JPS6244799A - Echo 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] [Technical Field] The present invention relates to a reverberation adding device that adds IAJ# to audio. [Prior Art] Conventionally, there has been a device for this purpose as shown in Fig. 3. Ta.

In the figure, 1.2ri plus JE! , 3 is BBD.

4. Delay path consisting of shift register, memory, etc.
5 is an attenuator.

Next, the operation will be explained.The input audio signal is added to the signal attenuated by the attenuator 4 in the adder 51, and is input to the delay path 3 and the attenuator 5. j! by delay path 3! The extended signal decreases;
[The signal attenuated by 45 is added by adder 2,
It is output and also input to the attenuator 4.

The transfer function H(jω) of this reverberation adding device is a patent that is characterized by the delay time of the delay path 3 being T1, the attenuation rate of Ra4 being g1, the attenuation rate of the attenuator 5, and its absolute value is IH(jω)1 =1・・・・・・・・・・・・・・・
・・・・・・・・・・・・(2) As a result, reverberant sound with flat frequency characteristics can be obtained.

The conventional reverberation adding device is configured as described above, so if it is configured using digital signal processing, tfj
, attenuation i4.5ri, processing is performed by a multiplier, but the faster the digital multiplication 'x4, the more expensive it is, and the fewer the number of times of multiplication processing, the better.

In addition, when this is configured using analog signal processing, attenuators 4.5 become resistive attenuators, but due to variations in the elements, the absolute values of the attenuation rates of attenuators 4 and 5 are made the same, and the frequency characteristics are flattened. In order to do so, there was a drawback that rJ4 adjustment was required.

Furthermore, this Azaki's remaining 1# device t can achieve even greater effects by cascade-connecting reverberation adding devices with flat frequency characteristics as shown in FIG. There is a drawback that the number of attenuators and delay paths is larger than the number of connection stages.

[Purpose] This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and has a flat frequency characteristic, a small number of multiplications, and no need for riS adjustment. It is an object of the present invention to provide a reverberation adding device in which the number of component circuits increases little due to cascade connection.

〔Example〕

Hereinafter, the embodiments of the present invention will be explained separately for the case where they are used alone and the case where they are used in cascade connection.

FIG. 1 shows an example in which the present invention is used alone, and in the figure, 1.2r! +$5.3.4 is BBD,
5 is an attenuator consisting of a resistive attenuator, a digital multiplier, etc.;
This is the phase length kW for inverting the phase of the 6ri signal.

FIG. 2 shows a case where a plurality of the present inventions are used in cascade connection. In the figure, 1 to 6 are adders, and 7 to 10 are BB.
Delay path consisting of D shift register, memory, etc., 11
13 are attenuators composed of resistive attenuators, digital multipliers, etc., and 14 to 16 are phase inverters that invert the phase of the signal.

Next, the operation of this invention will be explained.

First, when one embodiment of the present invention is used alone, the signal inputted in FIG. 1 is inputted to the adder 1 and the delay path 3. The signal input to adder 1 is summed with the delayed signal of delay path 4 and input to attenuation 55.

The signal input to the attenuator 5 is attenuated and input to the adder 2. -10,000, the signal input to the delay path 3 is delayed, phase inverted by the phase inverter 6, and input to the adder 2.

The signal added by adder 2 is J! ! delayed by delay line 4, the output of which is sent to adder 1 on the one hand;
The other side becomes the signal output.

The transfer function of this system H(jω)rJ:, If the delay time of the delay path 3.4 is T1 and the attenuation rate of the attenuator 5 is g, then the absolute value 1) I(jω)1 = 1
・・・・・・・・・－・・・(4) When the amplitude characteristic with respect to frequency is constant and the zeroth order is used, in the case where a plurality of implementation columns of this invention are used, in this case, 3-stage cascade The case when connected will be explained.

In FIG. 2, block A is provided with the output of adder 2 in FIG. 1 as a second output terminal.

In block B, the delay path 3 in FIG. 1 is omitted, the input of the phase inverter 6 is provided as a second input terminal, and the output of the force OJl device 2 in FIG. It is provided as an output terminal.

In the block Cri, the delay path 3 in FIG. 1 is omitted, and the input of the phase inverter 60 is provided as the first input terminal.

Block A is a block used at the beginning of a system using a plurality of embodiments of the present invention, block C is a block used at the end, and block B is connected between block A and block C. If the blocks are connected in cascade in more than three stages, this block B may be additionally connected.

The connection vc between each block is as follows: the first output 0UTI of the previous block is connected to the second input IN2 of the next block, and the output 0UT2 of #c2 of the previous block is connected to the first manual input INI of the next block. Connect to.

In FIG. 2, the transfer function H(jω) in the case of three-stage cascade connection is given by the delay time T of delay paths 7 to 10,
．． 12.13 attenuation rate t, respectively gx*g*・g3
Then, it becomes 1, and this absolute value tH(jω)l is = 1...
... axis (6), and the amplitude characteristics with respect to frequency are constant.

In the above embodiment, the phase is inverted after the delay, but the delay path may also be passed after the phase inversion.

Furthermore, in the above embodiment, the phase-inverted signal is m
However, the phase inverter may be omitted and a subtracter may be provided in place of the adder.

Furthermore, in the above embodiment, the delay path 10 in FIG.
Although a system output terminal is provided from the output side of the adder 6, the same effect can be obtained even if a thread output terminal is provided from the output side of the adder 6. Further, in FIG. 1, the output terminal of the system is provided from the output of the delay path 4, but the same effect can be achieved even if the output terminal of the thread is provided from the output of the adder 2.

〔effect〕

As described above, according to the present invention, when used alone as shown in FIG. ! It is possible to eliminate the need for adjusting the I-device. Also, when using multiple devices connected in cascade as shown in Figure 2,
If you connect N stage lt1 series, i! By simply increasing the A extension path by one system compared to the conventional system, the number of attenuators can be reduced to N/2.

In addition, the frequency characteristics of the present invention are f-flat, so natural! ! 4t# effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a reverberation adding device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a case where a plurality of reverberation adding devices according to an embodiment of the present invention are connected in cascade, and FIG. 3 is a block diagram showing a reverberation adding device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a conventional reverberation adding device. 1~6...-710! 5 7-10...Delay path 11-13...Attenuator

Claims (1)

[Claims] 1. A first adder, an attenuator, a second adder, and a first delay path are sequentially connected in cascade between a signal input terminal and an output terminal; The output of the delay path of is applied to the first adder, and the signal of the input terminal is further applied to the second adder via the second delay path and the phase inverter,
A reverberation adding device characterized in that a delay time T_1 of the delay path and a delay time T_2 of the second delay path are set to T_1=T_2. 2. The reverberation adding device according to claim 1, wherein the output terminal of the signal is the first output terminal, and the output of the second adder is the second output terminal.