JP2000165961A - Wireless transmission reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless transmission reception system where the installation is simplified and the freedom of the installing position of each reception unit is enhanced by adopting wireless transmission for a plurality of reception units of an audio signal and adopting wireless configuration for power supply to the reception units for reproducing the audio signal so as to avoid wiring among the respective reception units. SOLUTION: An audio signal received at an input terminal 2 is given to an A/D discrimination circuit 3, an A/D converter circuit 4 converts the signal into a digital signal and the converted signal is given to a signal processing circuit A5, where the signal format is converted into a signal format preset in advance by a control circuit A7, a control signal to control a sound volume and designation of a reception unit or the like is superimposed on the converted signal, a modulation circuit A6 modulates the superimposed signal, and a transmission circuit A6 transmits the audio signal 26 on which the control signal is superimposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a wireless transmission / reception system in which audio signal transmission and power supply are made wireless.

[0002]

2. Description of the Related Art In recent years, an audio reproduction system having a plurality of audio signal reproduction units represented by a surround has been widely adopted as a technique for creating a sound field. As an example of the configuration of this conventional audio reproduction system, a front speaker is composed of three channels by adding an R channel, an L channel and a center channel, and a mid speaker is composed of two channels of an R channel and an L channel. Some are configured with two channels of R channel and L channel.
That is, the entire front, mid and rear systems are composed of 7-channel speaker units.
In addition to the above configuration, the entire system is configured by a control unit including an amplifier circuit for driving each speaker, a signal processing circuit for processing an audio signal, and a control circuit for controlling these. Then, speakers corresponding to each of the plurality of amplifiers in the control unit are connected by cables, and each of the speakers is driven to reproduce an audio signal. That is, in the above system, the number of connected amplifiers and speakers is at least seven if at least one plus-minus pair wire is used. After the completion of the system wiring, wire processing of seven cables is performed.

[0003] In some systems, audio signals are transmitted wirelessly without wiring between units in the system. As a technique for realizing such an apparatus, for example, a first technique disclosed in Japanese Patent Application Laid-Open No. Hei 5-276600 and a second technique disclosed in Japanese Utility Model Application Laid-Open No. Hei 5-60078 are cited. As a technique for realizing a device for transmitting electric power wirelessly, Japanese Patent Application Laid-Open No.
A third technique disclosed in Japanese Patent Application Laid-Open No. 78382/78,
A fourth technique disclosed in Japanese Patent No. 98485 is cited.

[0004] In the first and second techniques for wirelessly transmitting audio signals, the first technique is to create left and right composite signals based on a left audio signal and a right audio signal. A wireless transmitter that converts the left and right combined signals into a monaural wireless signal and transmits the same, and receives a wireless signal from the wireless transmitter and converts the left and right combined signals into left and right combined signals with different delay times. A wireless receiver for generating first and second surround signals having different delay times by delaying, and right and left surround speakers for reproducing the first and second surround signals from the wireless receiver are provided in the same housing. It is a system that did.

[0005] Next, a second technique is a light receiving section for receiving an optical signal digitally modulated based on an audio signal, and a demodulating section for converting the light received by the light receiving section into an electric signal and demodulating the signal into an audio signal. An amplification unit for amplifying the audio signal from the demodulation unit, and a speaker for outputting the amplified audio signal from the amplification unit as audio are integrally attached to the same housing, and the light receiving unit is provided in the housing. The system is located on the upper part of the body.

A third technique for wirelessly transmitting electric power is a means for converting light such as elevator hall illumination light into electric power, and using the electric power from this means as an operating power source.
And a control unit that receives a radio signal for an operation instruction for landing notification and outputs an operation instruction to the landing notification device. As a fourth technique which is a technique for supplying power, as a fourth technique, a power supply device of a portable device converts a power supply supplied from the outside into an electromagnetic wave and transmits the electromagnetic wave, and receives the electromagnetic wave to generate a predetermined DC power. A technology including a power receiving unit that converts and supplies the converted power to a portable device is disclosed.

[0007]

In the above-mentioned conventional system, the arrangement of the control unit and the front speaker unit is generally close to each other, and there is not much restriction in connecting each unit. Does not. However, the wiring to the mid speaker and the rear speaker has to be wired from the control unit of the front main body with a connecting cable, and the cable must be processed. That is, the mid speaker R channel, the L channel, and the rear speaker R channel,
The wiring of the cable to the L channel is complicated, and there are restrictions due to the cable length and restrictions on the installation location. Also, the wiring material itself was not preferable in terms of interior.
Further, due to the wiring, the arrangement position is further restricted, and there is a problem that the original audio reproduction function cannot be exhibited due to the separation from the ideal arrangement position. Also, when the position where each unit is arranged is moved, there is also a problem that the re-wiring of the cable and the like are accompanied and the arrangement cannot be easily moved.

[0008] In the wireless reproduction system, the first
In this technique, a left and right combined signal is created based on a left audio signal and a right audio signal, and the combined signal is converted into a monaural wireless signal and transmitted. A receiver receives the left and right combined signals, delays the combined signals with different delay times, creates different first and second surround signals, and reproduces the signals with left and right surround speakers in the same housing. It is. This first technique is only applicable to the rear speakers, and does not hold when there is a mid speaker, and it is premised that the rear left and right speakers are in the same housing. That is, the signals delayed from the signals from the receiver are input to the amplifiers, respectively, and supplied to the left and right surround speakers. Cables are used to connect the amplifiers and the left and right surround speakers. When the left and right surround speakers are in different housings, wiring between the units is naturally required, and wireless communication cannot be achieved.

The second technique is to transmit an audio signal using an optical signal digitally modulated based on the audio signal. Also in this case, to reproduce the transmitted signal, a speaker integrally mounted in the same housing is reproduced, and when reproducing for the rear and the mid, it is necessary to assign dedicated signals to each. That is, four different signals must be used for the left and right channels only for the rear and the mid.

Further, since the audio signal is transmitted by the optical communication having sufficiently high directivity, a transmission unit is required for each corresponding reception unit, and a modulation circuit and a transmission circuit are individually provided in the transmission unit. ing. In addition, the direction between the transmitting unit and each receiving unit must be matched, and reflected light and the like must not enter the receiving unit other than the intended one.
The necessity of each dedicated modulation circuit and dedicated transmission circuit also has a problem that the system configuration becomes complicated.

As can be said in both the first technique and the second technique, when a signal is transmitted wirelessly, a plurality of receiving units are not limited even if an audio signal is received. Will reproduce the transmitted signal of the same content. That is, in the case of a sound field reproduction system, the signals reproduced by the rear L and R and the mid L and R are generally different from each other.
In addition, the designated reproduction sound at the place where the apparatus is installed must be reproduced, but the first technique can only be used for the rear (cannot be realized by wireless), but it is necessary to connect the L and R with a wired connection. In addition, the signal for the mid is not originally set, and even if the signal can be set, the speaker unit is located in the same housing, so that the left and right cannot be separately set wirelessly. In the second technique, as described above, there is a problem that the transmission unit and the reception unit dedicated to each unit are required in pairs, and the configuration of the transmission unit is complicated. Further, each receiving unit arranges the system for the purpose of creating a sound field by reproducing a signal set individually, but the first technology and the second technology do not achieve this purpose. Was.

Next, even when the transmission method of the audio signal is made wireless by light or radio waves, power for operating the receiving circuit, the control circuit, the speaker driving power amplifier circuit and the like in the receiving unit is required. . This power source is supplied from an AC power source or a battery.

When the power is supplied from the former AC power source, A
It is necessary to use a cable from the C outlet to supply the unit. When power is supplied from this AC power source, even if the signal is made wireless, the power supply cable for operating the receiving unit must be wired, and the result is almost the same as when the signal cable is wired. And there is a problem similar to the above problem. Next, when the power for operating the receiving unit is supplied by the battery as in the latter case, basically, both the signal and the power are wireless.

However, in the case of power supply by the above-mentioned battery, when the battery runs out, there is a need to replace the battery. Furthermore, for mid,
As a place where the reproduction system for the rear is installed, it is common to enhance the sound field effect or to install the system at a high position such as a ceiling so as not to disturb the installation position. As described above, when the battery is replaced on the ceiling or the like, it becomes more difficult to replace the battery. Also, if the power consumed by each receiving unit is uniform, the battery replacement time will be almost the same time,
The power consumption of each unit differs due to a difference in reproduced sound, etc., and is not the same, and the battery replacement time is also shifted, so that the management of the battery replacement time becomes complicated. Further, even if the primary battery is used for the secondary battery, if the battery is exhausted, it is necessary to remove the secondary battery from the unit and charge the battery, or charge the battery with the secondary battery attached. In the case of the former method, like the primary battery, it must be removed from the receiving unit, recharged by an external charger, and then attached to the receiving unit again. In the latter case, the charging power is obtained from an external power supply, for example, an AC power supply. In order to obtain electric power from the AC power supply, a power supply cable is required, and wiring materials are generated. In this case, the same problem as when the receiving unit is operated by the AC power source occurs.

Next, as can be seen in the third technology for wirelessly transmitting power, there is a hall notification device that converts the light of a hall lighting lamp into electric power and uses this electric power as an operation power source. In this technology, power is secured only by light.
This is true when there is always lighting for passengers, such as elevators, but it is not always the case that there is lighting like an audio playback system, and even without lighting, it does not work due to the nature of the use environment of the audio system must not. If the lighting is dark at night or the place where the receiver is installed is dark, power for operating the receiver cannot be secured, and as a result, the system will not be established. In addition, even with a built-in secondary battery, the power for charging cannot be obtained, so that there is a problem that the power must be secured by wired charging, or by removing and charging, and then incorporating the battery.

Next, as seen in the fourth technology, the power supply device of the portable device converts the power supply supplied from the outside into an electromagnetic wave and transmits the electromagnetic wave, and receives the electromagnetic wave and converts it into a predetermined DC power. And a charging means for supplying the charging device to the portable device. By combining the fourth technology with the first technology or the second technology, a system can be basically configured wirelessly with respect to power and audio signals. However, in combination with the first technology and the second technology, cables are required for a plurality of receivers as described in the above-described first technology and the second technology.
The same signal is reproduced or the configuration of the system becomes complicated.

Therefore, an object of the present invention is to make wireless transmission of audio signals to a plurality of receiving units and to make wireless a cable for supplying power for reproducing audio signals in the receiving units. An object of the present invention is to provide a wireless transmission / reception system in which wiring work between individual receiving units is eliminated, installation work is simplified, and the degree of freedom in the installation position of each receiving unit is increased.

[0018]

In order to solve the above-mentioned problems, a wireless transmission / reception system according to the first aspect of the present invention has a first transmission / reception system.
And a plurality of receiving units having a first receiving unit and a second receiving unit, wherein the first transmitting unit comprises an audio signal. And a control signal for controlling the receiving unit. The first transmitting means receives a signal transmitted from the first transmitting means, and the second transmitting means receives the signal transmitted from the first transmitting means. The power for driving the receiving means is transmitted by electromagnetic waves, and the second receiving means receives the power transmitted from the second transmitting means. With the control signal superimposed on the audio signal, only the individually specified receiving unit can be selected and a signal corresponding to the selected receiving unit can be reproduced. Thus, it is not necessary to provide a dedicated modulation circuit and a transmission circuit on the transmission unit side for each of a plurality of reception units. Even if there are a plurality of receiving units, only one transmitting unit is required, and the modulation circuit and the transmitting circuit can be simplified.

Further, audio signals can be transmitted wirelessly, and power can be transmitted and received for operating circuits on the receiving side. As a result, since both the signal and the power are wireless, the necessity of wiring a cable is eliminated, and since there is no need to supply power via a wire, the degree of freedom of arrangement of each unit is increased.

Further, in the wireless transmission / reception system according to the second aspect, since the audio signal transmitted by the first transmission means is a compressed signal, the data amount of the audio signal can be reduced, and Transmission time can be reduced. In addition, various control signals can be added to the reduced amount of data, and even if there are a plurality of receiving units, signals assigned to each of the receiving units can be reproduced without delay. This can cope with the fact that as the number of receiving units increases, the amount of data allocated to each unit increases, and the transmission time of data to be transmitted necessarily increases. .

Furthermore, in the wireless transmission / reception system according to the third aspect, since the first transmission means transmits light as a carrier, it can be distinguished from power transmission. Further, mutual interference between audio signal transmission and power transmission can also be prevented. Further, in the wireless transmission / reception system according to claim 4, the receiving unit includes setting means for setting a part of the receiving unit, and based on a control signal sent from the transmitting unit by a setting position of a switch, The set part can be played.

Accordingly, it is not necessary to transmit the signal on the transmission side by a cable or by increasing the directivity so that the signal reaches only the target unit, and the transmission direction is not considered for the reception unit and the transmission unit. . By switching the switch, any part can be dealt with, and the degree of freedom of setting is improved unlike the part dedicated unit which is set in advance when the receiving unit is installed.

In the wireless transmission / reception system according to the fifth aspect, the first transmission means and the second transmission means are different from each other, so that each characteristic can be adapted.
That is, in the case of an audio signal, it is necessary to transmit a signal corresponding to each unit. In the case of power transmission, the same signal may be used for each unit, and a more efficient method can be adopted depending on the type of signal for each unit.

According to a sixth aspect of the present invention, in the wireless transmission / reception system, the receiving unit includes a PDM modulator for PDM modulating the audio signal received by the first receiving means, and reproduces the PDM modulated signal. Therefore, heat generation in the unit can be suppressed, and furthermore, the high-efficiency regeneration system can reduce power consumption and the burden of transmitting power from the transmission unit. In addition, the whole occupied volume including the control circuit can be reduced for the above reason, and a small and lightweight unit can be provided.

In the wireless transmission / reception system according to the present invention, the receiving unit includes charging means for charging the secondary battery with the power received by the second receiving means, so that the power can be uniformly handled. it can. When the audio signal is played back by the receiving unit, the power consumed by the receiving unit differs depending on the type and level of the signal.When only low power is required, the power on the transmitting side should be averaged by charging the secondary battery. Can be. Furthermore, when the power supply is set slightly lower than the maximum power required by the receiving unit, and when the power is insufficient, the output capability of the transmission circuit can be suppressed by supplying from the secondary battery, and the components are also reduced. It can be inexpensive and cost effective.

In the wireless transmission / reception system according to the present invention, the charging means charges the secondary battery from the solar battery as an auxiliary power source, so that the power source in the unit can always be kept stable. . That is, by charging with the solar cell, power can be charged to the secondary battery even during standby, and there is no need to transmit power except during use. Also, even if the secondary battery consumes power due to self-discharge of the secondary battery and a small amount of power used during standby of the unit, the secondary battery can always be charged so that the power of the receiving unit is not insufficient.

In the wireless transmission / reception system according to the ninth aspect, the second transmission means has a wide directivity capable of transmitting power to the plurality of reception units,
When each receiving unit on the receiving side is installed, it is not necessary to consider the directionality, so that not only the degree of freedom of installation is improved, but also the degree of freedom of arrangement of the receiving units can be improved.

According to a tenth aspect of the present invention, in the wireless transmitting / receiving system, when the transmitting unit transmits a power-off control signal to the receiving unit when the power of the wireless transmitting / receiving system is turned off, the receiving unit ends the power-off operation. Since the power of the receiver itself and the transmitter is turned off after the time corresponding to the time that elapses, the timing of turning off the power of the receiver unit and the transmitter unit is not disturbed, and the situation that only the receiver unit does not turn off is prevented. Can be avoided.

In the wireless transmission / reception system according to the present invention, when the power supply of the wireless transmission / reception system is turned off, the charge amount of the secondary battery is detected, and based on the charge amount, the second transmitting means and the second transmission means are detected. By providing control means for turning off the receiving means, the power of the secondary battery is immediately turned off in a fully charged state, and when not fully charged,
The transmission of power can be maintained until the battery is fully charged, and the transmission can be turned off after the battery has been fully charged, whereby the receiving unit can maintain the standby state for a long time even when the transmitting unit is turned off. In addition, since the receiving unit is in the standby state even when the system is started, the starting of the receiving unit is quickened, and the time from when the power is turned on to when the reproduction becomes possible can be reduced.

Further, the wireless transmitting / receiving system according to the twelfth aspect of the present invention includes a control unit for providing a difference between the transmission start times of the first transmitting unit and the second transmitting unit when the power of the wireless transmitting / receiving system is turned on. Thus, the receiving side can receive the audio signal and the control signal in a stable state. That is, the power is transmitted from the second transmitting means for supplying power, the power of the receiving side is stabilized first, and then the audio signal and the control signal are received from the first transmitting means when the receiving circuit is stabilized. Since the transmission of the control signal is started, the signal can be stably received.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of an overall system of a wireless transmission / reception system according to the present invention. In the figure, reference numeral 1 denotes a transmission unit that transmits 26 audio signals and control signals, and 27 power signals.
Consists of a single unit. 13 is an audio signal from the transmission unit 1, a control signal 26 and a power signal 2
7 is a receiving unit for driving an internal circuit of the receiving unit with the received power and reproducing the audio signal.

The receiving unit 13 determines the number of receiving units according to the configuration of the system. Each receiving unit 13 is controlled by a control signal superimposed on the audio signal. Then, the signals assigned to the individual receiving units 13 are reproduced by the control signal to form a sound field space. Regarding the reproduction of the audio signal, it is necessary to respond to the plurality of receiving units by the control signal as described above. However, regarding the transmission of the power, the power to be transmitted and received is not regulated for any of the receiving units. Since there is no designation, power is transmitted in a wide directivity or non-directional manner.

Next, each configuration of the transmission unit 1 and the reception unit 13 constituting the wireless transmission / reception system will be described. FIG. 2 is a block diagram showing a basic configuration of the transmission unit according to the first embodiment of the wireless transmission / reception system. In FIG. 1, reference numeral 1 denotes a transmission unit. Reference numeral 2 denotes an input terminal to which an audio signal is input. The audio signal input to the input terminal 2 is input to an A / D (analog / digital) discriminating circuit 3. If the audio signal input to the A / D discriminating circuit 3 is an analog signal, the audio signal is input to an A / D (analog / digital) conversion circuit 4 and the A / D
The signal is converted into a digital signal by the D conversion circuit 4 and input to the signal processing circuit A (5). If the audio signal input to the A / D determination circuit 3 is a digital signal, the audio signal passes through the A / D conversion circuit 4 and is input to the signal processing circuit A5.

The control circuit A 7 is a control circuit for controlling the A / D conversion circuit 4, the signal processing circuit A5, and the power supply circuit 10. The control circuit A7 has an 8
Is connected to the key input circuit. The audio signal input to the signal processing circuit A5 is converted into a signal format set in advance by the control circuit A7, and further, a control signal for controlling the volume and designation of the receiving unit 13 in FIG. 6 to the modulation circuit A. The audio signal on which the control signal modulated by the modulation circuit A6 is superimposed is input to the nine transmission circuits A. And the transmission circuit A9
An audio signal 26 on which a control signal is superimposed is output.

Reference numeral 10 denotes a power supply circuit for supplying power to each circuit in the transmission unit 1 and for supplying power to a reception unit 13 described later. Reference numeral 11 denotes a modulation circuit B that modulates power to be transmitted from the power supply circuit 10. The power supply signal 27 modulated by the modulation circuit B11 is output from the twelve transmission circuits B. The above is the description of the block diagram of the transmission unit 1 configured by the audio signal transmission unit on which the control signal is superimposed and the power transmission unit.

FIG. 3 is a block diagram showing a basic configuration of a receiving unit according to the first embodiment of the wireless transmitting / receiving system. In the figure, reference numeral 13 denotes a receiving unit. A receiving circuit 14 receives an audio signal on which a control signal is superimposed. The signal received by the receiving circuit A14 is input to 15 demodulation circuits A. The signal demodulated by the demodulation circuit A15 is input to the 20 control circuits B. Control circuit B2
At 0, the received signal is divided into an audio signal and a control signal.
Then, the divided audio signal is recorded in the memory circuit 19 connected to the control circuit B20. The recorded audio signal is called from the memory circuit 19 by a synchronization signal in the control signal, and is input to the 16 signal processing circuits B. The audio signal input to the signal processing circuit B16 is subjected to signal processing based on the control signal, and is input to a D / A (digital / analog) conversion circuit 17.

The audio signal converted into an analog signal by the D / A conversion circuit 17 is power-amplified by an amplifier circuit 18. The power-amplified audio signal is reproduced by 21 speakers. Next, the flow of the power supply system will be described. Reference numeral 22 denotes a receiving circuit B that receives a power supply signal. A demodulation circuit B demodulates the power supply signal received by the reception circuit B22. The output from the rectifier circuit in the demodulation circuit B23 is input to 25 power supply circuits. Power supply circuit 2
After creating a voltage corresponding to each circuit of the receiving unit in 5, a power supply suitable for each circuit is supplied. The operation of the wireless transmission / reception system according to the first embodiment configured as described above will be described in detail.

First, the operation of the transmitting unit 1 for transmitting an audio signal on which a control signal is superimposed will be described. The audio signal input to the input terminal 2 is input to the A / D discriminating circuit 3
To enter. If the signal input to the A / D discriminating circuit 3 is an analog signal, the input audio signal is input to the A / D converting circuit 4 and converted into a digital signal by the A / D converting circuit 4 before signal processing. Input to the circuit A5. If the input audio signal is a digital signal, the A / D determination circuit 3 sends a control signal in which the input audio signal is a digital signal to the control circuit A7. Based on the control signal input to the control circuit A7, the control circuit A7
An instruction is given to pass the audio signal input to the / D conversion circuit 4. The A / D conversion circuit 4 receiving the instruction from the control circuit A7 passes the input audio signal and inputs the audio signal to the signal processing circuit A5. The digitized audio signal input to the signal processing circuit A5 is transmitted to the control circuit A7 here.
The audio signal is processed by the signal processing circuit A5 via the control circuit A7 based on the processing specification inputted from the outside by the key input circuit 8 connected to. For example, it sets the individual volume level of each receiving unit at the transmission destination, filters the reproduced sound assigned to each receiving unit, and further performs processing such as delay and reverberation. Furthermore, data specifying each receiving unit from the control circuit A7,
A control signal such as a synchronization signal for adjusting the reproduction timing between the receiving units is input to the signal processing circuit A5, and the control signal is superimposed on the audio signal.

Here, the control signal and the audio signal will be described. For example, as shown in FIG. 9, a frame synchronization signal and a frame signal are alternately arranged in a bit stream, and each frame signal is assigned to each receiving unit. . That is, if the number of receiving units is 7, frame signals for m = 7 are allocated. Each block of the frame includes a frame synchronization signal, a control signal, and an audio signal. The control signal is a unit identification signal,
It is composed of data such as a volume setting signal, a filter characteristic signal, and a delay and reverberation setting signal. Here, the control signal and the audio signal naturally differ depending on whether the transmission side processes the signal for each reception unit or the reception unit processes the audio signal.

Next, the signal obtained by superimposing the control signal on the signal-processed audio signal is input to the modulation circuit A6. The audio signal and the control signal input to the modulation circuit A6 are modulated for transmission by the transmission circuit A9.

Here, since the audio signal and the control signal are digital, the transmission means uses MSK (Minimum Shift Keying) modulation, which is a digital modulation method. Then, the MSK-modulated audio signal and control signal are transmitted from the transmission circuit A 9. Further, it is also possible to transmit using light, and in this case, the modulated audio signal and control signal are transmitted from the transmission circuit A 9. Here, the transmission circuit A9 uses an infrared LED. In the case of optical transmission, directivity is strong, so that transmission is made non-directional by arranging a plurality of infrared LEDs or using a diffusion lens. There are several other modulation schemes, and another modulation scheme suitable for the present application may be used. Further, the light emitting element used in the transmission circuit A9 is not limited to the infrared LED, and another light emitting element may be used.

At this point, if the audio signal input to the signal processing circuit A5 is processed as it is with the digitized data and transmitted, the data amount increases. Therefore, in order to increase the transmission efficiency, the transmission efficiency is increased by compressing the transmitted audio signal (for example, to about 1/5 in the case of an audio signal) to reduce the amount of data and transmitting. In this case, as will be described later, the signal needs to be expanded by the signal processing circuit B16 in the receiving unit 13.

In the signal processing circuit A5, by superimposing a control signal on the audio signal, each signal to be received can be transmitted to a plurality of receiving units by one transmission signal. In general, reproduced sounds in each receiving unit are individually different, and in order to reproduce different signals in each receiving unit, it is necessary to transmit a dedicated signal for each receiving unit by a transmission circuit. .
A control signal is superimposed so that a part set in advance on the receiving unit side is reproduced without using such a dedicated transmitting circuit, and the receiving unit 13 reproduces based on the control signal. For example, if the number of receiving units is seven, it can be determined by assigning at least a 3-bit control signal.

Next, the power transmission function will be described. When you input to turn on the power by key input 8,
The power supply circuit 10 starts up via the control circuit A7,
The transmission DC power is input to the modulation circuit B11. Then, the DC power input to the modulation circuit B11 is modulated into high-frequency power capable of spatial transmission and transmitted from the transmission circuit B12.

Here, the transmission circuit B12 comprises a high-frequency power amplifier circuit and a transmitting antenna circuit for spatial transmission of high-frequency power. The setting of the power supply in the power supply circuit 10, the modulation circuit B11, and the transmission circuit B12 has the ability to supply the necessary power to the reception unit 13. Since the output can be set according to the efficiency of the speaker for reproducing the audio signal, a speaker unit having the highest possible efficiency is used for the speaker. As a result, the power for driving the loudspeaker can be reduced, and the correspondence of the transmission power can be reduced. Therefore, the efficiency of the whole system also increases.

In order to supply power from the transmitting circuit B12 to the receiving unit 13 on the premise that the receiving unit 13 is installed at an arbitrary location, a dedicated transmitting circuit must be set for each receiving unit. Compared to
Although omnidirectional transmission is disadvantageous in terms of transmission efficiency,
Considering the system configuration, control, shape, number of parts, etc., it is totally advantageous. Here, the order of starting transmission at power-on is such that an audio signal and a control signal are transmitted after a power supply signal is transmitted. As a result, the audio signal and the control signal are transmitted after the power supply in the receiving unit is turned on, and each circuit in the receiving unit can receive the audio signal and the control signal in a stable state.

Next, when the power is turned off, the power is turned off by the key input circuit 8. The control circuit A7, which has received the power-off signal from the key input circuit 8, does not stop the power supply from the transmitting unit 1, but transmits a power-off control signal to the receiving unit 13 to turn off the power of the receiving unit 13 itself. The transmission is turned off with a delay of the processing time. Further, depending on the arrangement state of the receiving unit 13, it is also possible to set a function of continuously supplying power only for a set time even when the power is turned off, through the key input 8. In this case, the power supply circuit 25 of the receiving unit 13 is always on, so that the audio signal and the control signal can be reproduced as soon as they are transmitted, and no time lag occurs during the reproduction.

Next, the operation of the receiving unit 13 will be described in detail. The audio signal output from the transmission circuit A9 of the transmission unit 1 and the control signal 26 are received by the reception circuit A14. The received audio signal and control signal 26 are input to the demodulation circuit A15 and demodulated by the demodulation circuit A15. The demodulated audio signal and control signal are input to the control circuit B20. The control circuit B20 to record only the audio signals allocated to the receiving unit 13 based on a control signal input to the reception unit 13 is input to keep the control circuit B20 whether any part in advance in the memory circuit 19. Next, based on the timing pulse included in the control signal, the data of the audio signal recorded from the memory circuit 19 is extracted and input to the signal processing circuit B16. In the signal processing circuit B16, based on the control signal, the level of the reproduced sound is adjusted, the signal is passed through a designated filter, the audio signal is processed, and then the D / A conversion circuit 17 is processed.
To enter. If the audio signal assigned here is a compressed signal, the signal is expanded in the signal processing circuit B16 based on the control signal, and then processed as described above. Then, the audio signal processed by the signal processing circuit B16 is input to the D / A conversion circuit 17. The processed audio signal is converted by a D / A conversion circuit 17 into an analog signal. The audio signal converted into the analog signal is amplified by the amplifier circuit 18 to a level that can be reproduced by the speaker, and reproduced by the speaker 21. The speaker 21 used here uses a unit having the highest possible efficiency. This is to reduce the burden of power transmission by keeping the speaker driving power as low as possible.

Next, a power supply circuit that receives the signal 27 sent for power supply, converts it into electricity, and supplies it to each circuit in the receiving unit 13 will be described. The signal 27 transmitted for power supply is received by the receiving circuit B22 in the receiving unit 13.
To receive. The receiving circuit B22 includes a receiving antenna, a tuning circuit, and the like. The received power supply signal is input to the demodulation circuit B23, rectified by the rectification circuit in the demodulation circuit B23, and input to the power supply circuit 25.
In the power supply circuit 25, the transmitted power is converted into a specified voltage by a DC-DC converter in order to operate each circuit in the receiving unit 13, and the specified voltage is supplied to each circuit.

The transmission and reception of signals, the transmission and reception of electric power,
Both can be realized wirelessly. As a result, the audio signal reproducing receiving unit is not restricted by the troublesome wiring and aesthetic appearance, etc., and the degree of freedom of arrangement is increased. Next, a signal processing method which is the same as that of the first embodiment but is different from that of the audio signal will be described. The audio signal input from the input terminal 2 is not processed by the transmission unit 1 but converted into a digital signal by the A / D conversion circuit 4 and set by the key input circuit 8 from outside the transmission unit 1 by the signal processing circuit A5. The control signal including the processed contents is superimposed on the audio signal and transmitted from the transmission circuit A9 via the modulation circuit A6.

The signal received by the receiving unit 13 is processed into an audio signal by the signal processing circuit B16. The processing contents described in the transmitting unit 1 are also described in the transmitting unit 1. Process. As an advantage in this case, the audio signal can be the same transmission data for each receiving unit. As a result, the transmission data amount of the audio signal can be reduced. However, although the data amount of the control signal slightly increases, the data amount can be significantly reduced as compared with the case where a dedicated audio signal is sent to a plurality of receiving units. That is, it is not necessary to transmit an audio signal dedicated to each receiving unit. In addition, since the total amount of data to be transmitted is reduced, restrictions on the data transmission speed and the signal processing speed can be relaxed.

FIG. 4 is a block diagram showing a basic configuration of a receiving unit 13 according to a second embodiment of the present invention. In FIG. 4, components equivalent to those in the previous embodiment are denoted by the same reference numerals. The description is omitted to avoid duplication (the same applies to the following embodiments). The second embodiment relates to the receiving unit 13 and aims at improving the efficiency of the reproduction of the audio signal, and is obtained by changing the components of the receiving unit 13 of the first embodiment. In FIG. 4, reference numeral 31 designates an audio signal as a PDM (Puls
A PDM modulation circuit for performing e-density modulation (modulation), and a pulse amplification circuit 32 for reproducing a PDM-modulated audio signal with a speaker. The audio signal amplified by the pulse amplification circuit 32 is reproduced by the speaker 21.

Here, the reproduction of the audio signal by PDM modulation is based on the fact that the power for driving the receiving unit is supplied wirelessly. That is, it is necessary to provide a highly efficient system in order to save as much power as possible to drive the control circuit in the receiving unit and the power supplied to the amplifier for driving the speaker 21. Therefore, it is realized by a PDM reproduction circuit having higher efficiency than an analog reproduction circuit using a conventional class A or class B amplifier circuit.

FIG. 5 is a block diagram showing a basic configuration of a receiving unit according to the third embodiment of the present invention. The transmitting unit 1 is constructed by adding components to the configuration of the first embodiment. This is the same as the first embodiment. In the figure, reference numeral 33 denotes a part setting switch for setting which part each receiving unit 13 takes charge of. The set value set by the part setting switch is stored in the control circuit B2.
0, and the part of the receiving unit 13 is determined. The receiving unit 13 in which the part has been determined controls the reproduced sound in accordance with the control signal transmitted from the transmitting unit 1.

In the third embodiment, the receiving unit 1
Since the part 3 has no part set in advance, the part setting can be freely set by the part setting switch. Furthermore, a variety of sound field spaces can be reproduced by the setting method, and addition or abolition of the receiving unit can be easily set. That is, each unit is for the rear L channel, R channel, mid L
Since the channels and the R channels are not set in advance, the units can be set when each unit is arranged, and the arrangement can be freely performed according to the installation location.

FIG. 6 is a block diagram showing a basic configuration of a receiving unit according to a fourth embodiment of the present invention. The transmitting unit 1 has a configuration in which components are added to the configuration of the first embodiment. This is the same as the first embodiment. In the figure, reference numeral 34 denotes a secondary battery for charging the electric power transmitted from the transmission unit 1. The rechargeable battery 34 is supplied from the rechargeable battery 34 when the power transmission state or the reception state deteriorates instantaneously or when the power supplied from the power supply circuit 25 becomes insufficient. In particular, in an amplifier circuit for driving a speaker, since power consumption generally changes greatly depending on the type and level of an audio signal, it is effective in stabilizing the entire system. As a result, even when the power supply is interrupted, the receiving unit 13 becomes unstable, and it is possible to prevent malfunction of the circuit in the receiving unit, interruption of the re-voice sound, generation of noise, and the like. Also, to charge the secondary battery 34,
When the power of the system is turned off, power for supplying to the secondary battery is sent for a certain period of time. The transmission time is usually set so as to supply power in one-hour units, so that the secondary batteries in each receiving unit can be charged, thereby simplifying the charging circuit.

FIGS. 7 and 8 are block diagrams showing a basic configuration of a receiving unit and a transmitting unit according to a fifth embodiment of the present invention, in which components are added to the configuration of the fourth embodiment. is there. In FIG. 7, reference numeral 35 denotes a backflow prevention circuit, which is a circuit for preventing a current from flowing from the secondary battery 34 to the solar battery 36. Reference numeral 37 denotes a charge amount detection circuit that detects the charge amount of the secondary battery 34. Reference numeral 38 denotes a modulation circuit C for transmitting data from the control circuit B20, that is, data of a detection level obtained by detecting the charge level of the secondary battery 34 and the like. Reference numeral 39 denotes a transmission circuit C for transmitting modulated charge level data. Next, in FIG.
Reference numeral 0 denotes a receiving circuit C that receives data on the amount of charge of the secondary battery from the receiving unit 13. A demodulation circuit 41 demodulates data received by the reception circuit C.

The operation of the additional components will now be described. The solar battery 36 connected to the secondary battery 34 via the backflow prevention circuit 35 does not supply power from the transmission unit, or the receiving system 13 is off, and the voltage of the secondary battery 34 has dropped below the specified voltage. It is configured such that the solar cell can be charged when it can generate power. This is effective when there is no power source for charging the secondary battery 34 such as when the user is away from home for a long time or when the system is not used for a long time. Also, when the system is started up from the off state and the control signal is received from the transmitting unit, if the receiving circuit A14, the demodulating circuit A15 and the control circuit B20 in the receiving unit 13 are in the standby state, the whole system can be smoothly operated. It is possible to start up. This is based on the condition that the control circuit B20 for start-up is always operating, and power can be supplied to these circuits from the secondary battery 34 and the solar battery 36.

Next, the analog amount of the state of charge of the secondary battery 34 is input to an A / D (analog / digital) conversion circuit 42, and the A / D conversion circuit 42 converts the state of charge to digital and detects the amount of charge. Input to the circuit 37. The control circuit B20 determines the detection level of the state of charge detected by the charge amount detection circuit 37.
To enter. The detection level input to the control circuit B20 is converted into serial data, and is modulated by the modulation circuit C38.
Output from the transmission circuit C39.

The signal of the detection level transmitted from the transmitting circuit C39 in the receiving unit 13 is received by the receiving circuit C40 in the transmitting unit 1. The data received by the receiving circuit C40 is demodulated by the demodulating circuit C41 and input to the control circuit A7. The transmission unit 1 and the reception unit 13 are controlled based on the detection level data input to the control circuit A7. In the transmitting unit 1, it is determined whether or not to continue the power transmission based on the charging state data of the secondary battery 34 in the receiving unit 13. When the transmission of power is continued, the current state is continued. When the transmission of power is stopped, the power supply circuit 10, the transmission circuit A9, and the transmission circuit B12 are controlled, and the receiving unit 13 is controlled by a control signal from the transmission circuit A9. Put each circuit in standby state,
All transmission / reception from the transmission unit 1 is stopped, and each circuit in the transmission unit 1 is set to a standby state or a part of the circuits is turned off. As a result, the entire system can be mechanically turned off by a key input when the use of the system is completed without worrying about the remaining amount of the secondary battery in the receiving unit.

[0061]

As described above, according to the wireless transmission / reception system according to the first aspect, the transmission output dedicated to each receiving unit becomes unnecessary. That is, in order to support a plurality of receiving units, it is necessary to reproduce an audio signal assigned to each receiving unit by a control signal even if the transmitting unit corresponding to each receiving unit does not have a dedicated modulation circuit or a transmitting circuit. Can be done. Also, the connection between the receiving units is not required, and the transmission of the power is transmitted wirelessly, whereby the transmission of the audio signal and the power can be made wireless. This wireless connection increases the degree of freedom in arranging each unit of the reproduction system and releases the user from complicated wiring work.

According to the wireless transmission / reception system of the second aspect, by compressing the audio signal to be transmitted and reducing the data amount of the transmission signal, the transmission speed in the transmission unit and the signal processing speed in each reception unit are reduced. Be relaxed. According to the wireless transmission / reception system according to the third aspect, by transmitting light as a carrier, it is possible to clearly distinguish the power transmission type from the power transmission type. This can prevent mutual interference between the audio signal and the power transmission signal. In addition, a wireless transmission / reception system can be configured by transmitting signals only in a room, and is a signal that is not required except in a room where the system is configured. Therefore, if the light has strong directivity and the property that the reach is limited by an obstacle is used, the output level of the transmission output can be easily set.

According to the fourth aspect of the present invention, the setting means for setting the part of the receiving unit sets the part of the receiving unit, thereby setting the part based on the control signal sent from the transmitting unit. Audio signal can be reproduced. Thus, when the receiving units are arranged, they are not preset in advance, so that the parts can be set by the switches after the arrangement, and the degree of freedom in setting is further expanded.

According to the fifth aspect of the present invention, the transmission of the audio signal and the transmission of the power are separated from each other, so that the audio signal and the power transmission signal are not affected by the intermodulation. In addition, since the start and stop of transmission can be independently controlled, the control range of the entire system can be expanded. According to the wireless transmission / reception system of the sixth aspect, the power consumption when the audio signal is reproduced by the receiving unit corresponds to the driving power of the reproduction circuit. Is desirable. In other words, the weight, the heat radiation shape, and the mounting area can be reduced by adopting a high-rate system. To prevent the temperature inside the unit from rising,
The speaker driving circuit can be provided together with the speaker.

According to the wireless transmission / reception system according to the seventh aspect, by charging the received power to the secondary battery, stable power can be supplied in both cases of low power consumption and high power consumption. . Further, even when the power transmission is off, power for standby can be supplied from the secondary battery. Even when power supply is insufficient due to variations in the power transmission circuit, the power can be supplied from the secondary battery, and the entire circuit can be protected from abnormal operation. According to the wireless transmission / reception system according to claim 8, by charging the secondary battery from the solar battery, it is possible to supply the power consumed during standby, and when the battery is absent or unused for a long time, This power can prevent consumption of the secondary battery.

According to the wireless transmission / reception system of the ninth aspect, by transmitting power in a wide directivity, the transmission output is not output in a specific direction. There is no need to consider the receiving position. Thereby, the degree of freedom when arranging the receiving units can be expanded. According to the wireless transmission / reception system according to claim 10, when the power of the system is turned off, that is, when the power of the transmission unit and the reception unit is turned off, instead of turning off both units simultaneously, a time difference is set. Hold and turn off. That is, by transmitting the power-off control signal from the transmission unit, turning off the reception unit, and then turning off the transmission unit, the reception unit remains in the power-on state without receiving the power-off control signal. Can be prevented. Further, it is possible to prevent the reception unit from reproducing noise when the power of the transmission unit is turned off.

According to the wireless transmission / reception system of the eleventh aspect, when the power supply of the system is turned off, the second transmission means and the second reception means are in an on state until the secondary battery is fully charged. And the second transmitting means and the second receiving means are turned off after the full charge is completed, so that the receiving unit can keep the standby state long even if the transmitting unit is turned off.

According to the wireless transmission / reception system of the twelfth aspect, when the power of the system is turned on, the power is turned on by giving a difference between the transmission timings of the first transmission means and the second transmission means. Accordingly, the receiving side can receive the audio signal and the control signal in a stable state. That is, the power is transmitted from the second transmitting means for supplying power, the power of the receiving side is stabilized first, and then the audio signal and the control signal are received from the first transmitting means when the receiving circuit is stabilized. Since the transmission of the control signal is started, the signal can be stably received.

[Brief description of the drawings]

FIG. 1 is a block diagram of an overall system according to a first embodiment of this invention.

FIG. 2 is a block diagram of a transmission unit according to the first embodiment.

FIG. 3 is a block diagram of a receiving unit according to the first embodiment.

FIG. 4 is a block diagram of a receiving unit according to a second embodiment.

FIG. 5 is a block diagram of a receiving unit according to a third embodiment.

FIG. 6 is a block diagram of a receiving unit according to a fourth embodiment.

FIG. 7 is a block diagram of a receiving unit according to a fifth embodiment.

FIG. 8 is a block diagram of a transmission unit according to a fifth embodiment.

FIG. 9 is a configuration diagram of transmission data according to the first embodiment.

[Explanation of symbols]

 Reference Signs List 1 transmission unit 2 input terminal 3 A / D determination circuit 4 A / D conversion circuit 5 signal processing circuit A 6 modulation circuit A 7 control circuit A 8 key input circuit 9 transmission circuit A 10 power supply circuit 11 modulation circuit B 12 transmission circuit B 13 receiving unit 14 receiving circuit A 15 demodulating circuit A 16 signal processing circuit B 17 D / A converting circuit 18 amplifying circuit 19 memory circuit 20 control circuit B 21 speaker 22 receiving circuit B 23 demodulating circuit B 25 power supply circuit 26 audio signal + Control signal transmission signal 27 Power transmission signal 31 PDM modulation circuit 32 Pulse amplification circuit 33 Part setting switch 34 Secondary battery 35 Backflow prevention circuit 36 Solar cell 37 Charge detection circuit 38 Modulation circuit C 39 Transmission circuit C 40 Receiving circuit C 41 demodulation circuit C 42 A / D conversion circuit

Claims (12)

[Claims] 1. A wireless transmission / reception system comprising: a transmission unit having a first transmission unit and a second transmission unit; and a plurality of reception units having a first reception unit and a second reception unit. The first transmitting means superimposes a control signal for controlling the receiving unit on the audio signal and transmits the signal. The first receiving means receives the signal transmitted from the first transmitting means. The second transmitting means transmits the power for driving the first receiving means by electromagnetic waves, and the second receiving means receives the power transmitted from the second transmitting means. Wireless transmission and reception system. 2. The audio signal transmitted by the first transmission means is a compressed signal.
The wireless transmission and reception system as described. 3. The wireless transmission / reception system according to claim 1, wherein the first transmission means transmits light as a carrier wave. 4. The wireless transmitting / receiving system according to claim 1, wherein the receiving unit includes a setting unit for setting a part of the receiving unit. 5. The wireless transmitting / receiving system according to claim 1, wherein the first transmitting means and the second transmitting means are different. 6. The wireless device according to claim 1, wherein the receiving unit includes a PDM modulator that performs PDM modulation on the audio signal received by the first receiving unit, and reproduces the PDM modulated signal. Transmission / reception system. 7. The wireless transmitting / receiving system according to claim 1, wherein the receiving unit includes charging means for charging the secondary battery with the power received by the second receiving means. 8. The wireless transmission / reception system according to claim 7, wherein said charging means charges a secondary battery from a solar cell as an auxiliary power supply. 9. The wireless transmission / reception system according to claim 1, wherein the second transmission means has a wide directivity capable of transmitting power to the plurality of reception units. 10. The transmission unit transmits a power-off control signal to the reception unit when the wireless transmission / reception system is powered off, and after a time corresponding to a time for ending the power-off operation of the reception unit has elapsed. ,
2. The wireless transmission / reception system according to claim 1, wherein the power supply is turned off. 11. A control unit for detecting a charge amount of the secondary battery when a power supply of the wireless transmission / reception system is turned off, and turning off a second transmission unit and a second reception unit based on the charge amount. The wireless transmission / reception system according to claim 7 or 10, wherein: 12. The wireless communication system according to claim 1, further comprising control means for providing a difference between the transmission start times of the first transmission means and the second transmission means when the power supply of the wireless transmission / reception system is turned on. Wireless transmission and reception system.