JP2007129337A - Audio reproducing apparatus, and audio reproducing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio reproducing apparatus and an audio reproducing system capable of more properly reproducing a multi-channel audio signal adopting the radio communication technology utilizing, e.g. an FM wave or the like. <P>SOLUTION: The audio reproducing apparatus (100) includes at least: (i) a first audio generating means (signal processing section) for generating a first audio signal corresponding to one channel; (ii) a second audio generating means (signal processing section) for generating a second audio signal corresponding to the other channel; (iii) a first speaker (200C or the like) capable of outputting the first audio signal (SC or the like); (iv) a transmission means (106 or the like) for transmitting the second audio signal on a carrier with a prescribed frequency; (v) a reception means (100R or the like) for receiving the transmitted carrier and demodulating the second audio signal (SRa); and (vi) an acquisition means (111 or the like) for acquiring an output sound resulting from the second audio signal transmitted by the transmission means that is received and outputted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technical field of an audio reproduction device that performs signal processing of an audio signal, for example, and an audio reproduction system including the audio reproduction device.

  In recent years, in video software such as movies, multi-channels (multiple channels, multi-channels) such as Dolby Digital Surround (Dolby Digital Surround) and DTS (Digital Theater Systems) are required to enable powerful and realistic sound reproduction. (Channel, multi-channel) audio signals are recorded. When playing back such video software, in general, video signals are played back on a video monitor, and an amplifier for 2 to 8 channels or a speaker that is compatible with, for example, 5.1ch surround sound system is used. Thus, a multi-channel audio signal is reproduced.

  However, when multi-channel audio signals are played back by a plurality of speakers, when the plurality of speakers and the main body are connected by wire, the number of speakers is increased to two or more unlike conventional stereo playback. . This complicates the speaker cable wiring work and restricts the movement of the speaker itself. In addition, many speaker cables limit the layout of various devices in the acoustic space. Furthermore, wiring work becomes difficult when a speaker is installed overhead (ceiling). Therefore, in recent years, multi-channel audio signals are reproduced by a speaker using a wireless communication technology compliant with a wireless LAN standard such as IEEE802.11b.

  However, due to the above-described reproduction of multi-channel audio signals, for example, the manufacturing cost of an audio reproduction device based on a wireless communication technology compliant with the wireless LAN standard is generally high. ing. Therefore, in order to realize reproduction of multi-channel audio signals at a low cost, an audio reproducing apparatus based on a wireless communication technique using FM waves or the like has been proposed.

  Furthermore, however, in reproduction of multi-channel audio signals including, for example, wireless communication technology using this FM wave or the like, (i) volume characteristics (volume curve) of a speaker connected by wire such as a center speaker, for example, (Ii) It is technically difficult to match the volume characteristics of a speaker capable of receiving FM waves. For this reason, for example, when reproducing multi-channel audio signals including radio communication technology using FM waves or the like, it is difficult to accurately and accurately adjust the sound pressure level, so-called volume control (volume control). It has the technical problem of being.

  The present invention has been made in view of the above-described problems, for example, and an audio reproduction apparatus and method that can more appropriately realize reproduction of a multi-channel audio signal including a wireless communication technology using, for example, FM waves. It is another object of the present invention to provide a computer program that causes a computer to function as such a sound reproducing device.

  In order to solve the above-described problem, an audio reproduction device according to claim 1 is provided with a first audio generation unit (signal processing unit) that generates a first audio signal corresponding to one channel and another channel. Second sound generation means (signal processing unit) for generating a second sound signal, a first speaker (wired speaker) for outputting the first sound signal, and the second sound signal are transmitted by a carrier wave having a predetermined frequency. A transmission means (FM transmitter), an acquisition means (a measuring instrument for measuring via a microphone or an earphone jack) for acquiring an output sound that is received and outputted from the second audio signal transmitted by the transmission means; Is provided.

  In order to solve the above problem, an audio reproduction system according to claim 12 is provided with first audio generation means (signal processing unit) for generating a first audio signal corresponding to one channel and other channels. A second audio generation means (signal processing unit) for generating a second audio signal, a first speaker (wired speaker) for outputting the first audio signal, an audio signal interface for outputting the second audio signal, An audio reproduction device comprising: an acquisition means for acquiring output audio generated based on the second audio signal output by the audio signal interface; and connected to the audio reproduction device, and output from the audio signal interface. A transmission device that transmits the second audio signal using a carrier wave having a predetermined frequency.

  The operation and other advantages of the present invention will become apparent from the embodiments described below.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an audio playback apparatus and method, and a computer program according to an embodiment of the present invention as the best mode for carrying out the invention will be described in order.

(Embodiment of audio playback device)
Hereinafter, an audio reproducing apparatus according to an embodiment of the present invention will be described.

  The embodiment according to the sound reproducing apparatus of the present invention generates first sound generating means (signal processing unit) for generating a first sound signal corresponding to one channel and a second sound signal corresponding to another channel. A second sound generation means (signal processing unit), a first speaker (wired speaker) for outputting the first sound signal, and a transmission means (FM transmitter) for transmitting the second sound signal by a carrier wave having a predetermined frequency. The second audio signal transmitted by the transmission unit includes an acquisition unit (measuring device that measures via a microphone or an earphone jack) that acquires an output audio that is received and output.

  According to the embodiment of the audio reproduction device of the present invention, a first audio signal corresponding to one channel is output by a first speaker such as a speaker capable of wired communication. At the same time or before and after, a carrier wave holding the second audio signal is transmitted while the second audio signal corresponding to another channel is modulated by transmission means such as an FM transmitter. Then, the carrier wave is received by a receiving means such as an FM tuner, and the second audio signal is demodulated. Then, the demodulated second audio signal may be output as output audio by another speaker such as a wireless speaker.

  Next, for example, the output sound output is acquired by an acquisition unit such as a measuring instrument that performs measurement via a microphone or an earphone jack. Based on the acquired output sound, for example, the sound pressure level of the second sound signal output from another speaker, for example, automatically or by manual adjustment by a listener, for example, via adjustment means such as a volume adjuster. May be adjusted.

  As described above, according to the present embodiment, in reproduction of a multi-channel audio signal including a wireless communication technology using, for example, an FM wave, (i) volume characteristics of a speaker connected by wire such as a center speaker, for example. (Volume curve) and (ii) volume characteristics of a speaker capable of receiving FM waves, for example, can be matched almost or completely by, for example, automatic adjustment or by adjustment of a listener.

  As a result, for example, in the reproduction of multi-channel audio signals including radio communication technology using FM waves, etc., it is possible to easily and highly accurately adjust the sound pressure level, so-called volume control (volume control). It becomes.

  In another aspect of the embodiment of the audio reproduction device of the present invention, the audio reproduction apparatus further includes an output unit (for example, a wireless speaker) that receives the second audio signal transmitted by the transmission unit and outputs the second audio signal as the output audio. .

  According to this aspect, as described above, the transmission means transmits the carrier wave holding the second audio signal corresponding to the other channel. Next, for example, a carrier wave may be received by an output unit such as a wireless speaker, and the second audio signal may be demodulated. Next, the second sound signal may be output as output sound by the output means.

  As a result, in reproduction of multi-channel audio signals including, for example, wireless communication technology using FM waves or the like, (i) volume characteristics (volume curve) of a speaker connected by wire such as a center speaker, and (ii) The volume characteristic of the output means such as a wireless speaker capable of receiving FM waves can be matched almost or completely by adjusting the listener, for example.

  In another aspect of the embodiment of the sound reproducing device of the present invention, the determination for determining the optimum output level (optimum volume) of the second sound signal based on the sound pressure level of the output sound obtained by the obtaining means. Means and display means for displaying the optimum output level.

  According to this aspect, the optimum output level, that is, the optimum sound volume in a speaker such as a wireless speaker is determined by the determining unit. Then, the determined optimum output level is displayed to the listener by the display means. As the optimum output level, specifically, the volume characteristic of the amplifier in another speaker such as a wireless speaker may be displayed. Or you may make it display the correspondence of the knob amount (knob movement amount) of the main volume in a 1st speaker, and the knob amount of the main volume in output means, such as a wireless speaker, for example.

  As a result, in the reproduction of multi-channel audio signals including, for example, radio communication technology using FM waves or the like, the adjustment of the sound pressure level, so-called volume control (volume control), is further improved for the listener. Therefore, it can be realized with higher accuracy.

  In another aspect of the embodiment of the sound reproducing device of the present invention, an adjusting means (volume controller) for adjusting the volume of the second sound signal based on the sound pressure level of the output sound acquired by the acquiring means. Is further provided.

  According to this aspect, based on the sound pressure level of the acquired output sound, the sound pressure level of the output second sound signal is adjusted, for example, by automatic adjustment, for example, by adjusting means such as a volume adjuster.

  As a result, the sound pressure level adjustment, so-called volume control (volume adjustment) is performed by the adjusting means in the reproduction of the multi-channel audio signal including the second audio signal under the overall control in the main body of the audio reproduction apparatus. Can be realized with higher accuracy.

  In the aspect according to the adjusting means, the adjusting means may be configured to change the second audio signal based on the volume of the output sound acquired by the acquiring means.

  If comprised in this way, adjustment of a sound pressure level in reproduction | regeneration of the multichannel audio | voice signal containing a 2nd audio | voice signal is carried out by the automatic adjustment by an adjustment means under the comprehensive control in the main body of the said audio | voice reproduction apparatus, It can be realized with higher accuracy.

  In another aspect of the embodiment of the audio reproduction device of the present invention, the audio reproduction device further includes a reception output device (FM radio) that receives and outputs the second audio signal transmitted by the transmission unit, and the acquisition unit includes: It is connected to the audio output terminal (earphone terminal) of the reception output device (FM radio) via a cable.

  According to this aspect, for example, a reception output device such as a wireless speaker that performs substantially the same configuration and operation as the FM radio is further provided. In addition, for example, an acquisition unit such as a measuring instrument for measuring via an audio output terminal such as an earphone terminal is connected via a cable.

  As a result, the sound output is directly acquired by the acquisition means via the cable without interposing the acoustic space. Therefore, in the reproduction of multi-channel audio signals including, for example, radio communication technology using FM waves or the like, the adjustment of the sound pressure level can be realized simply and with high accuracy while suppressing the influence of reverberation in an acoustic space, for example. It becomes possible.

  In another aspect of the embodiment of the audio reproduction device of the present invention, the audio reproduction device further includes a reception output device (FM radio) that receives and outputs the second audio signal transmitted by the transmission unit, and the acquisition unit includes: It is a microphone which acquires the output audio | voice output from the said reception output apparatus (FM radio).

  According to this aspect, in the reproduction of a multi-channel audio signal including, for example, a radio communication technology using FM waves or the like, the adjustment of the sound pressure level is simple and high in consideration of the influence of reverberation in an acoustic space, for example. It can be realized with high accuracy.

  In another aspect of the embodiment of the sound reproducing device of the present invention, a preset unit in which a predetermined frequency is stored in advance and a frequency stored in the preset unit are set as a frequency for transmitting the second sound signal. A frequency setting unit is further provided.

  According to this aspect, in the reproduction of a multi-channel audio signal including, for example, a radio communication technology using FM waves or the like, the sound pressure level can be easily adjusted based on the second audio signal transmitted at a predetermined frequency. In addition, it can be realized with high accuracy.

  In another aspect of the embodiment of the sound reproducing device of the present invention, the transmission means (FM transmitter) can transmit the second sound signal through a plurality of channels (for example, from 3ch to 10ch).

  According to this aspect, for example, a wireless communication technology using FM waves or the like corresponding to a plurality of frequencies is also used, using a plurality of wireless speakers that perform substantially the same configuration and operation as an FM radio owned by a listener, for example. In the reproduction of multi-channel audio signals including it, it is possible to easily and accurately adjust the sound pressure level.

  In another aspect of the embodiment of the sound reproducing device of the present invention, the transmitting means (FM transmitter) transmits the second sound signal obtained by processing the second sound signal corresponding to each of the plurality of channels. Is possible.

  According to this aspect, it is possible to select an arbitrary FM wave corresponding to an arbitrary frequency, for example, by a listener, so that it is possible to effectively prevent interference in wireless communication.

  In another aspect of the embodiment of the audio reproduction device of the present invention, the audio reproduction apparatus further includes a supply unit that supplies a test signal as the first audio signal or the second audio signal.

  According to this aspect, in the reproduction of a multi-channel audio signal including, for example, a radio communication technology using FM waves or the like, the adjustment of the sound pressure level, so-called volume control (volume adjustment) is applied to the supplied test signal. Based on this, it is possible to realize with higher accuracy.

(Embodiment related to audio reproduction system)
Hereinafter, an audio reproduction system according to an embodiment of the present invention will be described.

  The embodiment according to the sound reproduction system of the present invention generates first sound generation means (signal processing unit) for generating a first sound signal corresponding to one channel, and generates a second sound signal corresponding to another channel. The second sound generation means (signal processing unit), the first speaker (wired speaker) that outputs the first sound signal, the sound signal interface that outputs the second sound signal, and the sound signal interface An audio reproduction device comprising: acquisition means for acquiring output audio generated based on the second audio signal; and the audio reproduction device connected to the audio reproduction device, wherein the second audio signal output from the audio signal interface And a transmission device that transmits by a carrier wave of a predetermined frequency.

  According to the embodiment of the sound reproduction system of the present invention, it is possible to receive various benefits of the above-described embodiment of the sound reproduction device of the present invention.

  Incidentally, in response to the various aspects of the embodiment of the audio reproduction device of the present invention described above, the embodiment of the audio reproduction system of the present invention can also adopt various aspects.

  In one aspect of the embodiment of the audio reproduction system of the present invention, the second audio signal transmitted by the transmission device is received, the output audio is generated based on the second audio signal, and the output A reception output device (for example, a wireless speaker) that outputs sound is further provided.

  According to this aspect, the carrier wave holding the second audio signal corresponding to the other channel is transmitted by the transmission device described above. Next, for example, the carrier wave may be received and the second audio signal may be demodulated by an output unit such as a wireless speaker that performs substantially the same configuration and operation as the FM radio. Next, the second sound signal may be output as output sound by the output means.

  As a result, in reproduction of multi-channel audio signals including, for example, wireless communication technology using FM waves or the like, (i) volume characteristics (volume curve) of a speaker connected by wire such as a center speaker, and (ii) The volume characteristic of the output means such as a wireless speaker capable of receiving FM waves can be matched almost or completely by adjusting the listener, for example.

  Such an operation and other advantages of the present embodiment will be clarified from examples described below.

  As described above, according to the embodiment of the sound reproducing device of the present invention, the first sound generating means, the second sound generating means, the first speaker, the transmitting means, and the acquiring means are provided. As a result, for example, in the reproduction of multi-channel audio signals including radio communication technology using FM waves, etc., it is possible to easily and highly accurately adjust the sound pressure level, so-called volume control (volume control). It becomes.

  In addition, according to the embodiment of the audio reproduction system of the present invention, the audio reproduction system includes a first audio generation unit, a second audio generation unit, a first speaker, an audio signal interface, an acquisition unit, and a transmission device. As a result, for example, in the reproduction of multi-channel audio signals including radio communication technology using FM waves, etc., it is possible to easily and highly accurately adjust the sound pressure level, so-called volume control (volume control). It becomes.

  Embodiments according to the present invention will be described below with reference to the drawings.

(1) First Embodiment of Audio Reproducing Device First, a first embodiment of the audio reproducing device of the present invention will be described with reference to FIGS.

(1-1) Basic Configuration First, with reference to FIGS. 1 to 3, a partial configuration will be described in addition to the overall configuration of the audio reproducing device 100 of the present invention. FIG. 1 is a layout diagram showing the overall configuration of the audio reproducing apparatus of the present invention. FIG. 2 is a block diagram showing the basic configuration of the main body as a partial configuration of the audio reproducing apparatus of the present invention. FIG. 3 is a block diagram showing an FM radio as another partial configuration of the sound reproducing apparatus of the present invention.

  As shown in FIG. 1, the audio playback device 100 of the present invention can wirelessly communicate with (i) a main body 100M such as an AV receiver and (ii) a main body 100M as an overall configuration. For example, the FM radio 100R is provided around the listener. In particular, (i) the main body 100M includes (i-1) a center speaker 200C capable of reproducing (outputting), for example, DVD video content, (i-2) a left speaker 200L, and (i-3) a right speaker 200R. Connected by wired communication. The FM radio may constitute a specific example of the “reception output device” of the present invention.

  Specifically, as shown in FIG. 2, the main body 100M includes (i-4) a control unit 101 that controls various means, various characteristics, and various parameters in addition to the above-described various speakers. 5) An input unit 102 to which an audio signal SC (SL, SR) is input, (i-6) a signal processing unit 103 such as an equalizer for processing the audio signal, (i-7) an audio signal subjected to signal processing D / A converter 104 that performs D / A conversion (Digital to Analog Conversion), (i-8) An amplifier 105 that amplifies the audio signal SC (SL, SR), such as an amplifier, for example (i-9) ) The signal-processed audio signal SRa is transmitted to the FM radio via a carrier wave such as an FM wave, for example, a transmitter 106 such as a transmitter, (i-10) an antenna 106A, and (i-11) a test signal is generated. For testing A signal generator 110, an (i-12) switch 110s, and (i-13) a remote controller Re for remotely controlling the control unit 101 are provided.

  In particular, the transmitter may transmit a carrier wave capable of stereo reproduction, or may transmit a carrier wave capable of monaural reproduction. Specifically, in the FM wave broadcasting standard, two sub-channel signals and one main channel signal can be held in one unit of frequency, so that an audio signal is temporarily transmitted to six FM radios. In order to do so, three types of frequencies are required. Further, the transmitter 106 constitutes one specific example of “transmission means” according to the present invention. In addition, the control unit 101, the amplifier 105, and the remote controller Re constitute a specific example of the “adjustment unit” according to the present invention.

  Further, as shown in FIG. 3, the FM radio 100R includes (ii-1) a receiver 107 for receiving an audio signal SRa transmitted from a transmitter 106 such as a transmitter, and an antenna 107A, (ii− 2) A D / A converter 108 for D / A converting the received audio signal SRa, (ii-3) an amplifier 109 for amplifying the audio signal SRa such as an amplifier, and (ii-4) FM radio 2 includes a speaker 200LW for stereo reproduction and (ii-5) a speaker 200RW.

(1-2) Operation Principle Next, in addition to FIG. 4, the operation principle of the audio reproduction device 100 of the present invention will be described with reference to FIGS. 1 to 3 as appropriate. FIG. 4 is a flowchart showing the operation principle of the sound reproducing apparatus of the present invention.

  As shown in FIG. 4, first, in the audio reproduction device 100 of the present invention, it is determined whether or not to adjust the volume of all channels including the speaker of the FM radio 100R under the control of the control unit 101 ( Step S101).

  Here, for example, when it is determined that the volume of all channels is to be adjusted by a remote operation via the remote controller Re by the listener (step S101: Yes), the test signal generator 110 controls the control unit 101. The generated test signal is supplied to the test target channel (for example, the channel for the speaker 200LW of the FM radio 100R) in the signal processing unit 103 by closing the switch 110s (step S102).

  Next, under the control of the control unit 101, the test signal is reproduced, for example, at a predetermined time interval, for example, in the speaker 200LW of the FM radio 100R to be tested, to which the test signal is supplied (step S100). S103).

  Next, based on the listener's audibility, for example, the volume of the speaker 200LW of the FM radio 100R is manually adjusted by the listener (step S104).

  Next, under the control of the control unit 101, it is determined whether or not volume adjustment has been performed on all the speakers to be tested (step S105). Here, in all the speakers, when the volume is not adjusted (step S105: No), the test target is changed to another channel (step S106). Then, the test signal is supplied to a newly tested channel (for example, a channel for the speaker 200RW of the FM radio 100R) (step S102).

  On the other hand, as a result of the determination in step S105 described above, it is determined that the volume is adjusted in all speakers (step S105: Yes), or the determination in step S101 described above is that the volume adjustment of the channel is not performed. If so (step S101: No), a series of volume adjustment processing is terminated.

(1-3) Examination of Action and Effect of Sound Reproducing Device of the Present Invention Next, with reference to FIG. 5, the action and effect of the sound reproducing device of the present invention will be examined. FIG. 5 is a layout diagram showing the overall configuration of the sound reproducing apparatus according to the comparative example.

  As shown in FIG. 5, an audio reproducing device 100x according to a comparative example is replaced with an FM radio according to the first embodiment of the audio reproducing device of the present invention. It is configured with.

  Since the audio reproducing device 100x according to the comparative example is based on a wireless communication technology compliant with the wireless LAN standard, the manufacturing cost of the audio reproducing device is generally high. Even if an audio playback device based on a wireless communication technology using FM waves or the like is used to realize low-cost playback of multi-channel audio signals, the following technical problems Will occur. That is, for example, in the reproduction of a multi-channel audio signal including a wireless communication technology using this FM wave or the like, (i) for example, a volume characteristic (volume curve) of a speaker connected by wire such as a center speaker, and (ii) ) It is technically difficult to match the volume characteristics of a speaker capable of receiving FM waves. For this reason, for example, when reproducing multi-channel audio signals including radio communication technology using FM waves or the like, it is difficult to accurately and accurately adjust the sound pressure level, so-called volume control (volume control). It is.

  On the other hand, according to the present embodiment, as described above, under the control of the control unit 101, for example, the listener adjusts the volume, that is, the so-called sound pressure level adjustment (volume control). Accordingly, in reproduction of multi-channel audio signals including, for example, wireless communication technology using FM waves or the like, (i) volume characteristics (volume curve) of a speaker connected by wire such as a center speaker, and (ii) FM It becomes possible to almost or completely match the volume characteristic of a speaker capable of receiving a wave. Here, the “volume characteristic” according to the present invention is a physical characteristic related to the output performance of the speaker. For example, the volume characteristic is a characteristic indicating a transition of an output sound pressure level using a frequency as a parameter. Also good.

  As a result, for example, in reproduction of multi-channel audio signals including wireless communication technology using FM waves or the like, volume adjustment can be realized simply and with high accuracy. More specifically, for example, in a sound reproducing apparatus including a speaker that does not support the surround sound system such as a DVD mini-component that performs stereo reproduction, a speaker capable of receiving FM waves such as an FM radio owned by a listener is used. Thus, for example, volume adjustment in reproduction of multi-channel audio signals can be realized easily and with high accuracy without downmixing to stereo reproduction or the like.

(2) Second Embodiment of Sound Reproducing Device Next, a second embodiment according to the sound reproducing device of the present invention will be described.

(2-1) Basic Configuration and Operation Principle First, with reference to FIG. 6 to FIG. 8, the basic configuration and operation principle of the second embodiment according to the audio reproducing device 100-2 of the present invention will be described. In the operation principle according to the second embodiment, the number of FM radio speakers to be tested, for example, is increased to three channels, and the description is omitted. FIG. 6 is a layout diagram showing the overall configuration of the second embodiment of the audio reproducing apparatus of the present invention. FIG. 7 is a block diagram showing a basic configuration of the main body as a partial configuration of the second embodiment of the audio reproducing apparatus of the present invention. FIG. 8 is a table showing a correspondence relationship between a plurality of carrier waves and a plurality of FM radios in the second embodiment of the sound reproducing apparatus of the present invention.

  In addition, since the structure of FM radio provided with the receiver based on 2nd Example is substantially the same as that of 1st Example, description is abbreviate | omitted suitably. In FIGS. 6 and 7, the same components as those of the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  As shown in FIG. 6 and FIG. 7, in the second embodiment of the sound reproducing device of the present invention, sound signals of a plurality of channels are obtained by a plurality of types of FM waves respectively corresponding to a plurality of frequencies. It may be possible to transmit to a plurality of FM radios. Specifically, the transmitter 106-2 according to the second embodiment transmits the signal-processed three-channel audio signal SRa1 (SRa2, SRa3) via a carrier wave such as FM waves of three types of frequencies. It may be possible to transmit to one FM radio 100R1 (100R2, 100R3). More specifically, as illustrated in FIG. 8, the transmitter 106-2 transmits the signal-processed audio signal SRa1 to the FM radio 100R1 via a carrier wave corresponding to “F1 (Hz)”, for example. The audio signal SRa2 subjected to signal processing may be transmitted to the FM radio 100R2 via a carrier wave corresponding to, for example, “F2 (Hz)”, or may be subjected to signal processing. The audio signal SRa3 may be transmitted to the FM radio 100R3 via a carrier wave corresponding to “F3 (Hz)”, for example.

  As a result, according to the second embodiment of the sound reproducing apparatus of the present invention, wireless communication using FM waves corresponding to a plurality of frequencies, for example, using a plurality of FM radios owned by the listener, for example. In reproduction of multi-channel audio signals including technology, adjustment of sound pressure level, so-called volume control (volume adjustment) can be realized easily and with high accuracy. Specifically, since any FM wave corresponding to any frequency can be selected by the listener, interference in wireless communication can be effectively prevented.

(3) Third Embodiment of Audio Reproducing Device Next, a third embodiment according to the audio reproducing device of the present invention will be described.

(3-1) Basic Configuration First, with reference to FIG. 9, the basic configuration of the third embodiment according to the audio reproducing device 100-3 of the present invention will be described. FIG. 9 is a block diagram showing the basic configuration of the third embodiment according to the sound reproducing apparatus of the present invention. In FIG. 9, the same components as those of the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  As shown in FIG. 9, the third embodiment of the sound reproducing apparatus according to the present invention includes a microphone 111 (which collects sounds reproduced by various speakers) in addition to the components according to the first embodiment described above. That is, an example of “acquisition means” according to the present invention, an amplifier 112 for amplifying the sound pressure level of the collected sound and outputting the amplified sound signal, and A / D conversion ( It further comprises an A / D converter 113 that performs analog to digital conversion.

(3-2) Operation Principle Next, with reference to FIG. 10, the operation principle of the third embodiment of the audio reproducing device 100-3 according to the present invention will be described. FIG. 10 is a flowchart showing the operating principle of the third embodiment of the sound reproducing apparatus according to the present invention. In FIG. 10, the same steps as those in the first embodiment described above are denoted by the same step numbers, and description thereof will be omitted as appropriate.

  As shown in FIG. 10, in step S103 described above, the test signal is supplied to the test target, for example, the speaker 200LW of the FM radio 100R to which the test signal is supplied under the control of the control unit 101. For example, it is reproduced for a predetermined time interval.

  Next, the reproduced test signal is collected by, for example, the microphone 111 under the control of the control unit 101 (step S301).

  Next, under the control of the control unit 101, based on the collected test signal, for example, a volume characteristic (volume curve) corresponding to the speaker 200LW of the FM radio 100R is acquired (step S302).

  Next, as a result of the determination in step S105 described above, when volume characteristics are acquired for all speakers (step S105: Yes), all speakers and all channels are supported under the control of the control unit 101. The optimum output level is determined (step S303).

  As described above, according to the third embodiment of the sound reproducing device of the present invention, the test signal is collected by the acquisition means such as the microphone including the influence of reverberation in the acoustic space. As a result, in the reproduction of multi-channel audio signals including, for example, radio communication technology using FM waves, so-called volume control (volume adjustment) is considered in consideration of the effects of reverberation in an acoustic space, for example. Thus, it can be realized easily and with high accuracy.

(4) Fourth Embodiment of Sound Reproducing Device Next, a fourth embodiment according to the sound reproducing device of the present invention will be described.

(4-1) Basic Configuration First, with reference to FIG. 11, the basic configuration of the fourth embodiment according to the audio reproducing device 100-4 of the present invention will be described. FIG. 11 is a layout diagram showing the overall configuration of the fourth embodiment according to the audio reproducing apparatus of the present invention. In FIG. 11, the same components as those in the first to third embodiments described above are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  As shown in FIG. 11, the fourth embodiment of the sound reproducing apparatus of the present invention includes, for example, an earphone terminal of an FM radio 100R, a main body 100-4, in addition to the components according to the first embodiment described above. Are further provided with an earphone cord 40 for connecting the sound and a measuring device 41 for measuring the sound pressure level of the sound output via the earphone cord.

(4-2) Operation Principle Next, with reference to FIG. 12, the operation principle of the fourth embodiment of the audio reproducing device 100-4 according to the present invention will be described. FIG. 12 is a flowchart showing the operation principle of the fourth embodiment of the sound reproducing apparatus according to the present invention. In FIG. 12, the same steps as those in the first to third embodiments described above are denoted by the same step numbers, and description thereof will be omitted as appropriate.

  As shown in FIG. 12, in step S103 described above, the test signal is supplied to the test target, for example, the earphone terminal of the FM radio 100R to which the test signal is supplied under the control of the control unit 101. For example, it is reproduced for a predetermined time interval.

  Next, under the control of the control unit 101, the measuring device 41 measures the sound pressure level of the test signal output via the earphone cord (step S401).

  As described above, according to the fourth embodiment of the sound reproducing device of the present invention, the sound pressure level of the test signal is directly measured by the measuring device 41 via the earphone cord, for example. As a result, in the reproduction of multi-channel audio signals including radio communication technology using, for example, FM waves, so-called volume control (volume control) is performed to suppress the influence of reverberation in an acoustic space, for example. However, it can be realized easily and with high accuracy.

  In the above-described embodiment, as a specific example of the audio reproducing device, for example, an audio reproducing device that reproduces a multi-channel audio signal including, for example, a wireless communication technology using FM waves or the like has been described. The present invention can also be applied to a sound reproducing device having a speaker as shown below. (I) For example, a speaker for a personal computer, a vehicle-mounted speaker, or a speaker for an amusement device (such as an arcade game or a pachinko machine). (Ii) A speaker mounted on a small radio, radio cassette, or minicomponent in which a main part and a speaker are integrated.

  Furthermore, the audio signal to be processed by the audio reproduction apparatus according to the above-described embodiment may be an analog signal or a digital signal. In addition, the signal processing by the audio reproduction apparatus according to the present embodiment is not limited to the audio signal, but can be applied to various signals such as a moving image signal, a still image signal, a communication signal, a signal including some low frequency signal, and a high frequency signal. It is.

  As another embodiment, the transmitter 106 or 106-2 may be set to a frequency having a value designated by a frequency setting unit (not shown) as a frequency for transmitting an audio signal. The frequency specified here is a frequency held in a storage means such as a memory (not shown) and does not interfere with television broadcasting or radio broadcasting, so that the transmission of the audio signal interferes with the frequency of the radio or the like. Can be prevented.

  Furthermore, as another embodiment, the transmitter 106 or 106-2 may be configured as a device different from the audio reproduction device 100 or 100-2. In this case, the audio signal is sent to the transmitter by connecting to the transmitter via an interface capable of outputting the audio signal, such as an earphone jack of the audio reproduction device, and the audio signal is transmitted from the transmitter at a predetermined frequency. You may make it output.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification. In addition, an audio reproduction system is also included in the technical scope of the present invention.

It is the layout figure which showed the whole structure of the audio | voice reproduction apparatus of this invention. It is the block diagram which showed the basic composition of the main body as one partial structure of the audio | voice reproduction apparatus of this invention. It is the block diagram which showed FM radio as another partial structure of the audio | voice reproduction apparatus of this invention. It is the flowchart which showed the principle of operation of the audio | voice reproduction apparatus of this invention. It is the layout figure which showed the whole structure of the audio | voice reproduction apparatus which concerns on a comparative example. It is the layout figure which showed the whole structure of 2nd Example which concerns on the audio | voice reproduction apparatus of this invention. It is the block diagram which showed the basic composition of the main body as one partial structure of 2nd Example which concerns on the audio | voice reproduction apparatus of this invention. It is the table which showed the corresponding | compatible relationship between several carrier waves and several FM radio in 2nd Example which concerns on the audio | voice reproducing apparatus of this invention. It is the block diagram which showed the basic composition of 3rd Example which concerns on the audio | voice reproduction apparatus of this invention. It is the flowchart which showed the principle of operation of 3rd Example of the audio | voice reproduction apparatus based on this invention. It is the layout figure which showed the whole structure of 4th Example which concerns on the audio | voice reproduction apparatus of this invention. It is the flowchart which showed the principle of operation of 4th Example of the audio | voice reproduction apparatus based on this invention.

Explanation of symbols

40 Earphone code 41 Measuring device 100 Audio reproduction device 100M Main body 100R FM radio 101 Control unit 102 Input unit 103 Signal processing unit 104 D / A converter 105 Amplifier 106 Transmitter 106A Antenna 110 Test signal generator 110s Switch 111 Microphone 107 Reception 107A Antenna 108 D / A converter 109 Amplifier 200LW Speaker 200RW Speaker 200C Center speaker 200L Left speaker 200R Right speaker Re Remote control SC (SL, SR) Audio signal SRa Audio signal

Claims (13)

First sound generation means for generating a first sound signal corresponding to one channel;
Second sound generation means for generating a second sound signal corresponding to another channel;
A first speaker for outputting the first audio signal;
Transmitting means for transmitting the second audio signal by a carrier wave of a predetermined frequency;
An acquisition means for acquiring an output sound that is received and outputted from the second sound signal transmitted by the transmission means;
An audio reproducing apparatus comprising:   The audio reproduction device according to claim 1, further comprising an output unit that receives the second audio signal transmitted by the transmission unit and outputs the second audio signal as the output audio. Determining means for determining an optimum output level of the second sound signal based on a sound pressure level of the output sound acquired by the acquiring means;
Display means for displaying the optimum output level;
The audio reproducing apparatus according to claim 1, further comprising:   4. The apparatus according to claim 1, further comprising an adjusting unit that adjusts a volume of the second audio signal based on a sound pressure level of the output sound acquired by the acquiring unit. 5. Audio playback device.   The sound reproducing apparatus according to claim 4, wherein the adjusting unit changes the second sound signal based on a volume of the output sound acquired by the acquiring unit. A reception output device for receiving and outputting the second audio signal transmitted by the transmission means;
6. The audio reproduction device according to claim 1, wherein the acquisition unit is connected to an audio output terminal of the reception output device via a cable. A reception output device for receiving and outputting the second audio signal transmitted by the transmission means;
The sound reproducing apparatus according to claim 1, wherein the acquisition unit is a microphone that acquires output sound output from the reception output apparatus. A preset unit in which a predetermined frequency is stored in advance;
The audio reproduction device according to any one of claims 1 to 7, further comprising a frequency setting unit that sets a frequency stored in the preset unit as a frequency for transmitting the second audio signal. .   9. The audio reproduction device according to claim 1, wherein the transmission unit is capable of transmitting the second audio signal through a plurality of channels. 9.   10. The transmission device according to claim 1, wherein the transmission unit is capable of transmitting the second audio signal obtained by processing the second audio signal in correspondence with each of the plurality of channels. The audio reproducing device described.   11. The audio reproduction device according to claim 1, further comprising a supply unit configured to supply a test signal as the first audio signal or the second audio signal. First sound generation means for generating a first sound signal corresponding to one channel;
Second sound generation means for generating a second sound signal corresponding to another channel;
A first speaker for outputting the first audio signal;
An audio signal interface for outputting the second audio signal;
An audio reproduction apparatus comprising: an acquisition unit configured to acquire output audio generated based on the second audio signal output by the audio signal interface;
A transmission device connected to the audio reproduction device and transmitting the second audio signal output from the audio signal interface by a carrier wave of a predetermined frequency;
An audio playback system comprising:   The apparatus further includes a reception output device that receives the second audio signal transmitted by the transmission device, generates the output audio based on the second audio signal, and outputs the output audio. Item 13. The sound reproduction system according to Item 12.

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