JP3072051U - Digital audio system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a digital audio system, when a digital sound source has a large number of channels, settings for obtaining an optimal sound field effect are almost automatically performed, and setting work by a user himself is easy. And SOLUTION: Based on a detection signal from a human body detection sensor, a listener's listening distance to each speaker is detected (# 2), and based on the detected viewer's listening distance, a CPU is stored in a memory. The corresponding data is read out from a plurality of types of surround setting data for controlling the sound field control processing for each channel (# 3), and the signal processing in the DSP circuit is controlled. As a result, the setting for enhancing the sound field effect is performed almost automatically.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a digital audio system that reproduces audio of a plurality of channels by speakers arranged at least on the front left and right and rear left and right of a viewer.

[0002]

[Prior art]

 Conventionally, in a digital audio system of this kind, a signal from a plurality of channels of audio signal sources is processed by a signal processing (DSP) circuit based on a command signal given to a microcomputer, and the sound is output from a speaker. It is known to control the sound source localization of the sound field by using a conventional technique (see Japanese Utility Model Laid-Open No. 5-78100). There is also known a technique of detecting a position of a person in a listening room and the like and controlling a reproduced audio signal so as to maintain an optimal listening state based on the detected position (Japanese Utility Model Publication No. 5-20080). Gazette).

Meanwhile, in order to obtain an optimal sound field effect in an audiovisual (AV) device, a distance from a speaker arranged in a listening room or a display arranged in a center to a viewer (listener). Prior setting is required so that signal processing is performed according to the conditions.

[0004]

[Problems to be solved by the invention]

 However, when the digital sound source has a large number of channels, for example, a digital 5.1 channel of Dolby AC-3 (Dolby), a complicated setting operation is required. In other words, the user must individually set the distance between the listening position and the front speaker, the distance between the rear speakers, and the delay time for each channel, etc. according to the menu screen of the display and the instruction manual of the device. There was a lot of trouble. Particularly, an AV amplifier with a built-in Dolby decoder or the like requires detailed setting, and it is extremely difficult to set the setting except for a maniac.

[0005] The present invention has been made to solve the above-described problems, and when a digital sound source has a large number of channels, setting for obtaining an optimum sound field effect is performed almost automatically. It is an object of the present invention to provide a digital audio system in which setting work by a user is extremely easy.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 comprises a processing circuit for digitally processing a signal from a digital sound source, and control means for controlling the signal processing circuit. In a digital audio system that reproduces audio of a plurality of channels by speakers arranged at least on the front left and right and rear left and right of the viewer based on the output, a human body detection sensor arranged at the front center position of the viewer and this human body detection sensor Distance detecting means for detecting a listener's listening distance with respect to each speaker based on a detection signal from the user, and for each channel of a signal from a digital sound source in the signal processing circuit according to the listener's listening distance. Multiple types of surround setting data for controlling the sound field control processing of Storage means, wherein the control means reads out the surround setting data stored in the storage means based on the listening distance of the viewer detected by the distance detection means, and controls the processing by the signal processing means. Is what you do.

[0007] In the above configuration, based on the detection signal from the human body detection sensor, the listener's listening distance to each speaker is detected, and based on the detected listener's listening distance, the control means stores the listener in the storage means. The corresponding data is read out from the stored plural kinds of surround setting data for controlling the sound field control processing for each channel, and the processing by the signal processing means is controlled. As a result, the setting for enhancing the sound field effect is performed almost automatically.

[0008] According to a second aspect of the present invention, in the digital audio system according to the first aspect, the human body detection sensor includes an infrared sensor element including a pyroelectric element or a thermopile, and the sensor element focuses on the infrared sensor element. And a rotatable reflecting mirror arranged near the position, and rotating the reflecting mirror around the sensor element, and changing the distance between the sensor element and the reflecting mirror, to thereby adjust the position of the viewer. It detects the number of people.

In the above configuration, the position and the number of viewers can be detected by capturing the detection signal of the sensor element while rotating the reflection mirror, and the distance between the reflection mirror and the sensor element is changed. By capturing the detection signal of the sensor element, the distance from the front center to the viewer can be detected, and the position of the viewer can be specified.

According to a third aspect of the present invention, in the digital audio system according to the first or second aspect, the digital sound source is a DVD, and has a digital two-channel or 5.1-channel configuration. Things.

[0011] In the above-described configuration, the surround image setting with the movement of the sound image and the sense of presence is almost automatically performed, and the setting operation is simplified.

[0012]

[Embodiment of the invention]

 Hereinafter, a digital audio system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of a digital audio system. The system reproduces a digital sound source (a so-called 5.1 channel) and video recorded on a DVD. A DVD player 2 and a DVD player 2 are provided in the center of the front of a viewer (listener) 11 in a listening room 1. A display (TV) 3 for receiving a playback output of the DVD player 2 and displaying a video, and a center speaker 4 for outputting audio are arranged. In addition, front left and right speakers 5 and 6 are provided on the front left and right of the viewer 11, and rear left and right speakers 7 and 8 are provided on the rear left and right of the viewer 11, and sub woofer speakers are provided at arbitrary positions. 9 are arranged respectively.

A unit of a human body detection sensor 10 for detecting the position of the viewer 11 by infrared detection is provided on the front surface of the DVD player 2 main body. If the DVD player 2 cannot be arranged at the front center of the viewer, the sensor unit is removed and the DVD player 2 is arranged above or below the display 3.

As shown in FIG. 2, the human body detection sensor 10 includes an infrared sensor element 31 including a pyroelectric element or a thermopile capable of detecting infrared radiation emitted from a human body, and the sensor element 31 disposed near a focal position. It comprises a rotatable concave reflecting mirror 32 and a drive unit 33 for rotating the reflecting mirror 32 with respect to the sensor element 31 and moving the reflecting mirror 32 back and forth. The drive unit 33 changes the rotational force of the motor into rotation and linear motion using a rack and a pinion, and drives the reflection mirror 32 fixed to a mirror table (gear). Changing the distance between the sensor element 31 and the reflection mirror 32 based on the focal position of the reflection mirror 32, and rotating the reflection mirror 32 around the sensor element 31 to capture the detection signal of the sensor element 31 at that time. Then, the position and the number of the viewers 11 are detected, and the distance from the front center to the viewers is detected.

FIG. 3 shows the configuration of the DVD player 2. The DVD player 2 includes a DVD reproducing head 16 for optically reading a signal recorded on the DVD 15, an AD converter 17, a DSP circuit 18 for digital signal processing, a DA converter 19, an audio output circuit 20, a DSP A CPU 21 (control means) for controlling the entire player including the circuit 18, a memory 22 (storage means) storing various programs and the like, a display unit 23, a switch unit 24 and the like are provided. The user operates the switch unit 24 to give an operation command to the CPU 21 while watching the display on the display unit 23. Various commands can be given from the remote controller 25 remotely.

The CPU 21 has a function (distance detecting means) of detecting a listening distance of each of the speakers 11 of the viewer 11 based on a detection signal from the human body detection sensor 10, and a DSP circuit according to the listening distance of the viewer 11. The sound field control processing for each channel of the digital sound signal at 18 is controlled. Here, a plurality of types of surround setting data are stored in the memory 22 in advance as a data table, and the CPU 21 stores the corresponding surround setting data stored in the memory 22 based on the detected listening distance of the viewer. Read out and perform signal processing based on it.

In the data stored in the data table of the memory 22, a plurality of types according to the viewing environment such as the size of the listening room 1 and the arrangement of each speaker are prepared as a menu. At the time of the first setting of the equipment, the user shall select a type that is similar to the actual viewing environment. At the time of setting, assuming that the display 3 is in front of the viewer, the distance between the front left and right speakers 5 and 6 relative to the display 3 and the distance from the display 3 to the rear left and right speakers 7 and 8 are set. Information may be input to the device.

As the surround setting data, among the types selected in accordance with the user's viewing environment, data corresponding to the position (distance) of the viewer 11 detected by the human body detection sensor 10 is used. This data includes data for controlling the sound pressure level, signal delay time, and the like for each channel. The CPU 21 controls the signal processing by the DSP circuit 18 using this data, so that the processing most suitable for the viewing environment can be performed, and the sound field effect can be enhanced. Then, such control is performed almost automatically.

FIG. 4 shows a processing procedure by the CPU 21. First, a type corresponding to the viewing environment is selected from the initial menu (# 1). Next, the position of the viewer 11 is detected by the human body detection sensor 10 (# 2), and the viewing / listening detected with reference to the data table is performed. Surround setting data according to the position of the user 11 is automatically set (# 3) and played back using this data (# 4). In the case of 2 channels, the 3D effect is effective, and in the case of 5.1 channels, the control of the delay time of the rear speaker is effective. In this way, surround settings such as Dolby Pro Logic and Dolby Digital are almost automatically performed, so that with a simple setting operation, it is possible to enjoy a sound image movement and a realistic sound field effect.

The present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, in the above embodiment, the DVD player has been described, but the digital sound source may be a sound source such as a digital broadcast wave.

[0021]

[Effect of the invention]

 As described above, according to the present invention, since the location of the viewer can be specified, the corresponding data is read out from the data for signal processing stored in advance in the storage means, and is automatically used by using the data. The sound field can be controlled. For this reason, surround settings such as Dolby Pro Logic and Dolby Digital can be automatically and easily performed, and there is no need for the user to perform cumbersome setting work, and the user can enjoy audio reproduction.

Also, the human body detection sensor is an infrared sensor, and a reflection mirror is rotated with respect to the sensor element, and a distance between the sensor element and the reflection mirror is changed to capture a detection signal of the sensor element. The location and number of viewers and the distance from the front center can be easily detected and specified.

The digital sound source is a DVD, and digital 2 channels or 5. By having a one-channel configuration, the optimal surround setting is made almost automatically, and it is possible to enjoy a high quality sound image movement and a reproduction output with a sense of presence.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a digital audio system according to an embodiment of the present invention.

FIG. 2A is a longitudinal sectional view of a human body detection sensor used in the system, and FIG.

FIG. 3 is a block diagram of a DVD player of the system.

FIG. 4 is a flowchart of a process performed by a CPU of the DVD player.

[Explanation of symbols]

 2 DVD player 3 Display 4 Center speaker 5, 6 Front left / right speaker 7, 8 Rear left / right speaker 9 Sub woofer speaker 10 Human body detection sensor 11 Viewer 18 DSP circuit (signal processing circuit) 21 CPU (control means, Distance detecting means) 22 memory (storage means) 31 infrared sensor element 32 reflection mirror

Claims (3)

[Utility model registration claims] 1. A processing circuit for digitally processing a signal from a digital sound source, and control means for controlling the signal processing circuit, wherein at least front left and right and rear left and right of a viewer are based on an output of the signal processing circuit. In a digital audio system that reproduces audio of a plurality of channels by speakers arranged in a human body, a human body detection sensor arranged at a front center position of a viewer, and a listener listening to each speaker based on a detection signal from the human body detection sensor. Distance detection means for detecting a distance, and a plurality of types of surround setting data for controlling a sound field control process for each channel of a signal from a digital sound source in the signal processing circuit in accordance with a listening distance of a viewer are stored in advance. Storage means, wherein the control means is Digital Audio System, characterized in that based on the listening distance of the detected viewer by the distance detecting means reads the surround setting data stored in the storage means, for controlling the processing in the signal processing means. 2. The human body detection sensor comprises an infrared sensor element including a pyroelectric element or a thermopile, and a rotatable reflecting mirror in which the sensor element is disposed near a focal position, and reflects light around the sensor element. The digital audio system according to claim 1, wherein the position and the number of viewers are detected by rotating a mirror and changing a distance between the sensor element and the reflection mirror. 3. The digital sound source is a DVD,
The digital audio system according to claim 1, wherein the digital audio system has a digital two-channel or 5.1-channel configuration.