JPH04112599U - sound reproduction device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a sound reproduction device that eliminates the need for a dedicated deep bass amplifier and deep bass signal reproduction speaker, and which can provide almost the same sense of presence as a conventional 3D sound reproduction device. [Configuration] A filter 1L that divides the left channel audio frequency signal into a low-cut signal and a high-cut signal, a filter 1R that divides the right-channel audio frequency signal into a low-cut signal and a high-cut signal, and a filter that receives and amplifies both high-cut signals. a bass enhancement circuit consisting of a signal adder 4 and a voltage amplifier 7 that generates one high-cut signal, a left channel power amplifier 2L that amplifies the enhanced high-cut signal and the left channel low-cut signal; It is equipped with a right channel power amplifier 2R that amplifies the high cut signal and the right channel low cut signal.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses acoustic signals obtained from magnetic tapes, compact discs (CDs), etc. Or, it relates to an audio reproduction device that reproduces an audio signal obtained by a receiving device, and in particular, A sound reproduction device that provides a sense of presence equivalent to the 3-Dimension (3D) method. related.

0002

[Conventional technology]

Conventionally, in home audio equipment, in-vehicle audio equipment, etc., for example, As a sound reproduction device that reproduces deep bass sounds, those that use the 3D method are widely known. It is being

0003 Figure 2 shows a conventional sound reproduction device that adopts this 3D method. R is the left channel and right channel filter, 2L, 2R, 2C are the left channel and right channel. Channel and heavy bass power amplifier, 3L, 3R, 3C are left, right, and deep bass power amplifiers. A speaker for reproducing sound signals, and 4 a signal adder.

0004 The left channel and right channel filters 1L and 1R respectively have input audio frequencies. For example, the wave number signal is divided into a low frequency signal component (deep bass signal component) of 100 Hz or less and the corresponding It acts to divide the high-frequency signal component into a left channel and a right channel. , and deep bass power amplifiers 2L, 2R, and 2C each receive input audio frequency signals. Speakers 3L, 3R, and 3 for power amplifying the signal and reproducing left, right, and deep bass signals. C emits a power-amplified audio frequency signal. Also, believe The signal adder 4 receives the low frequency signal components from the left channel and right channel filters 1L and 1R. It is used for mixing.

[0005] This conventional sound reproduction device operates as described below.

[0006] The left channel audio frequency signal, for example a music signal, supplied to terminal 5L is In the channel filter 1L, low frequency signal components below 100 Hz (heavy bass signal components, Hereinafter, this is referred to as a high-cut signal) and high-frequency signal components above the relevant frequency (hereinafter, referred to as high-cut signal) This signal is called a low-cut signal), and the low-cut signal is the left channel signal. After the power is amplified by the channel power amplifier 2L, it is supplied to the left signal reproduction speaker 3L. and is emitted as a left signal from the speaker 3L. Meanwhile, the left channel The high-cut signal obtained by the filter 1L is supplied to one input of the signal adder 4. Ru.

[0007] Also, a right channel audio frequency signal, for example a music signal, supplied to the terminal 5R. Similarly to the left channel, the right channel filter 1R has a low frequency signal of 100Hz or less. signal component (high-cut signal) and high-frequency signal component above the relevant frequency (low-cut signal) The low-cut signal therein is power amplified by the right channel power amplifier 2R. After that, the signal is supplied to the right signal reproduction speaker 3R, and the signal is output to the right speaker 3R. while the high-frequency sound obtained by the right channel filter 1R is emitted as a right-side signal. The signal is supplied to the other input of the signal adder 4.

[0008] The high-cut signal mixed by the signal adder 4 is then amplified with heavy bass power. After the power is amplified by the device 2C, the deep bass signal is output to the central deep bass signal reproduction speaker 3C. It is emitted as a signal.

[0009]

[Problem that the idea aims to solve]

The conventional sound reproduction device mentioned above uses a dedicated deep bass amplifier 2C or a dedicated deep bass amplifier. It requires a signal reproduction speaker 3C, and also requires a deep bass amplifier 2C and a deep bass signal. Since the number reproduction speaker 3C has a special configuration, it reproduces heavy bass faithfully. If you try to do that, the problem is that it will become very expensive.

0010 Also, when trying to use the conventional sound reproduction device mentioned above for in-vehicle use, Securing the mounting position of the speakers, especially the installation of the center deep bass signal reproduction speaker 3C The problem is that it is difficult to secure a location.

[0011] This invention was devised to solve these problems, and is a special In addition to eliminating the sound amplifier and deep bass signal reproduction speaker, the conventional 3D method of sound reproduction is To provide a sound reproduction device that can provide almost the same auditory sensation (sense of presence) as a live device. The purpose is to

0012

[Means to solve the problem]

To achieve the above object, the present invention low-cuts the left channel audio frequency signal. A filter that splits the right channel audio frequency signal into a high-cut signal and a low-cut signal. A filter that divides the signal into a cut signal and a high-cut signal, and a filter that receives both high-cut signals. A bass enhancement circuit that generates one enhanced high-cut signal and an enhanced high-cut signal. a left channel power amplifier that amplifies the left channel low cut signal and the left channel low cut signal; Right channel power that amplifies the high cut signal and the right channel low cut signal It is equipped with an amplifier.

[0013] Further, the bass enhancement circuit preferably includes a signal processor that adds both high-cut signals. It consists of a calculator and a voltage amplifier that amplifies its output.

[0014]

[Effect]

The high-cut signal divided by the left channel filter and right channel filter is , for example, a signal adder that adds both high-cut signals and a voltage that amplifies its output. This enhanced high cut is sufficiently enhanced by a bass enhancement circuit consisting of an amplifier. The signal is added to the left and right low-cut signals, respectively, and the corresponding power amplification is performed. Since the output signals of both power amplifiers are at the level of the low-cut signal, The level of the high-cut signal is higher than that, and the sound is emitted from both left and right speakers. The sound becomes one in which the high-cut signal component (deep bass component) is enhanced.

[0015] Since the high-cut signal component (heavy bass component) has no directivity, the left The high-cut signal components (heavy bass components) emitted from both right speakers are The sound is emitted from the center of the speaker, that is, there is a deep bass signal reproduction speaker in the center. In the end, it is almost the same as a sound reproduction device that uses the conventional 3D method. The same auditory sensation (sense of presence) can be obtained.

[0016]

【Example】

Embodiments of the present invention will be described with reference to the drawings.

[0017] FIG. 1 is a block diagram showing one embodiment of a sound reproduction device according to the present invention. In the figure, 1L and 1R are left channel and right channel filters, 2L and 2R are Left channel and right channel power amplifier, 3L, 3R for left and right signal regeneration Full-band speaker, 4 is signal adder, 5L, 5R are left channel and right channel audible Frequency signal input terminals, 6L and 6R are left channel and right channel signal adders, 7 is It is a voltage amplifier, and the signal adder 4 and voltage amplifier 7 constitute a bass enhancement circuit. It is. In addition, in this example, the same components as the conventional sound reproduction device are used. Equivalent components are given the same reference numerals.

[0018] Similarly to the conventional sound reproduction device, the left channel and right channel filters 1 L and 1R each represent an input audio frequency signal, for example, a low frequency signal of 100Hz or less. component (heavy bass signal component, i.e., high-cut signal) and high-frequency signal component above the relevant frequency. (low-cut signal). Power amplifiers 2L and 2R power amplify the input audio frequency signals, respectively, and The signal reproducing speakers 3L and 3R are powered by the corresponding power amplifiers 2L and 2R, respectively. The signal adder 4 is used to emit an audible frequency signal that has been amplified by power, and the signal adder 4 is connected to the left channel. mixes the high-cut signals from the left and right channel filters 1L and 1R. Works like a sea urchin. In addition, the voltage amplifier 7 voltage amplifies the mixed high-cut signal. , left channel and right channel signal adders 6L and 6R are left channel low-cut signals. and the voltage amplified high-cut signal and the right channel low-cut signal and the voltage amplified high-cut signal. and high-cut signals, and supply it to the corresponding power amplifiers 2L and 2R. work as if

[0019] The device of the above embodiment operates as follows.

[0020] The left channel audio frequency signal, for example a music signal, supplied to terminal 5L is High-cut signals below 100Hz and above the relevant frequency in channel filter 1L The low-cut signal is divided into two low-cut signals, and the low-cut signal is directly connected to the left channel signal. It is supplied to an adder 6L. Similarly, the right channel supplied to terminal 5R An audio frequency signal, for example a music signal, is also applied to the right channel filter 1R. Divided into a high-cut signal below 0Hz and a low-cut signal above the frequency, The low-cut signal therein is directly supplied to the right channel signal adder 6R.

[0021] On the other hand, the high-cut signal obtained by the left channel filter 1L and the right channel filter The high-cut signal obtained from the Router 1R is a low-frequency sound that is a feature of this invention. Supplied to the boost circuit. In this bass enhancement circuit, the two high-cut signals The signal is first mixed in the signal adder 4, and then this mixed signal is mixed in the signal adder 4. The voltage amplifier 7 amplifies the voltage of the ikat signal to an appropriate level and strengthens it. It is output from the bass enhancement circuit as a high-cut signal.

[0022] This enhanced high-cut signal is then added to the left channel and right channel signals. left channel and right channel signal adders 6L, 6R. left channel low-cut signal, enhanced high-cut signal, and right channel, respectively. Mixing of the Nerlow cut signal and the enhanced high cut signal is performed. difference Furthermore, the mixing signal of the left channel low-cut signal and the enhanced high-cut signal is The signal is power amplified by the left channel power amplifier 2L, and the power amplified signal is is supplied to the full-band speaker 3L for signal reproduction, and the left side of the speaker 3L is It is emitted as a signal. Also, similar to this, the right channel low-cut signal and reinforcement The power of the mixed signal with the high cut signal is increased by the right channel power amplifier 2R. The power amplified signal is supplied to the right full-band speaker 3R for signal reproduction. The signal is then emitted from the speaker 3R as a right-side signal.

[0023] In this case, in this embodiment, the high-cut signals of the left channel and right channel are increased. Equipped with a bass boosting circuit that enhances the low frequency of the left and right channels. Compared to the signal level, the high-cut signal level of the left channel and right channel is For example, it becomes about 6 to 10 db louder, and full-band speakers 3L and 3R for both signal reproduction. The sound signal emitted from the system has deep bass components sufficiently enhanced.

[0024] Since this deep bass component has no directivity, the entire band width for both signal reproduction is The deep bass components emitted from the speakers 3L and 3R are exactly the same as those of the two speakers 3L and 3R. The voice is emitted from the center, and the reinforcement of the deep bass component makes it possible to hear both speakers. -It seems like there is a deep bass signal reproduction speaker in the center of cars 3L and 3R. The auditory sensation (sense of presence) obtained at this time is the same as the sound using the conventional 3D method. It is equivalent to a sound reproduction device.

[0025] In the above embodiment, the left channel and right channel filters 1L and 1R obtain Although the explanation was given assuming that the frequency of the high-cut signal is 100Hz or less, The frequency is not limited to this, but may be other frequencies, such as 200 to 2 It can be selected to be 50Hz or less.

[0026] Further, in the embodiment, the bass enhancement circuit includes the signal adder 4 and the voltage amplifier 7. Although we have explained that the bass enhancement circuit is constructed from Rather, it mixes and amplifies the left channel and right channel high-cut signals. If so, other configurations may be adopted.

[0027] Furthermore, instead of the voltage amplifier 7 having a fixed gain, a voltage amplifier having a variable gain may be used. Using the device 7, the enhancement level of the high-cut signal can be adjusted according to the user's preference. You can do it like this.

[0028]

[Effect of the idea]

As explained above, the present invention provides high-cut signals of the left channel and right channel. Since it is equipped with a bass enhancement circuit that enhances the left and right channel local The level of the high-cut signal of the left channel and right channel compared to the level of the high-cut signal. The signal becomes quite large, and the sound is emitted from full-band speakers 3L and 3R for both signal reproduction. The sound signal becomes one in which deep bass components are sufficiently enhanced. Therefore, for both signal reproduction There is a deep bass signal reproduction speaker in the center of the band speakers 3L and 3R, and from there It feels like a deep bass component is being emitted, and the auditory sensation (realistic) that you get at this time is The sense of place) is the same as that of a conventional 3D sound reproduction device, so as a result, Expensive heavy bass power amplifiers and heavy bass required by conventional 3D sound reproduction equipment The signal reproduction speaker can be omitted, and the production cost will be reduced accordingly. Moreover, the space factor can be improved.

[0029] In addition, the full-band speakers 3L and 3R for both signal reproduction used in this invention are different from conventional ones. You can use the same speakers as those used in the sound reproduction device, so in this respect as well, the cost is It will not lead to a store stop.

[0030] Furthermore, when the sound reproduction device of the present invention is used in a car, it is possible to reproduce deep bass signals in the center. Since there is no need to place live speakers, it is difficult to secure the mounting position for the speakers. This allows the device to be effectively placed inside the vehicle without any effort.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing one embodiment of a sound reproduction device of the present invention.

FIG. 2 is a block configuration diagram showing a conventional 3D sound reproduction device.

[Explanation of symbols]

1L left channel filter 1R right channel filter 2L left channel power amplifier 2R right channel power amplifier 2C deep bass power amplifier 3L Left signal reproduction speaker 3R Right signal reproduction speaker 3C speaker for deep bass signal reproduction 4 Signal adder 5L Left channel audio frequency signal input terminal 5R Right channel audio frequency signal input terminal 6L left channel signal adder 6R right channel signal adder 7 Voltage amplifier

Claims (1)

[Scope of utility model registration request] 1. A filter that divides a left channel audio frequency signal into a low-cut signal and a high-cut signal, a filter that divides a right-channel audio frequency signal into a low-cut signal and a high-cut signal, and a filter that receives and amplifies both high-cut signals. a bass enhancement circuit that generates one high-cut signal;
Sound reproduction characterized by comprising: a left channel power amplifier that amplifies the enhanced high cut signal and the left channel low cut signal; and a right channel power amplifier that amplifies the enhanced high cut signal and the right channel low cut signal. Device.