JP7182268B2 - Power correction device and power correction method - Google Patents

Description

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

2. Description of the Related Art Home electronic devices, such as high-end audio equipment and liquid crystal displays, are generally used by directly connecting an outlet to a commercial power source supplied from an electric power company. Normally, the power supplied from electric power companies to homes consists of sine wave alternating current with a voltage of 100 V or 200 V and a frequency of 50 Hz or 60 Hz, and household electronic devices are designed to support the above voltages and frequencies. .

However, the power supplied from the electric power company is affected by external factors such as substations and power lines that pass through, and by other devices in the home such as the operation of semiconductor devices provided in connected home appliances. Due to the influence, it is not a perfect sine wave, and distortion including harmonics has occurred. For example, in conventional switching inverter control using PWM technology, noise is generated from the built-in switching circuit even if it is lightweight. In the case of high-end audio, for example, there is a problem that performance such as audibility is affected.

A technique for correcting a voltage waveform including such distortion is proposed in, for example, Japanese Patent Application Laid-Open No. 2002-200312.

In addition, the applicant of the present patent has proposed a technique described in Patent Document 2 below as a device for correcting voltage.

Japanese Patent Application Laid-Open No. 2004-194380 Japanese Patent No. 5818395

However, even if the technique described in Patent Document 1 constitutes a reference sine wave, it requires a large amplifier to amplify the waveform, resulting in an increase in the size of the device and a complication of the configuration.

In addition, according to the technique described in Patent Document 2, power correction can be performed with a simple configuration, but it is specialized for noise removal performance, and it is not possible to study sound quality improvement such as sound depth. It is enough.

In general, in music, the depth of the sound can be felt due to the presence of appropriate echoes, reverberations, and the like. The sound produced by the power supply from which the noise superimposed on the input signal supplied from the power supply has been removed has a clear sound quality, but if the sound can be further deepened, it can be said that the device will have higher performance.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power correction device and a power correction method that can remove noise and improve sound quality with a simpler configuration.

The inventors of the present invention have made intensive studies on the above problem, and have found that, in a power correction device that is originally placed in the front stage of a load such as an amplifier (including an audio amplifier and a guitar amplifier), the influence of power changes on the load side is taken into account. The inventors have discovered that noise removal and sound quality improvement effects can be obtained by performing voltage correction, and have completed the present invention.

That is, a power correction device according to one aspect of the present invention includes a first signal line that transmits an input signal supplied from a power source, and a second signal line that transmits a circuit starting point signal paired with the input signal supplied from the power source. and a capacitor for 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.

Further, a power correction method according to another aspect of the present invention removes high-frequency noise from an input signal supplied from a power supply and a signal generated by fluctuations in a load, and removes high-frequency noise from a 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 removing noise and improving sound quality with a simpler configuration.

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

BEST MODE FOR CARRYING OUT THE INVENTION 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 only to the specific exemplifications described in the embodiments and examples given below.

(structure)
FIG. 1 is a diagram showing a schematic equivalent circuit of a power correction device (hereinafter referred to as "this device") 1 according to this embodiment.

As shown in the figure, the device 1 includes a first signal line W1 for transmitting an input signal supplied from a power supply (input side) and a second signal line W1 for transmitting a circuit starting point signal paired with the input signal supplied from the power supply. and a signal line W2, further comprising 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 connected to and an inverting circuit I. Also, the inverter circuit I is connected to the second signal line W2. In the device 1, the first signal line W1 and the second signal line W2 are connected to an acoustic device (load) such as an amplifier connected to the device 1, respectively. The device 1 includes these elements and circuits to perform voltage correction.

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

Here, the "input signal" is an AC signal supplied from a power supply, preferably an external commercial power supply, but is not limited to this, and may be a DC signal supplied from a DC power supply as described later. . From the viewpoint of explanation, 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 as a pair with the above-described input signal, and is ideally always at 0V to the ground, unlike input signals that generally fluctuate. As a result, the voltage difference between the input signal and the circuit base signal is the input voltage to the load. Such a voltage supply is, for example, a popular voltage supply method by means of a two-hole outlet and two plugs inserted therein.

In this embodiment, the input signal is branched on the way, one of which is directly output to the load via the first signal line W1, and the other of which is connected to the capacitor C, the resistor R, the feedback circuit F, the inverting circuit I, and the like. After being modulated through the signal line W2, it is output to the second signal line W2. On the other hand, the circuit base point signal supplied from the power supply becomes the other output signal through the second signal line W2 after being added with a signal obtained by modulating the input signal.

In addition, the capacitor C in the device 1 is used to function as a filter together with the resistor R in the latter stage, and as described above, is connected to the first signal line W1 and receives the input signal from the external power supply. As a result, the phase of a specific frequency component of the input signal can be shifted, in other words, the phase can be delayed 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.

Also, the capacity of the capacitor C is not limited as long as it has the above function. However, it is sufficient if 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. When it is about 200 V, it is preferably 0.001 μF or more and 0.1 μF or less, for example. In addition, when the input signal is a direct current, it can be made larger than the above.

In addition, the resistor R in the device 1 is used to function as a high-pass filter together with the capacitor C. , a specific frequency component can be output with a phase shift, in other words, a phase delay can be performed according to the frequency and the output can be performed. As for the resistor R, as in the case of the capacitor C, it may be one, but it may have a circuit structure in which a plurality of resistors 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 function, but as described above, when the input signal is AC, 50 to 60 Hz, and the voltage is about 100 to 200 V , 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. be. By setting this range, as will be apparent from the description below, signals in unnecessary frequency ranges can be removed, and the sound quality can be improved according to the signal generated by the power fluctuation of the acoustic device such as an amplifier that is a load. Appropriate reverberation, reverberation, etc. can be generated for enhancement.

In addition, in the device 1, the feedback circuit F is used to negatively feed back a signal such as noise on the input signal, and is not limited to this. It is preferable to include an operational amplifier negative feedback resistor FR connected to the output side of this operational amplifier. In this case, the negative input of the operational amplifier FA is connected to the other terminal of the operational amplifier negative feedback resistor FR, and the positive input is connected to the second signal line W2.

In addition, in the device 1, the inversion circuit I is connected to the feedback circuit F, and performs polarity inversion processing, preferably amplification or attenuation processing, on this output signal. The structure of the inverting circuit I is not particularly limited. and negative input side lead wire portion, and an output side resistor IR3 connected to the output side of the operational amplifier IA. As described above, the lead wire portion on the output side of the inverting circuit I is connected to the second signal line W2. The plus side input of the operational amplifier IA is connected to the second signal line W2 side, like the operational amplifier FA of the feedback circuit F described above.

A resistor WR is separately arranged in the middle of the second signal line W2. More specifically, the input side of the position where the resistor IR3 in the inverter circuit I is connected to the second signal line W2, and furthermore, the positive side terminal of the operational amplifier IA is connected to the second signal line W2. placed on the output side of the By providing this resistor WR in this device 1, even if a signal is generated due to fluctuations on the input side or on the output side (load), it follows the fluctuations, thereby canceling signals such as noise due to these fluctuations. be able to.

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

First, an input signal is input from a power supply and then output to a load such as an amplifier through a first signal line W1. On the other hand, the first signal line W1 is branched in the middle, and delays the phase of a specific frequency component via the capacitor C, resistor R, feedback circuit F, and inverter circuit I via the lead wire as described above. Specifically, frequency components higher than 200 kHz are canceled, and frequency components of 1 kHz or less are greatly attenuated, so the device 1 does not function. It is delayed while continuously changing between degrees. In this case, specifically, an image of the frequency delay due to the combination of resistor R, capacitor C and feedback circuit F is shown in FIG. As shown in the figure, since frequency components higher than 200 kHz are transmitted without delay, they are transmitted to the second signal line W2 as they are. While the variation caused by the second signal line W2 is canceled, the signal of 1 kHz or less is attenuated and can be ignored. On the other hand, since the signal of 1 kHz or more and 200 kHz or less is delayed by a certain amount, it contributes to appropriate sound quality improvement as reverberation or reverberation.

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

By the way, when the load is an acoustic device, it naturally contains frequency components of the sound to be generated. Then, the device 1 generates a delay by specializing a specific frequency component among the frequency components contained in the sound, specifically, a frequency component of the sound that can be recognized by the observer of the sound. Then, this acoustic component is recognized as reverberation, reverberation, etc. by the observer, and is recognized as the depth of the 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 removing noise and improving sound quality with a simpler configuration.

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

As a result, it was confirmed that phase delay and cancellation could be confirmed, and it was confirmed that it could function as a filter and produce moderate reverberation and reverberation.

In addition, for five audiophiles or music lovers who own high-end audio equipment themselves (subjects), commercially available audio equipment (high-end speaker system (manufactured by Pioneer), CD player (Teac), amplifier (Accuphase) ), and when this device is connected (the power plug of the audio device is inserted into the device and the power plug of this device is also inserted into the outlet), and when it is not connected (the power plug is directly inserted into the outlet). A qualitative evaluation of the sound quality was performed by comparing the equipment in a state where it was only used. As a result, when all the subjects connected the device, there was moderate reverberation or reverberation compared to when the device was not connected, and the sound quality was greatly improved, such as the depth of the sound increasing, and the musical presentation was improved. We obtained the evaluation result that it was improved. In addition, similar results 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 an AC power supply;
a second signal line that is supplied from the AC power supply and transmits a circuit starting point signal paired with the input signal, the voltage correction device further comprising:
A capacitor connected to the first signal line for transmitting the input signal, a resistor connected to the capacitor, a feedback circuit connected to the resistor, and connected to the feedback circuit to be output to the second signal line an inverting circuit. 2. The power correction device according to claim 1 , wherein said capacitor and said resistor together function as a high-pass filter, and perform phase delay according to the frequency of said input signal . 3. The power correction device according to claim 2 , wherein the filter constant of said high-pass filter is in the range of 1 kHz or more and 25 kHz or less. a first signal line for transmitting an input signal supplied from an AC power supply; and a second signal line for transmitting a circuit starting point signal supplied from the AC power supply and paired with the input signal; a capacitor connected to the first signal line for transmitting, a resistor connected to the capacitor, a feedback circuit connected to the resistor, an inverting circuit connected to the feedback circuit and output to the second signal line, A power correction method that removes high-frequency noise from the input signal supplied from the AC power supply and the signal generated by the fluctuation of the load and causes a phase delay to the low-frequency input signal component by the power correction device comprising .

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