KR101087082B1 - Wireless speaker and wireless speaker system - Google Patents

Abstract

PURPOSE: A wireless speaker and a wireless speaker system are provided to eliminate confusion between signals by transmitting an audio signal and a data signal using an FM mode. CONSTITUTION: A wireless speaker module(100) comprises an audio receiver(110), an audio mixer(150), an audio amplifier(160), and main controller(170). The audio receiver receives an FM(Frequency Modulation) signal which is transmitted from an audio transmitter connected to an audio generator. The audio receiver creates a data signal, a main controller enable signal, a first audio signal, and a second audio signal. The audio receiver comprises a data transmitter-receiver(120), a first audio receiver(130), and a second audio receiver(140). The audio amplifier outputs sound by amplifying an audio output signal.

Description

Wireless speaker and wireless speaker system {WIRELESS SPEAKER AND WIRELESS SPEAKER SYSTEM}

The present invention relates to a wireless speaker, and more particularly, to a wireless speaker and a wireless speaker system for transmitting an audio signal and a data signal in an FM manner.

As the multimedia industry enters the digital age, the demand for home theater systems such as 5.1-channels is increasing greatly according to the user's demand for clearer, clearer images and lively sound effects. 5.1 channels are the number of channels used when encoding audio signals, 5 is the center speaker, the front left and right speakers, and the rear left and right speakers, and 1 refers to the bass dedicated sound effect channel. In general, audio generators, such as audio systems (aka, audio), various TVs, DVDs, and various computers, output sound through speakers. These audio generators may be manufactured independently but may be manufactured independently. In some cases, the speaker is designed to be connected to the main body of the audio generator by wire.

However, such a conventional wired speaker system has a limitation in the arrangement distance from the main body, etc., since the speaker must be wired to the main body of the audio generator, therefore, there is a difficulty in placing or installing the speaker in a desired position. In particular, in the case of a home theater system that implements a 5.1 channel, the wired speaker system has a problem of complicated wiring.

Accordingly, a wireless speaker system has been devised, and wireless LAN (WLAN), Bluetooth, infrared, binary CDMA (Binary CDMA) and the like have been proposed as a technology for transmitting signals. However, since the WLAN method uses a frequency band of 2400 MHz to 2487 MHz, many channels cannot be used (up to 8 to 10), and the wavelength is very short, which causes a problem that signals are easily disconnected due to surrounding obstacles. In addition, since Bluetooth and WLAN methods use a random hopping method, there are many collisions between signals, and the infrared method has limitations in reception due to the reception direction, angle, and obstacle intervention of the signal. On the other hand, binary CDMA technology has no channel-to-channel hopping, so there is no crosstalk between signals when used in a narrow space. However, when applied to a real wireless speaker system, crosstalk between the signals often occurs when six or more channels are used. Therefore, there is a limit to accepting signals from two or more audio generators, making it difficult to commercialize. Accordingly, there is a need for a wireless speaker system using a signal transmission method that can accommodate multi-channels and eliminate signal interruptions.

One object of the present invention for solving the above problems is to provide a wireless speaker that performs stable wireless communication without crosstalk between signals by transmitting an audio signal and a data signal using the FM scheme.

Another object of the present invention is to provide a wireless speaker system implemented with the wireless speakers.

However, the problem to be solved of the present invention is not limited thereto, and may be variously expanded within a range without departing from the spirit and scope of the present invention.

In order to achieve the above object, a wireless speaker module according to an embodiment of the present invention receives an FM signal transmitted from an audio transmitter to receive a data signal, a main controller activation signal, a first audio signal, and a second audio signal. An audio receiver for generating, an audio mixer for receiving and mixing the first and second audio signals to generate an audio output signal, an audio amplifier for receiving and amplifying the audio output signal and outputting sound, and the data signal And a main controller configured to generate an audio activation signal based on the main controller activation signal and to control the audio receiver, the audio mixer, and the audio amplifier.

According to embodiments of the wireless speaker module, the audio receiver detects a sound source identification signal included in the FM signal, and identifies the source of the sound source, the data transceiver for generating the main controller activation signal and the data signal, the A first audio receiver activated based on an audio activation signal and receiving a first sound source signal included in the FM signal to generate the first audio signal, and activated based on the audio activation signal and included in the FM signal. It may include a second audio receiver for receiving a second sound source signal to generate the second audio signal.

According to embodiments of the wireless speaker module, the data transceiver is a duplexer (duplexer) for receiving the FM signal through an antenna, the FM signal from the duplexer and demodulates the FM signal (demodulate) after the sound source An FM receiver for generating an encoded data signal by filtering a band including an identification signal, and a data decoder for receiving the encoded data signal and decoding the encoded data signal to generate the data signal. Can be.

According to embodiments of the wireless speaker module, the main controller transmits a control signal to the first audio receiver and the second audio receiver based on the data signal. At least one receives the FM signal, sends an output selection signal to the audio mixer to select at least one of the first audio signal and the second audio signal, and transmits an amplifier control signal to the audio amplifier. The power supply of the audio amplifier can be controlled.

According to embodiments of the wireless speaker module, the wireless speaker module may further include a multi-battery system for supplying driving power to the audio receiver, the audio mixer, the audio amplifier, and the main controller.

According to embodiments of the wireless speaker module, the multi-battery system generates a battery confirmation signal indicating a detached state of the battery by comparing the output voltage level of the battery with a preset confirmation voltage level, respectively, and output voltage level of the battery. A plurality of battery units generating first and second battery discharge signals indicating whether the battery is discharged by comparing with a preset first discharge voltage level and a second discharge voltage level lower than the first discharge voltage level; A battery comparator for generating a battery comparison signal by comparing the output voltage levels of the batteries detected from the battery parts with each other, a battery control signal based on the battery confirmation signal, the first and second battery discharge signals, and the battery comparison signal. Power control unit for generating a, based on the battery control signal Selects a battery provided in one of the battery units as a power supply battery to supply the driving power, and the batteries provided in the plurality of battery units based on the plurality of battery charging voltages, respectively. And a battery charger configured to charge a non-powered battery that is not selected as the power supply battery.

According to embodiments of the wireless speaker module, the power supply battery may be changed in an overlap period in which an activation section of the first battery discharge signal and an inactivation section of the second battery discharge signal overlap.

According to embodiments of the wireless speaker module, the data transceiver is activated by always receiving the driving power from the multi-battery system, the first audio receiver and the second audio receiver selectively from the multi-battery system The driving power may be supplied and activated.

According to embodiments of the wireless speaker module, when the data transceiver detects an FM signal including the sound source identification signal among the surrounding FM signals, generates the main controller activation signal to generate the multi-battery system. And the multi-battery system activates the main controller, the main controller generates and transmits the audio activation signal to the multi-battery system, and the multi-battery system sends the first audio receiver and the second audio. When the driving power is supplied to the receiver and activated, and if it does not detect the FM signal including the sound source identification signal among the surrounding FM signals, the transmission of the main controller activation signal is stopped, and the multi-battery system The driving power ball A it can be stopped by disabling the main controller, the receiver first audio and the second audio receiver.

Wireless speaker system according to an embodiment of the present invention for achieving the above object is at least one audio generator for generating a different sound source signal, respectively connected to each of the audio generator to receive the sound source signal, It may include at least one audio transmitter, and a plurality of wireless speaker module for generating each FM signal including a sound source signal.

According to embodiments of the wireless speaker system, each of the audio transmitters has a unique identification (ID) to generate a corresponding sound source identification signal, and the sound source signal received from each of the audio generators; The FM signal may be combined to generate an FM signal, and the empty FM signal band may be scanned to find an empty band, and the FM signal may be transmitted using the FM signal.

According to embodiments of the wireless speaker system, each of the audio transmitter is a data encoder for generating a sound source identification signal by encoding a text signal corresponding to the ID, receiving the sound source identification signal from the data encoder And an FM transmitter for receiving the sound source signal from the audio generator, combining and modulating the two signals to generate the FM signal, and a duplexer for receiving the FM signal and transmitting the FM signal through an antenna. It may include.

The wireless speaker according to the embodiments of the present invention can perform stable wireless communication without crosstalk between signals by transmitting an audio signal and a data signal using the FM scheme.

According to the embodiments of the present invention as described above, it is possible to implement a high quality wireless speaker system at low power.

However, the effects of the present invention are not limited thereto, and may be variously extended within a range without departing from the spirit and scope of the present invention.

1 is a block diagram illustrating a wireless speaker module according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless speaker system according to an exemplary embodiment of the present invention.
3A is a diagram illustrating a frequency spectrum of a sound source signal and a sound source identification signal before being modulated.
3B is a diagram illustrating a frequency spectrum of an FM signal.
3C is a diagram illustrating a frequency spectrum of the first sound source signal and the first sound source identification signal after demodulation.
4 is a block diagram illustrating an example of a data transceiver included in the wireless speaker module of FIG. 1.
5 is a block diagram illustrating an example of a multi-battery system included in the wireless speaker module of FIG. 1.
6 is a block diagram illustrating an example of a battery unit included in the multi-battery system of FIG. 5.
7 is a diagram illustrating an example of a 5.1-channel home theater system to which the wireless speaker system is applied.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous modifications, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. .

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a block diagram illustrating a wireless speaker module according to an embodiment of the present invention. 2 is a block diagram illustrating a wireless speaker system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the wireless speaker module 100 may include an audio receiver 110, an audio mixer 150, an audio amplifier 160, and a main controller 170. The audio receiver 110 may include a data transceiver 120, a first audio receiver 130, and a second audio receiver 140. According to an embodiment, the wireless speaker module 100 may further include a multi battery system 180.

Referring to FIG. 2, the wireless speaker system 200 includes at least one audio generator 230_1, 230_2,..., 230_n, at least one audio transmitters 210_1, 210_2,..., 210_n, and a plurality of radios. Speaker modules 100_1, 100_2,..., 100_n may be included.

The audio receiver 110 receives the FM signal transmitted from the audio transmitters 210_1, 210_2,..., 210_n connected to the audio generators 230_1, 230_2,..., 230_n to receive the data signal DATA and the main controller activation signal ( ACT_MC, first audio signals L_OUT1 and R_OUT1, and second audio signals L_OUT2 and R_OUT2 are generated. According to an embodiment of the present invention, the audio transmitters 210_1, 210_2,..., 210_n connected to the audio generators 230_1, 230_2,..., 230_n each have unique IDs. Each of the sound source identification signals corresponding to can be generated. Therefore, the sound source identification signal is a data signal including a small amount of text. The data signal is present in the 40-50 KHz band. Since the data signal can be transmitted along with the FM radio wave having the 30 to 300 MHz band using the FM method, the FM signal is generated by combining the sound source identification signal with the sound source signals received from the respective audio generators, The speaker module 100 may transmit the same. Then, the wireless speaker module 100 may receive the FM signal, identify the source of the sound source, and restore the sound source signal to output the sound AUDIBLE_SIG.

Hereinafter, the operation of the wireless speaker module 100 will be described in detail with reference to FIGS. 1 and 2.

The data transceiver 120 included in the audio receiver 110 is activated by receiving the driving power POWER_ANY from the multi-battery system 180 at all times, and the first audio receiver 130 and the second audio receiver 140 are activated. The driving power POWER_BAT may be selectively supplied from the multi-battery system 180 to be activated. An internal configuration of the data transceiver 120 will be described later with reference to FIG. 4.

When the audio generators 230_1, 230_2,..., 230_n are operated, a sound source signal is transmitted to the audio transmitters 210_1, 210_2,..., 210_n connected to the audio generators 230_1, 230_2,..., 230_n, and audio. Each of the transmitters 210_1, 210_2,..., 210_n combines the sound source identification signal corresponding to its own ID and the sound source signal to generate an FM signal and transmits the same through an antenna. The active data transceiver 120 continuously detects surrounding FM signals. When the data transceiver 120 detects an FM signal including the sound source identification signal among the surrounding FM signals, the other elements 130, 140, 150, 160, and 170 are activated. In detail, when the sound source identification signal is detected, the data transceiver 120 generates a main controller activation signal ACT_MC and transmits it to the multi-battery system 180. Then, the multi-battery system 180 supplies the driving power POWER_ACT to the main controller 170. At the same time, the data transceiver 120 converts the received sound source identification signal to generate a data signal DATA and transmits the data signal DATA to the main controller 170. The activated main controller 170 instructs the multi-battery system 180 to activate the remaining elements. In detail, the main controller 170 generates an audio activation signal ACT and transmits the generated audio activation signal ACT to the multi-battery system 180. The multi-battery system 180 supplies the driving power POWER_BAT to the first audio receiver 130 and the first audio receiver 130. 2 to the audio receiver 140, the audio mixer 150, and the audio amplifier 160.

According to an embodiment, the activated first audio receiver 130 and the second audio receiver 140 may receive the assigned FM signals. In this case, each of the audio receivers 130 and 140 may correspond to different audio generators 230_1, 230_2,..., 230_n. For example, when only one audio generator 230_1 is operated, only the first audio receiver 130 may operate to receive a sound source signal generated by the audio generator 230_1. In addition, when two audio generators 230_1 and 230_2, for example, simultaneously operate a laptop and audio, the first audio receiver 130 receives a sound source signal generated by the first audio generator 230_1 The audio receiver 140 may receive a sound source signal generated by the second audio generator 230_2. When one audio generator 230_1 is operated in the wireless speaker system 200, the first audio receiver 130 receives the FM signal including the sound source signal and demodulates the demodulated signal on FM radio waves. The sound source signal is extracted and the audio signals L_OUT1 and R_OUT1 are generated based on the sound source signal. The left audio signal L_OUT1 and the right audio signal R_OUT1 may be appropriately used according to the nature of the transmitted sound source signal.

For example, when only one wireless speaker module 100 is used, the left audio signal L_OUT1 and the right audio signal R_OUT2 are both emitted, and when the two wireless speaker modules 100 are used, one wireless speaker module is used. A stereo system may be implemented by exporting only the left audio signal L_OUT1 at 100 and only the right audio signal R_OUT1 at another wireless speaker module 100. Thereafter, the audio signals L_OUT1 and R_OUT1 are transmitted to the audio mixer 150.

When the two audio generators are operated as described above, the audio mixer 150 operates the first audio signal 130 so that the first audio receiver 130 and the second audio receiver 140 respectively receive different sound source signals. When generating the L_OUT1 and R_OUT1 and the second audio signal L_OUT2 and R_OUT2, respectively, the plurality of audio signals L_OUT1, R_OUT1, L_OUT2 and R_OUT2 may be selectively mixed to output the mixed sound AUDIBLE_SIG. .

In more detail, only one of the first audio signals L_OUT1 and R_OUT1 and the second audio signals L_OUT2 and R_OUT2 may be output or may be mixed and output. This may be controlled by the main controller 170. In more detail, the main controller 170 may select an audio signal to be output by transmitting an output selection signal AUDIO_SEL to the audio mixer 150. Meanwhile, although FIG. 1 illustrates that the audio receiver 110 includes only the first audio receiver 130 and the second audio receiver 140 as audio receivers, the audio receiver 110 may include two or more audio receivers. Can be. As a result, the sound AUDIBLE_SIG may be output by receiving the sound source signals from the two or more audio generators 230_1, 230_2,..., 230_n or by mixing a plurality of sound source signals through the audio mixer 150. . That is, according to the exemplary embodiment, the wireless speaker system 200 may include one-to-many or many-to-many between the audio generators 230_1, 230_2,..., 230_n and the wireless speaker modules 100_1, 100_2,..., 100_n. Implementation is possible.

As an embodiment, the present invention may be usefully used in places where various sound sources are used simultaneously. For example, the present invention can be used in a venue such as a singer's voice signal, accompaniment signal, musical instrument signal, and the like. The audio mixer 150 selects or mixes the audio signals L_OUT1, R_OUT1, L_OUT2, and R_OUT2 to generate the audio output signals L_OUT and R_OUT and transmits them to the audio amplifier 160.

The audio amplifier 160 amplifies the audio output signals L_OUT and R_OUT to output the sound AUDIBLE_SIG. The main controller 170 may control the power of the audio amplifier 160 by transmitting the amplifier control signal AMP_CON to the audio amplifier 160. Specifically, when the setting related to the operation of the speaker is changed, for example, the audio signal (L_OUT1, R_OUT1, L_OUT2, R_OUT2) to be output from the audio mixer 150 is newly mixed, or the volume of the sound (AUDIBLE_SIG) to be output is adjusted. In the case of the change, the main controller 170 cuts off the power supply applied to the audio amplifier 160 until the setting change is completed. When the setting change is completed, the main controller 170 activates the audio amplifier 160 to generate a sound (AUDIBLE_SIG). You can output

According to an embodiment, the main controller 170 may be a microcomputer having a microprocessor or the like. The user may set a volume control by using a remote controller or directly operating a speaker, and the wireless speaker module 100 may perform this through the main controller 170. In one embodiment, the remote control may communicate with the wireless speaker in an FM manner. That is, the data transceiver 120 of the wireless speaker module 100 may be used as the receiver of the remote controller. When the setting is changed through the remote controller, a signal is transmitted as a data signal in an FM manner, and the wireless speaker module 100 performs this through the main controller 170. Implementing the remote control by the FM method has the advantage of less signal reception constraints than the infrared remote control.

When the operation of the audio generators 230_1, 230_2,..., 230_n is stopped, that is, when the wireless speaker module 100 does not detect an FM signal including a sound source identification signal among the surrounding FM signals, the data transceiver ( 120 may stop transmission of the main controller activation signal ACT_MC. Then, the multi-battery system 180 stops supplying the driving powers POWER_BAT and POWER_MC so that the main controller 170, the first audio receiver 130, the second audio receiver 140, the audio mixer 150, and the audio are stopped. The amplifier 160 may be deactivated. As a result, when the audio generators 230_1, 230_2,..., 230_n are not operated, only the data transceiver 120 of the elements included in the wireless speaker module 100 is turned on and the other elements 130, 140, 150, 160, 170 are turned off. As a result, when the wireless speaker module 100 is not used, unnecessary power consumption may be eliminated using only minimal power. The wireless speaker module 100 according to an embodiment of the present invention can wirelessly operate with the audio generators 230_1, 230_2,..., 230_n, and receive stable power through the multi-battery system 180 therein. This eliminates the need for power supply wiring (AC lines), eliminating the need for an electrical outlet.

3A to 3C are diagrams showing frequency spectra of a sound source signal, a sound source identification signal, and an FM signal.

3A is a diagram illustrating a frequency spectrum of a sound source signal and a sound source identification signal before being modulated. That is, the frequency spectrum (amplitude) of the sound source signal and the sound source identification signal before being modulated by the audio transmitter is schematically shown. Hereinafter, a signal transmission method in the wireless speaker system 200 will be described with reference to FIGS. 3A to 3C.

Referring to FIG. 3A, the first sound source spectrum S1 represents the frequency spectrum of the first sound source signal generated by the first audio generator 230_1, and the second sound source spectrum S2 represents the second audio generator 230_2. ) Represents the frequency spectrum of the second sound source signal. The first data spectrum D1 represents the frequency spectrum of the first sound source identification signal generated by the first audio transmitter 210_1, and the second data spectrum D2 represents the second sound source generated by the second audio transmitter 210_2. Indicates the frequency spectrum of the identification signal. Accordingly, the first data spectrum D1 corresponds to the unique ID of the first audio transmitter 210_1 and the second data spectrum D2 corresponds to the unique ID of the second audio transmitter 210_2. Waveforms D1N and D2N on the left represent the frequency spectrums of sound generated as a result of Fourier transform of the first sound source signal and the second sound source signal, respectively. For convenience, explanation of negative frequency spectra is omitted for convenience.

When the audio generators 230_1 and 230_2 are operated, a sound source signal is generated. Since the sound source signal corresponds to music or TV broadcasting, the sound source signal may have an audible frequency band (20 Hz to 20 KHz). The sound source band SOUND_BAND of FIG. 3A corresponds to the audio frequency band. The first sound source spectrum S1 and the second sound source spectrum S2 correspond to sound source signals generated by different audio generators 230_1 and 230_2, respectively, and thus have different waveforms. According to an exemplary embodiment, the sound source spectra S1 and S2 may have various waveforms according to the type of sound in a band within 20 KHz. Thereafter, the audio generators 230_1 and 230_2 transmit respective sound source signals to the connected audio transmitters 210_1 and 210_2, respectively. Each of the audio transmitters 210_1 and 210_2 may have a unique ID and generate a sound source identification signal corresponding thereto. The sound source identification signal is a data signal including a small amount of text and may be located between about 40 to 50 kHz in the frequency band. The data band DATA_BAND of FIG. 3A may be a band in which the sound source identification signals are located. The first data spectrum D1 located in the data band DATA_BAND represents the frequency spectrum of the first sound source identification signal generated by the first audio transmitter 210_1, and the second data spectrum D2 represents the second audio transmitter ( A frequency spectrum of the second sound source identification signal generated at 210_2). Finally, the first audio transmitter 210_1 combines and modulates the first sound source signal and the first sound source identification signal to generate a first FM signal, and the second audio transmitter 210_2 generates the second FM signal. A second FM signal is generated by combining and modulating a sound source signal and the second sound source identification signal. The first and second FM signals will be described later with reference to FIG. 3B.

Hereinafter, IDs of the audio transmitters 210_1, 210_2,..., And 210_n will be described.

Each of the audio transmitters 210_1, 210_2,..., 210_n may have a unique ID. For example, the first audio transmitter 210_1 may have an ID that can be identified with another audio transmitter such as '1' and the second audio transmitter 210_2 may have a '2'. The ID corresponds to a small amount of text, and each sound source identification signal corresponding to the ID has a different waveform according to ID information included. Accordingly, the frequency spectrum of the sound source identification signal also occupies different frequency bands. The data band DATA_BAND of FIG. 3A corresponds to about 40 to 50 KHz, and when divided into a narrow band, a plurality of channels may be included. Accordingly, a plurality of audio transmitters 210_1, 210_2,..., 210_n having different IDs may be assigned different channels, and accordingly, the wireless speaker system 200 may transmit a plurality of audio transmitters 210_1, 210_2,... , 210_n) can be operated at once. In addition, since the audio receivers 130 and 140 of the wireless speaker module 100 receive the FM signal including the specific ID according to the instruction of the main controller 170, crosstalk between signals does not occur.

In one embodiment, when the user newly installs and operates the wireless speaker system 200, any of the wireless speaker modules 100_1, 100_2,..., 100_n detects the audio transmitters 210_1, 210_2,..., 210_n. In this case, the user may set the wireless speaker modules 100_1, 100_2,..., 100_n to receive signals from the audio transmitters 210_1, 210_2,..., 210_n through an input device such as a remote controller. For example, the IDs of the audio transmitters 210_1, 210_2,..., And 210_n may be registered in the wireless speaker modules 100_1, 100_2,..., And 100_n, and the audio transmitters 210_1, 210_2,..., 210_n that are registered once may be registered. In the future, the wireless communication may be performed without additional setting. In one embodiment, a security system may be provided by inputting a unique password assigned to each of the audio transmitters 210_1, 210_2,..., 210_n during the initial setting. As a result, it can be isolated from other wireless speaker systems, such as audio transmitters used in neighboring houses. According to an embodiment, the above-described identification mechanism may be extended to other electronic devices. For example, a signal transceiver may be connected or embedded in a car navigation system, a home refrigerator, an air conditioner, or the like. As a result, wireless communication may be performed using FM signals between electronic devices or between electronic devices and a remote controller, and ultimately, a ubiquitous system may be realized.

3B is a diagram illustrating a frequency spectrum of an FM signal. That is, the frequency spectrum of the FM signal generated by combining and modulating the sound source signal and the sound source identification signal of FIG. 3A is schematically shown.

Referring to FIG. 3B, the first FM spectrum CH1 represents the frequency spectrum of the first FM signal generated by combining and modulating the first sound source signal and the first sound source identification signal in the first audio transmitter 210_1. . The second FM spectrum CH2 represents a frequency spectrum of the second FM signal generated by combining and modulating the second sound source signal and the second sound source identification signal in the second audio transmitter 210_2. The signal transmission method of the present invention may be substantially the same principle as the FM radio broadcast. As shown in FIG. 3A, since the sound source signals and the sound source identification signals have a low frequency of the KHz band, a signal having a high frequency is used to transmit a signal for ease of transmission. Specifically, each of the audio transmitters 210_1, 210_2, ..., 210_n has a unique ID and generates a sound source identification signal corresponding thereto, and the sound source signals received from the respective audio generators 230_1, 230_2, ..., 230_n. After combined with and loaded on the carrier to generate the FM signal.

In this case, each audio transmitter 210_1, 210_2,..., 210_n first scans an adjacent FM signal band to find an empty band and uses a carrier wave falling into the band. Although FIG. 3B shows that the first FM spectrum CH1 is in a higher frequency band than the second spectrum CH2, this is one example and may use any frequency within the FM signal band when transmitting the FM signal. Thereafter, the audio receivers 130 and 140 of each of the wireless speaker modules 100 may receive the allocated FM signals according to the instructions of the main controller 170. For example, the first audio receiver 130 may receive the first FM signal according to the instruction of the main controller 170. In this case, as illustrated in FIG. 3B, the first FM signal may be filtered by a tuner inside the first audio receiver 130. The tuner acts like a band pass filter.

Since the FM broadcast frequency is around 100MHz, the frequency band can be widely used, and the frequency interval of radio waves necessary to avoid interference between broadcasting stations is also large enough. For reference, if the medium wave needs 10KHz at a frequency interval for 1,000KHz, the ultra-short wave is 1MHz for 100MHz. This is why the FM method is adopted in microwave broadcasting. FM broadcasts use the 30MHz to 300MHz band. The FM band FM_BAND of FIG. 3B corresponds to the FM broadcast band. As described above, the FM signal transmission method used by the wireless speaker system 200 of the present invention uses a relatively wide band, and thus there are many unused carrier signals, thereby enabling fast and stable wireless communication without crosstalk between signals. .

3C is a diagram illustrating a frequency spectrum of the first sound source signal and the first sound source identification signal after demodulation. That is, the frequency spectrum of the first sound source signal and the first sound source identification signal after demodulation in the audio receiver is schematically shown.

Referring to FIG. 3C, the third sound source spectrum S3 represents the frequency spectrum of the first sound source signal reconstructed from the first FM signal, and the third data spectrum D3 is the first signal reconstructed from the first FM signal. Indicates the frequency spectrum of the sound source identification signal. In an embodiment, it is assumed that only the first FM signal corresponding to the first FM spectrum CH1 of FIG. 3B is selected to be received. Accordingly, FIG. 3C illustrates a frequency spectrum when only the first FM signal is received and restored. Indicates. However, this is only one example, and according to an embodiment, the second FM signal or both the first and second FM signals may be received, and accordingly, the shape of the frequency spectrum of FIG. 3C may vary. The third sound source spectrum S3 of FIG. 3C and the first sound source spectrum S1 of FIG. 3A may correspond to substantially the same signal. In addition, the third data spectrum D3 of FIG. 3C and the first data spectrum D1 of FIG. 3A may correspond to substantially the same signal. In other words, the first sound source spectrum S1 represents the frequency spectrum of the first sound source signal generated by the first audio generator 230_1, and the third sound source spectrum S3 transmits the first sound source signal wirelessly. And a frequency spectrum of the first sound source signal, which is received by any audio receiver 130 or 140 of any wireless speaker module 100 and then restored through frequency filtering and demodulation. In addition, the first data spectrum D1 represents the frequency spectrum of the first sound source identification signal generated by the first audio transmitter 210_1, and the third data spectrum D3 indicates that the first sound source identification signal is wirelessly transmitted. The frequency spectrum of the first sound source identification signal received by the data transceiver 120 of the wireless speaker module 100 and then restored through frequency filtering and demodulation is shown.

The restored first sound source signal and the restored first sound source identification signal are each processed by different elements. The data transceiver 120 activated in any wireless speaker module 100 detects and receives the first FM signal, and extracts the first FM signal using a tuner such as the tuner of FIG. 3B. . After the demodulation process, the carrier of the first FM signal is removed, and a narrow band including the third data spectrum D3 is filtered to extract the reconstructed first sound source identification signal. According to an embodiment, the filtering may be performed by the band pass filter (BPF) of FIG. 3C. Thereafter, the data signal DATA is generated through data decoding. The data signal DATA may include information about an ID of the first audio transmitter 210_1 that generated the first sound source identification signal. For example, it may contain text such as 'number 1'. As described above with reference to FIG. 1, the data signal DATA is transmitted to the main controller 170.

Then, the main controller 170 selects an arbitrary audio receiver among the first audio receiver 130 and the second audio receiver 140 and transmits a control signal CON. The control signal CON contains information about the ID. For example, the main controller 170 may instruct the first audio receiver 130 to receive the first FM signal by transmitting a control signal CON. Then, the first audio receiver 130 receives the first FM signal and extracts the first FM signal using a tuner such as the tuner TUNER of FIG. 3B. Thereafter, a carrier wave of the first FM signal is removed through a demodulation process, and a narrow band including a third sound source spectrum is filtered to extract the restored first sound source signal. According to an embodiment, the filtering may be performed by the low pass filter (LPF) of FIG. 3C. Thereafter, first audio signals L_OUT1 and R_OUT1 are generated based on the restored first sound source signal. The first audio signals L_OUT1 and R_OUT1 may be substantially the same as the first sound source signal.

The FM signal transmitted as described above includes a sound source signal and a sound source identification signal, and the sound source signal exists in a band of 20 KHz or less, which is an audible frequency band as described above, and the sound source identification signal exists between 40 and 50 KHZ. The sound source signal may be extracted through a low pass filter, and the like, and the sound source identification signal may be extracted through a band pass filter. By doing so, the data transceiver 120 extracts and uses the sound source identification signal, and the audio receivers 130 and 140 extract and use the sound source signal, thereby enabling fast and stable wireless communication without crosstalk between signals.

Implementing a wireless speaker system using the FM method as described above can perform stable communication at low power. More specifically, the FM scheme used in the wireless speaker system 200 of the present invention uses a band of Very High Frequency (VHF), that is, a band of 30 to 300 MHz, used by the FM radio broadcast. Thus, the wavelength is relatively long (as compared to WLAN, for example), and the amplitude of the wave is high, so there is almost no signal interruption due to obstructions. The result is a stable, high-quality audio output that is highly commercially available as a wireless speaker system. In one embodiment, wireless communication of the wireless speaker system 200 may be performed using a Radio Data System FM (RDS FM). In this regard, the RS-FM system refers to a communication protocol standard that carries a small amount of text signals on an existing FM voice broadcast signal. The transmittable text signal may include digital information, time, a unique ID of a base station or an audio generator, information about a program or content transmitted, and the like. In addition, the video signal may be transmitted using an ultra high frequency (UHF) band separately from the audio signal. In detail, when UHF is used, a full-HD image can be transmitted as an analog signal. In this way, the audio signal can be transmitted by the FM method using the wireless speaker system 200 according to the embodiment of the present invention, and the video signal can be dualized by transmitting by using the UHF, resulting in high quality with low power. A wireless home theater system can be implemented.

4 is a block diagram illustrating an example of a data transceiver included in the wireless speaker module of FIG. 1.

Referring to FIG. 4, the data transceiver 120 may include a duplexer 121, an FM receiver 123, a data decoder 125, a data encoder 127, and an FM transmitter 129.

In one embodiment, the data transceiver 120 may be an FM transceiver. The FM transceiver may wirelessly transmit and receive an FM signal. In the receiving step, the FM signal FM_SIGNAL is received from the antenna, and the data signal DATA is output through the duplexer 121, the FM receiver 123, and the data decoder 125. In the transmitting step, the data signal DATA is received. May be input, and the FM signal FM_SIGNAL may be transmitted through the antenna through the data encoder 127, the FM transmitter 129, and the duplexer 121. The FM transceiver is a device mainly used for an electronic device that requires two-way wireless communication. In another embodiment, the data transceiver 120 may be an RDS FM transceiver.

The duplexer 121 may receive the FM signal FM_SIGNAL through an antenna. According to an embodiment, the duplexer 121 may be an antenna duplexer included in an FM transceiver. The antenna duplexer refers to a device for separating transmission and reception signals using one common antenna. Specifically, as a kind of band pass filter that separates using the frequency difference between the transmission and reception signals, it is possible to minimize the interference and noise between the transmission and reception signals to minimize the unnecessary signal.

The FM receiver 123 may receive the FM signal FM_SIGNAL from the duplexer 121, generate an encoded data signal CD_DATA, and transmit the encoded data signal CD_DATA to the data decoder 125. According to an embodiment, the FM receiver 123 may include a tuner, an IF filter, a demodulator, a band pass filter, and the like. First, the FM signal FM_SIGNAL carrying a sound source identification signal, which is a data signal, is extracted and received through the tuner. Thereafter, a carrier wave is removed through the intermediate frequency filter and the demodulator. Thereafter, as described above, the sound source identification signal may be obtained using the band pass filter including the 40 to 50 KHZ band. The encoded data signal CD_DATA output from the FM receiver 123 may be substantially the same as the sound source identification signal. The coded data signal CD_DATA contains information about the ID of the audio transmitter which generated the sound source identification signal. According to an embodiment, the information about the ID may be encoded in binary form.

The data decoder 125 may receive and decode the encoded data signal CD_DATA to generate the data signal DATA. The output terminal of the data decoder 125 may include a plurality of output ports. The data decoder 125 may decode the encoded data signal CD_DATA and output the text corresponding to the ID in digital form. For example, if the sound source identification signal is generated by the first audio receiver 210_1 and includes the corresponding text '1', the data decoder 125 may send 1 to the output port 1. Therefore, the data signal DATA may be a digital signal. Therefore, the main controller 170 may receive a digital signal. The data signal DATA generated by the data decoder 125 may be transmitted to the main controller 170, and the main controller 170 may analyze the data to identify the source of the sound source.

According to an embodiment, the data transceiver 120 included in the wireless speaker module 100 may perform bidirectional wireless communication. For example, when the user changes the speaker setting, the data transceiver 120 may transmit a data signal to the audio transmitters 210_1, 210_2,..., 210_n communicating with each other to determine whether the setting change is completed. In this case, the data encoder 127, the FM transmitter 129, and the duplexer 121 may pass through. In addition, the data transceiver 120 may also be used for the transmitting end of the wireless speaker system 200. The audio transmitters 210_1, 210_2,..., 210_n may be substantially the same devices as the data transceiver 120.

5 is a block diagram illustrating an example of a multi-battery system included in the wireless speaker module of FIG. 1.

Referring to FIG. 5, the multi-battery system 180 may include a battery bank 181, a battery comparator 183, a power controller 185, a power output unit 187, and a battery charger 189. The battery bank 181 includes first to nth battery parts 182_1, 182_2,..., And 182_n, and the first to nth battery parts 182_1, 182_2,..., 182_n each include batteries therein. The battery bank 181 may include n batteries.

The n batteries included in the battery bank 181 may be implemented to be detachable from the first to nth battery units 182_1, 182_2,..., And 182_n, respectively. The multi-battery system 180 may determine whether the plurality of batteries are attached or detached, and determine a battery (ie, a power supply battery) to supply driving power by determining a discharge degree of the plurality of batteries. Whether the batteries are attached or detached and the degree of discharge may be determined based on the output voltage BAT level of the battery included in each of the first to nth battery units 182_1, 182_2,..., 182_n.

The first to n th battery units 182_1, 182_2,..., And 182_n may generate and output the battery confirmation signal BAT_IN and the battery discharge signal Q_BAT based on the output voltage BAT level of the battery. have. For example, the first to nth battery units 182_1, 182_2,..., 182_n generate the battery confirmation signal BAT_IN by comparing the output voltage BAT level of the battery with a predetermined confirmation voltage level. The battery discharge signal Q_BAT may be generated by comparing the output voltage BAT level of the battery with a preset discharge voltage level.

The battery confirmation signal BAT_IN may indicate a detached state of the battery, and the battery discharge signal Q_BAT may indicate whether the battery is discharged. For example, activation of the battery check signal BAT_IN means that the battery is mounted in the corresponding battery compartment, and deactivation of the battery check signal BAT_IN means that the battery is not mounted in the corresponding battery compartment. Can be. In addition, activation of the battery discharge signal Q_BAT may mean that the battery is discharged, and deactivation of the battery discharge signal Q_BAT may mean that the battery is not discharged.

In one embodiment, the battery confirmation signal BAT_IN may be activated when the output voltage BAT level of the battery is higher than the preset confirmation voltage level, and the output voltage BAT level of the battery is set to the preset voltage. Can be disabled if it is below the confirmation voltage level. In addition, the battery discharge signal Q_BAT may be activated when the output voltage BAT level of the battery is lower than the preset discharge voltage level, and the output voltage BAT level of the battery is higher than the preset discharge voltage level. It can be deactivated if high. In this case, the confirmation voltage level and the discharge voltage level may be variously determined by the user according to a condition required for the audio receiver 110 and the other elements 150, 160, and 170.

The battery comparison unit 183 may generate the battery comparison signal CMP by comparing the output voltage BAT levels of the batteries included in the first to nth battery units 182_1, 182_2,..., And 182_n, respectively. The battery comparison signal CMP is provided to the power control unit 185 and may be the basis for generating the battery control signal BAT_CON.

In one embodiment, the battery comparison signal CMP may be generated by detecting an output voltage BAT level of a battery included in each of the first to nth battery units 182_1, 182_2,..., 182_n and comparing them with each other. Can be. In another embodiment, the battery comparison signal CMP may include battery information having the highest output voltage level among the batteries included in the first through nth battery units 182_1, 182_2,..., 182_n and / or the first through nth. Information about an output voltage level ratio between the batteries included in the battery units 182_1, 182_2,..., And 182_n may be included. For example, the battery comparison signal CMP may set the output voltage BAT level of the battery included in the first to nth battery parts 182_1, 182_2,..., 182_n to the first to nth battery parts 182_1 and 182_2. , ..., 182_n may be divided by the sum of output battery (BAT) levels of the battery. In addition, when the battery bank 181 includes only two battery units, the battery comparison signal CMP may be a value obtained by dividing the output voltage BAT level of one battery by the output voltage BAT level of another battery. .

The power control unit 185 may set a criterion for selecting a power supply battery among a plurality of batteries included in the battery bank 181 by receiving the power control signal POWER_CON from the outside. For example, the power controller 185 selects a battery having the highest output voltage level as the power supply battery among the plurality of batteries based on the battery comparison signal CMP, and secures time to charge the batteries having the low output voltage. The power supply battery may be selected by selecting a battery having the lowest output voltage level as the power supply battery, discharging it first, and then charging the battery. The selection criteria of the power supply battery may be variously set according to a condition required for an electronic device. On the other hand, the power control signal POWER_CON may be generated in a form that includes information corresponding to the user's manipulation of the external selection switch of the electronic device. The power control unit 185 receives the battery check signal BAT_IN and the battery discharge signal Q_BAT from the first to nth battery units 182_1, 182_2,..., And 182_n, respectively, and compares the batteries from the battery comparator 183. By receiving the signal CMP, the battery control signal BAT_CON may be generated.

The power output unit 187 selects one of the batteries included in the first to nth battery units 182_1, 182_2,..., 182_n as a power supply battery based on the battery control signal BAT_CON, and supplies the power supply battery. Can be supplied as a driving power supply. In one embodiment, the power output unit 187 may be configured of switches connected to the first to nth battery units 182_1, 182_2,..., 182_n of the battery bank 181, respectively, and may include a battery control signal ( In response to BAT_CON, the switch connected to the battery unit including the power supply battery may be turned on, and the switches connected to other battery units (ie, the non-powered battery) may be turned off. When one battery among the plurality of batteries supplies driving power (POWER) required for driving the audio receiver 110 and the other elements 150, 160, and 170, the other batteries are charged through the battery charger 189. Can be.

The battery charger 189 may not supply power that is not selected as a power supply battery among the batteries included in the first to nth battery units 182_1, 182_2,..., 182_n based on the plurality of battery charge voltages BCV. The battery can be charged. The battery charger 189 may generate a charging current CI for charging the non-powered battery based on the output voltage VB and the output current IB of the non-powered battery. In one embodiment, the battery charger 189 may be implemented in the form of a separate power supply voltage and current detector for balancing the respective batteries so as to prevent overcharging and uniformly charge all the batteries included in the battery bank 181. have. In another embodiment, the battery charger 189 may further include a four-terminal charging module that charges a non-powered battery by using an externally supplied DC power.

As described above, the multi-battery system 180 operates based on a plurality of batteries, and the plurality of batteries alternately supply driving power (POWER), thereby causing the audio receiver 110 to be short of power due to battery discharge. And other devices 150, 160, 170 may not work.

6 is a block diagram illustrating an example of a battery unit included in the multi-battery system of FIG. 5.

Referring to FIG. 6, the battery unit 182 may include a battery 1821, a discharge detector 1823, and a battery checker 1825.

The battery 1821 may be any voltage providing device capable of charging, and the battery 1821 may be detachable, and thus the detachable state may be confirmed by the battery checker 1825. The detached state of the battery 1821 may be sensed based on the output voltage BAT level of the battery 1821. The charging operation of the batteries 1821 included in the first to nth battery units 182_1, 182_2,..., And 182_n may be individually controlled, and the first to nth battery units 182_1, 182_2,..., 182_n may be controlled. The batteries 1821 included in may be simultaneously charged or sequentially charged based on the output voltage BAT level.

Meanwhile, the battery 1821 may be charged by a four terminal charging module (not shown) having a four terminal network. The 4-terminal charging module measures the input voltage, the input current, the output voltage and the output current provided to the battery 1821 through the 4-terminal network to control heat generation based on the current output voltage and output current of the battery 1821. You can check the charge level.

The discharge detector 1823 may generate the battery discharge signal Q_BAT by sensing the output voltage BAT level of the battery 1821. When the output voltage BAT of the battery 1821 is changed as the power of the battery 1821 is supplied to the audio receiver 110 and the other elements 150, 160, and 170, the discharge detector 1823 When the output voltage BAT level of the battery 1821 is lower than the preset discharge voltage level, the battery discharge signal Q_BAT may be activated. On the other hand, the discharge detector 1823 changes the output voltage BAT level of the battery 1821 as the power of the battery 1821 is provided to the audio receiver 110 and the other elements 150, 160, and 170. Even if the output voltage BAT level of the battery 1821 is higher than the preset discharge voltage level, the battery discharge signal Q_BAT may be deactivated.

In an embodiment, the change of the power supply battery between the batteries 1821 included in the first to nth battery units 182_1, 182_2,..., 182_n may be performed in an activation period of the battery discharge signal Q_BAT. . In one embodiment, the preset discharge voltage level may be about 4.2V. As such, when the battery discharge signal Q_BAT is activated, the discharge detector 1823 is discharged to such an extent that the battery 1821 cannot drive the audio receiver 110 and the other devices 150, 160, and 170. To judge. Thereafter, the power control unit 185 is configured to change the power supply battery so that the battery 1821 is completely discharged to stop the operation of the audio receiver 110 and the other elements 150, 160, and 170. 187 can be controlled.

In one embodiment, the battery discharge signal Q_BAT may include a first battery discharge signal Q_BAT_1 and a second battery discharge signal Q_BAT_2. That is, the present invention can detect the output voltage BAT level of the battery 1821 based on reference voltages having different discharge voltage levels for the discharge determination. For example, the discharge detector 1823 generates the first battery discharge signal Q_BAT_1 by comparing the output voltage BAT level of the battery 1821 with a preset first discharge voltage level, and generates the first battery discharge signal Q_BAT_1. The second battery discharge signal Q_BAT_2 may be generated by comparing the output voltage BAT level with a second discharge voltage level lower than the preset first discharge voltage level.

The discharge detector 1823 activates the first battery discharge signal Q_BAT_1 when the output voltage BAT level of the battery 1821 is lower than the first discharge voltage level, and output voltage BAT of the battery 1821. When the level is higher than the first discharge voltage level, the first battery discharge signal Q_BAT_1 may be deactivated. In addition, the discharge detector 1823 activates the second battery discharge signal Q_BAT_2 when the output voltage BAT level of the battery 1821 is lower than the second discharge voltage level, and outputs the output voltage ( When the BAT) level is higher than the second discharge voltage level, the second battery discharge signal Q_BAT_2 may be deactivated.

As such, the power of the battery 1821 is provided to the audio receiver 110 and the other elements 150, 160, and 170 so that the output voltage BAT level of the battery 1821 is lowered. After the first Q_BAT_1 is activated, the second battery discharge signal Q_BAT_2 is activated. In this case, the change of the power supply battery between the batteries 1821 included in the first to nth battery units 182_1, 182_2,..., 182_n may be performed by the activation period of the first battery discharge signal Q_BAT_1 and the second battery. The deactivation section of the discharge signal Q_BAT_2 may be formed in the overlap section. As such, before the power supply battery is completely discharged, the operation of the audio receiver 110 and the other devices 150, 160, and 170 may be stopped by changing the power supply battery to another battery.

As described above, by changing the power supply battery in the overlap section and continuously supplying power to the electronic device, it is possible to prevent chattering from occurring when the power supply battery is changed. Thus, the multi-battery system 180 can continuously supply stable driving power (POWER).

The battery checker 1825 may generate a battery check signal BAT_IN by checking whether the battery 1821 is currently mounted in each of the first to nth battery parts 182_1, 182_2,..., 182_n. In addition, when the battery 1821 is detached and remounted, the battery checker 1825 may initialize the discharge detector 1823 by activating the battery discharge detection initialization signal RST. When the discharge detection unit 1823 is initialized based on the battery discharge detection initialization signal RST, the previous battery discharge signal Q_BAT may be initialized to a logic state 'low'.

In one embodiment, the discharge detector 1823 may include a plurality of comparators, a plurality of resistors, and a flip-flop. The battery checker 1825 may include a comparator, a plurality of resistors, and a capacitor.

7 is a diagram illustrating an example of a 5.1-channel home theater system to which the wireless speaker system is applied.

Referring to FIG. 7, the 5.1-channel home theater system 700 may include an audio generator illustrated as a TV, an audio transmitter connected thereto, and a plurality of wireless speakers. The wireless speaker may include a center speaker W_SPK_C, a left front speaker W_SPK_FL, a right front speaker W_SPK_FR, a left rear speaker W_SPK_RL, a right rear speaker W_SPK_RR, and a subwoofer W_SPK_L. In one embodiment, each speaker may be a wireless speaker module 100. As described above, the 5.1-channel home theater system 700 may be implemented by applying the wireless speaker system 200 of the present invention, and it is possible to produce a stable and high quality audio output at low power.

The present invention can be used in a wireless home theater system. In addition, the present invention can be usefully used for a sound facility using a wireless speaker system, for example, a performance sound facility.

While the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It will be understood.

100: wireless speaker module 110: audio receiver
120: data transceiver 130: first audio receiver
140: second audio receiver 150: audio mixer
160: audio amplifier 170: main controller
180: multi battery system

Claims (9)

An audio receiver configured to receive an FM signal transmitted from an audio transmitter and generate a data signal, a main controller activation signal, a first audio signal, and a second audio signal;
An audio mixer configured to receive and mix the first and second audio signals to generate an audio output signal;
An audio amplifier receiving and amplifying the audio output signal to output sound; And
A main controller configured to receive the data signal, generate an audio activation signal based on the main controller activation signal, and control the audio receiver, the audio mixer, and the audio amplifier,
The audio receiver,
A data transceiver configured to detect a sound source identification signal included in the FM signal, identify a source of a sound source, and generate the main controller activation signal and the data signal;
A first audio receiver activated based on the audio activation signal and receiving the first sound source signal included in the FM signal to generate the first audio signal; And
And a second audio receiver activated based on the audio activation signal and receiving a second sound source signal included in the FM signal to generate the second audio signal. The method of claim 1, wherein the data transceiver
A duplexer for receiving the FM signal through an antenna;
An FM receiver configured to receive the FM signal from the duplexer, demodulate the FM signal, and filter the band including the sound source identification signal to generate an encoded data signal; And
And a data decoder configured to receive the encoded data signal and to decode the encoded data signal to generate the data signal. The method of claim 2,
The main controller transmits a control signal to the first audio receiver and the second audio receiver based on the data signal to cause at least one of the first audio receiver and the second audio receiver to receive the FM signal, And transmitting an output selection signal to the audio mixer to select at least one of the first audio signal and the second audio signal, and transmitting an amplifier control signal to the audio amplifier to control the power of the audio amplifier. Wireless speaker module. The method of claim 3,
The wireless speaker module further includes a multi-battery system for supplying driving power to the audio receiver, the audio mixer, the audio amplifier, and the main controller.
The multi-battery system,
Comparing an output voltage level of a battery with a preset confirmation voltage level, a battery confirmation signal indicating a detached state of the battery is generated, respectively, and the output voltage level of the battery is a preset first discharge voltage level and the first discharge voltage level. A plurality of battery units respectively generating first and second battery discharge signals indicating whether the battery is discharged compared to a lower second discharge voltage level;
A battery comparator configured to generate a battery comparison signal by comparing the output voltage levels of the batteries sensed by the battery parts with each other;
A power controller configured to generate a battery control signal based on the battery confirmation signal, the first and second battery discharge signals, and the battery comparison signal;
A power output unit for supplying the driving power by selecting a battery included in one of the battery units as a power supply battery based on the battery control signal; And
A battery charging unit configured to charge a non-powered battery not selected as the power supply battery among the batteries provided in the plurality of battery units, respectively, based on a plurality of battery charging voltages;
And the power supply battery is changed in an overlap section in which an activation section of the first battery discharge signal and an inactivation section of the second battery discharge signal overlap. The method of claim 4, wherein
The data transceiver is activated by receiving the driving power at all times from the multi-battery system, and the first audio receiver and the second audio receiver are activated by selectively receiving the driving power from the multi-battery system. Wireless speaker module. The method of claim 5,
When the data transceiver detects an FM signal including the sound source identification signal among the surrounding FM signals, the data transceiver generates the main controller activation signal and transmits the signal to the multi-battery system. Activates a controller, the main controller generates and transmits the audio activation signal to the multi-battery system, the multi-battery system supplies and activates the driving power to the first audio receiver and the second audio receiver,
When the FM signal including the sound source identification signal is not detected among the surrounding FM signals, transmission of the main controller activation signal is stopped, and the multi-battery system stops supplying the driving power to the main controller, And deactivating the first audio receiver and the second audio receiver. At least one audio generator for generating different sound source signals;
At least one audio transmitter connected to each of the audio generators to receive the sound source signal and to generate an FM signal including the sound source signal; And
Including a plurality of wireless speaker modules,
Each of the plurality of wireless speaker modules,
An audio receiver configured to receive the FM signal transmitted from the audio transmitter and generate a data signal, a main controller activation signal, a first audio signal, and a second audio signal;
An audio mixer for receiving and mixing the first and second audio signals to produce an audio output signal;
An audio amplifier receiving and amplifying the audio output signal to output sound; And
And a main controller configured to receive the data signal, generate an audio activation signal based on the main controller activation signal, and control the audio receiver, the audio mixer, and the audio amplifier. The method of claim 7, wherein
Each of the audio transmitters has a unique identification (ID) to generate a corresponding sound source identification signal, and combines it with the sound source signals received from the respective audio generators to generate the FM signal. A wireless speaker system, comprising: scanning an FM signal band to find an empty band and transmitting the FM signal using the same. 9. The apparatus of claim 8, wherein each of the audio transmitters is
A data encoder for generating the sound source identification signal by encoding a text signal corresponding to the ID;
An FM transmitter which receives the sound source identification signal from the data encoder, receives the sound source signal from the audio generator, combines and modulates the sound source identification signal and the sound source signal to generate the FM signal; And
And a duplexer configured to receive the FM signal and transmit the FM signal through an antenna.

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