JPS59105707A - Acoustic effect device - Google Patents

Abstract

PURPOSE:To increase both low and high band components of music by obtaining an input waveform through a low-pass filter for increment of a low band to obtain the 1/2 or 1/4 division by a frequency divider and then performing multiplication with a squaring device, etc. for a high band via a high-pass filter to add both low and high band increment components to the input signal. CONSTITUTION:One of both input signals is connected to an adder 1, and the other is connected to a low-pass filter 2 and a high-pass filter 3 respectively. The outputs of these two filters are connected to a frequency divider 4 and a multiplier 5 respectively and furthermore to a voltage gain controller 89 via each band-pass filter and a rectifier 67. The gain is controlled in response to the envelope (amplitude change in terms of time) of the input signal for the output signals of the divider 4 and the multiplier 5. Thus both low and high frequency components are obtained and connected to the adder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sound effect device that produces sound quality according to the listener's preference in a sound reproduction system that reproduces records, tapes, etc. on which music is recorded using an amplifier and speakers. It is something.

Structure and Problems of Conventional Examples This type of effect device includes the following. In other words, there are (117 loudness control), (2) graphic equalizer with multiple stages of narrowband equalizer, (31 tone control, etc.) as methods that belong to the method of enhancing the frequency response in the low and high ranges. 714, there is a pitch conversion device etc. that changes the writing speed and reading speed of the input signal and outputs low-frequency components isometrically, but regarding (1) and (3) above, tape record This leads to an increase in player running noise, hiss, etc., and also regarding pitch conversion, it is on the stone side, and L/2,
When changing by a factor of 2, etc., the continuity of the waveform is lost.
l.It causes deterioration in sound quality.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the conventional methods, such as increased noise and loss of waveform continuity, and to improve musicality without deteriorating sound quality.

In particular, regarding noise, without enhancing high and low frequencies,
Since the fundamental frequency is divided and multiplied using a squarer, noise does not increase. Furthermore, regarding the continuity of the waveform, we do not use methods such as cutting the waveform to control it.
Continuity is maintained.

Configuration of the Invention In the configuration of the present invention, for low-frequency enhancement, the input waveform is obtained by a low-pass filter and then divided by 1/2 or V4 by a divider. Further, the l/r11 signal has a gain I11 of η1 whose amplitude changes over time, and uses a voltage gain controller or the like to control the level of the frequency-divided signal with a voltage corresponding to the input signal. Also, for high frequency enhancement, t:1 region j
+(1) Multiplying is performed by a squarer etc. through an overfilter, and the high frequency component in the music component operates a voltage gain controller to produce a waveform that is more than twice as large as the input fM. The output is 5 and 1 - stomach. In this way?! (4 (Jj;
A circuit is constructed in which the j$ enhancement component and the high frequency i1J strong component are added to the input signal. Furthermore, in this f]i configuration,
If this signal is applied to the stereo second channel signal separately, cross-modulation distortion may occur in the signal phase between both channels. In other words, in 2-channel playback,
Since the sound image Gj in the center is input at the same level, when it is passed through a square circuit, the result will be as follows.

Here, L is the L channel signal level. In other words, is L to the power of k↓? 6.2LR, resulting in intermodulation distortion. Therefore, here (L - R)
By obtaining 2L+R-2LR and adding it to the square of the sum signal, we get (L+11)"+(L-Rf=
(2L + 21<)? ML is generated which removes the modulation t. This output is converted to a level corresponding to the human input signal using the n3 pressure gain controller as described above.

DESCRIPTION OF THE EMBODIMENTS The present invention will now be described in detail with reference to an embodiment indicated by N1. In FIG.
), the other to a low-pass filter (2) and a surface-pass filter (3).

Here, the two filter outputs are connected to a frequency divider (41) and a multiplier (5), respectively.Furthermore, those outputs are
The output signals of the frequency divider (4) and multiplier (5) are connected to the voltage gain controllers (8) and (9) through the rectifiers (6) and (7) through the respective bandpass filters, and the output signals of the frequency divider (4) and the multiplier (5) are input signals. According to the envelope (temporal amplitude change) of i:li (%J is controlled, however, the frequency relative component and the high frequency acid component are obtained, and the adder (1)
connected to.

It is. In FIG. 2, the input 2-channel signal is passed through an adder QO and a subtracter aυ to obtain a difference signal from the sum of 1 to C and 1d. Furthermore, only high frequency components are obtained through a high pass filter ua u:v. Here, each number 46 is a squarer u41θ
Through Q, (L+R) and (LR)f are obtained. The sum signal component and the difference signal component are connected to the automatic gain controller if>, + (II l) through the rectifier circuit 0 and α power, respectively, and (L+R)
, (LR) signals 1 are controlled, intermodulation distortion is removed via an adder (A), and mixed with the original sound signal A at a level according to the listener's preference. For this purpose, a resistor CD is connected through the resistor M to the resistor (2).

Furthermore, FIG. 3 shows a configuration in which the gain controller is integrated into one,
The sum signal and the difference signal are passed through a high frequency filter (2) αa,
The signals are added by an adder (c) through the rectifier circuit (tq output) and connected to the gain controller 08).

Effects of the Invention As described in detail in the embodiments above, according to the present invention, in order to enhance the low range and sound range of roses and stones of tape etc., the enhancement of the low range and high range components of music is reduced and the musicality is strengthened. 1. It is intended to be

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing an example of application in stereo reproduction. (]) is an adder, (2) is a reduced pass filter, (3)
is a high-pass filter, (4) is a divider, (5) is a multiplier, (6) and (7) are rectifiers, and (8) and (9) are voltage gain controllers.

Claims (1)

[Claims] (1) In a music playback device that plays a music source through an amplifier and a speaker, a low-pass filter, a gain controller,
Consisting of a high-pass filter, a frequency divider, a squarer, and an adder, it divides the input music signal and transmits a part of the signal directly to the frequency converter, and also transmits the input signal via the low-pass filter. Detecting the low frequency component of the signal (7. Through the splitter, the gain controller outputs the low frequency component with an amplitude corresponding to the amplitude of the input signal, and through the high pass filter,
The high-frequency component of the input signal is detected, and the high-frequency component is output via the squarer with an amplitude corresponding to the input high-frequency component by another gain controller, and the direct sound component, low-frequency component, and A sound effect device that adds high-frequency components using an adder. (2. In the sound effect device according to claim 1, when squaring, the sum signal of the stereo second channel signal and the difference signal are each squared, and both output signals are added.
A sound effect device consisting of a gain controller.