JP2016208285A - Wireless voice transmission system and source equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless voice transmission system and source equipment for quickly forming the optimal acoustic field even when a listener moves.SOLUTION: A wireless voice transmission system includes: a plurality of speaker equipment 2; source equipment 1 for transmitting a voice signal to each speaker equipment through wireless communication; and terminal equipment 3. Each speaker equipment is able to receive a wireless signal from the terminal equipment, and transmits information on wireless communication between the terminal equipment and its own speaker equipment to the source equipment. The source equipment includes: a position estimation part 10a for estimating the position of terminal equipment from the information on the wireless communication; a signal processing part 14 for determining a voice signal or a voice signal processing parameter to be output to each speaker equipment in accordance with a distance between the terminal equipment whose position is estimated by the position estimation part and each speaker equipment; and a signal transmission part 15 for transmitting the determined voice signal or voice signal processing parameter to each speaker equipment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an audio radio transmission system and a source device, and more specifically, an audio radio including a plurality of speaker devices, a source device that transmits an audio signal to each speaker device by radio communication, and a terminal device. The present invention relates to a transmission system and a source device.

  The sound reproduction system includes a stereo (2ch) system and a 5.1ch surround system, and speaker devices are respectively arranged on a circumference centering on a listener. In addition, a sound image intended by the producer can be obtained at a listening position equidistant from each speaker device, that is, a so-called sweet spot. For example, Patent Document 1 discloses a technique in which the sound volume from each speaker device is measured with a microphone provided at a reference position, and the optimum sound field is changed by changing the sound volume from each speaker device based on the measurement result. It is disclosed.

Patent Document 2 discloses a technique for detecting the position of a listener and changing the phase of the sound from each speaker device based on the detection result to make the position of the listener an optimal sound field. ing.
On the other hand, in recent years, devices that utilize wireless communication have increased in AV (Audio Visual) devices, and a speaker device and a source device such as a player or an amplifier are connected wirelessly, and the audio is WiFi (registered trademark, the same applies hereinafter). , ZigBee (registered trademark), Bluetooth (registered trademark, the same applies hereinafter), Wireless Speaker and Audio (WiSA; registered trademark, the same applies hereinafter), and the like.

Special table 2003-516687 gazette JP 2009-27603 A

  However, in a conventional system for transmitting audio signals from a source device to a plurality of speaker devices by wireless communication, even if an attempt is made to form an optimal sound field by applying the techniques described in Patent Literatures 1 and 2, 1 requires a test signal for detecting the position of the microphone, and Patent Document 2 requires both a test signal for detecting the position of the listener. In other words, it is difficult to create a sound field while listening, and when the listener moves, the position of the listener must be detected using a test signal each time the listener moves, and the optimal sound There is a problem that a place cannot be formed quickly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a voice radio transmission system and a source device that quickly form an optimal sound field even when a listener moves.

  In order to solve the above-described problem, a first technical means of the present invention is a sound including a plurality of speaker devices, a source device that transmits a sound signal to each speaker device by wireless communication, and a terminal device. In the wireless transmission system, each of the speaker devices can receive a wireless signal from the terminal device, and transmits information related to wireless communication between the terminal device and its own speaker device to the source device, and the source device The device includes a position estimation unit that estimates a position of the terminal device from information related to the wireless communication, and each speaker device according to a distance between the terminal device that has estimated the position by the position estimation unit and each speaker device. A signal processing unit for determining a sound signal or a sound signal processing parameter to be output to the sound signal, and the determined sound signal or the sound signal processing parameter for each It is obtained by; and a signal transmission unit for transmitting to the serial speaker device.

  According to a second technical means, in the first technical means, the speaker device transmits information related to the wireless communication to the source device by wireless communication.

  According to a third technical means, in the first or second technical means, the information on the wireless communication is wireless communication time information based on a transmission time of a radio wave from the terminal device to the speaker device, and the source device Calculating the distance between the terminal device and each speaker device from the wireless communication time information, and estimating the position of the terminal device from the calculated distance between the terminal device and each speaker device, It is a thing.

  According to a fourth technical means, in any one of the first to third technical means, the audio signal transmitted from the source device is an uncompressed signal.

  According to a fifth technical means, in any one of the first to fourth technical means, the source device has a position estimated by the position estimation unit according to a distance between the terminal device and each speaker device. The combination of the speaker devices is changed.

  The sixth technical means is a source device that transmits an audio signal to a plurality of speaker devices by wireless communication, and transmits information related to wireless communication between the terminal device and the speaker device transmitted from each of the speaker devices. According to the information receiving unit to receive, the position estimating unit for estimating the position of the terminal device from the received information on the wireless communication, and the distance between the terminal device and the speaker device whose position is estimated by the position estimating unit A signal processing unit for determining an audio signal to be output to each speaker device or an audio signal processing parameter, and transmitting the determined audio signal or the audio signal processing parameter to each of the speaker devices. And a signal transmission unit.

  Advantageous Effects of Invention According to the present invention, in a voice wireless transmission system for transmitting voice signals from a source device to a plurality of speaker devices by wireless communication, the position of the terminal device can be estimated in real time from information related to wireless communication between the terminal device and each speaker device. Therefore, an optimal sound field can be quickly formed even if the terminal device moves. Moreover, if the audio signal is corrected and output by each speaker device based on the audio signal processing parameter, the burden on the source device can be reduced.

It is a block diagram which shows the example of 1 structure of the audio | voice radio | wireless transmission system by this invention. It is a schematic diagram which shows an example of arrangement | positioning of each speaker apparatus. It is a sequence diagram for demonstrating the sound field control by 1st Embodiment. It is a schematic diagram which shows the position of a terminal device and each speaker apparatus. It is a figure for demonstrating the content of instruction | indication from a source device to a speaker apparatus. It is a schematic diagram which shows an example of sound field control. It is a schematic diagram which shows the other example of sound field control. It is a sequence diagram for demonstrating the sound field control by 2nd Embodiment.

  The audio wireless transmission system according to the present invention is a system including a speaker device and a source device, and is also called a wireless audio system, a wireless speaker system, or the like. As will be described later, this source device incorporates a wireless communication unit for transmitting an audio signal to the speaker device by wireless communication. However, this wireless communication unit may be provided in a separate housing.

  The source device includes various audio playback devices such as a CD (Compact Disc) player, an SACD (Super Audio CD) player, a BD (Blu-ray Disc; registered trademark) player, an HDD (Hard Disk Drive) player, and a television set. Apparatus, PC (Personal Computer), and the like. The audio player also includes a network player that receives a music file stored in a server via a network and wirelessly transmits it to a speaker device. Also, any of the source devices may incorporate some speaker devices. For example, a center speaker is provided in the casing of the television apparatus (note that this center speaker transmits various data by wire), and speakers for other channels are arranged in a separate casing. Hereinafter, a voice radio transmission system according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of a voice radio transmission system (hereinafter, this system) according to the present invention.
This system includes a plurality of speaker devices 2, a source device 1 that transmits an audio signal to each speaker device 2 by wireless communication, and a terminal device 3 such as a tablet, a smartphone, or a portable information terminal. In FIG. 1, only one of the plurality of speaker devices 2 is illustrated, but the source device 1 and the speaker device 2 are provided in a one-to-many relationship.

The source device 1 is a wireless transmitter including a control unit 10 that controls the entire device and a wireless communication unit 15. The wireless communication unit 15 of the source device 1 corresponds to the information receiving unit or signal transmitting unit of the present invention.
The control unit 10 is configured by, for example, a CPU (Central Processing Unit) or the like, and as described later, position estimation that estimates the position of the terminal device 3 from information related to wireless communication between the terminal device 3 and each speaker device 2. It functions as the unit 10a.

  In addition, the source device 1 includes, for example, an audio input unit for inputting audio content (audio signal) to be output. As an example of the voice input unit, an example in which the voice input terminal 11, the communication unit 12, and the voice input processing unit 13 are provided is given, but one of the voice input terminal 11 or the communication unit 12 may be provided. In addition, the source device 1 may be provided with a storage device that stores the audio content, and an audio playback unit that reads the audio content from the storage device and performs playback processing.

As the audio input terminal 11, input terminals of various standards such as a High-Definition Multimedia Interface (HDMI; registered trademark) terminal can be applied.
The communication unit 12 can receive audio content by communicating with the outside based on standards such as LAN (Local Area Network), WiFi, Bluetooth, etc., regardless of wired or wireless. For example, Internet radio broadcasts can be received using the communication unit 12. Of course, both the communication unit 12 and the wireless communication unit 15 can use the same standard, such as adopting the WiFi standard, but in that case, in order to avoid interference between reception and transmission of the audio signal, the MAC (Media Access Control address) Different identifiers such as addresses.

  The audio input processing unit 13 can convert an audio signal input from the audio input terminal 11 or the communication unit 12 so as to match a processing format in the signal processing unit 14 described later. For example, an analog signal is converted into a digital signal. A process of converting (or inversely converting), a process of multiplexing signals of a plurality of channels included in the audio signal (or the inversely demultiplexing process), and the like are possible.

  Furthermore, the source device 1 includes a signal processing unit 14 and executes predetermined signal processing on the audio signal from the audio input processing unit 13. In this signal processing, for example, the sound signal of each channel is corrected before transmission, such as changing the sound field according to the distance between the terminal device 3 whose position is estimated by the position estimation unit 10a and each speaker device 2. There is. The signal processing unit 14 and the signal processing unit 22 of the speaker device 2 to be described later are often configured by a DSP (Digital Signal Processor).

  The control unit 10 can wirelessly communicate with the speaker device 2 via the wireless communication unit 15. Specifically, the control unit 10 can receive information related to wireless communication between the speaker devices 2 and information related to wireless communication between the terminal device 3 and the speaker device 2 transmitted from the speaker devices 2. An uncompressed audio signal (audio signal as it is the original sound) or a compressed audio signal of each channel subjected to signal processing by the signal processing unit 14 can be transmitted to the speaker device 2. Hereinafter, an example in which an audio signal is wirelessly transmitted without compression will be described. If the audio signal of each channel is transmitted to the speaker device without compression, the speaker device can output high-quality sound.

  The source device 1 includes, for example, an operation unit 16 that passes an operation signal or the like by a user operation to the control unit 10 and a display unit 17 that displays various types of information. The operation unit 16 includes, for example, a button provided on the casing of the source device 1, a receiving unit that receives an infrared signal from a remote controller, a Bluetooth short-range wireless signal, and the like. In addition, the display unit 17 can display information related to operations performed on the operation unit 16 (for example, volume and sound quality information).

On the other hand, the speaker device 2 is a wireless receiver including a control unit 20 that controls the entire device and a wireless communication unit 21.
The control unit 20 is configured by, for example, a CPU, and can wirelessly communicate with the source device 1 via the wireless communication unit 21, and the speaker device 2 performs uncompressed each channel transmitted from the source device 1 by wireless communication. Audio signals can be received.

  An example of wireless communication between the wireless communication unit 15 of the source device 1 and the wireless communication unit 21 of the speaker device 2 is wireless communication based on the WiSA standard. In this case, for the wireless communication unit 15 and the wireless communication unit 21, modules on the transmission side and the reception side that are being standardized by WiSA Association are applied. The WiSA standard is one of standards for wirelessly transmitting audio signals using uncompressed PCM (Pulse Code Modulation). Both the source device and the speaker device are composed of wireless communication devices, and the uncompressed audio is transmitted from the source device to the speaker device using uncompressed PCM using a communication protocol compliant with WiFi. The speaker device can transmit parameters such as the specification information to the source device.

The speaker device 2 includes a speaker unit 25 and a signal processing unit 22, an audio adjustment unit 23, and an amplifier unit (AMP) 24.
The signal processing unit 22 performs predetermined signal processing such as various types of filter processing on the audio signal received by the wireless communication unit 21 and passes it to the audio adjustment unit 23. Further, the signal processing unit 22 includes, for example, a D / A converter (DAC) for converting the audio signal from a digital signal to an analog signal before or after the signal processing. Parameters necessary for this signal processing are stored, for example, in an internal memory of the signal processing unit 22 and are read out as necessary. The signal processing unit 22 can rewrite parameters necessary for the signal processing based on the control signal from the source device 1.

The audio adjusting unit 23 can pass the audio signal from the signal processing unit 22 to the AMP 24 and adjust the AMP 24 to adjust the size and delay time of the audio output from the speaker unit 25. The AMP 24 amplifies the audio signal from the audio adjustment unit 23 and outputs the amplified audio signal to the speaker unit 25.
In addition, the speaker device 2 includes a button and a communication unit 27 provided on the housing thereof, and the communication unit 27 includes a transmission / reception unit capable of transmitting and receiving, for example, a Bluetooth short-range wireless signal. For this reason, the communication unit 27 periodically transmits a Bluetooth short-range wireless signal to another speaker device and receives the signal from the other speaker device, such as at the time of activation, and also transmits a Bluetooth short-range wireless signal to the terminal device 3. Signals are also periodically transmitted and received from the terminal device 3 and passed to the control unit 20. In addition, since the frequency band of this short-range radio is different from the frequency band of the WiSA standard, there is no interference. Although an example using Bluetooth for measuring the distance will be described below, the distance between the speaker devices and the distance between the terminal device and the speaker device can be measured even by wireless communication based on the WiSA standard.

The control unit 20 transmits a short-range wireless signal from another speaker device or a short-range wireless signal from the terminal device 3 to the source device 1 via the wireless communication unit 21.
As described above, since the speaker device and the source device are all connected wirelessly, there is no need to route the speaker device and the source device with a cable, and the position of each speaker device can be set freely, which is convenient.

  FIG. 2 is a schematic diagram illustrating an example of an arrangement of each speaker device. In this example, each of the five speaker devices SP1, SP2, SP3, SP4, SP5 is, for example, front left (L), center (C), front right (R), surround left (LS), surround Although the speaker device for the right (RS) channel is shown, for example, it can be changed to a different speaker characteristic by an instruction from the source device 1 described in FIG. A subwoofer (LFE) may be provided. Of course, it is possible to deal with 7.1 channels or more.

  The source device can determine the positions of the speaker devices SP1 to SP5. Specifically, for example, when the speaker device SP1 receives a short-range wireless signal from the speaker device SP3 and wirelessly transmits it to the source device, the source device determines the speaker device SP1 from the radio wave transmission time between the speaker devices SP1 and SP3. , SP3 can be measured. Further, when the speaker device SP1 receives a short-range wireless signal from the speaker device SP4 and wirelessly transmits it to the source device, the source device determines the distance between the speaker devices SP1 and SP4 from the transmission time of the radio wave between the speaker devices SP1 and SP4. Can be measured. Accordingly, the source device can obtain the positions of the speaker devices SP1, SP3, and SP4 from the triangular relationship shown in FIG.

  Similarly, when other speaker devices wirelessly transmit a short-range wireless signal with the surrounding speaker devices to the source device, the source devices have all the speaker devices SP1 to SP5 due to the triangular relationship indicated by the dotted line in FIG. Can be determined. Thus, the positions of the speaker devices SP1 to SP5 are determined in advance by the source device. In addition, although the positional information on each speaker apparatus is memorize | stored in a memory | storage part (illustration omitted), you may enable it for a user to input separately.

(First embodiment)
FIG. 3 is a sequence diagram for explaining the sound field control according to the first embodiment, FIG. 4 is a schematic diagram showing positions of the terminal device and each speaker device, and FIG. It is a figure for demonstrating the content of an instruction to.
For one specification (implementation method) using the WiSA standard, an example in which an audio signal is corrected by the source device 1 described in FIG. 1 and each of the speaker devices SP1 to SP5 outputs an audio signal corrected by the source device as it is will be described. To do.

First, each of the speaker devices SP1 to SP5 shown in FIG. 4 requests information on the terminal device from the terminal device (step S1 in FIG. 3), and the terminal device transmits the information to each speaker device.
The source device requests speaker device SP1 to SP5 as speaker information for information related to wireless communication between the terminal device and the speaker device (step S2), and each speaker device wirelessly transmits the information to the source device. The information related to wireless communication is, for example, wireless communication time information based on the transmission time of radio waves from the terminal device to the speaker device. When this transmission time is short, the distance from the terminal device to the speaker device is shortened. By using such a relationship, the distance between the terminal device and the speaker device can be measured with high accuracy, and the position of the terminal device is increased. It becomes possible to estimate with accuracy.

  When the source device can collect information related to wireless communication from the speaker devices SP1 to SP5 (step S3), the source device estimates the position of the terminal device 3 (step S4). Specifically, for example, the position estimation unit 10a described in FIG. 1 acquires at least three distances between the terminal device and each speaker device from information related to a plurality of wireless communications, and creates a circle centered on each speaker device. If it draws and calculates | requires the intersection, the position of a terminal device can be estimated and the distance from a terminal device to each speaker apparatus can be calculated | required.

  Next, the source device corrects the audio signal to be output to each speaker device according to the distance between the terminal device whose position is estimated by the position estimation unit and each speaker device (step S5). For example, the signal processing unit 14 described with reference to FIG. 1 has a built-in equalizer, and the frequency equalizing process is performed based on an instruction from the control unit 10 to change the size of the audio output, the delay time, and the like. This correction is performed so as to match the speaker characteristics of each speaker device (for example, which channel the speaker is for).

  Subsequently, the source device transmits only the audio signal corrected as described above (this becomes the original sound) to each speaker device SP1 to SP5 without compression. Alternatively, the source device multiplexes the common data (audio signal data for all channels) with respect to all speaker devices SP1 to SP5 by time division or the like and transmits the multiplexed data to each speaker device SP1 to SP5. That is, the wireless transmission can be performed in a broadcast or multicast manner as common data without being divided.

  As a result, when only the audio signal is transmitted without being compressed, each of the speaker devices SP1 to SP5 outputs the received audio signal without being processed. Alternatively, when multiplexed and transmitted as common data to all speaker devices, each speaker device SP1 to SP5 extracts the data of its own channel from the received data for all channels, and the audio The signal is output without being processed (step S6).

More specifically, when a listener who possesses a terminal device moves and is, for example, at position 3 in FIG. 4, each speaker device SP <b> 1 to SP <b> 5 receives information on the terminal device from the terminal device and sends it to the source device. , Information related to wireless communication between the terminal device and each speaker device is transmitted.
As shown in FIG. 5, the source device has a distance between the terminal device and the speaker device SP1, for example, 2.9 m, a distance between the terminal device and the speaker device SP2, for example, 2 m, and a distance between the terminal device and the speaker device SP3, for example. The distance between the terminal device and the speaker device SP4 is determined to be 3.5 m, for example, 2.3 m, and the distance between the terminal device and the speaker device SP5, for example, 3.2 m. Further, for example, when the source device is the speaker device SP1, SP2, SP3, SP4, SP5, the front left (L), center (C), front right (R), surround left (LS), surround To the right (RS) channel speaker device.

  Then, the source device sets, for example, the speaker device SP3 (3.5 m) having the longest distance as the reference speaker so that the listener at the position 3 can listen at the same volume, and the other speaker devices SP1, The audio signal from SP2, SP4, SP5 is corrected. Specifically, the volume from the speaker device SP1 is set so that the volume from the speaker device SP1 (2.9 m) of the channel L and the speaker device SP3 (3.5 m; reference speaker) of the channel R are the same. It is made smaller than SP3. Further, the volume from the speaker device SP4 is made smaller than that of the speaker device SP5 so that the volume from the speaker device SP4 (2.3m) of the channel LS and the speaker device SP5 (3.2m) of the channel RS are the same. For example, each volume is set according to a difference in distance from the reference speaker. Further, the volume from the speaker device SP2 (2m) of channel C is set according to the distance difference from the reference speaker.

  Further, the source device corrects the audio signals from the other speaker devices SP1, SP2, SP4, SP5 so that the listener at position 3 can listen at the same timing. Specifically, the sound from the speaker device SP1 is sent to the speaker device so that the timing from the speaker device SP1 (2.9m) of the channel L and the speaker device SP3 (3.5m; reference speaker) of the channel R is the same. Delay from SP3. Further, the sound from the speaker device SP4 is delayed from the speaker device SP5 so that the timing from the speaker device SP4 (2.3m) of the channel LS and the speaker device SP5 (3.2m) of the channel RS are the same. For example, each delay amount is set according to a distance difference from the reference speaker. Further, the delay amount from the speaker device SP2 (2m) of the channel C is set according to the distance difference from the reference speaker.

As a result, the speaker devices SP1, SP2, SP3, SP4, and SP5 output audio signals corrected so that they can be heard at the same volume and timing at the position 3 as audio signals of the channels L, C, R, LS, and RS, respectively. To do.
Thus, in the audio | voice radio transmission system which transmits an audio | voice signal by radio | wireless communication to several speaker apparatus SP1-SP5 from a source device, the position of a terminal device is estimated in real time from the information regarding the radio | wireless communication with a terminal device and each speaker apparatus. Therefore, the optimum sound field can be formed while listening, and the optimum sound field can be quickly formed even if the terminal device moves.

Further, when the listener who possesses the terminal device is at, for example, the position 4 in FIG. 4, each speaker device SP1 to SP5 transmits information related to wireless communication between the terminal device and its own speaker device to the source device.
The source device has a distance between the terminal device and the speaker device SP1, for example, 3.7 m, a distance between the terminal device and the speaker device SP2, for example, 3 m, a distance between the terminal device and the speaker device SP3, for example, 2.5 m, The distance between the speaker device SP4 and the distance between the terminal device and the speaker device SP5 is determined to be, for example, 3.5 m and 2.8 m, for example. Further, for example, when the source device is the speaker device SP1, SP2, SP3, SP4, SP5, the front left (L), center (C), front right (R), surround left (LS), surround To the right (RS) channel speaker device.

  Then, the source device sets, for example, the speaker device SP1 (3.7 m) having the longest distance as the reference speaker so that the listener at the position 4 can listen at the same volume, and the other speaker devices SP2 to SP2. The audio signal from SP5 is corrected. Specifically, the volume from the speaker device SP3 is set so that the volume from the speaker device SP1 (3.7 m; reference speaker) of the channel L and the speaker device SP3 (2.5 m) of the channel R are the same. It is made smaller than SP1. Further, the volume from the speaker device SP5 is made smaller than that from the speaker device SP4 so that the volume from the speaker device SP4 (3.5 m) of the channel LS and the speaker device SP5 (2.8 m) of the channel RS are the same. For example, each volume is set according to a difference in distance from the reference speaker. Further, the volume from the speaker device SP2 (3m) of the channel C is set according to the distance difference from the reference speaker.

  Further, the source device corrects the audio signal from the other speaker devices SP2 to SP5 so that the listener at the position 4 can listen at the same timing. Specifically, the sound from the speaker device SP3 is transmitted to the speaker device so that the timing from the speaker device SP1 (3.7m; reference speaker) of the channel L and the speaker device SP3 (2.5m) of the channel R is the same. Delay from SP1. In addition, the sound from the speaker device SP5 is delayed from the speaker device SP4 so that the timing from the speaker device SP4 (3.5m) of the channel LS and the speaker device SP5 (2.8m) of the channel RS are the same. For example, each delay amount is set according to a distance difference from the reference speaker. The delay amount from the speaker device SP2 (3m) of the channel C is set according to the distance difference from the reference speaker.

Further, when the listener possessing the terminal device is at, for example, the position 2 in FIG. 4, each speaker device SP1 to SP5 transmits information related to wireless communication between the terminal device 3 and each speaker device to the source device. .
The source device has a distance between the terminal device and the speaker device SP1, for example, 2.5 m, a distance between the terminal device and the speaker device SP2, for example, 3 m, a distance between the terminal device and the speaker device SP3, for example, 3.6 m, The distance between the speaker device SP4 and the distance between the terminal device and the speaker device SP5 is determined to be, for example, 2.3 m and 3.4 m, for example. Further, for example, when the source device is the speaker device SP1, SP2, SP3, SP4, SP5, the front left (L), center (C), front right (R), surround left (LS), surround To the right (RS) channel speaker device.

  Then, the source device sets, for example, the speaker device SP3 (3.6 m) having the longest distance as a reference speaker so that the listener at the position 2 can listen at the same volume, and the other speaker devices SP1, SP1. The audio signal from SP2, SP4, SP5 is corrected. Specifically, the volume from the speaker device SP1 is set so that the volume from the speaker device SP1 (2.5 m) of the channel L and the speaker device SP3 (3.6 m; reference speaker) of the channel R are the same. It is made smaller than SP3. Further, the volume from the speaker device SP4 is made smaller than that from the speaker device SP5 so that the volume from the speaker device SP4 (2.3m) of the channel LS and the speaker device SP5 (3.4m) of the channel RS are the same. For example, each volume is set according to a difference in distance from the reference speaker. Further, the volume from the speaker device SP2 (3m) of the channel C is set according to the distance difference from the reference speaker.

  Further, the source device corrects the audio signals from the other speaker devices SP1, SP2, SP4, and SP5 so that the listener at position 2 can listen at the same timing. Specifically, the sound from the speaker device SP1 is sent to the speaker device so that the timing from the speaker device SP1 (2.5m) of the channel L and the speaker device SP3 (3.6m; reference speaker) of the channel R is the same. Delay from SP3. Further, the sound from the speaker device SP4 is delayed from the speaker device SP5 so that the timing from the speaker device SP4 (2.3m) of the channel LS and the speaker device SP5 (3.4m) of the channel RS are the same. For example, each delay amount is set according to a distance difference from the reference speaker. The delay amount from the speaker device SP2 (3m) of the channel C is set according to the distance difference from the reference speaker.

Further, when the listener who possesses the terminal device is at, for example, position 5 in FIG. 4, each speaker device SP1 to SP5 transmits information related to wireless communication between the terminal device and its own speaker device to the source device.
The source device has a distance between the terminal device and the speaker device SP1 of, for example, 5 m, a distance between the terminal device and the speaker device SP2, for example, 4 m, a distance between the terminal device and the speaker device SP3, for example, 1.5 m, and the terminal device and the speaker device. The distance from SP4 is determined to be, for example, 5.2 m, and the distance between the terminal device and the speaker device SP5 is determined to be, for example, 2 m. Further, for example, when the source device is the speaker device SP1, SP2, SP3, SP4, SP5, the front left (L), center (C), front right (R), surround left (LS), surround To the right (RS) channel speaker device.

  Then, the source device sets, for example, the speaker device SP4 (5.2 m) having the longest distance as a reference speaker so that the listener at the position 5 can listen at the same volume, and the other speaker devices SP1 to SP1. The audio signal from SP3 and SP5 is corrected. Specifically, the volume from the speaker device SP5 is set to be higher than that of the speaker device SP4 so that the volume from the speaker device SP4 (5.2m; reference speaker) of the channel LS and the speaker device SP5 (2m) of the channel RS are the same. Also make it smaller. Further, the volume from the speaker device SP3 is made smaller than that of the speaker device SP1 so that the volume from the speaker device SP1 (5m) of the channel L and the speaker device SP3 (1.5m) of the channel R are the same. Each volume is set according to the distance difference from the reference speaker. Further, the volume from the speaker device SP2 (4m) of the channel C is set according to the distance difference from the reference speaker.

  Further, the source device corrects the audio signal from the other speaker devices SP1, SP2, SP4, SP5 so that the listener at the position 5 can listen at the same timing. Specifically, the sound from the speaker device SP5 is sent from the speaker device SP4 so that the timing from the speaker device SP4 (5.2m; reference speaker) of the channel LS and the speaker device SP5 (2m) of the channel RS are the same. Also delay. Also, the sound from the speaker device SP3 is delayed from the speaker device SP1 so that the timing from the speaker device SP1 (5m) of the channel L and the speaker device SP3 (1.5m) of the channel R are the same. Each delay amount is set according to the distance difference from the reference speaker. Further, the delay amount from the speaker device SP2 (4m) of the channel C is set according to the distance difference from the reference speaker.

  Similarly, when the listener who possesses the terminal device is, for example, at position 1 in FIG. 4, the source device estimates the current position of the terminal device, and the listener at position 1 can listen at the same volume and timing. Thus, for example, the speaker device SP3 having the longest distance is set as the reference speaker, and the audio signals from the other speaker devices SP1, SP2, SP4, SP5 are corrected.

FIG. 6 is a schematic diagram showing an example of sound field control. When a listener who has a terminal device is at position 5, for example, each speaker device SP1 to SP5 is a source, as in the example described in FIG. Information related to wireless communication between the terminal device and each speaker device is transmitted to the device.
The source device has a distance between the terminal device and the speaker device SP1 of, for example, 5 m, a distance between the terminal device and the speaker device SP2, for example, 4 m, a distance between the terminal device and the speaker device SP3, for example, 1.5 m, and the terminal device and the speaker device. The distance from SP4 is determined to be, for example, 5.2 m, and the distance between the terminal device and the speaker device SP5 is determined to be, for example, 2 m.

  However, since it is the speaker devices SP1 and SP4 that are suitable for the listener whose sound travel direction is at the position 5, for example, the source device changes the combination of the speaker devices SP1 and SP4. Specifically, each of the speaker devices SP1 and SP4 is set as a speaker device for the front right (R) and front left (L) channels, and the other speaker devices SP2, SP3, and SP5 are stopped.

Then, the source device sets, for example, the speaker device SP4 (5.2 m) having the longest distance as a reference speaker so that the listener at the position 5 can listen at the same volume, and the speaker device SP1 of the channel R. The sound signal is corrected so that the volume from (5m) is smaller than the speaker device SP4 (5.2m; reference speaker) of the channel L.
Further, the source device is configured such that the sound from the speaker device SP1 (5m) of the channel R is the speaker device SP4 (5.2m; reference speaker) of the channel L so that the listener at the position 5 can listen at the same timing. The audio signal is corrected so as to be delayed.

As a result, the speaker devices SP1 and SP4 output audio signals corrected so that they can be heard at the position 5 at the same volume and timing as audio signals of the channels R and L, respectively.
Note that the speaker devices SP1, SP2, SP4 far from the listener at the position 5 are stopped, and the speaker devices SP3, SP5 are connected to the front right (R) and front left (L) speaker devices, respectively. It is also possible to set to.

FIG. 7 is a schematic diagram illustrating another example of sound field control. When the listener who possesses the terminal device is at position 6, for example, as in the example described with reference to FIG. 4, each speaker device SP1 to SP5 is a source device and information related to wireless communication between the terminal device and its own speaker device. Respectively.
The source device has a distance between the terminal device and the speaker device SP1, for example, 4 m, a distance between the terminal device and the speaker device SP2, for example, 3.8 m, a distance between the terminal device and the speaker device SP3, for example, 4.5 m, The distance between the speaker device SP4 and the distance between the terminal device and the speaker device SP5 is determined to be, for example, 2.5 m and 2 m, for example.

  However, since the speaker devices SP1 to SP3 are suitable for the listener at the position 6, for example, the source device connects each of the speaker devices SP1 to SP3 to the front left (L), center (C), While setting the speaker devices for the front right (R), surround left (LS), and surround right (RS) channels, the other speaker devices SP4 and SP5 are stopped. That is, the speaker device SP1 is, for example, the speaker device for the L and LS channels by 80% on the front left (L) and 20% on the left of the surround (LS), and the speaker device SP2 is, for example, at the center (C). For example, the speaker device SP3 is set as the speaker device for the R and RS channels by 80% on the front right (R) and 20% by the surround right (RS) on the speaker device for the C channel by 100%. .

  Then, the source device sets, for example, the speaker device SP3 (4.5 m) having the longest distance as the reference speaker so that the listener at the position 6 can listen at the same volume, and the speakers of the channels L and LS. The audio signal is corrected so that the volume from the device SP1 (4 m) is smaller than the speaker device SP3 (4.5 m; reference speaker) of the channels R and RS. Note that the volume from the speaker device SP2 (3.8 m) of the channel C is set according to the distance difference from the reference speaker, for example.

  Further, the source device transmits the sound from the speaker device SP1 (4m) of the channels L and LS to the speaker device SP3 (4.5m of the channels R and RS) so that the listener at the position 6 can listen at the same timing. The audio signal is corrected so as to be delayed from the reference speaker). Note that the delay amount from the speaker device SP2 (3.8 m) of the channel C is set according to the distance difference from the reference speaker.

  As a result, the audio signals corrected so that they can be heard at the same volume and timing at the position 6 are respectively output from the three channels of the speaker devices SP1 to SP3, but the speaker device SP1 generates the audio signals of the channels L and LS (down). The speaker device SP3 generates and outputs the audio signals of the channels R and RS, and the speaker device SP2 outputs the audio signal of the channel C, so that it can be output as a virtual 5 channel. .

  Note that the speaker device SP1 is, for example, the speaker device for the L and C channels of 85% at the front left (L) and 15% at the center (C), and the speaker device SP3 is, for example, at the front right (R). It is also possible to set speaker devices for R and C channels of 85% and 15% at the center (C), respectively, and output the speaker devices SP1 and SP3 as virtual three channels.

(Second Embodiment)
FIG. 8 is a sequence diagram for explaining the sound field control according to the second embodiment.
Another specification (mounting method) can be adopted in the WiSA standard. In this specification, the source device 1 described with reference to FIG. 1 transmits the audio signals of all channels to be used to the speaker devices SP1 to SP5 in an uncompressed and uncorrected state (as the original sound), and the audio signal processing parameters are set. Send. The audio signal processing parameter is a parameter used for predetermined signal processing in the signal processing unit 22 of each speaker device. In the case of this transmission method, the burden on the signal processing unit 14 of the source device can be reduced, and the channel device selection and the audio signal correction amount can be determined by the speaker devices SP1 to SP5, so that a higher degree of freedom can be set. become.

First, the same processing as steps S1 to S4 in FIG. 3 is performed (steps S11 to S14 in FIG. 8). Next, the source device causes the signal processing unit to generate an audio signal processing parameter to be output to each speaker device according to the distance between the terminal device whose position is estimated by the position estimation unit and each speaker device ( Step S15).
Subsequently, the source device transmits uncompressed and uncorrected audio signals of all channels used and audio signal processing parameters to the speaker devices SP1 to SP5.

  The signal processing unit 22 described with reference to FIG. 1 of each of the speaker devices SP1 to SP5 has a built-in equalizer. Therefore, each of the speaker devices SP1 to SP5 extracts the data of its own channel from the received data for all the channels, and performs the equalizing process on the extracted audio signal according to the received audio signal processing parameters. As a result, the sound volume and delay amount are changed, and the sound processed by itself is output (step S16).

(Third embodiment)
In the second embodiment, the source device generates the audio signal processing parameters and transmits them to the speaker devices SP1 to SP5. However, instead of the audio signal processing parameters, the distance between the terminal device whose position is estimated by the position estimation unit 10a described in FIG. 1 and each speaker device SP1 to SP5 is transmitted to each speaker device SP1 to SP5. Also good. In this case, each of the speaker devices SP1 to SP5 extracts the data of its own channel from the received data for all channels, and the received terminal device and each of the speaker devices SP1 to SP5 with respect to the extracted audio signal. If the equalizing process according to the distance is performed, the size and delay time of the audio output can be changed.

(Fourth embodiment)
In the first embodiment, the source device changes both the audio output size and the delay time, and in the second embodiment, each speaker device has an audio output size according to the audio signal processing parameter. An example in which both the delay time and the delay time are changed has been described. However, for example, the source device may change the size of the audio output, and each speaker device may change the delay time of the audio output according to the audio signal processing parameter.

The system according to each embodiment of the present invention has been described above. However, this system may not employ the technology premised on WiSA.
In addition, the technical features (configuration requirements) described in the above embodiments can be combined with each other, and a new technical feature can be formed by combining them.

DESCRIPTION OF SYMBOLS 1 ... Source device, 2, SP1, SP2, SP3, SP4, SP5 ... Speaker device, 3 ... Terminal device, 10 ... Source device control unit, 10a ... Position estimation unit, 11 ... Audio input terminal, 12 ... Source device Communication unit, 13 ... Audio input processing unit, 14 ... Signal processing unit of source device, 15 ... Wireless communication unit of source device, 16 ... Operation unit of source device, 17 ... Display unit, 20 ... Control unit of speaker device, 21 A wireless communication unit of the speaker device, 22 a signal processing unit of the speaker device, 23 an audio adjustment unit, 24 an amplifier unit (AMP), 25 a speaker unit, and 27 a communication unit of the speaker device.

Claims (6)

An audio wireless transmission system comprising a plurality of speaker devices, a source device that transmits an audio signal to each speaker device by wireless communication, and a terminal device,
Each of the speaker devices is capable of receiving a wireless signal from the terminal device, and transmits information related to wireless communication between the terminal device and its own speaker device to the source device,
The source device includes a position estimation unit that estimates the position of the terminal device from information related to the wireless communication, and each of the speaker devices according to the distance between the terminal device and the speaker device whose position is estimated by the position estimation unit. An audio signal to be output to the speaker device or a signal processing unit for determining an audio signal processing parameter, and a signal transmission unit for transmitting the determined audio signal or the audio signal processing parameter to each of the speaker devices A voice radio transmission system comprising: The voice radio transmission system according to claim 1,
The voice wireless transmission system, wherein the speaker device transmits information related to the wireless communication to the source device by wireless communication. The voice radio transmission system according to claim 1 or 2,
The information on the wireless communication is wireless communication time information based on a transmission time of radio waves from the terminal device toward the speaker device,
The source device calculates a distance between the terminal device and each speaker device from the wireless communication time information, and estimates a position of the terminal device from the calculated distance between the terminal device and each speaker device. Voice wireless transmission system characterized by this. The voice radio transmission system according to any one of claims 1 to 3,
The voice radio transmission system, wherein the voice signal transmitted from the source device is an uncompressed signal. The voice radio transmission system according to any one of claims 1 to 4,
The voice wireless transmission system, wherein the source device changes a combination of the speaker devices according to a distance between the terminal device whose position is estimated by the position estimation unit and each speaker device. A source device for transmitting audio signals to a plurality of speaker devices by wireless communication,
An information receiving unit that receives information related to wireless communication between the terminal device and the speaker device transmitted from each of the speaker devices; a position estimation unit that estimates the position of the terminal device from the received information related to the wireless communication; An audio signal to be output to each speaker device or a signal processing unit for determining an audio signal processing parameter according to the distance between the terminal device whose position is estimated by the position estimation unit and each speaker device; A source device comprising: a signal transmission unit that transmits the determined audio signal or the audio signal processing parameter to each of the speaker devices.

Images