JPH0286398A - Audio signal reproducing device - Google Patents

Abstract

PURPOSE:To make a picture and a sound image coincident with each other and to reproduce a sound field with a sense of spread by providing adders mixing and adding audio L/R main signals in parallel and mixing and adding opposite channels of the audio signals L/R inputted without provision of a rear reproducing device. CONSTITUTION:The inputted audio L/R main signals subject to a multiple of alpha1 for the L signal and alpha2 for the R signal (0<=alpha1, alpha2<=1) by a attenuator 1, the result is inputted to the adders 2, and the resulting attenuated signals are mixed and added to the audio L/R main signals of the opposite channel. Thus, the sound image is located at an optional position between front speakers 4. A reverberation signal is generated by a difference component detection circuit 5 and a time delay device 6. Then the signal is mixed to one channel of the adder 2 and mixed to the other channel through a phase inverter 7. Thus, the sound image is located near a monitor TV 8 by the L/R main signals and the sound image is located by a front speaker 4 by the reverberation signal, then the sound field expansion effect of the reverberation signal is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an audio playback device for an audio/visual software playback device.

Conventional technology The development of audio-visual equipment in recent years has been remarkable, with monitor screens becoming larger and VTRs becoming more
With the shift to Fi, audio signal playback is now done using the conventional TV built-in audio playback amplifier.

Opportunities to enjoy audio and visual software such as movies at home are increasing, without using speakers, in combination with high-performance, high-output audio components.

Furthermore, the quality of audio-visual software has improved from conventional monaural recording to stereo 2ch recording and even Dolby surround recording that incorporates surround components, and we can expect further development from the software and hardware screen.

When playing audio/visual software at home, the monitor TV8. Front speakers 4 are arranged on both sides, and rear speakers 9 are arranged on the left and right rear sides of the operator.

FIG. 4 is a block diagram for reproducing the audio signal of FIG. 3. In FIG. 4, 3 is a front main power amplifier, 10 is a rear reproduction power amplifier, 5 is a differential component detection circuit, 8 is a time delay device, 4 is a front speaker, and 9 is a rear speaker. The operation of the audio signal reproducing apparatus configured as described above will be explained.

Visual signals reproduced by audio/visual reproduction devices such as laser discs and VTRs are visualized by a monitor TV 8 shown in FIG. 3, while audio signals include L and R signals as shown in FIG. 4. Via the front reproduction power amplifier 3, the signals are input to the difference component detection circuit 5 which creates the L-R components at the same time as they are reproduced by the front speakers 4, and the L-R signals are time-delayed to create a reverberation effect. The signal passes through a time delay device 6 that outputs a reverberation signal, is amplified as a reverberation signal by a power amplifier 10 for rear reproduction, and is reproduced by a rear speaker 9.

Problems to be Solved by the Invention However, with the above-described configuration and installation, a mismatch between the image and the sound image occurs, and additional equipment for rear reproduction is required. For example, when the image that is the sound source is located in the left corner of the monitor TVS, the audio signal is recorded only on the left channel as the sound source, so the front speaker 4 shown by the dashed line in Figure 3 should be installed next to the monitor TV 8. It's fine, but some discrepancies remain.

Generally, audio/visual equipment such as amplifiers and VTRs are often installed next to the monitor TV 8, and front speakers 4 are installed separately from the monitor TV 8 to create a stereo feeling when playing music software. . Furthermore, rear reproduction requires sound image localization different from that of the front speakers 4, necessitating a new rear speaker 9, and a rear reproduction power amplifier 10 to drive this.

As mentioned above, when playing the audio fist visual software,
There were problems such as unnaturalness due to the mismatch between the image and sound image and the need for additional equipment.

In view of the above problems, the present invention controls sound image localization, matches the image and sound image, and spreads the audio signal by mixing and adding the input audio signals to the opposite channels of each LR without adding rear playback equipment. To provide an audio signal reproducing device capable of reproducing a sound field with a sense of sensation.

Means for Solving the Problems To achieve this object, the audio signal reproducing apparatus of the present invention includes an attenuator that adjusts the attenuation of input audio LR main signals, an attenuator output of the opposite channel, a reverberation signal, and an input. An adder for mixing and adding the audio LR main signals is provided in parallel, and an LR whose input is the output of the adder is provided in parallel.
A power amplifier and a speaker for reproducing the respective signals are provided in series, and in order to generate the reverberant signal, a difference component detection circuit for creating L-R components, a time delay device for time delay, and one channel position of the reverberant signal are provided. It consists of a phase inverter for phase inversion.

Effects According to the present invention, by mixing the audio signal to the opposite channel with the above-described configuration, the degree of stereo separation is reduced and the sound approaches monaural sound. That is, monitor TV
Even if the front speakers are located away from the position of the attenuator, it is possible to set a virtual sound image next to the monitor TV at [i] of the attenuator. In addition, since the reverberant signal is reproduced from the actual front speaker position and is in reverse phase, it is possible to reproduce the reverberant signal with a wide spread without central sound image localization, and it is possible to match the image and sound image without adding a new rear speaker. A sense of expansion, such as surround sound, is possible.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, left and right channel audio signals (hereinafter referred to as "low signal" and "R signal") are each connected to a pair of attenuators IL,
The IR1 adders 2L, 2R and the difference component are provided to the detection circuit 5. A difference component detection circuit 5 detects the difference between these signals, and its output is given to a time delay device 6. The time delay device 6 is constituted by a BBD or the like and delays the signal for a predetermined time, and its output is given to the adder 2L and the phase inverter 7. The phase inverter 7 inverts the input phase, and the inverted output is given to the adder 2R. The adder 2L mixes and adds the L signal, the outputs of the attenuator IR, and the time delay device 6, and its output is given to the speaker 4L via the power amplifier 3L. Further, the adder 2R mixes and adds the R signal and the outputs of the attenuator IL and phase inverter 7, and its output is sent to the power amplifier 3R.
is given to speaker 4R via.

FIG. 2 is a plan view of a domestic listening room for explaining the installation method and sound image localization direction of the front speakers shown in FIG. 1.

In FIG. 2, 4 is a front speaker and 8 is a monitor TV.

The operation of the audio signal reproducing apparatus of this embodiment will be explained below.

In FIG. 1, the input audio LR main signal is
The attenuator 1 multiplies the L signal by α1 and the R signal by α2 (O≦α5.α2≦1), and inputs them to the adder 2, where they are mixed and added to audio LR main signals of opposite channels. Here, the input audio LR main signals are Lln and Rln, and the output of the adder 2 is L out.
, Rout and one reverberant signal as φ, L out: L 1n+ α2 ” Rin
■Rout= RIn+ a H* L In
■It becomes. Here, when α1=α2=1, the output is maximum stereo, and when α1=α2=1, the output is monaural. That is, it is known that in monaural mode, both the left and right front speakers 4 shown in FIG. 2 output the same signal, and the sound image is centered in front. The principle of the present invention is to use this sound image localization phenomenon, and the coefficient α5 of the attenuator 2. α2 minus α.

By adjusting α2×1, front 1 speaker 4
It is possible to localize the sound image to any position between the two. That is, as shown in FIG. 2, even if the front speakers 4 are installed at a remote position due to the monitor TV 8, the above (1)
By changing the crosstalk amount of the opposite channel shown in (2), the sound image will be localized as shown by the dashed lines on both sides of the monitor TV8, making it possible to match the image and sound image. .

Next, the reverberation signal will be explained. The reverberation signal is recorded as LR components, and is normally generated by a difference component detection circuit 5 and a time delay device 6, as shown in FIG. The generated reverberation signal is mixed into one channel of the adder 2, and after having its phase inverted through a phase inverter 7, it is mixed into another channel. If reverberant signals with mutually inverted phases are output from the front speaker 4, even if the signals are the same,
The sound image is not localized at the center, and the sound is heard from the position of the front speaker 4. That is, the LR main signal has a sound image localized near the monitor TVS, and the reverberation signal has a sound image localization at the front speaker 4 as shown by the broken line in FIG. 2, so that the sound field expansion effect of the reverberation signal can be obtained.

As described above, according to this embodiment, a reverberation effect can be obtained without adding new reverberation signal reproduction equipment, and a simple circuit configuration can achieve matching of images and sound images when playing audio/visual software. can do.

Effects of the Invention The present invention focuses on the installation state of equipment and the naturalness of images and sound images in audio/visual software playback, and by changing the amount of crosstalk of audio signals, the sound image localization can be controlled arbitrarily, and the image and sound image can be controlled as desired. This is an audio signal reproducing device that not only provides a sense of unity in the sound image, but also allows reverberation effects to be easily achieved without adding additional equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an audio signal reproducing device according to an embodiment of the present invention; FIG. 2 is a plan view of a domestic listening room illustrating the front speaker installation method and sound image localization direction of FIG. 1; FIG. 3 is a diagram illustrating a conventional audio-visual equipment installation method and sound image localization direction, and FIG. 4 is a block diagram showing the configuration of the conventional audio signal reproducing apparatus shown in FIG. 3. IL, IR...attenuator, 2L, 2R...adder, 3L, 3R...power amplifier for front reproduction, 4L
, 4R...Front speaker, 5...Difference component detection circuit, 6...Time delay device, 7...Phase inverter, 8...
・Monitor TV. 9...Rear speaker, 10...Rear power amplifier.

Claims (1)

[Claims] a pair of attenuators for L and R signals that respectively attenuate left and right channel audio signals (hereinafter referred to as L signal and R signal); a difference component detection circuit that detects a difference component between the L signal and R signal; and a difference component. a time delay device that delays the output of the detection circuit; a phase inverter that inverts the phase of the delayed output of the time delay device; the L signal and the R signal; the attenuated outputs of opposite channels of the pair of attenuators; and a pair of adders that mix and add reverberant signals whose phases are inverted to each other from the input and output ends of a phase inverter, and the outputs of each of the adders are given to left and right speakers for reproduction. Device.