.

The multiplexer 16 is used to switch the address command to the caliber meter memory (address command to add JK) to the write address of the rammer tachocitrol 12 or the ml output address from the counter 5.

The subtracter 17 outputs a value obtained by subtracting the current address of the counter 471 and the delay time data RXI from the multiplier n as an adreno command to the data memory 3. Data memory 3 is nozzle meter memory 0.
When the read address is O (that is, when both the delay time data and the gain data are read as 0 as shown in Table 1), the mode is switched to the write mode, so at this time the output of the subtracter 17 ( That is, the current address m itself from the counter 4) is added to the data memory 3 as an address command. In addition, the data memory 3 is
When the bladder output address of parameter memory 0 is other than O, the mode is switched to d output mode, so this
7 (that is, it is added to the data memory 13 as a delay time data address command for the current address mK).

The multiplier 18 provides the delay signal Xi read from the data memo I713 with the corresponding gain data gi extracted from the parameter memory.

The accumulator 19 accumulates the delayed signals g, .
This is to create a number. The reverberation signal created by the accumulator 19 is then D/A converted and output. The R, AND circuit 21 is used to cut off the accumulated data up to that point and reset the accumulated value to 0 using the signal 03 every time the reverberation (T) is created.

The timing controller 22 is for creating each timing signal Cl-C5 for operating each of the above-mentioned circuits.

Next, the operation of the apparatus shown in FIG. 5 will be explained.

(1) Nozzle meter settings, room size settings Delay time data τ
8 Set each parameter of gain data gl. Parameter settings are established 14 by the parameter controller 12. That is, in accordance with the operation of the keyboard 130), the parameter memo 1110 is switched to the convolution mode, the multiplexer 16 is switched to the setting mode, and parameters are set. Also, switch 5Il'il: Therefore, the room size is set.

(4) After setting the reverberation signal creation parameters,
is switched to the reverberation mode, the multiplexer 16 is switched to the counter 15 side, and an input signal is supplied to the data memory 13 to create a reverberant key signal.

To create a reverberant signal, 1 sampling period of input 1g is 1
As a unit, write the input No. 1 to the data memo January 3 on the instep. ■ Read the delayed information τ0 No. XL corresponding to the data RX4 at each delay set from the data memory 13. Adding gain gH to each read delay signal X! Each step of (convolution operation) is performed sequentially to create the remaining # signal. Each step will be explained with reference to the time chart in FIG.

■Clock CI of input signal to data memo January 3
At the rising edge of , the clock c4 becomes low level and the counter 15 is cleared. Therefore, parameter memo 11
10, address 0 is set as 4, and rOJ is read out for both delay time data and gain data. Then, when the next clock c5 rises, the clock C2 also rises, and the data memory 13 enters the write state. This time, parameter memo 1
The delay time data from the moon () is rOJ as mentioned above, and the output of the calculator 27 is also 0,
The output of g1.7 becomes the output of the counter 14 itself, that is, the dust address m, and the data memo IJ131C! mVc input number is written.

■Reading the delayed signal from the data memory 13 When writing to the data memory 1:3 is completed, the data memory 13
is in read mode. The clock c5 rises a total of n+1 times, including once for writing and n times for reading within l sampling period. The counter 15 uses this clock C.
5 is counted, and the count value f is added to the A parameter memory and read out at the time of delay. For example, when the count value of counter 15 is "1", the nogurameter memo January 0
The delay time counter 17 reads out the address value from the parameter memory 10 and subtracts it from the count value of the counter 14.

This results in subtraction. As a result, the subtracter 17 outputs the count value of the counter 14, \, that is, the current address m?
: As a reference, the address data that is a distance before the delay time data RX'/ by the distance indicated by O is output, and the delay signal XI stored at the corresponding address is read out from the data memory 13.

3) Assignment of gain data t< The delayed signal X read out from the data memory 3 is assigned each corresponding gain data g1 read out from the parameter memo 1/0 in the multiplier 18.

■In the accumulation accumulator 19, when the counter 50 count value is 1, the accumulated value in the previous sampling period (m-1) is reset by the clock C3, and the accumulated value in the current sampling period ((b)) is reset according to the clock C5. Intersection data gl・X1+jZ2・X2 + ”' l gll・X
Accumulate n to create 1.2g1·Xi. This accumulated data is then D/A converted and output as a -1 reverberation signal.

In the above embodiment, the room size coefficient R is assigned using the multiplier n, but instead of this, a shifter is used to calculate the delay time data for each bin l? By sinting, we can obtain a result similar to multiplying. Room size coefficient R and corresponding delay time data Kei's Schiff F
The relationship between ik is shown in the table below.

Table 3 If the shifter is used in this way, the expensive multiplier n becomes unnecessary, so it can be purchased at a low price.

In addition, in the above embodiment, the case where the delay time data series is set and changed according to the room size was explained.
It can also be applied when setting or changing according to factors other than room size that determine the remaining number of custom orders. Furthermore, the present invention can be applied to setting and changing 5 rammeters of data series related to gain data gi and other delay data.

As explained above, according to the present invention, the data series of delayed data is set and changed by expanding or contracting the entire data series proportionally, so there is no need to set or change each individual delayed data. , c <, which facilitates the setting operation.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram showing a conventional reverberation adding device;
Figure 1 (bl is a line diagram showing the echo time nomi turn by the reverberation addition device in Figure 1 (al), Figure 2 is an echo time pattern showing the simulation results of primary and secondary reflected sound in a real hall. Figure 3 is a diagram showing how the echo time pattern expands and contracts proportionally depending on the room size. FIG. 5 is a block diagram showing an embodiment of the present invention, and FIG. 6 is a diagram showing the setting state of the delay time. FIG.
The time series of data output from is the room size coefficient R
FIG. 7 is a time chart showing the operation of the device shown in FIG. 5. 1, 5, 13...Data memory (delay memory), 3.7.9...Adder (just a crowd calculator), Section...2 inches for room size setting, 2G...Room size Coefficient memory ROM0 No. (0) Ichiriki) 2↑ J-connection 1 Figure 2 Figure 6! Keyaki education! kB emotion

Claims (1)

[Claims] a delay memory that stores input signal data at a constant sampling period; a reverberation characteristic instruction unit that specifies a reverberation characteristic; and a calculation unit that performs a convolution operation based on a plurality of delay data stored in the delay memory; expanding the series of parameters that constitute the delay data used for the convolution calculation as a whole according to instructions from the open station reverberation characteristic instruction unit;
A reverberation adding device comprising a control section for reducing the reverberation.