JPH053000B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a device that artificially adds reverberation to a music signal, etc., and is capable of generating a reverberant signal by superimposing (convolution operation) a signal obtained by delaying an input signal and a parameter series for generating reverberant sound. , by expanding or reducing the time interval of the reverberation sound generation parameter series as a whole, it is possible to easily set and change the reverberation sound generation parameters, thereby facilitating the reverberation characteristic setting operation. It is. When artificially adding reverberation to music signals, etc., the most direct electronic method is to express it as a superposition of signals with various time delays from the direct sound, corresponding to the impulse response of a virtual room. It's a method. As shown in FIG. 1a, this method uses a delay memory 1 having a multi-tap, and sends a delayed signal from each tap to an amplitude adjuster 2-1.
2-2, . . . , 2-n by an adder 3. In the apparatus shown in FIG. 1a, a reverberant signal x out= _o 〓 ⁱ⁼¹ x _i ·g _i (1) is obtained as the output x out. where x _i is the input signal
A delayed signal _{g i} which is obtained by delaying x _io by a time τ _i is the gain of each amplitude adjuster 2-1, 2-2, . The echo time pattern of the device of FIG. 1a is shown in FIG. 1b. FIG. 2 shows the simulation results of primary and secondary reflected sounds in a real hall. 1
There were 11 second-order reflections and 24 second-order reflections. If this is artificially simulated using the reverberation adding device shown in FIG. 1, the delay time data will require 35 different settings from τ ₁ to _{τ o} . Furthermore, 35 types of gain data settings from g ₁ to _go are required.
This is fine if the reverberation characteristics are fixed, but
There is a demand for changing reverberation characteristics depending on the situation. For example, when trying to obtain reverberation characteristics for various assumed hall sizes, it is necessary to independently set 35 types of reverberation sound generation parameters to accommodate each of these. This is completely ridiculous and unrealistic. This invention has been made in view of the above points, and when setting or changing reverberant sound generation parameters, instead of setting or changing them individually for each reverberation characteristic data, the time interval of the parameter series is changed as a whole. It is an object of the present invention to provide a reverberation adding device that facilitates the setting and changing of reverberant sound generation parameters by enlarging and reducing targets and setting and changing them, thereby improving operability. An embodiment of the present invention will be described below with reference to the accompanying drawings. Generally speaking, the larger 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 substantially similar shapes and differ only in size, the echo time pattern will be an enlarged or reduced time series, as shown in FIG. In other words, when creating a reverberation signal using the delay memory 1 in Figure 1a, the time interval for reading out each delayed signal is expanded or decreased at a predetermined rate depending on the room size, as shown in Figure 4. It will be a good thing if you do it. Therefore, in such a case, all you have to do is set each delay time data by determining the correlation between them, and then all you have to do is change the size of the coefficients given to them according to the room size. Setting the delay time data that constitutes the parameter series for reverberation sound generation,
Changes become easier. FIG. 5 shows an embodiment of the present invention constructed based on the above principle. In FIG. 5, the parameter memory 10 is 0 to
It has n+1 addresses up to n, and each parameter of delay time data τ _i /τ ₀ and gain data g _i is stored in each address. Table 1 shows the parameters stored at each address.

【table】

Claims (1)

[Claims] 1. A delay memory that sequentially stores input signals sampled at a constant sampling period; a parameter memory that stores a parameter series for generating reverberant sound consisting of delay time data and gain data; and the sampling period. parameter memory reading means for repeatedly reading out the reverberation sound generation parameter series from the parameter memory for each reverberation sound generation parameter series; coefficient setting means for variably setting a common coefficient by which the delay time data of the reverberation sound generation parameter series is multiplied; a coefficient multiplier for multiplying each delay time data read from the parameter memory by the set common coefficient; and a coefficient multiplier for multiplying each delay time data read from the parameter memory by the set common coefficient; delay memory reading means for reading from the delay memory, and multiplying the input signal read from the delay memory by the gain data corresponding to each of the reverberation sound generation parameter series read from the parameter memory, and multiplying the input signal read from the delay memory at each sampling period. A reverberation adding device comprising a multiplication and accumulation means for accumulating these multiplied values and outputting the result as a reverberation signal.