A circuit for improving sound output of an audio system

Abstract

A circuit for improving a sound output of an audio system comprising: input terminals for receiving an electric current from the audio system; a filter circuit connected across the input terminals for filtering a signal by passing predefined frequencies comprising: at least one resistor connected in series with the at least one input capacitor; at least one inductor connected in series with the filter circuit; one or more semiconductor diodes connected in parallel with the at least one inductor; output terminals for outputting a predetermined amount of the electric current; wherein the circuit further comprising an output capacitor connected in series with the one or more diodes across the output terminals, such that the operative connection of the filter circuit, output capacitor in series connection with a third semiconductor diode, and parallel arrangement of at least one inductor and the one or more semiconductor diodes form a single integrated circuit.

Description

[0001] A CIRCUIT FOR IMPROVING SOUND OUTPUT OF AN AUDIO SYSTEM

[0002] FIELD OF INVENTION

[0003] The present invention relates to a circuit for improving sound. More particularly, the invention relates to a circuit for improving a sound output of an audio system.

[0004] BACKGROUND OF THE INVENTION

[0005] Audio systems often struggle to reproduce the full spectrum of audible frequencies, resulting in a thin, lifeless sound lacking bass and harmonic richness. This issue is especially prevalent in budget-priced systems and portable devices due to limitations in power, processing capabilities, and speaker size. Additionally, the limited frequency response can significantly affect the listening experience, reducing immersion and clarity, particularly in complex music or movie soundtracks. There are existing techniques that attempt to adjust the frequency response but are often found lacking in dynamic range and adaptability.

[0006] Many technologies have been implemented to improve on such circuits for improving audio quality. One such example is a United States patent with publication no. US11251802B1 which discloses a digital-to-analog converter (DAC) which includes a plurality of reference modules, an output capacitor configured to output the analog voltage, and a sharing switch couples between the output capacitor and the reference modules. The reference modules are mutually connected in parallel. Each reference module includes a reference capacitor and a reference switch connected in series. A plurality of reference capacitances of the reference capacitors are substantially identical. The reference switches are controlled by a plurality of control signals. The control signals are corresponding to a control code. The DAC produces an analog voltage according to the control code. An analog difference, between a first analog voltage corresponding to a first control code and a second analog voltage corresponding to a second control code, monotonically increases or monotonically decreases as a first value corresponding to the first control code increases. The first control code is consecutive to the second control code.

[0007] A Japanese patent with publication no. JP3335907B2 discloses a circuit, to which a resistor and a DC power source are serially connected, and the circuit, to which a circuit provided with at least one of inductors and a diode biased forward are serially connected, are respectively parallelly connected to the signal path between an input terminal and an output terminal. Then, capacitors are serially connected on the input side and output side of that signal path. Thus, the distortion compensating circuit is constituted for reducing amplitude phase distortion by having characteristics inverse to the amplitude characteristics of an amplifier connected to the preceding or following step.

[0008] A Chinese patent with publication no. CN209845253U discloses a high-efficiency fullbalance HiFi tuning earphone amplifier. The working frequency of the switching power supply chip is far higher than the frequency range of the sound box; audio line cannot be influenced using class A and class B amplification lines, the working voltage of the earphone amplifier is adjusted by simply changing the voltage-regulating resistor VR1 and the voltage-regulating switch Pl. Although the resistance value of the bias resistor of the triode is not changed, the change of the working voltage enables the static working current of the triode to be correspondingly changed, the pushing force and the listening feeling acting on the earphone are changed, and the design and the occupied space of a circuit are greatly simplified.

[0009] Further, a British patent with publication no. GB2507776A discloses a filter circuit which removes noise from a supply of direct current. During normal current drawing conditions, a common mode bifilar inductor provides rejection of common mode noise between positive and negative input and output terminals. During transient current drawing condition, the bifilar inductor is short circuited by the provision of two forward biased diodes to maintain output voltage. The filter can be provided as a standalone filter circuit for connection to a power supply, or can be incorporated into a power supply unit or an audio amplifier. The filter circuit may be used in audio signal amplification apparatus, for example for an electric guitar.

[0010] SUMMARY OF INVENTION

[0011] An object of the present invention is to provide a circuit that capable of improving a sound output of an audio system by removing or filtering unwanted noise and frequencies from an input audio.

[0012] In one aspect of the present invention, there is provided a circuit for improving a sound output of an audio system, the circuit comprising: input terminals for receiving an electric current from the audio system; a filter circuit connected across the input terminals for filtering a signal by passing predefined frequencies, the filter circuit comprising: at least one input capacitor; and at least one resistor connected in series with the at least one input capacitor; at least one inductor connected in series with the filter circuit; one or more semiconductor diodes connected in parallel with the at least one inductor; and output terminals for outputting a predetermined amount of the electric current; wherein the circuit further comprising an output capacitor connected in series with the one or more diodes across the output terminals, such that the operative connection of the filter circuit, the output capacitor in series connection with a third semiconductor diode, and the parallel arrangement of the at least one inductor and the one or more semiconductor diodes form a single integrated circuit which improves the sound output of the audio system.

[0013] Preferably, the at least one inductor comprises a first inductor connected between a positive input terminal and a positive output terminal; and a second inductor connected between a negative input terminal and a negative output terminal. Preferably, the one or semiconductor diodes comprises of a first semiconductor diode connected in parallel with the first inductor; a second semiconductor diode connected in parallel with the second inductor; and a third semiconductor diode connected in series with the output capacitor.

[0014] Preferably, the first semiconductor diode comprises an anode side connected to the positive input terminal and a cathode side connected to the positive output terminal.

[0015] Preferably, the second semiconductor diode comprises a cathode side connected to the negative input terminal and an anode side connected to the negative output terminal.

[0016] Preferably, the one or more semiconductor diodes is further configured with the first semiconductor diode having the cathode side connected to the positive input terminal and the anode side connected to the positive output terminal; whereas the second semiconductor diode having the anode side connected to the negative input terminal and the cathode side connected to the negative output terminal.

[0017] Preferably, the input terminals are supplied with an alternating current.

[0018] Preferably, the audio system is a high-fidelity audio system.

[0019] In another aspect of the present invention, there is provided a circuit for improving a sound output of an audio system, the circuit comprising input terminals for receiving an electric current from the audio system, at least one inductor, one or more semiconductor diodes connected in parallel with the at least one inductor, and output terminals for outputting a predetermined amount of the electric current, wherein the at least one inductor comprises an inductor connected between a positive input terminal and a positive output terminal, and / or another inductor connected between a negative input terminal and a negative output terminal. One skilled in the art will readily appreciate that the present invention is well adapted to carry out the objects and obtain the ends and advantages mentioned, as well as those inherent therein. The embodiment described herein is not intended as limitations on the scope of the invention.

[0020] BRIEF DESCRIPTION OF THE DRAWINGS

[0021] For the purpose of facilitating an understanding of the invention, there is illustrated in the accompanying drawing the preferred embodiments from an inspection of which when considered in connection with the following description, the invention, its construction and operation and many of its advantages would be readily understood and appreciated.

[0022] FIG. 1 illustrates a preferred embodiment of a circuit diagram for improving a sound output of an audio system.

[0023] FIG. 2 illustrates an alternative embodiment of a circuit diagram for improving the sound output of the audio system.

[0024] FIG. 3 illustrates an exemplary embodiment of a schematic diagram representing a connection between an audio input device, the circuit, and speakers.

[0025] DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention relates to the field of electrical engineering. More particularly, the present invention relates to an electric circuit for improving a sound output of an audio system. Hereinafter, the invention shall be described according to the preferred embodiments of the present invention and by referring to the accompanying description and drawings. However, it is to be understood that limiting the description to the preferred embodiments of the invention is merely to facilitate discussion of the present invention and it is envisioned that those skilled in the art may devise various modifications without departing from the scope of the appended claim.

[0027] From here on, the following terms have the meanings as indicated. The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items. The terms “having,” “comprising,” “including,” and “variations” thereof signify the presence of a component.

[0028] The invention will now be described in greater detail, by way of example, with reference to the drawings.

[0029] In an aspect of the present invention, a circuit for improving a sound output of an audio system is disclosed. The inventive aspects of the invention along with various components and engineering involved will now be explained with reference to FIG. 1 - 14 herein.

[0030] FIG. 1 illustrates a schematic design of a circuit 100 for improving sound output of an audio system, preferably for a high-fidelity (HiFi) audio system. In other aspects of the present invention, the circuit 100 may also be used with other audio input devices 13 such as smartphones, MP3 players, or the likes. More specifically, FIG. 1 illustrates the schematic diagram indicating the connection of all the wires and components in the circuit 100 for improving sound output of an audio system. As shown in FIG. 1, the circuit 100 includes input terminals 9, 10 for receiving an electric current. The input terminals 9, 10 may include a positive input terminal 9 and a negative input terminal 10 that is connected to an audio input device or a main power supply, such that an input voltage VIN may be developed across the input terminals 9, 10. Preferably, the electric current supplied to the input terminals 9, 10 is an alternating current (AC) or a direct current (DC).

[0031] Referring to FIG. 1, the circuit 100 includes a filter circuit which is connected across the input terminals 9, 10 for filtering a signal by passing predefined frequencies. The filter circuit includes at least one input capacitor 1 and at least one resistor 2 connected in series with the at least one input capacitor 1. More specifically, the filter circuit functions in a way that it alters a frequency content of an electrical signal passing through it, which may remove unwanted frequencies such as noise, or bypass desired frequencies. In a preferred embodiment, the arrangement of the input capacitor 1 and the resistor 2 connected in series across the input terminals 9, 10 may act as a low-pass filter which blocks high frequency signals while allowing low-frequency signals to pass through and may charge up and discharge at a rate of the frequency of the incoming signal.. Further, the resistor 2 reduces the overall amplitude of the signal by adding resistance to the flow of current entering the filter circuit as well.

[0032] The specific filtering characteristics of the filter circuit depend on the capacitance of the input capacitor 1 and the resistance of the resistor 2. More specifically, by changing the values of capacitance and resistance, a cutoff frequency of the filter circuit may be adjusted, which is the frequency at which the filter circuit starts to attenuate the signal. Assuming an input sound frequency is within a hearing range of 20 Hz to 20 kHz, distortion due to imbalance in electrical noise or unwanted electrical signals may occur upon reaching the limits of the hearing range. By way of example, lows, also known as bass for a typical sound output would have frequencies below approximately 250 Hz, midrange frequencies are approximately between 250 Hz and 4 kHz, while highs, or trebles, have frequencies above approximately 4 kHz. Depending on the type of sound profile for the different audio inputs, instances where these frequencies are exceeded may cause sound distortions. Preferably, the arrangement of the input capacitor 1 and the resistor 2 enables the input signal to be stabilized, particularly for midrange frequencies, while the arrangement of the output capacitor 7 and the third semiconductor diode 8 may improve the damping of the bass by increasing its frequency back to approximately 250 Hz, if the bass frequency drops too low. This way, it prevents any excessive vibrations that may occur from lower frequencies that may potentially reduce the quality or distorts the output sound quality. Additionally, the arrangement of the inductor coils 3, 5 and the first and second semiconductor diodes 4, 6 enables the stabilization of both the midrange frequencies and the high frequencies. In turn, improving quality of vocal sounds, adding warmth and crispness to upper harmonics of instruments present in the audio input.

[0033] As shown in FIG. 1, the circuit 100 further includes at least one inductor 3, 5, which is preferably an air-cored inductor coil. An air-core inductor coil is a type of inductor where the coil is wound around a form, and the core within the coil is made of air or a non-magnetic material. Unlike other types of inductors that use magnetic materials such as iron or ferrite as cores, an air-core inductor relies on the magnetic properties of the surrounding air. In a preferred embodiment, the at least one inductor 3, 5 may include a first inductor 3 connected in series with the filter circuit. Particularly, the first inductor 3 is connected between the positive input terminal 9 and a positive output terminal 11, and a second inductor 5 also connected in series with the filter circuit, in which the second inductor 5 is connected to a negative input terminal 10 and a negative output terminal 12.

[0034] In a preferred embodiment, the circuit 100 further includes one or more semiconductor diodes 4, 6, 8 comprising a first semiconductor diode 4 that is connected in parallel with the first inductor 3 and a second semiconductor diode 6 that is connected in parallel with the second inductor 5. Preferably, the first semiconductor diode 4 has an anode side that is connected to the positive input terminal 9 and a cathode side connected to the positive output terminal 11, whereas the second semiconductor diode 6 has a cathode side that is connected to the negative input terminal 10 and an anode side connected to the negative output terminal 12. The reactance of the first inductor 3 and the second inductor 5 may increase with the frequency of the input signal thereby making it difficult for high-frequency signals to pass through. More particularly, when the electrical current through the first inductor 3 and the second inductor 5, decreases rapidly, such as when a switch is turned off, the first inductor 3 and second inductor 5 may attempt to induce a voltage to oppose the change in current, resulting in a spike in voltage. This spike in voltage may potentially damage the other components in the circuit. Therefore, the parallel arrangement of the first semiconductor diode 4 and the second semiconductor diode 6 with the first inductor 3 and the second inductor 5 respectively, provides an alternative path for the current to flow, preventing the voltage spike, and in turn, preventing an overload of current that may damage the components within the circuit 100.

[0035] In another embodiment of the present invention, when the current through the first inductor 3 and the second inductor 5 increases, such as when the inductance is high leading to high direct current (DC) resistance), causes a voltage drop. When a current peak occurs, the first semiconductor diode 4 and the second semiconductor diode 6 may quickly bypass the first inductor 3 and the second inductor 5, allowing the full current to flow without a significant voltage drop, thereby maintaining the audio output voltage VOUT. Therefore, the first semiconductor diode 4 and the second semiconductor diode 6 are configured to be connected in parallel combination with the first inductor 3 and the second inductor 5 respectively in the forward direction to prevent such sudden voltage drops during high current flow.

[0036] Referring to FIG. 1, the output terminals 11, 12 include the positive output terminal 11 and a negative output terminal 12 connected to a load, such that an output voltage VOUT is developed across the output terminals 11, 12. In a preferred embodiment, the circuit 100 includes at least one output capacitor 7 connected across the output terminals 11, 12. As illustrated in FIG. 1, the one or more semiconductor diodes 4, 6, 8 include a third semiconductor diode 8 connected in series with the output capacitor 7. Preferably, the semiconductor diode 8 may be disposed in between the negative output terminal 12 and the output capacitor 7.

[0037] In various embodiments of the present invention, the operative connection of the filter circuit, the output capacitor 7 in series connection with the third semiconductor diode 8, and the parallel arrangement of the at least one inductor 3, 5 and the one or more semiconductor diodes 4, 6 form a single integrated circuit for the improvement of the sound output of the audio system. As a result, the circuit 100 may normalize the frequency of the audio input when the input current flows through the circuit 100, subsequently reducing noise within the frequency in the process.

[0038] Referring to FIG. 2, an alternative embodiment of the circuit 100 is shown in which the orientation of the first semiconductor diode 4 and the second semiconductor diode 6 are reversed to control the direction of the current flow in the circuit. Preferably, the first semiconductor diode 4 may be configured with the cathode side being connected to the positive input terminal 9 and the anode side being connected to the positive output terminal 11. As shown in FIG. 2, the second semiconductor diode 6 has the anode side connected to the negative input terminal 10, and the cathode side connected to the negative output terminal 12. The working of the circuit 100 may be explained further herein.

[0039] Firstly, the alternating current may be received from the input terminals 9, 10 which causes the generation of a signal. Thereafter, the signal is filtered through the filter circuit, enabling passing, or amplification of certain frequencies while attenuating other frequencies. The filtered signal may then pass through the parallel connection of the first inductor 3 and the first semiconductor diode 4 and the parallel connection of the second inductor 5 and the second semiconductor diode 6. Thereafter, the signal may be passed through the series connection of the output capacitor 7 and the third semiconductor diode 8, which normalizes the frequency of the signal, and consequently results in a reduction of noise within the frequency.

[0040] FIG. 3 illustrates another alternative embodiment of the circuit 100 is shown in which the orientation of the first semiconductor diode 4 and the second semiconductor diode 6 are both facing the same direction towards the output terminals 11, 12. Preferably, the first semiconductor diode 4 may be configured with the anode side being connected to the positive input terminal 9 and the cathode side being connected to the positive output terminal 11. As shown in FIG. 3, the second semiconductor diode 6 also has the anode side connected to the negative input terminal 10, and the cathode side connected to the negative output terminal 12.

[0041] FIG. 4 illustrates yet another alternative embodiment of the circuit 100, such that the orientation of the first semiconductor diode 4 and the second semiconductor diode 6 are oriented in the same direction facing the input terminals 9, 11. Preferably, the first semiconductor diode 4 may be configured with the cathode side being connected to the positive input terminal 9 and the anode side being connected to the positive output terminal 11. As shown in FIG. 4, the second semiconductor diode 6 also has the cathode side connected to the negative input terminal 10, and the anode side connected to the negative output terminal 12.

[0042] It shall be noted that the exemplary embodiments discussed herein are alternative embodiments of the present invention based on the various combination and configurations of the present invention.

[0043] FIG. 5 to FIG. 12 illustrates further exemplary embodiments based on various combinations and combination of the components of the present invention. In this aspect of the present invention, there is provided the circuit 100 comprising the input terminals 9, 10 for receiving the electric current from the audio system or various audio devices 13, at least one inductor 3, 5, one or more semiconductor diodes 4, 6, connected in parallel with the at least one inductor 3, 5, and output terminals 11, 12 for outputting a predetermined amount of the electric current, wherein the at least one inductor 3, 5 comprises the inductor 3 connected between the positive input terminal 9 and the positive output terminal 11. Preferably, the other inductor 5 may be connected between the negative input terminal 10 and the negative output terminal 12. Additionally, the parallel arrangement of the at least one inductor 3, 5 and the one or more semiconductor diodes 4, 6, form a single integrated circuit 100 which improves the sound output of the audio system.

[0044] Referring to FIG. 5, the positive terminal 9 may be directly connected to the positive output terminal 11. In this embodiment the positive input terminal 9 and the negative input terminal 10 may not be connected, such that the closed circuit from the negative input terminal 10 and the negative output terminal 12. The closed circuit may comprise the inductor coil 5 arranged in parallel with the semiconductor diode 6, such that the cathode side of the semiconductor diode 6 may be connected to the negative input terminal 10 and its anode side may be connected the negative output terminal 12.

[0045] Referring to FIG. 6, the negative input terminal 10 may be directly connected to the negative output terminal 12. In this embodiment, the inductor coil 3 maybe connected to positive input terminal 9 and the positive output terminal 11, and may also be arranged in parallel with the semiconductor diode 4. Preferably, the semiconductor diode 4 has its anode side connected to the positive input terminal 9, while its cathode side may be connected to the positive output terminal 11.

[0046] FIG. 7 illustrates an exemplary embodiment similarly to FIG. 6, whereby the negative input terminal 10 may be directly connected to the negative output terminal 12. The inductor coil 3 may be arranged parallel to the semiconductor diode 4, and is connected to both the positive input terminal 9, and the positive output terminal 11. In contrast with FIG. 6, the cathode side of the semiconductor diode 4 may be connected to the positive input terminal 9, while its anode side may be connected to the positive output terminal 11.

[0047] FIG. 8 illustrates an exemplary embodiment of the present invention similarly to FIG. 5, in which the positive input terminal 9 is connected to the positive output terminal 11, and the closed circuit is formed between the negative input terminal 10 and the negative output terminal 12. However, in this configuration, the anode side of the semiconductor diode 6 is connected to the negative input terminal 10, while the cathode side is connected to the negative output terminal 12.

[0048] FIG. 9 to FIG. 12 illustrate similar configurations as FIG. 1 to FIG. 4, in which the first inductor coil 3 is connected to the positive input terminal 9 and the positive output terminal 11, while the second inductor coil 5 is connected to the negative input terminal 10 and the negative output terminal 12. Preferably, the first semiconductor diode 4 may be arranged in a parallel with the first inductor coil 3, while the second semiconductor diode 6 may be arranged in parallel with the second inductor coil 5. It shall be understood that these embodiments operate without the use of the capacitors 1, 7 the resistor 2, and the third semiconductor diode 8. Nevertheless, a similar result may be obtained, whereby the sound quality that is output may be enhanced with just these components working independently or in tandem with each other. As mentioned above, the arrangments of the components for FIG. 5 to FIG. 12 aims at improving clarity of human vocals and improving crispness and warmth to the harmonics of instruments present in the audio signal.

[0049] In an exemplary embodiment as illustrated in FIG. 13, a schematic diagram of the audio system showing a connection between the circuit 100, an audio input device 13, and speakers 15 is shown. Referring to FIG. 13, the audio system may include the audio input device 14, the circuit 100 for improving the sound output of the audio input device 13, an amplifier 14, and the speakers 15. In an exemplary embodiment, the audio signal from the audio input device 13 may carry electrical noise and unwanted electrical signals that may distort the audio and affect its output sound quality. Therefore, the circuit 100 is provided between the audio input device 13 and the amplifier 14, which enhances the sound output by removing the noise from the output of the audio input device 13, ensuring a clear signal for the amplifier 14.

[0050] As shown in FIG. 13, the audio signal may enter the amplifier 14 which receives the audio signal and amplifies it to a higher power level, in which the amplifier 14 boosts the signal's strength, making it loud enough to drive the speakers 15. The amplified audio signal from the amplifier 14 may then be sent to the speakers 15, which converts the electrical signal back into sound waves and drives the speakers 15. The audio system in this embodiment may be the HiFi audio system as mentioned above, but may also be used with mobile devices as well. Besides that, FIG. 14 illustrates an exemplary embodiment of the schematic diagram of the audio system similar to FIG. 13, only that the circuit 100 may be built in to any one or a combination of the audio device 13, the amplifier 14, and the speakers 15. This configuration allows for the filtering of the electrical noise and unwanted electrical signals to happen within the audio device 13, the amplifier 14, and the speakers 15 respectively, further enhancing the quality of the sound output from said speakers 15. Advantageously, in the present invention, the orientation of the first semiconductor diode 4 and the second semiconductor diode 6 may be reversed to control the direction of the current flow in the circuit 100. In summary, circuit 100 of the present invention may normalize the frequency of the audio input when the input current flows through the circuit 100, also reducing noise within the frequency, thereby improving the sound output of the audio system.

[0051] The present disclosure includes as contained in the appended claims, as well as that of the foregoing description. Although this invention has been described in its preferred form with a degree of particularly, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangements of parts may be resorted to without departing from the scope of the invention.

Claims

CLAIMS1. A circuit (100) for improving a sound output of an audio system, the circuit (100) comprising: input terminals (9, 10) for receiving an electric current from the audio system; a filter circuit connected across the input terminals (9, 10) for filtering a signal by passing predefined frequencies, the filter circuit comprising: at least one input capacitor (1); and at least one resistor (2) connected in series with the at least one input capacitor (i); at least one inductor (3, 5) connected in series with the filter circuit; one or more semiconductor diodes (4, 6, 8) connected in parallel with the at least one inductor (3, 5); and output terminals (11, 12) for outputting a predetermined amount of the electric current; wherein the circuit (100) further comprising an output capacitor (7) connected in series with the one or more diodes (4, 6, 8) across the output terminals (11, 12), such that the operative connection of the filter circuit, the output capacitor (7) in series connection with a third semiconductor diode (8), and the parallel arrangement of the at least one inductor (3, 5) and the one or more semiconductor diodes (4, 6) form a single integrated circuit (100) which improves the sound output of the audio system.

2. The circuit (100) according to claim 1, wherein the at least one inductor (3, 5) comprises a first inductor (3) connected between a positive input terminal (9) and a positive output terminal (11); and a second inductor (5) connected between a negative input terminal (10) and a negative output terminal (12).

3. The circuit (100) according to claims 1 or 2, wherein the one or semiconductor diodes (4, 6, 8) comprises of:a first semiconductor diode (4) connected in parallel with the first inductor (3); a second semiconductor diode (6) connected in parallel with the second inductor (5); and a third semiconductor diode (8) connected in series with the output capacitor (7).

4. The circuit (100) according to any one of the preceding claims, wherein the first semiconductor diode (4) comprises an anode side connected to the positive input terminal (9) and a cathode side connected to the positive output terminal (11).

5. The circuit (100) according to any one of the preceding claims, wherein the second semiconductor diode (6) comprises a cathode side connected to the negative input terminal (10) and an anode side connected to the negative output terminal (12).

6. The circuit (100) according to any one of the preceding claims, wherein the one or more semiconductor diodes (4, 6, 8) is further configured with the first semiconductor diode (4) having the cathode side connected to the positive input terminal (9) and the anode side connected to the positive output terminal (11); whereas the second semiconductor diode (6) having the anode side connected to the negative input terminal (10) and the cathode side connected to the negative output terminal (12).

7. The circuit (100) according to any one of the preceding claims, wherein an alternating current is supplied to the input terminals (9, 10).

8. The circuit (100) according to any one of the preceding claims, wherein the audio system is a high-fidelity audio system.

9. A circuit (100) for improving a sound output of an audio system, the circuit (100) comprising:input terminals (9, 10) for receiving an electric current from the audio system; at least one inductor (3, 5); one or more semiconductor diodes (4, 6) connected in parallel with the at least one inductor (3, 5); and output terminals (11, 12) for outputting a predetermined amount of the electric current; wherein the at least one inductor (3, 5) comprises an inductor (3) connected between a positive input terminal (9) and a positive output terminal (11); and / or another inductor (5) connected between a negative input terminal (10) and a negative output terminal (12); and wherein the parallel arrangement of the at least one inductor (3, 5) and the one or more semiconductor diodes (4, 6) form a single integrated circuit (100) which improves the sound output of the audio system.

Images