JPH0775437B2 - 3 dimensional playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel three-dimensional reproduction apparatus, and in particular, a new compact, low-cost three-dimensional reproduction capable of reproduction by the three-dimensional system without increasing the number of parts. It is intended to provide a reproducing device.

BACKGROUND ART Stereophonic reproduction has become more important in television receivers since the start of audio multiplex television broadcasting. In the stereo reproduction, it is very important to sufficiently enhance the low frequency reproduction ability. Then, as one of the methods for enhancing the low frequency reproduction capability, there is a three-dimensional reproduction method in which a center channel speaker dedicated to low frequency reproduction is provided in addition to the left channel speaker and the right channel speaker. By the way, conventional general 3
The dimensional reproduction apparatus is as shown in FIG. This is provided with two demultiplexers a and b corresponding to the two left and right channels, and the signals of the middle and high frequency components output from the two demultiplexers a and b are output to the left and right channels. Amplification is performed by the amplifiers c and d provided corresponding to, and the output signals of the amplifiers c and d are applied to the speakers e and f. And the mixing circuit g
By taking out only the low frequency component (for example, the frequency component of 150 Hz or less) that does not affect the sound image localization from the left and right two-channel audio signals, and mixing the low frequency audio signals of the two channels, the mixing circuit g Is applied to the center channel speaker i.

By the way, the reproducing apparatus of the three-dimension system as shown in FIG. 1 has two demultiplexers a in addition to the amplifiers c and d corresponding to the left and right channels and the speakers e and f and the speaker i of the center channel. b, a mixing circuit g and an amplifier h for the center channel are required. Therefore, there is a problem that the reproducing device becomes very expensive and becomes large in size.

Also, as a three-dimensional type reproducing apparatus, there is an apparatus using an LC network j as shown in FIG. Such a reproducing apparatus does not require an amplifier for the center channel, but the LC network j used in place of the two demultiplexers and one mixing circuit is expensive and large in size,
The problems of high price and large size cannot be solved. This is because when reproducing by the three-dimensional system only with the LC network j without using the center channel amplifier, the LC network j has a large inductance because the crossover frequency is very low at 150 Hz or less.
Moreover, the coil L having a large current capacity must be used. Therefore, the LC network j becomes expensive and large in size, and the high price and large size directly lead to the high price and large size of the television receiver.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a novel 3-dimensional reproducing apparatus which is small in size and low in cost and which can be reproduced by the 3-dimensional system without increasing the number of parts.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the third dimension reproducing apparatus of the present invention is configured such that the output terminal of the first polarity of the amplifier for the left channel is connected to the terminal of the first polarity of the speaker for middle- and high-range left channels, and the output terminal of the speaker is connected. The terminal of the second polarity is connected to the output terminal of the second polarity of the amplifier for the left channel via the capacitor for bypassing the middle and high range components, and the output terminal of the first polarity of the amplifier for the right channel is connected to the middle and high range of the right channel. A second polarity terminal of the speaker, and a second polarity terminal of the speaker is connected to a second polarity output terminal of the right channel amplifier via the mid-high range component bypass capacitor, The left and right common low-frequency speakers are connected in series to both the left-channel mid-high range speaker and the right-channel mid-high range speaker, and the mid-high range component bar. Embodiment 1 is characterized in that it is connected in parallel to the capacitors for the bypass, and the third embodiment of the present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

FIG. 3 shows an example of implementation of the third dimension reproducing apparatus of the present invention. In the figure, 1 is an amplifier for amplifying the left channel audio signal Sl, and 2 is a right channel audio signal.
In the amplifier for amplifying Sr, the negative side (common side) terminals of the outputs of the two amplifiers 1 and 2 are connected to each other. Reference numeral 3 is a speaker for reproducing the middle and high tones of the left channel, and 4 is a speaker for reproducing the middle and high tones of the right channel, both of which have the characteristic of reproducing the middle and high tones as shown by line a in FIG. ing. The minus side (common side) terminals of the two speakers 3 and 4 are connected to each other. The positive side terminal of the left channel speaker 3 and the positive side terminal of the output of the left channel amplifier 1 are connected to each other, and the positive side terminal of the right channel speaker 4 and the output of the right channel amplifier 2 are connected. The positive terminal is connected to each other.

Reference numeral 5 denotes a bass speaker 5, which is arranged in the center between the two speakers 3 and 4 and has a characteristic of reproducing a bass sound as shown by a line b in FIG. . The bass speaker 5 is connected between the mutually connected negative side (common side) terminals of the speaker 3 and the speaker 4 and the mutually connected negative side (common side) terminals of the amplifier 1 and the amplifier 2. Has been done. Reference numeral 6 denotes a capacitor for bypassing the middle and high range components, which is connected in parallel with the bass speaker 5. The capacity of this capacitor 6 is, for example, 150 μF,
And it must be of the bipolar type.

In this three-dimensional reproduction device, middle and high frequency components of the audio signals output from the two amplifiers 1 and 2 pass through the speakers 3 and 4 and are reproduced by the speakers 3 and 4, but are bypassed by the capacitor 6. Therefore, no voltage is applied to the bass speaker 5. On the other hand, the bass component of the audio signal cannot pass through the capacitor 6 because the reactance of the bypass capacitor 6 for it becomes high. Therefore, the bass component voltage can be applied to the bass speaker 5, and the bass component of the audio signal is reproduced by the bass speaker 5.

Embodiment 2 FIG. 5 shows another embodiment of the third dimension reproducing apparatus of the present invention. In this embodiment, an impedance correction circuit is added to the three-dimensional reproduction device shown in FIG. Reference numeral 7 denotes an impedance correction circuit, which is a left-channel correction unit 7l in which a resistor R, a capacitor C, and a coil L are connected in series, and a right-channel correction unit 7l in which a resistor R, capacitor C, and a coil L are also connected in series. The left channel correction unit 7l is connected in parallel to the left channel speaker 3, and the right channel correction unit 7r is connected in parallel to the right channel speaker 4.

The reason why the impedance correction circuit 7 is provided in this way is as follows. That is, since a resonance circuit is inevitably formed on the output side of the amplifier 1 for the left channel and the amplifier 2 for the right channel, as shown by the solid line in FIG. 6 in the vicinity of the resonance frequency f _{0 of the} resonance circuit. The phenomenon that the impedance of the high-pitched loudspeakers 3 and 4 rises occurs. Therefore, the magnitude of the signal in the vicinity of the resonance frequency f ₀ applied to the bass speaker 5 is reduced, and the power input to the bass speaker 5 is reduced. With this, preferable reproduction cannot be performed.

Therefore, the correction circuit 7 including the correction units 7l and 7r having the frequency characteristics shown by the broken line in FIG. 6 is provided, and the impedances of the speakers 3 and 4 viewed from the amplifiers 1 and 2 are shown by the dashed line in FIG. As described above, it is made flat even near the resonance frequency f ₀ . By doing so, the size of the audio signal in the vicinity of the resonance frequency f ₀ applied to the bass speaker 5 can be made sufficiently large.

EFFECTS OF THE INVENTION As described above, in the third dimension reproducing apparatus of the present invention, the first polarity output terminal of the left channel amplifier is connected to the first polarity terminal of the left channel mid-high range speaker, The second-polarity terminal of the speaker is connected to the second-polarity output terminal of the left-channel amplifier through the mid-high range component bypass capacitor, and the first-polarity output terminal of the right-channel amplifier is connected to the right. It is connected to the first polarity terminal of the channel mid-high range speaker, and the second polarity terminal of the speaker is connected to the second polarity output terminal of the right channel amplifier through the mid-high range component bypass capacitor. The left and right common low-frequency speakers are connected in series to both the left-channel mid-high range speaker and the right-channel mid-high range speaker, and the mid-high range component bypass is connected. Therefore, according to the present invention, the mid-high range component of the audio signal to be added to the bass speaker can be bypassed by the mid-high range bypass capacitor. it can. Therefore, it is possible to add only the low frequency component of the audio signal to the low frequency speaker by simply providing a mid / high frequency bypass capacitor, and a small size that can be reproduced by the three-dimension method without increasing the number of parts unnecessarily. It is possible to provide a low-priced novel three-dimensional playback device.

Application Example Needless to say, the present invention can be applied not only to the three-dimensional reproduction device for reproducing the sound of the television broadcast but also to the three-dimensional reproduction device for audio.

[Brief description of drawings]

1 and 2 are circuit diagrams showing other conventional examples, FIG. 3 is a circuit diagram showing an example of implementation of a three-dimensional reproduction apparatus of the present invention, and FIG. 4 is used in the circuit shown in FIG. FIG. 5 is a frequency characteristic diagram of the speaker, FIG. 5 is a circuit diagram showing another embodiment of the third dimension reproducing apparatus of the present invention, and FIG. 6 is a diagram showing a change in impedance depending on the frequency on the speaker side for middle and high frequencies viewed from the amplifier. . Explanation of symbols 1, 2 ... Amplifier, 3 ... Bass speaker, 4, 5 ...
Mid-high range speaker, 6 ... Mid-high range bypass capacitor

Claims (1)

[Claims] 1. A first-polarity output terminal of a left-channel amplifier is connected to a first-polarity terminal of a left-channel mid-high range speaker, and a second-polarity terminal of the speaker is used for mid-high range component bypass. Connect it to the second polarity output terminal of the left channel amplifier through a capacitor, and connect the first polarity output terminal of the right channel amplifier to the first polarity terminal of the right channel mid-high range speaker. ,
The second polarity terminal of the speaker is connected to the second polarity output terminal of the right channel amplifier via the mid-high range component bypass capacitor, and the left and right common bass speaker is connected to the left channel. A three-dimensional playback device characterized in that it is connected in series to both the mid-high range speaker and the mid-high range speaker for the right channel, and in parallel to the mid-high range component bypass capacitor.