JP2020114118A - Power correction device and power correction method - Google Patents

Abstract

To provide a power correction device and a power correction method capable of performing noise removal and sound quality improvement with more simple configuration.SOLUTION: A power correction device according to an aspect of the present invention having a first signal line transmitting an input signal supplied from a power source and a second signal line transmitting a circuit direction measuring signal which becomes a pair with the input signal supplied from the power source, comprises: a capacitor for receiving an input of the input signal; a resistor connected to the capacitor; a feedback circuit connected to the resistor; and an inverter circuit connected to the feedback circuit. A power correction method according to another aspect of the present invention removes high-frequency noise with respect to the input signal supplied from the power source and a signal generated due to load fluctuation, and generates a phase delay with respect to a low-frequency input signal component.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power correction device and a power correction method.

For household electronic devices, such as high-end audio and liquid crystal displays, it is common to use an outlet directly connected to a commercial power source supplied from a power company. Usually, the electric power supplied from the electric power company to the home is constituted by a voltage of 100 V or 200 V and a sine wave alternating current with a frequency of 50 Hz or 60 Hz, and the home electronic device is also designed to correspond to the above voltage and frequency. ..

However, the electric power supplied from the electric power company is affected by external influences such as substations, electric wires, etc. passing through, and further by other devices in the home such as operation of semiconductor elements provided in connected home electric appliances. Due to the effect, it is not a perfect sine wave, and distortion including harmonics has occurred. For example, in conventional switching-type inverter control using PWM technology, noise is generated from the built-in switching circuit even if it is lightweight, so the noise of the power supply device itself mixes into the power supply output, and to reduce the noise. There is a problem that a filter circuit must be added to the above, and for example, in the above high-end audio or the like, the performance such as hearing is affected.

A technique for correcting a voltage waveform including distortion in this way is proposed, for example, in Patent Document 1 below.

Further, the applicant of the present patent has proposed a technique described in Patent Document 2 below as a device for performing voltage correction.

JP, 2004-194380, A Patent No. 5818395

However, the technique described in Patent Document 1 causes an increase in the size of the device and a complication of the configuration such that a large amplifier must be provided for amplifying the waveform even if the reference sine wave is configured.

Further, according to the technique described in Patent Document 2, although power correction can be performed with a simple configuration, it is specialized in the performance of removing noise, and there is no consideration regarding sound quality improvement such as sound depth. It is enough.

Generally, in music, the depth of the sound can be felt by the presence of appropriate reverberation and reverberation. The sound generated by the power source from which the noise superimposed on the input signal supplied from the power source is removed has a clear sound quality, but it can be said that a device with higher performance can be obtained if a deeper sound can be obtained.

Therefore, in view of the above problems, it is an object of the present invention to provide a power correction device and a power correction method capable of removing noise and improving sound quality with a simpler configuration.

The inventors of the present invention have made earnest studies on the above problems, and have taken into consideration the influence of power change on the load side in a power correction device that is originally arranged in front of a load such as an amplifier (including an audio amplifier and a guitar amplifier). The inventors found that noise correction and sound quality improvement effects can be obtained by performing voltage correction, and completed the present invention.

That is, a power correction device according to one aspect of the present invention includes a first signal line for transmitting an input signal supplied from a power source and a second signal line for transmitting a circuit start signal paired with the input signal supplied from the power source. And a capacitor receiving an input signal, a resistor connected to the capacitor, a feedback circuit connected to the resistor, and an inverting circuit connected to the feedback circuit.

A power correction method according to another aspect of the present invention removes high-frequency noise from an input signal supplied from a power source and a signal generated by a change in load, and removes high-frequency input signal components from the low-frequency input signal component. It causes a phase delay.

As described above, according to the present invention, it is possible to provide a power correction device and a power correction method capable of performing noise removal and sound quality improvement with a simpler configuration.

It is a figure which shows the schematic equivalent circuit of the electric power correction apparatus which concerns on embodiment. It is a figure which shows the image of operation|movement of the electric power correction apparatus which concerns on embodiment. It is a figure which shows the equivalent circuit schematic of the electric power correction apparatus produced in the Example. It is a figure which shows the measurement result of the electric power correction apparatus in an Example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be embodied in many different forms, and is not limited to the specific examples described in the embodiments and examples below.

(Construction)
FIG. 1 is a diagram showing a schematic equivalent circuit of a power correction device (hereinafter referred to as “this device”) 1 according to the present embodiment.

As shown in the figure, the device 1 includes a first signal line W1 for transmitting an input signal supplied from a power source (input side) and a second signal line W1 for transmitting a circuit start signal paired with the input signal supplied from the power source. A voltage correction device including a signal line W2 and a capacitor C for receiving an input signal, a resistor R connected to the capacitor C, a feedback circuit F connected to the resistor R, and a feedback circuit F. The inverting circuit I is provided. The inverting circuit I is connected to the second signal line W2. Further, in the present device 1, the first signal line W1 and the second signal line W2 are respectively connected to acoustic devices (loads) such as amplifiers connected to the present device 1. The device 1 includes these elements and circuits to perform voltage correction.

In the present embodiment, the signal supplied from the power supply is divided into at least an input signal and a circuit base point signal and supplied. Specifically, the device 1 includes at least two signal lines (first signal line W1 and second signal line W2) as described above, one of which is an input signal and the other of which is a circuit base point signal. Each is electrically connected and propagated in the device.

Here, the "input signal" is an AC signal supplied from a power source, preferably an external commercial power source, but is not limited to this, and may be a DC signal supplied from a DC power source as described later. .. Here, from the viewpoint of description, an AC voltage, more specifically, a sine wave signal that changes like a sine wave will be described as an example.

On the other hand, the "circuit base point signal" is a signal that is input in pairs with the above-mentioned input signal, and generally, unlike the fluctuating input signal, it is ideally always 0V to ground. As a result, the voltage difference between the input signal and the circuit base signal becomes the input voltage to the load. Such a voltage supply is a commonly used voltage supply method, for example, with a two-hole outlet and two plugs inserted therein.

Further, in the present embodiment, the input signal is branched in the middle, one is output to the load via the first signal line W1 as it is, and the other is connected to the capacitor C, the resistor R, the feedback circuit F, the inverting circuit I and the like. After being modulated via the output, it is output to the second signal line W2 side. On the other hand, the circuit base point signal supplied from the power source becomes the other output of the output signal by the second signal line W2 after the signal obtained by modulating the input signal is added.

Further, the capacitor C in the device 1 is used to function as a filter in combination with the resistor R in the subsequent stage, and as described above, is connected to the first signal line W1 and receives an input signal from the external power source. As a result, it is possible to shift the phase of a specific frequency component of the input signal, in other words, perform phase delay according to the frequency and output. The number of capacitors C may be one, but a plurality of capacitors C may be connected in series or in parallel to form a circuit.

Further, the capacitance of the capacitor C is not limited as long as it has the above function. However, as long as the output voltage of the feedback circuit and the inverting circuit can be kept within an appropriate voltage range in combination with the resistance of the latter stage, the input signal is AC, the voltage is 50 to 60 Hz, and the voltage is 100 to 100. When the voltage is about 200 V, it is preferably 0.001 μF or more and 0.1 μF or less. When the input signal is direct current, it can be made larger than the above.

The resistor R in the device 1 is used to function as a high-pass filter in combination with the capacitor C, and as described above, is on the first signal line W1 and in series with the capacitor C. By connecting to, the phase of a specific frequency component is shifted and output, in other words, a phase delay can be performed according to the frequency to output. The resistance R may be one as in the case of the capacitor C, but may have a circuit structure in which a plurality of resistances R are connected in series or in parallel.

Also, the resistance value of the resistor R is not limited as long as it has the above-described function, but as described above, when the input signal is AC, the voltage is about 50 to 60 Hz, and the voltage is about 100 to 200 V. It is preferably 1 kΩ or more and 100 kΩ or less. By doing so, a preferable voltage range can be achieved in combination with the capacitor.

Specifically, the filter constant of the high-pass filter composed of the capacitor C and the resistor R is not limited, but is preferably in the range of 1 kHz or more and 25 kHz or less, more preferably 5 kHz or more and 20 kHz or less. is there. By setting this range, it is clear from the description below, but it is possible to remove signals in an unnecessary frequency range, and to improve the sound quality according to the signal generated by the power fluctuation of the acoustic device such as an amplifier as a load. It becomes possible to generate an appropriate reverberation, reverberation, and the like for enhancing.

Further, in the present device 1, the feedback circuit F is used for negatively feeding back a signal such as noise carried on the input signal and is not limited to this, for example, an operational amplifier FA, It is preferable to be configured to include an operational amplifier negative feedback resistor FR connected to the output side of this operational amplifier. In this case, the other terminal of the operational amplifier negative feedback resistor FR is connected to the minus input of the operational amplifier FA, and the plus input is connected to the second signal line W2 side.

In addition, in the present device 1, the inverting circuit I is connected to the feedback circuit F, and subjects the output signal to polarity inversion processing, preferably amplification or attenuation processing. Although the structure of the inverting circuit I is not particularly limited, for example, the inlet side resistor IR1, the operational amplifier IA connected to the inlet side resistor IR1 and the output side of which is input to the negative side, the output side conducting wire of the operational amplifier IA. It is preferable to provide an operational amplifier negative feedback resistor IR2 connected between the negative input side conductor part and an output side resistor IR3 connected to the output side of the operational amplifier IA. The output side conductor of the inverting circuit I is connected to the second signal line W2 as described above. The positive side input of the operational amplifier IA is connected to the second signal line W2 side as in the operational amplifier FA of the feedback circuit F.

A resistor WR is separately arranged in the middle of the second signal line W2. More specifically, the resistor IR3 in the inverting circuit I is connected to the input side of the position where the resistor IR3 is connected to the second signal line W2, and further, the positive terminal of the operational amplifier IA is connected to the second signal line W2. It is placed on the output side rather than the open position. In the present device 1, by providing this resistance WR, even if a signal generated due to a fluctuation on the input side or a fluctuation on the output side (load) occurs, the signal such as noise due to this fluctuation is canceled by following the fluctuation. be able to.

(Operating principle)
Here, a power correction method using the present device 1 (hereinafter referred to as “the present method”) will be described. As described above, this method removes high-frequency noise from the input signal supplied from the power source and causes phase delay with respect to the low-frequency input signal component. FIG. 2 shows an image of phase shift and signal attenuation at the output of the feedback circuit F used in this operation principle.

First, an input signal is input from a power supply and then output to a load such as an amplifier via the first signal line W1. On the other hand, the first signal line W1 is branched on the way, and delays the phase of a specific frequency component via the capacitor C, the resistor R, the feedback circuit F, and the inverting circuit I via the conductor as described above. Specifically, since the frequency component higher than 200 kHz is canceled and the frequency component of 1 kHz or less is greatly attenuated, the present device 1 does not function, and the frequency component (the range of 1 kHz or more and 200 kHz or less) in the meantime is 90 degrees to 0 degrees. It is delayed while changing continuously between degrees. In this case, specifically, an image of frequency delay due to the combination of the resistor R, the capacitor C, and the feedback circuit F is shown in FIG. As shown in this figure, since the frequency component higher than 200 kHz is transmitted without delay, it is directly transmitted to the second signal line W2, while the resistor WR connected to the second signal line W2 has a similar value. The fluctuation component is canceled by the occurrence on the second signal line W2, while the signal of 1 kHz or less is attenuated and can be ignored. On the other hand, a signal of 1 kHz or more and 200 kHz or less is delayed by a certain amount, and as a result, it contributes to appropriate sound quality improvement as reverberation or echo.

On the other hand, the load is connected to the first signal line W1 as described above, and the input signal changes due to the signal processing of the load. That is, the fluctuation caused by the load also serves as an input signal and is input to the circuit portion such as the capacitor C and the resistor R. As a result, the same processing as described above is added to the signal processing of the load.

By the way, when the load is an acoustic device, it naturally includes a frequency component of a sound to be generated. Then, in the present device 1, a delay is generated by specializing in a specific frequency component of the frequency components included in this sound, specifically, the frequency component of the sound that can be recognized by the observer of the sound. Then, this acoustic component is perceived by the observer as echo, reverberation, etc., and is perceived as the depth of sound.

As described above, according to the present invention, it is possible to provide a power correction device and a power correction method capable of performing noise removal and sound quality improvement with a simpler configuration.

Here, the voltage correction device was actually manufactured, and its effect was confirmed by an FFT servo analyzer (R9211B, manufactured by Advantest Corporation). FIG. 3 shows an equivalent circuit diagram of this device, and FIG. 4 shows the result by the FFT servo analyzer.

As a result, it was confirmed that the delay and cancellation of the phase could be confirmed, the filter could function as a filter, and the appropriate reverberation and reverberation could be generated.

Also, for audio enthusiasts or music enthusiasts 5 who own high-end audio equipment themselves (subjects), commercially available audio equipment (high-end speaker system (made by Pioneer), CD player (Teac), amplifier (Acuphase) ), the device is connected (the power plug of the audio device is plugged into the device and the power plug of the device is plugged into an outlet), and the device is not connected (the power plug is plugged directly into the outlet). However, the sound quality was evaluated qualitatively. As a result, when all of the subjects connected this device, a moderate reverberation or reverberation occurred compared to the case where this device was not connected, and the sound quality was greatly improved, such as the depth of the sound increased, and the musical presentation was made. The evaluation result that it improved is obtained. Further, as a result, similar effects could be obtained in the case of audio equipment using a vacuum tube amplifier.

INDUSTRIAL APPLICABILITY The present invention has industrial applicability as a power correction device and a power correction method.

Claims (4)

A first signal line for transmitting an input signal supplied from a power source,
A second signal line which is supplied from the power source and transmits a circuit starting point signal which forms a pair with the input signal;
A power correction apparatus comprising: a capacitor receiving the input signal, a resistor connected to the capacitor, a feedback circuit connected to the resistor, and an inverting circuit connected to the feedback circuit. The power correction device according to claim 1, wherein the feedback circuit performs a phase delay according to a frequency. The power correction device according to claim 1, wherein the filter constant in the feedback circuit is in the range of 1 kHz to 25 kHz. A power correction method for removing high-frequency noise from an input signal supplied from a power source and a signal generated by a change in load and causing a phase delay with respect to a low-frequency input signal component.