JPH0511199U - Chorus effect addition device - Google Patents

Abstract

(57) [Abstract] [Purpose] When adding a chorus effect to an input signal, it is possible to prevent an unnatural level change from being added to the input signal. [Configuration] It is possible to delay the input signal and change the delay time. The delay time in the possible delay means 14 can be changed by the delay means 16, 18
Fluctuate by. A low-pass filter (20) extracts a low-pass component of an intermediate output signal having a short delay time extracted from the middle of the delay means (14). Another intermediate output signal having a delay time longer than that of the intermediate output signal supplied to the low-pass filter 20 is taken out from the delay means 14, and its intermediate-pass component is extracted by the band-pass filter 24. The high-pass component of the final output of the delay means having the longest delay time is extracted by the high-pass filter 26. The output signals of these filters 20, 24 and 26 are mixed with the input signal by the mixer 22 and output.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a chorus effect that adds a chorus effect to an input signal by using a delay means. Regarding the addition device.

[0002]

[Prior art]

  Conventionally, as a device for adding the above chorus effect, for example, a device as shown in FIG. It is known that the input signal of the input terminal 2, for example a voice signal, is delayed by BBD or the like. It is supplied to the element 4. This delay element 4 has the following structure when an input signal passes through it. The delay time corresponding to the cycle of the clock signal from the clock generation circuit 6 can be obtained. The cycle of this clock signal is changed by the modulation circuit 8. Therefore, The delay time of the delay signal output from the delay element 4 is not constant but is changing. Such a delayed signal and the input signal are mixed by the mixer 10 and output from the output terminal 12. Therefore, the signal obtained at the output terminal 12 is the input signal and the delayed signal. It is a mixture of the No. and the No. and the chorus effect is obtained.

[0003]

[Problems to be solved by the device]

  However, with the chorus effect adding device as described above, a good chorus effect is obtained. The delay time, the modulation frequency that modulates the delay time and the modulation depth When the level is set to an appropriate state, the modulation is too deep in the low range, and in addition to the chorus effect, An unnatural level change such as a tremolo effect, which is different from howling, is also added. There is a case.

[0004]   The present invention solves the above problems and provides a natural chorus effect. An object is to provide a fruit adding device.

[0005]

[Means for Solving the Problems]

  In order to achieve the above object, the first device of the present invention delays an input signal and delays the delay time. And the basic delay time in this delay means. The low frequency component of the intermediate output signal extracted from the middle of the varying means and the delay means At least the above low-pass filter from the low-pass filter to be passed and the final output signal of the delay means. Filters that pass signals other than band components, and output signals and inputs of these filters Mixing means for mixing with the signal.

[0006]   In the second invention, one intermediate output signal is taken out from the middle of the delay means. Instead, extract multiple intermediate output signals with different delay times and Supply to the split filter. The band-splitting filter separates each intermediate output signal from The constant frequency component is extracted, but the extraction is performed with the long delay time of each intermediate output signal. The frequency components to be extracted become lower as going from the shorter one to the shorter one. Be seen. In addition, the final output signal of the delay means is the frequency of each frequency extracted by the band division filter. It is supplied to a filter that passes frequency components other than wave number components. These filters The output signal of is mixed with the input signal in the mixing means and output.

[0007]

[Action]

  According to the first invention, the intermediate output whose delay time is shorter than the final output signal of the delay means. The low-pass component is extracted from the signal by a low-pass filter, and this is supplied to the mixing means. Therefore, the unnatural level change added to the low frequency component of the input signal is very small. Is. Similarly, in the second device as well, a plurality of delay units having different delay times are provided. Of the intermediate output signal of Since a short one is output, an unnatural level added to the low frequency component Le changes are minimal.

[0008]

【Example】

  FIG. 1 shows a first embodiment. This embodiment applies the present invention to a chorus effect adding device. The input audio signal of the input terminal 12 is supplied to the delay unit 14. The delay means 14 includes, for example, three delay elements connected in series, for example, the BBD 14 It consists of a, 14b and 14c. These delay elements 14a, 14b, 14c are As the signal passes through the inside, the delay time is gradually increased by the reference delay time. This reference delay time depends on the clock signal generated by the clock generation circuit 16. It is determined by the period of the issue. However, the cycle of this clock signal is Has been changed by. The clock signal generation circuit 16 and the modulation circuit 1 Since the configuration of 8 is publicly known, further description is omitted.

[0009]   Since the delay elements 14a, 14b, and 14c have the above-described configuration, the delay element 1 The delay time of the output signal of 4a is the shortest, and the delay time of the output signal of 14c is the longest. The delay time of 14b is the middle delay of the delay times of the output signals of 14a and 14c. It will be postponed. The output signal of the delay element 14a, that is, the output signal with the shortest delay time is , Low-pass filter 20 is supplied to the low-pass filter 20 and the low-frequency component of each frequency component of its output signal is generated. Only the minutes are passed and supplied to the mixer 22.

[0010]   The output signal of the delay element 14b is supplied to the bandpass filter 24, Only the mid-range component of each frequency component of the output signal is passed and supplied to the mixer 22. Be paid. Further, the output signal of the delay element 14c is supplied to the high pass filter 26. Then, only the high frequency component of each frequency component of the output signal is passed, Is supplied to the service 22. The input signal is also supplied to the mixer 22 from the input terminal 12. There is. Therefore, the output of the mixer 22 is the input signal and the delay element 14 having a short delay time. a low-frequency component of the output signal of a and the mid-range of the output signal of the delay element 14b whose delay time is intermediate The component and the high frequency component of the output signal of the delay element 14c having a long delay time are mixed. Will be

[0011]   In the chorus effect adding device thus configured, the low frequency component of the input signal is delayed. The input signal is supplied to the mixer 22 with a slight delay due to the delay element 14a. By being mixed with the signal, a chorus effect is added to the input signal. But, Since the delay time of the low frequency component is very small, the modulation applied to the input signal is very shallow. And the resulting level changes are extremely small. Therefore, selflessness However, the change in the level of the musical sound is not noticeable. In addition, the input signal is greatly delayed Mixing the output signal of the delay means 14c with the input signal in the mixer 22 Therefore, a level change is added to the signal, but since it is a high frequency component, it is almost audible. But not recognized. Further, if the delay time of the mid-range component is also increased, the mixer 22 When mixed with the input signal, a level change is added, though not as much as low frequency components. Then, the mid-range component is output from the output of the delay element 14b whose delay time is shorter than that of the delay element 14c. It is taken out by the band pass filter 24 and supplied to the mixer 22. I try not to notice the level change.

[0012]   In the above embodiment, the delay means 14 is composed of three delay elements 14a, 14b and 14c. Thus, the number of delay elements can be increased or decreased according to the situation. Well In addition, in the above-described embodiment, the bandpass filter 24 delays the delay time that is intermediate. The midrange component of the extended signal was supplied to the mixer 22, but the level change in the midrange component was added. When the load is small, the bandpass filter 24 may be removed. Also, the midrange component Even if the level change in the By increasing the number, the mid-frequency component also passes through the low-pass filter 20. Then, the bandpass filter 24 may be removed. Also, in the above example, the delay Although the two intermediate outputs extracted from the means 14 are described, three or more intermediate outputs may be extracted. In that case, the intermediate output with the shortest delay time is the low-pass filter as in the above embodiment. And the other intermediate outputs are band pass filters with different pass bands. You can supply it to However, a bandpass filter with a short delay time is supplied. The lower the pass band, the better. In both of the above embodiments, the input signal is an analog signal. In the case of a digital signal processor (DSP), the input signal is The present invention can be implemented even in the case of digital signals.

[0013]

[Effect of device]

  As described above, according to the first aspect of the present invention, the delay time is longer than the final output from the delay means. Is configured to take a short intermediate output and mix its low frequency components with the input signal. Therefore, the addition of level changes to the low-frequency components of the input signal is reduced, and You can get a nice chorus effect. According to the second invention, the delay time is Each different intermediate output is taken out from the delay means, and these are made a band division filter. So that the lower the frequency component, the shorter the delay time is supplied to the mixing means. Since it is configured to, the lower the frequency component of the input signal frequency component, the shallower the modulation It gives a natural chorus effect.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a chorus effect adding device according to the present invention.

FIG. 2 is a block diagram of a conventional chorus effect adding device.

[Explanation of symbols]

14 Delay means 16 clock generation circuit 18 Modulation circuit 20 low pass filter 22 mixer 24 band pass filter 26 High pass filter

Claims (2)

[Scope of utility model registration request] 1. A delay means capable of delaying an input signal to change a delay time, a varying means for varying the delay time in the delay means, a final output signal of the delay means and the input signal. A chorus effect adding device comprising mixing means, a low-pass filter for passing a low-pass component of the intermediate output signal extracted from the middle of the delay means and supplying the low-pass component to the mixing means, and a final filter of the delay means. A chorus effect adding device comprising: a filter provided between the output and the mixing means, and supplying a signal obtained by removing at least the low frequency component from the final output signal of the delay means to the mixing means. . 2. A delay means capable of delaying an input signal to change the delay time, a varying means for varying the basic delay time of the delay means, and a plurality of different intermediate positions of the delay means. A band division filter configured to input intermediate output signals with different delay times and to reduce the frequency components to be extracted in order from the one with the longest delay time to the one with the shortest delay time among these intermediate output signals. , A filter for inputting the final output signal of the delay means and extracting frequency components other than the frequency components respectively extracted by the band division filters, and a mixing means for mixing the output signal of each filter and the input signal. , A chorus effect adding device provided.