JPH0136759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker system for, for example, stereo equipment, electronic musical instruments, trumpet speakers, and the like.

Conventional configuration and its problems An example of the configuration of a conventional speaker system is shown in FIG. Figure 1 shows a typical example of a 2-way configuration consisting of a treble speaker SP1 and a bass speaker SP2.Each speaker SP1 and SP2 is connected to the network circuit 4, which is a dedicated split filter 2 and 3, from the input terminal 1. A signal is transmitted. In such a speaker system, even if the input power is changed, the sound pressure characteristic pattern does not change as shown in FIG. 2, but the sound pressure characteristics shift in parallel. In Figure 2, A is the sound pressure frequency characteristic when the input power is 1/16W, and B is the sound pressure frequency characteristic when the input power is 1/16W.
C is the sound pressure frequency characteristic when the input power is 16W. This parallel-shifting nature of the sound pressure characteristics is preferable for sound reproduction at low sound pressure levels, but the sound pressure level at the listening position is
When playing high-level sound of 90 dB or more, due to human auditory characteristics, the band from 2KHz to 5KHz feels particularly strong, resulting in a harsh sound quality.

An example of a loudness curve showing this phenomenon is shown in FIG. In Figure 3, each curve is an equal loudness line that connects the intensities of pure tones of various frequencies that can be heard at the same loudness, and the numbers shown in the center indicate the loudness of each curved sound in phons. It is something. In this way, even if the physical sound intensity is the same, if the frequency is different, the perceived magnitude will be different.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks, and to change the reproduction characteristics according to the output sound pressure level so that the listener feels the same sound quality even if the output sound pressure level changes. The object of the present invention is to provide a speaker system that can continuously change the amount of sound.

Structure of the Invention The speaker system of the present invention is provided with a parallel resonant circuit having a resistance element whose resistance value changes continuously depending on the magnitude of current in a network circuit. According to this configuration, the Q of the parallel resonant circuit changes depending on the magnitude of the current flowing through the resistance element.
The value (sharpness of resonance) changes continuously, and as a result, the reproduced sound pressure characteristics change continuously depending on the magnitude of the input power, so even if the output sound pressure level changes, the listener remains the same. You can feel the sound quality.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the speaker system of the present invention will be described. FIG. 4 shows an embodiment of the present invention, in which 5 is a parallel resonant circuit, and a resistive element R ₁ whose resistance value changes continuously depending on the magnitude of current.
, a chiyoke coil L, a capacitor C, and a fixed resistor _R2 . This parallel resonant circuit 5 is provided on the input side of a network circuit 4 made up of dividing filters 2 and 3. Therefore, for treble,
Each bass speaker SP1 and SP2 has input terminal 1.
A signal is transmitted from the network circuit 4 through a network circuit 4 including a parallel resonant circuit 5. In a speaker system having such a configuration, when the input power is small, the resistance value of the resistance element _R1 is small, and the parallel resonant circuit 5 has almost no effect. As the input power increases, the value of the resistive element _R1 increases,
The vicinity of the resonance frequency of the choke coil L and capacitor C becomes a stop band. Therefore, as shown in FIG. 5, the sound pressure level of 2KHz to 5KHz is lowered when a large sound output is performed, and the same sound quality can be obtained even if the level changes. In Figure 5, A is the sound pressure frequency characteristic when the input power is 1/16W, B is the sound pressure frequency characteristic when the input power is 1W, and C is the input power.
This is the sound pressure frequency characteristic at 16W. Here, as the resistance element _R1 whose resistance value changes continuously depending on the magnitude of the current, a positive temperature coefficient thermistor, thermistor, varistor, pilot lamp, etc. can be used.

In the above embodiment, the parallel resonant circuit 5 is provided on the input side of the network circuit 4, but this parallel resonant circuit 5 is connected to the treble speaker SP as shown in FIG.
Even if it is provided on the output side of the dividing filter 2 for the filter 1, similar effects can be obtained.

Effects of the Invention As detailed above, according to the present invention, a parallel resonant circuit having a resistance element whose resistance value changes depending on the magnitude of current is provided in the network circuit.
The Q value of the parallel resonant circuit is changed depending on the magnitude of the current flowing through the resistive element, and the reproduced sound pressure characteristics can be continuously varied according to the magnitude of input power. This has the advantage that the listener can feel the same sound quality depending on the magnitude of the output sound pressure level.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional speaker system, Figure 2 is a sound pressure frequency characteristic diagram of the speaker system, Figure 3 is a diagram showing the ISO equal loudness curve of the same speaker system, and Figure 4 is a diagram of the speaker system of the present invention. FIG. 5 is a block diagram showing one embodiment of the system, FIG. 5 is a sound pressure frequency characteristic diagram of the same speaker system, and FIG. 6 is a block diagram showing another embodiment of the speaker system of the present invention. SP1, SP2...Speaker, 1...Input terminal,
2, 3...filter, 4...network circuit,
5...Parallel resonant circuit.

Claims (1)

[Claims] 1. Connect a parallel resonant circuit consisting of a resistance element whose resistance value changes continuously depending on the magnitude of the current, a coil, a capacitor, and a fixed resistor connected in parallel between the band division filter and the input terminal, or between the band division filter and the input terminal. A speaker system installed between the speaker unit and the speaker unit.