JPH0744160Y2 - Sound field playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a sound field reproducing device incorporating a sound field generating device and an amplifier.

[Prior Art] Conventionally, a sound field generating device has been adopted in order to enhance the realism of a reproduced sound field. For example, the device 01 shown in FIG. 2 has input terminals 01L, 0 for encoded left and right channel signals.
The encoded left and right channel signals having 1R and input to the terminals 01L and 01R are input to the decoder 13, and the decoder 13 should be input to the speaker devices 18L and 18R located on the left and right in front of the listener. Outputs the front left and right channel signals, the front center channel signal to be input to the front center speaker device 18C disposed between the left and right speaker devices, and the surround signal to be input to the left and right speaker devices 18S disposed behind the listener. To do.

The outputs of the decoder are the regulators 15L, 15C,
It is input to each of the speaker devices via 15R, 15S and amplifier circuits 16L, 16C, 16R, 16S. The method is so-called "3-
It is a sound field creation method called 1 "method.

[Problems to be Solved by the Invention] In the conventional sound field reproducing apparatus as described above, only the input terminals for the encoded left and right channel signals are provided. On the other hand, in recent years, for example, high-definition television receivers and the like having the built-in sound field creation device have appeared. By the way, in the television receiver, the quality of the audio tends to be secondary because the cost of the video portion is high.

Therefore, a user who attaches great importance to sound quality requests to connect a high quality amplifier. From such an idea, it is desirable to divert the amplifier circuit part of the sound field reproducing apparatus having the decoder. In the conventional sound field reproducing apparatus, the decoder does not have the input means for the output, so that the television receiver I was unable to connect and use the machine.

[Means for Solving the Problem] The present invention takes an encoded 2-channel signal as an input signal, decodes the input signal, and outputs a front left channel signal, a front right channel signal, a front center channel signal, and a surround channel signal. In a sound field reproducing device equipped with a decoder for outputting, a controller for adjusting the level of each output signal of the decoder, and an amplifier for amplifying each output signal of the controller, a front left channel input terminal, a front right channel Input means having a channel input terminal, a front center channel input terminal, and a surround channel input terminal; and one of the output signal of the decoder and the signal supplied to the input terminal of the input means to the adjuster. A switching means for supplying the two-channel signal encoded to the input means. Signal is supplied to the adjuster by the switching means, and the front left channel signal, front right channel signal, front center channel signal, and surround are decoded by the input means. In the sound field reproducing device, when the channel signal is supplied, the switching unit supplies the signal supplied to the input unit to the adjuster.

[Operation] When a device that outputs encoded left and right channel signals is connected, the decoder output is selected, and the input encode signal is decoded into front left and right channels, front center channel, and surround channel signals, and the respective regulators are selected. Is input to the amplifier circuit via
The output drives the corresponding speaker device. On the other hand, when a device that outputs a decoded signal is connected, the signals decoded in the front left and right channels, the front center channel, and the surround channel, which are input to the input means, do not pass through the decoder but through the adjuster. It is input to the amplifier circuit and its output drives the corresponding speaker device.

[Embodiment] An embodiment of the present invention will be described below.

In FIG. 1, reference numeral 1 denotes a sound field reproducing device, which has input terminals 11L and 11R to which left and right channel signals should be input and terminals to which a decoded front center channel signal is input.
It has an input terminal 11S to which 11C and surround channel signals are to be input. When a plurality of input terminal systems are prepared, the input selector 12 selects an arbitrary input system. The left and right channel input terminals 11L and 11R are connected to the input terminals of the decoder 13 and to one ends of the switches 14L and 14R, respectively. On the other hand, the left and right front channel outputs of the decoder 13 are connected to the other ends of the switches 14L and 14R, respectively, and the switches 14L and 14R select one of the inputs.

The front center channel input terminal 11C is connected to one end of a switch 15C, and the front center channel output of the decoder 13 is connected to the other end of the switch 14C.
The switch 14C selects one of the inputs. Furthermore,
The surround channel input terminal 11S is connected to one end of the switch 14S, while the surround signal output of the decoder 13 is connected to the other end of the switch 14S, and the switch 14S selects one of the inputs.

The signals selected by the switches 14L, 14C, 14R, 14S are connected to the amplifier circuits 16L, 16C, 16R, 16S via the adjusters 15L, 15C, 15R, 15S, respectively, and the amplified output signals are The speaker devices 18L, 18C, 18R, 18S that are output to the output terminals 17L, 17C, 17R, 17S and connected to the respective terminals are driven.

Device 2 that outputs encoded left and right channel signals
When connected (indicated by a solid line in the figure), the output is connected to the left and right channel input terminals 11L and 11R. In this case, when each switch 14L, 14C, 14R, 14S is connected to the other end side (shown by the solid line in the figure), the decoder output is selected and the regulators 15L, 15C, 15R, 15S and the amplifier circuits 16L, 1
Speaker device 18L, 18C, 18R, 1 via 6C, 16R, 16S
Drive 8S.

On the other hand, when a device 3 having a decoder and having front left and right channel outputs, front center channel output, and surround channel output is connected, the front left and right channel outputs (shown by dotted lines in the figure) are connected to the left and right channel input terminals 11L and 11R, respectively. If you connect the front center channel output to the front center channel input terminal 11C and the surround channel output to the surround channel input terminal 11S, and connect the switches 14L, 14C, 14R, and 14S to one end side (shown by the dotted line in the figure), respectively. , Each signal is input to the adjusters 15L, 15C, 15R, 15S without going through the decoder, and each signal is fed through the amplifier circuits 16L, 16C, 16R, 16S to the respective speaker devices 18L, 18C, 18R, 18S. To drive.

[Advantages of the Invention] According to the sound field reproducing device described above, it is possible to connect to a device having a 2-channel encode output and a device having a "3-1" system decoding output, It has the advantage of being very versatile.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the invention, and FIG. 2 is a block diagram of a conventional sound field reproducing device.

Claims (1)

[Scope of utility model registration request] 1. A decoder that receives an encoded two-channel signal as an input signal and decodes the input signal to output a front left channel signal, a front right channel signal, a front center channel signal, and a surround channel signal, and the decoder. In a sound field reproducing device including an adjuster for adjusting the level of each output signal and an amplifier for amplifying each output signal of the adjuster, a front left channel input terminal, a front right channel input terminal, a front center channel input An input unit having a terminal and a surround channel input terminal; and a switching unit that selectively supplies either the output signal of the decoder or the signal supplied to the input terminal of the input unit to the adjuster, When the encoded two-channel signal is supplied to the input means, The output signal of the decoder is supplied to the adjuster by the switching means, and when the decoded front left channel signal, front right channel signal, front center channel signal, and surround channel signal are supplied to the input means, A sound field reproducing apparatus characterized in that the switching means supplies the signal supplied to the input means to an adjuster.