WO2015118643A1 - Audio device - Google Patents

Audio device Download PDF

Info

Publication number
WO2015118643A1
WO2015118643A1 PCT/JP2014/052773 JP2014052773W WO2015118643A1 WO 2015118643 A1 WO2015118643 A1 WO 2015118643A1 JP 2014052773 W JP2014052773 W JP 2014052773W WO 2015118643 A1 WO2015118643 A1 WO 2015118643A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
output
amplifier
speaker
current
Prior art date
Application number
PCT/JP2014/052773
Other languages
French (fr)
Japanese (ja)
Inventor
匡太 渡邊
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2014/052773 priority Critical patent/WO2015118643A1/en
Priority to JP2015561103A priority patent/JP6045726B2/en
Publication of WO2015118643A1 publication Critical patent/WO2015118643A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers

Definitions

  • the present invention relates to an audio apparatus having a function of detecting a connection state of speakers.
  • Patent Document 1 discloses an audio device in which a central speaker is connected to an output terminal of a left BTL amplifier in which a left speaker is connected to a BTL (Bridged TransLess) and an output terminal of a right BTL amplifier in which a right speaker is connected to a BTL. Is disclosed. With this configuration, monaural sound can be output from the central speaker without providing a central BTL amplifier for BTL connection of the central speaker.
  • BTL Binary TransLess
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an audio device that can accurately detect the connection state of speakers connected to the output terminals of the left and right BTL amplifiers. To do.
  • An audio apparatus includes a first speaker that outputs left-side sound, a first amplifier that amplifies a signal output from the first speaker by BTL connection to the first speaker, and right-side sound.
  • An audio device for detecting a connection state, a signal generator for generating a detection signal, a first phase adjuster for adjusting a phase of a signal output to the first amplifier, and an output to the second amplifier
  • a second phase adjuster for adjusting the phase of the signal
  • a first current detector for detecting a current flowing through the output terminal of the first amplifier
  • a second for detecting a current flowing through the output terminal of the second amplifier Current detector of The current values detected by the first and second current detectors are compared when the first and second phase adjusters output in-phase and anti-phase detection signals to the first and second amplifiers, respectively.
  • a determination unit that determines a connection state of the third speaker from determination data in which the magnitude relationship between the flowing current values is associated with the connection state of the third speaker with respect to the output terminals of the first and second amplifiers; Prepare.
  • FIG. 4 is a flowchart showing a speaker connection state detection process by the audio apparatus according to Embodiment 1.
  • 5 is a diagram showing an outline of a speaker connection state detection process in Embodiment 1.
  • FIG. It is a flowchart which shows the detection process of the connection state of the speaker by the audio apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the magnitude relationship of the state in which the subwoofer in Embodiment 3 of this invention is connected to Lch (+) and Rch (-), and the output current value of the amplifier corresponding to this connection state.
  • FIG. 10 is a diagram illustrating a magnitude relationship between a state in which a subwoofer in Embodiment 3 is connected to Lch ( ⁇ ) and Rch (+) and an output current value of an amplifier corresponding to this connection state.
  • FIG. 10 is a diagram illustrating a magnitude relationship between a state in which a subwoofer in Embodiment 3 is connected to Lch ( ⁇ ) and Rch ( ⁇ ) and an output current value of an amplifier corresponding to this connection state.
  • FIG. 1 is a block diagram showing a configuration of an audio apparatus according to Embodiment 1 of the present invention.
  • the audio device shown in FIG. 1 is an on-vehicle audio device and includes speakers 1 and 2, a subwoofer 3, an amplifier 4, phase adjusters 5 a and 5 b, a signal generator 6, and a control unit 7.
  • the speaker 1 is a first speaker that outputs the left audio, and is BTL-connected to the amplifier circuit 4 a on the left side of the amplifier 4.
  • the speaker 2 is a second speaker that outputs right sound, and is BTL-connected to the right amplifier circuit 4 b in the amplifier 4. Further, the subwoofer 3 does not have a dedicated amplifier circuit, and is connected to the output terminals Lch (+) and Rch ( ⁇ ) of the amplifier circuits 4a and 4b to which the speakers 1 and 2 are BTL-connected. It is a speaker.
  • the amplifier 4 is an amplifier that amplifies the left stereo signal and the right stereo signal, and includes amplifier circuits 4a and 4b. That is, FIG. 1 only shows a configuration for detecting connection of speakers, and the amplifier circuits 4a and 4b receive only the outputs of the phase adjusters 5a and 5b, but are not shown in the amplifier circuits 4a and 4b.
  • the left stereo signal and the right stereo signal output from the audio circuit are also input.
  • the amplifier circuit 4a is a first amplifier that amplifies the left stereo signal, and includes a current detection circuit 4a-1 and an amplification circuit 4a-2.
  • the amplifier circuit 4b is a second amplifier that amplifies the right stereo signal, and includes a current detection circuit 4b-1 and an amplification circuit 4b-2.
  • the current detection circuit 4a-1 is a first current detection unit that detects a current flowing through the output terminal of the amplifier circuit 4a.
  • the current detection circuit 4b-1 is a second current detection unit that detects a current flowing through the output terminal of the amplifier circuit 4b.
  • the amplifier circuit 4a-2 amplifies the in-phase output signal of the left stereo signal and outputs it to the in-phase output terminal Lch (+), amplifies the anti-phase output signal of the left stereo signal and outputs to the anti-phase output terminal Lch ( ⁇ ). Output.
  • the amplifier circuit 4b-2 amplifies the in-phase output signal of the right stereo signal and outputs it to the in-phase output terminal Rch (+), amplifies the out-of-phase output signal of the right stereo signal, and outputs the anti-phase output terminal Rch ( ⁇ ). Output to.
  • the phase adjuster 5 a is a first phase adjuster that adjusts the phase of a signal output to the amplifier circuit 4 a in accordance with an instruction from the control unit 7.
  • the phase adjuster 5b is a second phase adjuster that adjusts the phase of a signal output to the amplifier circuit 4b in accordance with an instruction from the control unit 7.
  • the signal generator 6 generates a detection signal for detecting the speaker connection state in accordance with an instruction from the control unit 7. Examples of the detection signal include a pulse wave (DC signal, pulse signal) of about 200 ms or an arbitrary AC wave (AC signal).
  • the control unit 7 is realized by a microcomputer mounted on the audio device according to Embodiment 1, and performs various controls of the audio device.
  • the control unit 7 includes a current comparison unit 70 and a speaker connection determination unit 71.
  • the current comparison unit 70 and the speaker connection determination unit 71 are realized by, for example, a microcomputer programmed by software.
  • the current comparison unit 70 compares the current values flowing through the output terminals of the amplifier 4 when the in-phase and anti-phase detection signals are respectively output to the amplifier 4. The result of this comparison is output to the speaker connection determination unit 71.
  • the speaker connection determination unit 71 is a determination unit that determines the connection state of the subwoofer 3 based on the comparison result input from the current comparison unit 70. In addition, the speaker connection determination unit 71 indicates the magnitude relationship between the current values flowing through the output terminals of the amplifier 4 when the in-phase and anti-phase detection signals are output to the amplifier 4. Determination data associated with the connection state of the woofer 3 is registered. The speaker connection determination unit 71 determines the connection state of the subwoofer 3 by referring to the determination data based on the comparison result input from the current comparison unit 70.
  • FIG. 2 is a flowchart showing speaker connection state detection processing by the audio apparatus according to Embodiment 1.
  • a process for detecting whether or not the subwoofer 3 is connected will be described with reference to FIG.
  • the control unit 7 transmits a command for outputting a detection signal to the signal generator 6.
  • the signal generator 6 generates a detection signal in accordance with the command and outputs it to the phase adjuster 5a and the phase adjuster 5b (step ST1).
  • phase adjuster 5a and the phase adjuster 5b are output between the common-phase output terminal Lch (+) and the negative-phase output terminal Lch ( ⁇ ) of the left amplifier circuit 4a under the control of the control unit 7. Detection signal input from the signal generator 6 so that the output signal is in phase with the signal output between the in-phase output terminal Rch (+) and the reverse-phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b. The phase of the signal for use is adjusted and output to the amplifier circuit 4a and the amplifier circuit 4b, respectively (step ST2).
  • the current detection circuit 4a-1 detects the current value I Lp flowing through the in-phase output terminal Lch (+) of the amplifier circuit 4a
  • the current detection circuit 4b-1 detects the current value I Rp flowing through the in-phase output terminal Rch (+) of the amplifier circuit 4b (step ST3).
  • the current comparison unit 70 of the control unit 7 reads and stores the current values I Lp and I Rp detected by the current detection circuits 4a-1 and 4b-1.
  • the current value detected by the current detection circuit 4a-1 is set to I Lp1 , and the current detection circuit 4b-1 Let the detected current value be I Rp1 .
  • phase adjuster 5a and the phase adjuster 5b are output between the common-phase output terminal Lch (+) and the negative-phase output terminal Lch ( ⁇ ) of the left amplifier circuit 4a under the control of the control unit 7. Detection signal input from the signal generator 6 so that the output signal is opposite in phase to the signal output between the in-phase output terminal Rch (+) and the out-of-phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b. The phase of the signal for use is adjusted and output to the amplifier circuit 4a and the amplifier circuit 4b, respectively (step ST4).
  • the current detection circuit 4a-1 detects the current value I Lp flowing through the in-phase output terminal Lch (+) of the amplifier circuit 4a
  • the current detection circuit 4b-1 detects the current value I Rp flowing through the in-phase output terminal Rch (+) of the amplifier circuit 4b (step ST5).
  • the current comparison unit 70 reads out the current values I Lp and I Rp detected by the current detection circuits 4a-1 and 4b-1.
  • the current value detected by the current detection circuit 4a-1 when an antiphase detection signal is output to the left channel Lch and the right channel Rch of the amplifier 4 is defined as I Lp2
  • the current detection circuit 4b-1 Let the detected current value be I Rp2 .
  • the current comparison unit 70 compares the current values I Lp1 and I Rp1 when the detection signals are in phase with the current values I Lp2 and I Rp2 when the detection signals are in reverse phase. The result of this comparison is output to the speaker connection determination unit 71.
  • the speaker connection determination unit 71 outputs the in-phase outputs of the amplifier circuits 4a and 4b when the detection signals having the same phase and the opposite phase are output to the amplifier circuits 4a and 4b based on the result of the comparison by the current comparison unit 70, respectively.
  • the determination data associated with the presence / absence of connection of the subwoofer 3 is referred to by the magnitude relationship between the current values flowing through the terminals Lch (+) and Rch (+).
  • the speaker connection determination unit 71 determines that the subwoofer 3 is in the open state (step ST7).
  • current value I Lp1 is larger than current values I Lp2 and I Rp2 (step ST6; NO)
  • FIG. 3 is a diagram showing an outline of the speaker connection state detection process in the first embodiment.
  • FIG. 3A shows a case where the detection signal is output to the amplifier 4 with the same phase
  • FIG. 3B shows a case where the detection signal is output to the amplifier 4 with the opposite phase.
  • the in-phase input terminal of the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a
  • the opposite phase input terminal is connected to the opposite phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b.
  • the subwoofer 3 when a signal having the same phase is output to the left channel Lch and the right channel Rch of the amplifier 4, the subwoofer 3 outputs the in-phase output terminal Lch (+) of the amplifier circuit 4a and the amplifier circuit.
  • the potential difference of the reverse phase output terminal Rch ( ⁇ ) of 4b is output as a sound signal, and a current corresponding to the subwoofer 3 flowing from the Lch (+) side having a high potential is generated.
  • signals having opposite phases are output to the left channel Lch and the right channel Rch of the amplifier 4 as shown in FIG. 3B, the in-phase output terminal Lch (+) of the amplifier circuit 4a and the opposite phase output of the amplifier circuit 4b. Since there is no potential difference between the terminals Rch ( ⁇ ), no sound is output from the subwoofer 3 and no current flows.
  • the in-phase input terminal and the out-of-phase input terminal of the subwoofer 3 are normally connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the out-of-phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b.
  • the current value I Lp1 is greater than the current values I Lp2 and I Rp2. It becomes larger (I Lp1 > I Lp2 , I Rp2 ).
  • the current values flowing through the output terminals of the amplifier circuits 4a and 4b when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b are compared. Based on the result of this comparison, when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, the magnitude relationship between the current values flowing in the output terminals of the amplifier circuits 4a and 4b is The connection state of the subwoofer 3 is determined from the determination data associated with the connection state of the subwoofer 3 with respect to the output terminals of the circuits 4a and 4b.
  • determination data flows between the in-phase output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively.
  • the magnitude relationship between the current values is data associated with whether or not the subwoofer 3 is connected to the output terminals of the amplifier circuits 4 a and 4 b, and the speaker connection determination unit 71 determines based on the comparison result by the current comparison unit 70.
  • the speaker connection determination unit 71 determines based on the comparison result by the current comparison unit 70.
  • the loudspeaker connection determination unit 71 determines the magnitude relationship between the current values flowing through the antiphase output terminals Lch ( ⁇ ) and Rch ( ⁇ ) of the amplifier circuits 4a and 4b, and the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b. Whether or not the subwoofer 3 is connected may be determined by referring to the determination data associated with the presence or absence of the connection.
  • FIG. The speaker connection determination unit 71 outputs in-phase output terminals Lch (+) and Rch () of the amplifier circuits 4a and 4b when in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively.
  • the determination data in which the magnitude relationship between the current values flowing in (+) is associated with the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a and 4b is set.
  • the speaker connection determination unit 71 determines which output terminal of the amplifier 4 the subwoofer 3 is connected to by referring to the determination data described above based on the comparison result by the current comparison unit 70. can do.
  • FIG. 4 is a flowchart showing speaker connection state detection processing by the audio apparatus according to Embodiment 2 of the present invention.
  • the current flowing through the in-phase output terminals of the amplifier circuits 4a and 4b is detected as in the first embodiment, and the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b. It is determined which output terminal of the amplifier 4 the subwoofer 3 is connected to based on the result of comparing the magnitudes of the current values flowing through the common-mode output terminals of the circuits 4a and 4b.
  • the speaker connection determination unit 71 confirms that the subwoofer 3 is normally connected in the same manner as in the first embodiment (step ST1a). That is, if the result of comparison by the current comparison unit 70 is in the state of I Lp1 > I Lp2 , I Rp2 , the subwoofer 3 is normally connected.
  • the speaker connection determination unit 71 Referring to the determination data, it is determined that the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the opposite-phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b. (Step ST3a).
  • the speaker connection determination unit 71 connects other than the determination results of step ST3a and step ST5a. It is determined that the subwoofer 3 is connected because of the relationship (step ST6a). For example, the subwoofer 3 is connected to the common-mode output terminal Lch ( ⁇ ) of the left amplifier circuit 4a and the common-mode output terminal Rch (+) of the right amplifier circuit 4b, or the common-mode output of the left amplifier circuit 4a. It is conceivable that the terminal Lch ( ⁇ ) is connected to the common-mode output terminal Rch ( ⁇ ) of the right amplifier circuit 4b.
  • the in-phase output terminal Lch of the amplifier circuits 4a and 4b is output when the determination data is output to the amplifier circuits 4a and 4b, respectively.
  • the magnitude relationship between the current values flowing through (+) and Rch (+) is data associated with the connection relationship of the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b.
  • the speaker connection determination unit 71 determines whether the subwoofer 3 is connected to the output terminals of the amplifier circuits 4a and 4b by referring to the determination data based on the comparison result by the current comparison unit 70. .
  • the phase of the detection signal output to the amplifier circuits 4a and 4b is changed, the magnitude relationship between the current values flowing through the common-mode output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b is sub. If the change depending on the connection relationship of the woofer 3 is used, although it is limited as described above, it is possible to determine which output terminal (port) of the amplifier circuits 4a and 4b the subwoofer 3 is connected to. it can. Thereby, it is possible to roughly determine not only whether or not the subwoofer 3 is connected, but which port is erroneously connected.
  • the loudspeaker connection determination unit 71 determines the magnitude relationship between the current values flowing through the antiphase output terminals Lch ( ⁇ ) and Rch ( ⁇ ) of the amplifier circuits 4a and 4b, and the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b.
  • the connection relationship of the subwoofer 3 may be determined by referring to the determination data associated with the connection relationship.
  • Embodiment 3 FIG.
  • the in-phase output terminals Lch (+) and Rch (of the amplifier circuits 4a and 4b are output when in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively. (+) And the magnitude relationship between the current values flowing through both the negative phase output terminals Lch ( ⁇ ) and Rch ( ⁇ ) are determined in correspondence with the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a and 4b. Data is set. Accordingly, the speaker connection determination unit 71 refers to the determination data described above based on the result of comparison by the current comparison unit 70, thereby accurately determining which output terminal of the amplifier 4 the subwoofer 3 is connected to. Can be determined.
  • FIG. 5 is a diagram showing the magnitude relationship between the state in which the subwoofer in the third embodiment is connected to Lch (+) and Rch ( ⁇ ) and the output current value of the amplifier corresponding to this connection state.
  • the subwoofer 3 when the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the opposite-phase output terminal Rch ( ⁇ ) of the right amplifier circuit 4b, the same phase is detected.
  • the current I Ln1 is a current that flows to the negative-phase output terminal Lch ( ⁇ ) of the left amplifier circuit 4a when the detection signal having the same phase is output to the amplifier 4.
  • the current I Rn1 is a current that flows to the negative phase output terminal Lch ( ⁇ ) of the right amplifier circuit 4b when the detection signal having the same phase is output to the amplifier 4.
  • the signal for detecting the opposite phase is amplified.
  • the current ILn2 is a current that flows through the antiphase output terminal Lch ( ⁇ ) of the left amplifier circuit 4a when the antiphase detection signal is output to the amplifier 4.
  • the current I Rn2 is a current that flows to the negative-phase output terminal Lch ( ⁇ ) of the right amplifier circuit 4b when a detection signal having the same phase is output to the amplifier 4.
  • FIG. 6 is a diagram showing the magnitude relationship between the state in which the subwoofer in the third embodiment is connected to Lch (+) and Rch (+) and the output current value of the amplifier corresponding to this connection state.
  • the subwoofer 3 when the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the in-phase output terminal Rch (+) of the right amplifier circuit 4b, the same phase is detected.
  • FIG. 7 is a diagram showing the magnitude relationship between the state in which the subwoofer according to the third embodiment is connected to Lch ( ⁇ ) and Rch (+) and the output current value of the amplifier corresponding to this connection state.
  • FIG. 8 is a diagram showing the magnitude relationship between the state in which the subwoofer according to the third embodiment is connected to Lch ( ⁇ ) and Rch ( ⁇ ) and the output current value of the amplifier corresponding to this connection state.
  • the in-phase output terminal Lch of the amplifier circuits 4a and 4b is output when the determination data is output to the amplifier circuits 4a and 4b as the in-phase and anti-phase detection signals.
  • (+), Rch (+) and the magnitude relationship of each current value flowing through the negative phase output terminals Lch (-), Rch (-) correspond to the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a, 4b. It is the attached data.
  • the speaker connection determination unit 71 determines whether the subwoofer 3 is connected to the output terminals of the amplifier circuits 4a and 4b by referring to the determination data based on the comparison result by the current comparison unit 70. .
  • the subwoofer 3 connection relationship is the magnitude relationship between the output currents of the in-phase output terminals and the anti-phase output terminals of the amplifier circuits 4 a and 4 b when the phase of the detection signal output to the amplifier circuits 4 a and 4 b is changed. Can be accurately determined to which output terminal (port) of the amplifier circuits 4a and 4b the subwoofer 3 is connected. Thereby, it is possible to accurately detect not only whether or not the subwoofer 3 is connected, but also which port is erroneously connected.
  • any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .
  • the audio apparatus according to the present invention is suitable for an in-vehicle audio apparatus because it can accurately detect the connection state of a speaker embedded in a vehicle panel, for example.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

Disclosed is an audio device wherein: values of currents flowing in output terminals of amplifying circuits (4a, 4b) are compared with each other when same phase and opposite phase detection signals are outputted to the amplifying circuits (4a, 4b), respectively; and on the basis of results of the comparison, whether a subwoofer (3) is connected or not is determined on the basis of determination data obtained by associating magnitude relationship of the values of the currents with whether the subwoofer (3) is connected or not with respect to the output terminals of the amplifying circuits (4a, 4b), said currents flowing in the output terminals of the amplifying circuits (4a, 4b) when the same phase and opposite phase detection signals are outputted to the amplifying circuits (4a, 4b), respectively.

Description

オーディオ装置Audio equipment
　この発明は、スピーカの接続状態を検知する機能を有したオーディオ装置に関する。 The present invention relates to an audio apparatus having a function of detecting a connection state of speakers.
　例えば、特許文献１は、左スピーカがＢＴＬ（Ｂｒｉｄｇｅｄ　ＴｒａｎｓＬｅｓｓ）接続された左側のＢＴＬアンプの出力端子と右スピーカがＢＴＬ接続された右側のＢＴＬアンプの出力端子とに中央スピーカが接続されたオーディオ装置を開示する。
　このように構成することで、中央スピーカをＢＴＬ接続するための中央のＢＴＬアンプを設けることなく、中央スピーカからモノラル音声を出力することが可能となる。 For example, Patent Document 1 discloses an audio device in which a central speaker is connected to an output terminal of a left BTL amplifier in which a left speaker is connected to a BTL (Bridged TransLess) and an output terminal of a right BTL amplifier in which a right speaker is connected to a BTL. Is disclosed.
With this configuration, monaural sound can be output from the central speaker without providing a central BTL amplifier for BTL connection of the central speaker.
特開平５－１９９５９４号公報Japanese Patent Laid-Open No. 5-199594
　特許文献１のオーディオ装置を車載用とする場合、左右および中央の各スピーカは車両のパネル内に埋め込まれた状態となる。このため各スピーカがアンプに正しく接続されているか否かを目視で確認することができない。
　一方、従来のオーディオ装置において、２００ｍｓ程度のパルス波（直流信号、パルス信号）もしくは任意の交流波（交流信号）をアンプ側からスピーカ側に出力し、そのときに流れる電流を検出することによって、スピーカの接続有無を検出する方法が提案されている。
　しかし、この検出方法は、同一チャンネルのアンプにおける同相出力端子（＋）と逆相出力端子（－）との間に接続された負荷のインピーダンスを測定するものであり、同一チャンネルのアンプにおける同相出力端子（＋）と逆相出力端子（－）との間に接続されたスピーカのみを検出可能である。このため、左右のＢＴＬアンプの出力端子に接続された中央スピーカを検出することはできなかった。 When the audio device disclosed in Patent Document 1 is used on a vehicle, the left, right, and center speakers are embedded in a vehicle panel. For this reason, it cannot be confirmed visually whether each speaker is correctly connected to the amplifier.
On the other hand, in a conventional audio device, a pulse wave (DC signal, pulse signal) of about 200 ms or an arbitrary AC wave (AC signal) is output from the amplifier side to the speaker side, and the current flowing at that time is detected, A method for detecting whether or not a speaker is connected has been proposed.
However, this detection method measures the impedance of the load connected between the common-mode output terminal (+) and negative-phase output terminal (-) in the amplifier of the same channel. Only a speaker connected between the terminal (+) and the negative phase output terminal (−) can be detected. For this reason, the center speaker connected to the output terminals of the left and right BTL amplifiers could not be detected.
　この発明は、上記のような課題を解決するためになされたもので、左右のＢＴＬアンプの出力端子に接続されたスピーカの接続状態を的確に検出することができるオーディオ装置を得ることを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an audio device that can accurately detect the connection state of speakers connected to the output terminals of the left and right BTL amplifiers. To do.
　この発明に係るオーディオ装置は、左側の音声を出力する第１のスピーカと、第１のスピーカがＢＴＬ接続されて第１のスピーカに出力する信号を増幅する第１の増幅器と、右側の音声を出力する第２のスピーカと、第２のスピーカがＢＴＬ接続されて第２のスピーカに出力する信号を増幅する第２の増幅器と、第１および第２の増幅器の出力端子に対する第３のスピーカの接続状態を検出するオーディオ装置であって、検出用信号を発生する信号発生器と、第１の増幅器に出力する信号の位相を調整する第１の位相調整器と、第２の増幅器に出力する信号の位相を調整する第２の位相調整器と、第１の増幅器の出力端子に流れる電流を検出する第１の電流検出部と、第２の増幅器の出力端子に流れる電流を検出する第２の電流検出部と、第１および第２の位相調整器が同位相および逆位相の検出用信号を第１および第２の増幅器にそれぞれ出力したときに第１および第２の電流検出部が検出した各電流値を比較する電流比較部と、電流比較部による比較の結果に基づいて、同位相および逆位相の検出用信号を第１および第２の増幅器にそれぞれ出力したときに第１および第２の増幅器の出力端子に流れる各電流値の大小関係を、第１および第２の増幅器の出力端子に対する第３のスピーカの接続状態に対応付けた判定用データから、第３のスピーカの接続状態を判定する判定部とを備える。 An audio apparatus according to the present invention includes a first speaker that outputs left-side sound, a first amplifier that amplifies a signal output from the first speaker by BTL connection to the first speaker, and right-side sound. A second speaker for output, a second amplifier for amplifying a signal output to the second speaker by BTL connection of the second speaker, and a third speaker for the output terminals of the first and second amplifiers. An audio device for detecting a connection state, a signal generator for generating a detection signal, a first phase adjuster for adjusting a phase of a signal output to the first amplifier, and an output to the second amplifier A second phase adjuster for adjusting the phase of the signal, a first current detector for detecting a current flowing through the output terminal of the first amplifier, and a second for detecting a current flowing through the output terminal of the second amplifier. Current detector of The current values detected by the first and second current detectors are compared when the first and second phase adjusters output in-phase and anti-phase detection signals to the first and second amplifiers, respectively. Based on the comparison result of the current comparison unit and the current comparison unit, when the in-phase and anti-phase detection signals are output to the first and second amplifiers, respectively, the output terminals of the first and second amplifiers A determination unit that determines a connection state of the third speaker from determination data in which the magnitude relationship between the flowing current values is associated with the connection state of the third speaker with respect to the output terminals of the first and second amplifiers; Prepare.
　この発明によれば、左右のＢＴＬアンプの出力端子に接続されたスピーカの接続状態を的確に検出することができるという効果がある。 According to the present invention, there is an effect that it is possible to accurately detect the connection state of the speakers connected to the output terminals of the left and right BTL amplifiers.
この発明の実施の形態１に係るオーディオ装置の構成を示すブロック図である。It is a block diagram which shows the structure of the audio apparatus which concerns on Embodiment 1 of this invention. 実施の形態１に係るオーディオ装置によるスピーカ接続状態の検出処理を示すフローチャートである。4 is a flowchart showing a speaker connection state detection process by the audio apparatus according to Embodiment 1. 実施の形態１におけるスピーカ接続状態の検出処理の概要を示す図である。5 is a diagram showing an outline of a speaker connection state detection process in Embodiment 1. FIG. この発明の実施の形態２に係るオーディオ装置によるスピーカの接続状態の検出処理を示すフローチャートである。It is a flowchart which shows the detection process of the connection state of the speaker by the audio apparatus which concerns on Embodiment 2 of this invention. この発明の実施の形態３におけるサブウーファーがＬｃｈ（＋）とＲｃｈ（－）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。It is a figure which shows the magnitude relationship of the state in which the subwoofer in Embodiment 3 of this invention is connected to Lch (+) and Rch (-), and the output current value of the amplifier corresponding to this connection state. 実施の形態３におけるサブウーファーがＬｃｈ（＋）とＲｃｈ（＋）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。It is a figure which shows the magnitude relationship between the state in which the subwoofer in Embodiment 3 was connected to Lch (+) and Rch (+), and the output current value of the amplifier corresponding to this connection state. 実施の形態３におけるサブウーファーがＬｃｈ（－）とＲｃｈ（＋）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。FIG. 10 is a diagram illustrating a magnitude relationship between a state in which a subwoofer in Embodiment 3 is connected to Lch (−) and Rch (+) and an output current value of an amplifier corresponding to this connection state. 実施の形態３におけるサブウーファーがＬｃｈ（－）とＲｃｈ（－）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。FIG. 10 is a diagram illustrating a magnitude relationship between a state in which a subwoofer in Embodiment 3 is connected to Lch (−) and Rch (−) and an output current value of an amplifier corresponding to this connection state.
　以下、この発明をより詳細に説明するため、この発明を実施するための形態について、添付の図面に従って説明する。
実施の形態１．
　図１はこの発明の実施の形態１に係るオーディオ装置の構成を示すブロック図である。図１に示すオーディオ装置は、車載用のオーディオ装置であって、スピーカ１，２、サブウーファー３、アンプ４、位相調整器５ａ，５ｂ、信号発生器６および制御部７を備えて構成される。ここで、スピーカ１は、左側音声を出力する第１のスピーカであり、アンプ４の左側のアンプ回路４ａにＢＴＬ接続されている。スピーカ２は、右側音声を出力する第２のスピーカであり、アンプ４における右側のアンプ回路４ｂにＢＴＬ接続されている。また、サブウーファー３は、専用のアンプ回路を有さず、スピーカ１，２がＢＴＬ接続されたアンプ回路４ａ，４ｂの出力端子Ｌｃｈ（＋）、Ｒｃｈ（－）にそれぞれ接続される第３のスピーカである。 Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of an audio apparatus according to Embodiment 1 of the present invention. The audio device shown in FIG. 1 is an on-vehicle audio device and includes speakers 1 and 2, a subwoofer 3, an amplifier 4, phase adjusters 5 a and 5 b, a signal generator 6, and a control unit 7. . Here, the speaker 1 is a first speaker that outputs the left audio, and is BTL-connected to the amplifier circuit 4 a on the left side of the amplifier 4. The speaker 2 is a second speaker that outputs right sound, and is BTL-connected to the right amplifier circuit 4 b in the amplifier 4. Further, the subwoofer 3 does not have a dedicated amplifier circuit, and is connected to the output terminals Lch (+) and Rch (−) of the amplifier circuits 4a and 4b to which the speakers 1 and 2 are BTL-connected. It is a speaker.
　アンプ４は、左ステレオ信号および右ステレオ信号をそれぞれ増幅するアンプであり、アンプ回路４ａ，４ｂから構成される。すなわち、図１はスピーカの接続検出を行う構成のみを記載しており、アンプ回路４ａ，４ｂが位相調整器５ａ，５ｂの出力のみを入力しているが、アンプ回路４ａ，４ｂには不図示のオーディオ回路から出力された左ステレオ信号および右ステレオ信号も入力される。
　アンプ回路４ａは左ステレオ信号を増幅する第１の増幅器であって、電流検出回路４ａ－１および増幅回路４ａ－２を備える。またアンプ回路４ｂは右ステレオ信号を増幅する第２の増幅器であり、電流検出回路４ｂ－１および増幅回路４ｂ－２を備えている。 The amplifier 4 is an amplifier that amplifies the left stereo signal and the right stereo signal, and includes amplifier circuits 4a and 4b. That is, FIG. 1 only shows a configuration for detecting connection of speakers, and the amplifier circuits 4a and 4b receive only the outputs of the phase adjusters 5a and 5b, but are not shown in the amplifier circuits 4a and 4b. The left stereo signal and the right stereo signal output from the audio circuit are also input.
The amplifier circuit 4a is a first amplifier that amplifies the left stereo signal, and includes a current detection circuit 4a-1 and an amplification circuit 4a-2. The amplifier circuit 4b is a second amplifier that amplifies the right stereo signal, and includes a current detection circuit 4b-1 and an amplification circuit 4b-2.
　電流検出回路４ａ－１は、アンプ回路４ａの出力端子に流れる電流を検出する第１の電流検出部である。また、電流検出回路４ｂ－１は、アンプ回路４ｂの出力端子に流れる電流を検出する第２の電流検出部である。
　増幅回路４ａ－２は、左ステレオ信号の同相出力信号を増幅して同相出力端子Ｌｃｈ（＋）に出力し、左ステレオ信号の逆相出力信号を増幅して逆相出力端子Ｌｃｈ（－）に出力する。また増幅回路４ｂ－２は、右ステレオ信号の同相出力信号を増幅して同相出力端子Ｒｃｈ（＋）に出力し、右ステレオ信号の逆相出力信号を増幅して逆相出力端子Ｒｃｈ（－）に出力する。 The current detection circuit 4a-1 is a first current detection unit that detects a current flowing through the output terminal of the amplifier circuit 4a. The current detection circuit 4b-1 is a second current detection unit that detects a current flowing through the output terminal of the amplifier circuit 4b.
The amplifier circuit 4a-2 amplifies the in-phase output signal of the left stereo signal and outputs it to the in-phase output terminal Lch (+), amplifies the anti-phase output signal of the left stereo signal and outputs to the anti-phase output terminal Lch (−). Output. The amplifier circuit 4b-2 amplifies the in-phase output signal of the right stereo signal and outputs it to the in-phase output terminal Rch (+), amplifies the out-of-phase output signal of the right stereo signal, and outputs the anti-phase output terminal Rch (−). Output to.
　位相調整器５ａは、制御部７の指示に従って、アンプ回路４ａに出力する信号の位相を調整する第１の位相調整器である。同様に、位相調整器５ｂは、制御部７の指示に従ってアンプ回路４ｂに出力する信号の位相を調整する第２の位相調整器である。
　信号発生器６は、制御部７の指示に従って、スピーカ接続状態を検出するための検出用信号を発生する。検出用信号としては、例えば２００ｍｓ程度のパルス波（直流信号、パルス信号）もしくは任意の交流波（交流信号）が挙げられる。 The phase adjuster 5 a is a first phase adjuster that adjusts the phase of a signal output to the amplifier circuit 4 a in accordance with an instruction from the control unit 7. Similarly, the phase adjuster 5b is a second phase adjuster that adjusts the phase of a signal output to the amplifier circuit 4b in accordance with an instruction from the control unit 7.
The signal generator 6 generates a detection signal for detecting the speaker connection state in accordance with an instruction from the control unit 7. Examples of the detection signal include a pulse wave (DC signal, pulse signal) of about 200 ms or an arbitrary AC wave (AC signal).
　制御部７は、実施の形態１に係るオーディオ装置に搭載されたマイクロコンピュータによって実現され、オーディオ装置の各種制御を行う。また、制御部７は、電流比較部７０およびスピーカ接続判定部７１を備える。電流比較部７０およびスピーカ接続判定部７１は、例えば、ソフトウェアによってプログラムされたマイクロコンピュータによって実現される。 The control unit 7 is realized by a microcomputer mounted on the audio device according to Embodiment 1, and performs various controls of the audio device. The control unit 7 includes a current comparison unit 70 and a speaker connection determination unit 71. The current comparison unit 70 and the speaker connection determination unit 71 are realized by, for example, a microcomputer programmed by software.
　電流比較部７０は、同位相および逆位相の検出用信号がアンプ４にそれぞれ出力されたときにアンプ４の出力端子に流れる電流値を比較する。この比較の結果は、スピーカ接続判定部７１に出力される。
　スピーカ接続判定部７１は、電流比較部７０から入力した上記比較の結果に基づいて、サブウーファー３の接続状態を判定する判定部である。また、スピーカ接続判定部７１には、同位相および逆位相の検出用信号をアンプ４にそれぞれ出力したときにアンプ４の出力端子に流れる各電流値の大小関係を、アンプ４の出力端子に対するサブウーファー３の接続状態に対応付けた判定用データが登録されている。
　スピーカ接続判定部７１は、電流比較部７０から入力した上記比較の結果に基づいて、上記判定用データを参照することで、サブウーファー３の接続状態を判定する。 The current comparison unit 70 compares the current values flowing through the output terminals of the amplifier 4 when the in-phase and anti-phase detection signals are respectively output to the amplifier 4. The result of this comparison is output to the speaker connection determination unit 71.
The speaker connection determination unit 71 is a determination unit that determines the connection state of the subwoofer 3 based on the comparison result input from the current comparison unit 70. In addition, the speaker connection determination unit 71 indicates the magnitude relationship between the current values flowing through the output terminals of the amplifier 4 when the in-phase and anti-phase detection signals are output to the amplifier 4. Determination data associated with the connection state of the woofer 3 is registered.
The speaker connection determination unit 71 determines the connection state of the subwoofer 3 by referring to the determination data based on the comparison result input from the current comparison unit 70.
　次に動作について説明する。
　図２は、実施の形態１に係るオーディオ装置によるスピーカ接続状態の検出処理を示すフローチャートである。この図２に沿ってサブウーファー３の接続有無を検出する処理について述べる。まず、制御部７は、検出用信号を出力させるコマンドを信号発生器６に送信する。信号発生器６は、上記コマンドに従って検出用信号を発生し位相調整器５ａおよび位相調整器５ｂにそれぞれ出力する（ステップＳＴ１）。 Next, the operation will be described.
FIG. 2 is a flowchart showing speaker connection state detection processing by the audio apparatus according to Embodiment 1. A process for detecting whether or not the subwoofer 3 is connected will be described with reference to FIG. First, the control unit 7 transmits a command for outputting a detection signal to the signal generator 6. The signal generator 6 generates a detection signal in accordance with the command and outputs it to the phase adjuster 5a and the phase adjuster 5b (step ST1).
　次に、位相調整器５ａおよび位相調整器５ｂは、制御部７からの制御によって、左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と逆相出力端子Ｌｃｈ（－）との間に出力される信号が、右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）と逆相出力端子Ｒｃｈ（－）との間に出力される信号と同位相になるように、信号発生器６から入力した検出用信号の位相を調整してアンプ回路４ａおよびアンプ回路４ｂにそれぞれ出力する（ステップＳＴ２）。 Next, the phase adjuster 5a and the phase adjuster 5b are output between the common-phase output terminal Lch (+) and the negative-phase output terminal Lch (−) of the left amplifier circuit 4a under the control of the control unit 7. Detection signal input from the signal generator 6 so that the output signal is in phase with the signal output between the in-phase output terminal Rch (+) and the reverse-phase output terminal Rch (−) of the right amplifier circuit 4b. The phase of the signal for use is adjusted and output to the amplifier circuit 4a and the amplifier circuit 4b, respectively (step ST2).
　アンプ回路４ａおよびアンプ回路４ｂに同位相の検出用信号が出力されている間、電流検出回路４ａ－１は、アンプ回路４ａの同相出力端子Ｌｃｈ（＋）に流れる電流値ＩＬｐを検出し、電流検出回路４ｂ－１は、アンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に流れる電流値ＩＲｐを検出している（ステップＳＴ３）。このとき制御部７の電流比較部７０は、電流検出回路４ａ－１，４ｂ－１がそれぞれ検出した電流値ＩＬｐ，ＩＲｐを読み出して記憶する。ここで、アンプ４の左側チャンネルＬｃｈおよび右側チャンネルＲｃｈに同位相の検出用信号をそれぞれ出力したときに、電流検出回路４ａ－１が検出した電流値をＩＬｐ１とし、電流検出回路４ｂ－１が検出した電流値をＩＲｐ１とする。 While the in-phase detection signal is output to the amplifier circuit 4a and the amplifier circuit 4b, the current detection circuit 4a-1 detects the current value I Lp flowing through the in-phase output terminal Lch (+) of the amplifier circuit 4a, The current detection circuit 4b-1 detects the current value I Rp flowing through the in-phase output terminal Rch (+) of the amplifier circuit 4b (step ST3). At this time, the current comparison unit 70 of the control unit 7 reads and stores the current values I Lp and I Rp detected by the current detection circuits 4a-1 and 4b-1. Here, when the detection signal having the same phase is output to the left channel Lch and the right channel Rch of the amplifier 4, the current value detected by the current detection circuit 4a-1 is set to I Lp1 , and the current detection circuit 4b-1 Let the detected current value be I Rp1 .
　次に、位相調整器５ａおよび位相調整器５ｂは、制御部７からの制御によって、左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と逆相出力端子Ｌｃｈ（－）との間に出力される信号が、右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）と逆相出力端子Ｒｃｈ（－）との間に出力される信号と逆位相になるように、信号発生器６から入力した検出用信号の位相を調整してアンプ回路４ａおよびアンプ回路４ｂにそれぞれ出力する（ステップＳＴ４）。 Next, the phase adjuster 5a and the phase adjuster 5b are output between the common-phase output terminal Lch (+) and the negative-phase output terminal Lch (−) of the left amplifier circuit 4a under the control of the control unit 7. Detection signal input from the signal generator 6 so that the output signal is opposite in phase to the signal output between the in-phase output terminal Rch (+) and the out-of-phase output terminal Rch (−) of the right amplifier circuit 4b. The phase of the signal for use is adjusted and output to the amplifier circuit 4a and the amplifier circuit 4b, respectively (step ST4).
　アンプ回路４ａおよびアンプ回路４ｂに逆位相の検出用信号が出力されている間、電流検出回路４ａ－１は、アンプ回路４ａの同相出力端子Ｌｃｈ（＋）に流れる電流値ＩＬｐを検出し、電流検出回路４ｂ－１は、アンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に流れる電流値ＩＲｐを検出している（ステップＳＴ５）。このとき、電流比較部７０は、電流検出回路４ａ－１，４ｂ－１がそれぞれ検出した電流値ＩＬｐ，ＩＲｐを読み出す。
　ここで、アンプ４の左側チャンネルＬｃｈおよび右側チャンネルＲｃｈに逆位相の検出用信号をそれぞれ出力したときに、電流検出回路４ａ－１が検出した電流値をＩＬｐ２とし、電流検出回路４ｂ－１が検出した電流値をＩＲｐ２とする。 While the antiphase detection signal is output to the amplifier circuit 4a and the amplifier circuit 4b, the current detection circuit 4a-1 detects the current value I Lp flowing through the in-phase output terminal Lch (+) of the amplifier circuit 4a, The current detection circuit 4b-1 detects the current value I Rp flowing through the in-phase output terminal Rch (+) of the amplifier circuit 4b (step ST5). At this time, the current comparison unit 70 reads out the current values I Lp and I Rp detected by the current detection circuits 4a-1 and 4b-1.
Here, the current value detected by the current detection circuit 4a-1 when an antiphase detection signal is output to the left channel Lch and the right channel Rch of the amplifier 4 is defined as I Lp2 , and the current detection circuit 4b-1 Let the detected current value be I Rp2 .
　電流比較部７０は、上記検出用信号が同位相であるときの電流値ＩＬｐ１，ＩＲｐ１と上記検出用信号が逆位相であるときの電流値ＩＬｐ２，ＩＲｐ２とを大小比較する。この比較の結果はスピーカ接続判定部７１に出力される。
　スピーカ接続判定部７１は、電流比較部７０による上記比較の結果に基づいて、同位相および逆位相の上記検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる各電流値の大小関係がサブウーファー３の接続有無に対応付けられた判定用データを参照する。このとき、同相出力端子Ｌｃｈ（＋）に流れる電流値ＩＬｐ１と電流値ＩＬｐ２が等しく、かつ同相出力端子Ｒｃｈ（＋）に流れる電流値ＩＲｐ１と電流値ＩＲｐ２が等しい場合（ステップＳＴ６；ＹＥＳ）、スピーカ接続判定部７１は、サブウーファー３がオープン状態であると判定する（ステップＳＴ７）。また、電流値ＩＬｐ１が電流値ＩＬｐ２，ＩＲｐ２よりも大きい場合（ステップＳＴ６；ＮＯ）、サブウーファー３が正常に接続している状態であると判定する（ステップＳＴ８）。 The current comparison unit 70 compares the current values I Lp1 and I Rp1 when the detection signals are in phase with the current values I Lp2 and I Rp2 when the detection signals are in reverse phase. The result of this comparison is output to the speaker connection determination unit 71.
The speaker connection determination unit 71 outputs the in-phase outputs of the amplifier circuits 4a and 4b when the detection signals having the same phase and the opposite phase are output to the amplifier circuits 4a and 4b based on the result of the comparison by the current comparison unit 70, respectively. The determination data associated with the presence / absence of connection of the subwoofer 3 is referred to by the magnitude relationship between the current values flowing through the terminals Lch (+) and Rch (+). At this time, when the current value I Lp1 flowing through the in-phase output terminal Lch (+) is equal to the current value I Lp2 and the current value I Rp1 flowing through the common-mode output terminal Rch (+) is equal to the current value I Rp2 (step ST6; YES), the speaker connection determination unit 71 determines that the subwoofer 3 is in the open state (step ST7). When current value I Lp1 is larger than current values I Lp2 and I Rp2 (step ST6; NO), it is determined that subwoofer 3 is in a normally connected state (step ST8).
　図３は実施の形態１におけるスピーカ接続状態の検出処理の概要を示す図である。図３（ａ）は検出用信号を同位相でアンプ４に出力した場合を示しており、図３（ｂ）は検出用信号を逆位相でアンプ４に出力した場合を示している。サブウーファー３の同相入力端子は左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）に接続し、逆相入力端子は右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続されている。 FIG. 3 is a diagram showing an outline of the speaker connection state detection process in the first embodiment. FIG. 3A shows a case where the detection signal is output to the amplifier 4 with the same phase, and FIG. 3B shows a case where the detection signal is output to the amplifier 4 with the opposite phase. The in-phase input terminal of the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a, and the opposite phase input terminal is connected to the opposite phase output terminal Rch (−) of the right amplifier circuit 4b.
　図３（ａ）に示すように、アンプ４の左側チャンネルＬｃｈと右側チャンネルＲｃｈに同位相の信号を出力した場合、サブウーファー３からは、アンプ回路４ａの同相出力端子Ｌｃｈ（＋）とアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）の電位差が音信号として出力され、電位が高いＬｃｈ（＋）側からサブウーファー３に流れる分の電流が発生する。
　一方、アンプ４の左側チャンネルＬｃｈと右側チャンネルＲｃｈに逆位相の信号を出力した場合、図３（ｂ）に示すようにアンプ回路４ａの同相出力端子Ｌｃｈ（＋）とアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）の電位差がなくなるため、サブウーファー３からは音が出力されず、電流も流れない。 As shown in FIG. 3A, when a signal having the same phase is output to the left channel Lch and the right channel Rch of the amplifier 4, the subwoofer 3 outputs the in-phase output terminal Lch (+) of the amplifier circuit 4a and the amplifier circuit. The potential difference of the reverse phase output terminal Rch (−) of 4b is output as a sound signal, and a current corresponding to the subwoofer 3 flowing from the Lch (+) side having a high potential is generated.
On the other hand, when signals having opposite phases are output to the left channel Lch and the right channel Rch of the amplifier 4, as shown in FIG. 3B, the in-phase output terminal Lch (+) of the amplifier circuit 4a and the opposite phase output of the amplifier circuit 4b. Since there is no potential difference between the terminals Rch (−), no sound is output from the subwoofer 3 and no current flows.
　すなわち、左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）にサブウーファー３の同相入力端子と逆相入力端子が正常に接続されていれば、上記検出用信号が同位相である場合、電位が高いＬｃｈ（＋）側からサブウーファー３に流れる分の電流が発生するので、電流値ＩＬｐ１は、電流値ＩＬｐ２，ＩＲｐ２よりも大きくなる（ＩＬｐ１＞ＩＬｐ２，ＩＲｐ２）。
　一方、サブウーファー３が正常に接続しておらず、オープン状態である場合には、上記検出用信号が同位相であるか、逆位相であるかによらず、Ｌｃｈ（＋）とＲｃｈ（－）で電位差が発生しないことから、電流値ＩＬｐ１と電流値ＩＬｐ２が等しく、かつ、電流値ＩＲｐ１と電流値ＩＲｐ２が等しくなる。スピーカ接続判定部７１には、このような対応関係を示す判定用データが予め設定されており、電流比較部７０による比較の結果に基づいて上記判定用データを参照することで、サブウーファー３の接続有無を判定することができる。 That is, the in-phase input terminal and the out-of-phase input terminal of the subwoofer 3 are normally connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the out-of-phase output terminal Rch (−) of the right amplifier circuit 4b. For example, when the detection signals have the same phase, a current corresponding to the Lch (+) side having a high potential flows to the subwoofer 3, so the current value I Lp1 is greater than the current values I Lp2 and I Rp2. It becomes larger (I Lp1 > I Lp2 , I Rp2 ).
On the other hand, when the subwoofer 3 is not normally connected and is in the open state, Lch (+) and Rch (−) regardless of whether the detection signal has the same phase or an opposite phase. ), The current value I Lp1 and the current value I Lp2 are equal, and the current value I Rp1 and the current value I Rp2 are equal. In the speaker connection determination unit 71, determination data indicating such a correspondence relationship is set in advance, and by referring to the determination data based on the comparison result by the current comparison unit 70, the subwoofer 3 The presence or absence of connection can be determined.
　以上のように、この実施の形態１によれば、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの出力端子に流れる各電流値を比較し、この比較の結果に基づいて、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの出力端子に流れる各電流値の大小関係を、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続状態に対応付けた判定用データから、サブウーファー３の接続状態を判定する。
　特に、判定用データが、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相の出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）同士に流れる各電流値の大小関係がアンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続有無に対応付けられたデータであり、スピーカ接続判定部７１が、電流比較部７０による比較の結果に基づいて判定用データを参照することで、アンプ回路４ａ，４ｂの出力端子とサブウーファー３との接続の有無を判定する。
　このように構成することで、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続有無を的確に検出することができる。 As described above, according to the first embodiment, the current values flowing through the output terminals of the amplifier circuits 4a and 4b when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b are compared. Based on the result of this comparison, when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, the magnitude relationship between the current values flowing in the output terminals of the amplifier circuits 4a and 4b is The connection state of the subwoofer 3 is determined from the determination data associated with the connection state of the subwoofer 3 with respect to the output terminals of the circuits 4a and 4b.
In particular, determination data flows between the in-phase output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively. The magnitude relationship between the current values is data associated with whether or not the subwoofer 3 is connected to the output terminals of the amplifier circuits 4 a and 4 b, and the speaker connection determination unit 71 determines based on the comparison result by the current comparison unit 70. By referring to the data for use, it is determined whether or not the output terminals of the amplifier circuits 4a and 4b and the subwoofer 3 are connected.
With this configuration, it is possible to accurately detect whether or not the subwoofer 3 is connected to the output terminals of the amplifier circuits 4a and 4b.
　なお、上記説明では、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる電流値を比較する場合を示したが、これに限定されるものではない。
　例えば、スピーカ接続判定部７１が、アンプ回路４ａ，４ｂの逆相出力端子Ｌｃｈ（－），Ｒｃｈ（－）に流れる各電流値の大小関係を、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続有無に対応付けた判定用データを参照することで、サブウーファー３の接続有無を判定してもよい。 In the above description, the current values flowing in the in-phase output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b when the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively. Although the case of comparison is shown, the present invention is not limited to this.
For example, the loudspeaker connection determination unit 71 determines the magnitude relationship between the current values flowing through the antiphase output terminals Lch (−) and Rch (−) of the amplifier circuits 4a and 4b, and the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b. Whether or not the subwoofer 3 is connected may be determined by referring to the determination data associated with the presence or absence of the connection.
実施の形態２．
　実施の形態２におけるスピーカ接続判定部７１には、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる各電流値の大小関係が、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続関係に対応付けられた判定用データが設定されている。これにより、スピーカ接続判定部７１は、上述した判定用データを電流比較部７０による比較の結果に基づいて参照することで、サブウーファー３がアンプ４のいずれの出力端子に接続しているかを判定することができる。 Embodiment 2. FIG.
The speaker connection determination unit 71 according to the second embodiment outputs in-phase output terminals Lch (+) and Rch () of the amplifier circuits 4a and 4b when in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively. The determination data in which the magnitude relationship between the current values flowing in (+) is associated with the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a and 4b is set. As a result, the speaker connection determination unit 71 determines which output terminal of the amplifier 4 the subwoofer 3 is connected to by referring to the determination data described above based on the comparison result by the current comparison unit 70. can do.
　図４はこの発明の実施の形態２に係るオーディオ装置によるスピーカの接続状態の検出処理を示すフローチャートである。実施の形態２では、実施の形態１と同様にアンプ回路４ａ，４ｂの同相出力端子に流れる電流を検出し、アンプ回路４ａ，４ｂに同位相および逆位相の検出用信号を出力したときにアンプ回路４ａ，４ｂの同相出力端子に流れる各電流値の大小比較結果に基づいて、サブウーファー３がアンプ４のいずれの出力端子に接続しているかを判定する。 FIG. 4 is a flowchart showing speaker connection state detection processing by the audio apparatus according to Embodiment 2 of the present invention. In the second embodiment, the current flowing through the in-phase output terminals of the amplifier circuits 4a and 4b is detected as in the first embodiment, and the in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b. It is determined which output terminal of the amplifier 4 the subwoofer 3 is connected to based on the result of comparing the magnitudes of the current values flowing through the common-mode output terminals of the circuits 4a and 4b.
　まず、スピーカ接続判定部７１は、上記実施の形態１と同様にして、サブウーファー３が正常に接続した状態であることを確認する（ステップＳＴ１ａ）。すなわち、電流比較部７０による比較の結果がＩＬｐ１＞ＩＬｐ２，ＩＲｐ２の状態であれば、サブウーファー３は正常に接続している。
　サブウーファー３が正常に接続している場合において、電流比較部７０による比較の結果がさらにＩＬｐ１＞ＩＲｐ１＝ＩＬｐ２＝ＩＲｐ２であれば（ステップＳＴ２ａ；ＹＥＳ）、スピーカ接続判定部７１は、上記判定用データを参照して、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続していると判定する（ステップＳＴ３ａ）。 First, the speaker connection determination unit 71 confirms that the subwoofer 3 is normally connected in the same manner as in the first embodiment (step ST1a). That is, if the result of comparison by the current comparison unit 70 is in the state of I Lp1 > I Lp2 , I Rp2 , the subwoofer 3 is normally connected.
When the subwoofer 3 is normally connected, if the comparison result by the current comparison unit 70 is further I Lp1 > I Rp1 = I Lp2 = I Rp2 (step ST2a; YES), the speaker connection determination unit 71 Referring to the determination data, it is determined that the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the opposite-phase output terminal Rch (−) of the right amplifier circuit 4b. (Step ST3a).
　また、電流比較部７０による比較の結果がＩＬｐ１＞ＩＲｐ１＝ＩＬｐ２＝ＩＲｐ２ではない場合（ステップＳＴ２ａ；ＮＯ）、スピーカ接続判定部７１は、電流比較部７０による比較の結果がＩＬｐ２＞ＩＬｐ１＝ＩＲｐ１＝ＩＲｐ２であれば（ステップＳＴ４ａ；ＹＥＳ）、上記判定用データを参照して、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）とに接続していると判定する（ステップＳＴ５ａ）。 When the comparison result by the current comparison unit 70 is not I Lp1 > I Rp1 = I Lp2 = I Rp2 (step ST2a; NO), the speaker connection determination unit 71 determines that the comparison result by the current comparison unit 70 is I Lp2 If> I Lp1 = I Rp1 = I Rp2 (step ST4a; YES), referring to the determination data, the subwoofer 3 is connected to the common-mode output terminal Lch (+) of the left amplifier circuit 4a and the right amplifier circuit. It is determined that it is connected to the in-phase output terminal Rch (+) of 4b (step ST5a).
　一方、電流比較部７０による比較の結果がＩＬｐ２＞ＩＬｐ１＝ＩＲｐ１＝ＩＲｐ２ではない場合（ステップＳＴ４ａ；ＮＯ）、スピーカ接続判定部７１は、ステップＳＴ３ａおよびステップＳＴ５ａの判定結果以外の接続関係でサブウーファー３が接続されていると判定する（ステップＳＴ６ａ）。例えば、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）とに接続している、もしくは、左側のアンプ回路４ａの同相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（－）とに接続していることが考えられる。 On the other hand, when the result of comparison by the current comparison unit 70 is not I Lp2 > I Lp1 = I Rp1 = I Rp2 (step ST4a; NO), the speaker connection determination unit 71 connects other than the determination results of step ST3a and step ST5a. It is determined that the subwoofer 3 is connected because of the relationship (step ST6a). For example, the subwoofer 3 is connected to the common-mode output terminal Lch (−) of the left amplifier circuit 4a and the common-mode output terminal Rch (+) of the right amplifier circuit 4b, or the common-mode output of the left amplifier circuit 4a. It is conceivable that the terminal Lch (−) is connected to the common-mode output terminal Rch (−) of the right amplifier circuit 4b.
　以上のように、この実施の形態２によれば、判定用データが、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる各電流値の大小関係が、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続関係に対応付けられたデータである。
　スピーカ接続判定部７１は、電流比較部７０による比較の結果に基づいて上記判定用データを参照することで、サブウーファー３がアンプ回路４ａ，４ｂのいずれの出力端子に接続しているかを判定する。
　このように、アンプ回路４ａ，４ｂへ出力する検出用信号の位相を変えた場合におけるアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる各電流値の大小関係がサブウーファー３の接続関係によって変化することを利用すれば、上述のように限定的ではあるが、サブウーファー３がアンプ回路４ａ，４ｂのどの出力端子（ポート）に接続しているかを判定することができる。これにより、サブウーファー３が接続されているか否かだけでなく、どのポートに誤接続されているのかを大まかに判断することができる。 As described above, according to the second embodiment, the in-phase output terminal Lch of the amplifier circuits 4a and 4b is output when the determination data is output to the amplifier circuits 4a and 4b, respectively. The magnitude relationship between the current values flowing through (+) and Rch (+) is data associated with the connection relationship of the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b.
The speaker connection determination unit 71 determines whether the subwoofer 3 is connected to the output terminals of the amplifier circuits 4a and 4b by referring to the determination data based on the comparison result by the current comparison unit 70. .
As described above, when the phase of the detection signal output to the amplifier circuits 4a and 4b is changed, the magnitude relationship between the current values flowing through the common-mode output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b is sub. If the change depending on the connection relationship of the woofer 3 is used, although it is limited as described above, it is possible to determine which output terminal (port) of the amplifier circuits 4a and 4b the subwoofer 3 is connected to. it can. Thereby, it is possible to roughly determine not only whether or not the subwoofer 3 is connected, but which port is erroneously connected.
　なお、上記実施の形態２では、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）に流れる電流値を比較する場合を示したが、これに限定されるものではない。
　例えば、スピーカ接続判定部７１が、アンプ回路４ａ，４ｂの逆相出力端子Ｌｃｈ（－），Ｒｃｈ（－）に流れる各電流値の大小関係を、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続関係に対応付けた判定用データを参照することで、サブウーファー３の接続関係を判定してもよい。 In the second embodiment, when in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, they flow to the in-phase output terminals Lch (+) and Rch (+) of the amplifier circuits 4a and 4b. Although the case where the current values are compared is shown, the present invention is not limited to this.
For example, the loudspeaker connection determination unit 71 determines the magnitude relationship between the current values flowing through the antiphase output terminals Lch (−) and Rch (−) of the amplifier circuits 4a and 4b, and the subwoofer 3 with respect to the output terminals of the amplifier circuits 4a and 4b. The connection relationship of the subwoofer 3 may be determined by referring to the determination data associated with the connection relationship.
実施の形態３．
　実施の形態３におけるスピーカ接続判定部７１には、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）および逆相出力端子Ｌｃｈ（－），Ｒｃｈ（－）の双方に流れる各電流値の大小関係が、アンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続関係に対応付けられた判定用データが設定されている。これにより、スピーカ接続判定部７１は、上述した判定用データを電流比較部７０による比較の結果に基づいて参照することで、サブウーファー３がアンプ４のいずれの出力端子に接続しているかを正確に判定することができる。 Embodiment 3 FIG.
In the speaker connection determination unit 71 according to the third embodiment, the in-phase output terminals Lch (+) and Rch (of the amplifier circuits 4a and 4b are output when in-phase and anti-phase detection signals are output to the amplifier circuits 4a and 4b, respectively. (+) And the magnitude relationship between the current values flowing through both the negative phase output terminals Lch (−) and Rch (−) are determined in correspondence with the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a and 4b. Data is set. Accordingly, the speaker connection determination unit 71 refers to the determination data described above based on the result of comparison by the current comparison unit 70, thereby accurately determining which output terminal of the amplifier 4 the subwoofer 3 is connected to. Can be determined.
　図５は、実施の形態３におけるサブウーファーがＬｃｈ（＋）とＲｃｈ（－）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。図５に示すように、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続している場合、同位相の検出用信号をアンプ４に出力すると、電流値はＩＬｐ１＝ＩＲｎ１＞ＩＬｎ１＝ＩＲｐ１といった関係になる。ただし、電流ＩＬｎ１は同位相の検出用信号をアンプ４に出力したときに左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）に流れる電流である。電流ＩＲｎ１は同位相の検出用信号をアンプ４に出力したときに右側のアンプ回路４ｂの逆相出力端子Ｌｃｈ（－）に流れる電流である。 FIG. 5 is a diagram showing the magnitude relationship between the state in which the subwoofer in the third embodiment is connected to Lch (+) and Rch (−) and the output current value of the amplifier corresponding to this connection state. As shown in FIG. 5, when the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the opposite-phase output terminal Rch (−) of the right amplifier circuit 4b, the same phase is detected. When the signal for use is output to the amplifier 4, the current value has a relationship of I Lp1 = I Rn1 > I Ln1 = I Rp1 . However, the current I Ln1 is a current that flows to the negative-phase output terminal Lch (−) of the left amplifier circuit 4a when the detection signal having the same phase is output to the amplifier 4. The current I Rn1 is a current that flows to the negative phase output terminal Lch (−) of the right amplifier circuit 4b when the detection signal having the same phase is output to the amplifier 4.
　また、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続している場合において、逆位相の検出用信号をアンプ４に出力すると、電流値はＩＬｐ２＝ＩＲｐ２＝ＩＬｎ２＝ＩＲｎ２という関係になる。ただし、電流ＩＬｎ２は、逆位相の検出用信号をアンプ４に出力したときに左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）に流れる電流である。電流ＩＲｎ２は、同位相の検出用信号をアンプ４に出力したときに右側のアンプ回路４ｂの逆相出力端子Ｌｃｈ（－）に流れる電流である。 Further, when the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the opposite-phase output terminal Rch (−) of the right amplifier circuit 4b, the signal for detecting the opposite phase is amplified. When the output 4, the current value becomes the relationship that I Lp2 = I Rp2 = I Ln2 = I Rn2. However, the current ILn2 is a current that flows through the antiphase output terminal Lch (−) of the left amplifier circuit 4a when the antiphase detection signal is output to the amplifier 4. The current I Rn2 is a current that flows to the negative-phase output terminal Lch (−) of the right amplifier circuit 4b when a detection signal having the same phase is output to the amplifier 4.
　スピーカ接続判定部７１は、電流比較部７０による比較の結果が、同位相の検出用信号をアンプ４に出力したときにＩＬｐ１＝ＩＲｎ１＞ＩＬｎ１＝ＩＲｐ１となり、逆位相の検出用信号をアンプ４に出力したときにＩＬｐ２＝ＩＲｐ２＝ＩＬｎ２＝ＩＲｎ２の関係であった場合に、これらの電流値の大小関係に基づいて判定用データを参照することで、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続していると判定する。 When the comparison result by the current comparison unit 70 is output to the amplifier 4 as a detection signal having the same phase, the speaker connection determination unit 71 becomes I Lp1 = I Rn1 > I Ln1 = I Rp1 , and the detection signal of the opposite phase the when was the relationship I Lp2 = I Rp2 = I Ln2 = I Rn2 when output to the amplifier 4, the reference to the judgment data based on a magnitude relation between these current values, the subwoofer 3 It is determined that the same phase output terminal Lch (+) of the left amplifier circuit 4a is connected to the opposite phase output terminal Rch (−) of the right amplifier circuit 4b.
　図６は、実施の形態３におけるサブウーファーがＬｃｈ（＋）とＲｃｈ（＋）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。図６に示すように、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に接続している場合、同位相の検出用信号をアンプ４に出力すると、電流値はＩＬｐ１＝ＩＲｐ１＝ＩＬｎ１＝ＩＲｎ１といった関係になる。一方、逆位相の検出用信号をアンプ４に出力すると、電流値はＩＬｐ２＝ＩＲｐ２＞ＩＬｎ２＝ＩＲｎ２といった関係になる。 FIG. 6 is a diagram showing the magnitude relationship between the state in which the subwoofer in the third embodiment is connected to Lch (+) and Rch (+) and the output current value of the amplifier corresponding to this connection state. As shown in FIG. 6, when the subwoofer 3 is connected to the in-phase output terminal Lch (+) of the left amplifier circuit 4a and the in-phase output terminal Rch (+) of the right amplifier circuit 4b, the same phase is detected. When a signal is output to the amplifier 4, the current value has a relationship of I Lp1 = I Rp1 = I Ln1 = I Rn1 . On the other hand, when the output detection signal of the opposite phase to the amplifier 4, the current value is a relation such I Lp2 = I Rp2> I Ln2 = I Rn2.
　スピーカ接続判定部７１は、電流比較部７０による比較の結果が、同位相の検出用信号をアンプ４に出力したときにＩＬｐ１＝ＩＲｐ１＝ＩＬｎ１＝ＩＲｎ１となり、逆位相の検出用信号をアンプ４に出力したときにＩＬｐ２＝ＩＲｐ２＞ＩＬｎ２＝ＩＲｎ２の関係であった場合に、これらの電流値の大小関係に基づいて判定用データを参照することで、サブウーファー３が左側のアンプ回路４ａの同相出力端子Ｌｃｈ（＋）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に接続していると判定する。 When the comparison result by the current comparison unit 70 is output to the amplifier 4 as the result of comparison by the current comparison unit 70, the speaker connection determination unit 71 becomes I Lp1 = I Rp1 = I Ln1 = I Rn1 , and the detection signal of the opposite phase the when was the relationship I Lp2 = I Rp2> I Ln2 = I Rn2 when output to the amplifier 4, the reference to the judgment data based on a magnitude relation between these current values, the subwoofer 3 It is determined that the common mode output terminal Lch (+) of the left amplifier circuit 4a is connected to the common mode output terminal Rch (+) of the right amplifier circuit 4b.
　図７は、実施の形態３におけるサブウーファーがＬｃｈ（－）とＲｃｈ（＋）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。図７に示すように、サブウーファー３が左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に接続している場合に、同位相の検出用信号をアンプ４に出力すると、電流値はＩＬｎ１＝ＩＲｐ１＞ＩＬｐ１＝ＩＲｎ１といった関係になる。また逆位相の検出用信号をアンプ４に出力した場合、電流値はＩＬｐ２＝ＩＲｐ２＝ＩＬｎ２＝ＩＲｎ２という関係になる。 FIG. 7 is a diagram showing the magnitude relationship between the state in which the subwoofer according to the third embodiment is connected to Lch (−) and Rch (+) and the output current value of the amplifier corresponding to this connection state. As shown in FIG. 7, when the subwoofer 3 is connected to the opposite phase output terminal Lch (−) of the left amplifier circuit 4a and the same phase output terminal Rch (+) of the right amplifier circuit 4b, When the detection signal is output to the amplifier 4, the current value has a relationship of I Ln1 = I Rp1 > I Lp1 = I Rn1 . The case of outputting a detection signal of the opposite phase to the amplifier 4, the current value becomes the relationship that I Lp2 = I Rp2 = I Ln2 = I Rn2.
　スピーカ接続判定部７１は、電流比較部７０による比較の結果が、同位相の検出用信号をアンプ４に出力したときにＩＬｎ１＝ＩＲｐ１＞ＩＬｐ１＝ＩＲｎ１となり、逆位相の検出用信号をアンプ４に出力したときにＩＬｐ２＝ＩＲｐ２＝ＩＬｎ２＝ＩＲｎ２の関係であった場合に、これらの電流値の大小関係に基づいて判定用データを参照することで、サブウーファー３が左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの同相出力端子Ｒｃｈ（＋）に接続していると判定する。 When the comparison result by the current comparison unit 70 is output to the amplifier 4 as a result of comparison by the current comparison unit 70, the speaker connection determination unit 71 becomes I Ln1 = I Rp1 > I Lp1 = I Rn1 , and the detection signal of the opposite phase the when was the relationship I Lp2 = I Rp2 = I Ln2 = I Rn2 when output to the amplifier 4, the reference to the judgment data based on a magnitude relation between these current values, the subwoofer 3 It is determined that the negative-phase output terminal Lch (−) of the left amplifier circuit 4a is connected to the common-phase output terminal Rch (+) of the right amplifier circuit 4b.
　図８は、実施の形態３におけるサブウーファーがＬｃｈ（－）とＲｃｈ（－）に接続された状態とこの接続状態に対応するアンプの出力電流値の大小関係を示す図である。図８に示すように、サブウーファー３が左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続している場合、同位相の検出用信号をアンプ４に出力すると、電流値はＩＬｐ１＝ＩＲｐ１＝ＩＬｎ１＝ＩＲｎ１という関係になる。また、逆位相の検出用信号をアンプ４に出力した場合、電流値はＩＬｎ２＝ＩＲｎ２＞ＩＬｐ２＝ＩＲｐ２という関係になる。 FIG. 8 is a diagram showing the magnitude relationship between the state in which the subwoofer according to the third embodiment is connected to Lch (−) and Rch (−) and the output current value of the amplifier corresponding to this connection state. As shown in FIG. 8, when the subwoofer 3 is connected to the negative phase output terminal Lch (−) of the left amplifier circuit 4a and the negative phase output terminal Rch (−) of the right amplifier circuit 4b, When the detection signal is output to the amplifier 4, the current value has a relationship of I Lp1 = I Rp1 = I Ln1 = I Rn1 . In addition, when outputting a detection signal of the opposite phase to the amplifier 4, the current value becomes the relationship that I Ln2 = I Rn2> I Lp2 = I Rp2.
　スピーカ接続判定部７１は、電流比較部７０による比較の結果が、同位相の検出用信号をアンプ４に出力したときにＩＬｐ１＝ＩＲｐ１＝ＩＬｎ１＝ＩＲｎ１となり、逆位相の検出用信号をアンプ４に出力したときにＩＬｎ２＝ＩＲｎ２＞ＩＬｐ２＝ＩＲｐ２の関係であった場合に、これらの電流値の大小関係に基づいて判定用データを参照することで、サブウーファー３が左側のアンプ回路４ａの逆相出力端子Ｌｃｈ（－）と右側のアンプ回路４ｂの逆相出力端子Ｒｃｈ（－）に接続していると判定する。 When the comparison result by the current comparison unit 70 is output to the amplifier 4 as the result of comparison by the current comparison unit 70, the speaker connection determination unit 71 becomes I Lp1 = I Rp1 = I Ln1 = I Rn1 , and the detection signal of the opposite phase the when was the relationship I Ln2 = I Rn2> I Lp2 = I Rp2 when output to the amplifier 4, the reference to the judgment data based on a magnitude relation between these current values, the subwoofer 3 It is determined that the negative phase output terminal Lch (−) of the left amplifier circuit 4a is connected to the negative phase output terminal Rch (−) of the right amplifier circuit 4b.
　以上のように、この実施の形態３によれば、判定用データが、同位相および逆位相の検出用信号をアンプ回路４ａ，４ｂにそれぞれ出力したときにアンプ回路４ａ，４ｂの同相出力端子Ｌｃｈ（＋），Ｒｃｈ（＋）および逆相出力端子Ｌｃｈ（－），Ｒｃｈ（－）の双方に流れる各電流値の大小関係がアンプ回路４ａ，４ｂの出力端子に対するサブウーファー３の接続関係に対応付けられたデータである。スピーカ接続判定部７１は、電流比較部７０による比較の結果に基づいて上記判定用データを参照することで、サブウーファー３がアンプ回路４ａ，４ｂのいずれの出力端子に接続しているかを判定する。
　このようにアンプ回路４ａ，４ｂへ出力する検出用信号の位相を変えた場合におけるアンプ回路４ａ，４ｂの同相出力端子同士および逆相出力端子同士の出力電流の大小関係がサブウーファー３の接続関係によって変化することを利用すれば、サブウーファー３がアンプ回路４ａ，４ｂのどの出力端子（ポート）に接続しているかを正確に判定することができる。これにより、サブウーファー３が接続されているか否かだけでなく、どのポートに誤接続されているのかを正確に検出可能である。 As described above, according to the third embodiment, the in-phase output terminal Lch of the amplifier circuits 4a and 4b is output when the determination data is output to the amplifier circuits 4a and 4b as the in-phase and anti-phase detection signals. (+), Rch (+) and the magnitude relationship of each current value flowing through the negative phase output terminals Lch (-), Rch (-) correspond to the connection relationship of the subwoofer 3 to the output terminals of the amplifier circuits 4a, 4b. It is the attached data. The speaker connection determination unit 71 determines whether the subwoofer 3 is connected to the output terminals of the amplifier circuits 4a and 4b by referring to the determination data based on the comparison result by the current comparison unit 70. .
Thus, the subwoofer 3 connection relationship is the magnitude relationship between the output currents of the in-phase output terminals and the anti-phase output terminals of the amplifier circuits 4 a and 4 b when the phase of the detection signal output to the amplifier circuits 4 a and 4 b is changed. Can be accurately determined to which output terminal (port) of the amplifier circuits 4a and 4b the subwoofer 3 is connected. Thereby, it is possible to accurately detect not only whether or not the subwoofer 3 is connected, but also which port is erroneously connected.
　なお、本発明はその発明の範囲内において、各実施の形態の自由な組み合わせ、あるいは各実施の形態の任意の構成要素の変形、もしくは各実施の形態において任意の構成要素の省略が可能である。 In the present invention, within the scope of the invention, any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .
　この発明に係るオーディオ装置は、例えば、車両のパネル内に埋め込まれたスピーカの接続状態を的確に検出することができるので、車載用のオーディオ装置に好適である。 The audio apparatus according to the present invention is suitable for an in-vehicle audio apparatus because it can accurately detect the connection state of a speaker embedded in a vehicle panel, for example.
　１，２　スピーカ、３　サブウーファー、４　アンプ、４ａ，４ｂ　アンプ回路、４ａ－１，４ｂ－１　電流検出回路、４ａ－２，４ｂ－２　増幅回路、５ａ，５ｂ　位相調整器、６　信号発生器、７　制御部、７０　電流比較部、７１　スピーカ接続判定部。 1, 2 speaker, 3 subwoofer, 4 amplifier, 4a, 4b amplifier circuit, 4a-1, 4b-1 current detection circuit, 4a-2, 4b-2 amplification circuit, 5a, 5b phase adjuster, 6 signal generator 7, control unit, 70 current comparison unit, 71 speaker connection determination unit.

Claims (3)

  1. 　左側の音声を出力する第１のスピーカと、前記第１のスピーカがＢＴＬ接続されて前記第１のスピーカに出力する信号を増幅する第１の増幅器と、右側の音声を出力する第２のスピーカと、前記第２のスピーカがＢＴＬ接続されて前記第２のスピーカに出力する信号を増幅する第２の増幅器と、前記第１および前記第２の増幅器の出力端子に対する第３のスピーカの接続状態を検出するオーディオ装置であって、
    　検出用信号を発生する信号発生器と、
    　前記第１の増幅器に出力する信号の位相を調整する第１の位相調整器と、
    　前記第２の増幅器に出力する信号の位相を調整する第２の位相調整器と、
    　前記第１の増幅器の出力端子に流れる電流を検出する第１の電流検出部と、
    　前記第２の増幅器の出力端子に流れる電流を検出する第２の電流検出部と、
    　前記第１および前記第２の位相調整器が同位相および逆位相の前記検出用信号を前記第１および前記第２の増幅器にそれぞれ出力したときに前記第１および前記第２の電流検出部が検出した各電流値を比較する電流比較部と、
    　前記電流比較部による比較の結果に基づいて、同位相および逆位相の前記検出用信号を前記第１および前記第２の増幅器にそれぞれ出力したときに前記第１および前記第２の増幅器の出力端子に流れる各電流値の大小関係を、前記第１および前記第２の増幅器の出力端子に対する前記第３のスピーカの接続状態に対応付けた判定用データから、前記第３のスピーカの接続状態を判定する判定部とを備えるオーディオ装置。     A first speaker that outputs the left audio, a first amplifier that amplifies a signal output to the first speaker by BTL connection of the first speaker, and a second speaker that outputs the right audio A second amplifier for amplifying a signal output to the second speaker when the second speaker is BTL-connected, and a connection state of the third speaker to the output terminals of the first and second amplifiers An audio device for detecting
    A signal generator for generating a detection signal;
    A first phase adjuster for adjusting a phase of a signal output to the first amplifier;
    A second phase adjuster for adjusting a phase of a signal output to the second amplifier;
    A first current detector for detecting a current flowing through an output terminal of the first amplifier;
    A second current detector for detecting a current flowing through the output terminal of the second amplifier;
    When the first and second phase adjusters output the in-phase and anti-phase detection signals to the first and second amplifiers, the first and second current detection units A current comparison unit for comparing each detected current value;
    Output terminals of the first and second amplifiers when the detection signals having the same phase and the opposite phase are output to the first and second amplifiers based on the result of comparison by the current comparison unit, respectively. The connection state of the third speaker is determined from determination data in which the magnitude relationship between the current values flowing in the first and second amplifiers is associated with the connection state of the third speaker with respect to the output terminals of the first and second amplifiers. An audio device comprising: a determination unit for performing.
  2. 　前記判定用データは、同位相および逆位相の前記検出用信号を前記第１および前記第２の増幅器にそれぞれ出力したときに前記第１および前記第２の増幅器の同相の出力端子同士および逆相の出力端子同士のいずれか一方に流れる各電流値の大小関係が前記第１および前記第２の増幅器の前記出力端子に対する前記第３のスピーカの接続有無に対応付けられたデータであり、
    　前記判定部は、前記電流比較部による比較の結果に基づいて前記判定用データを参照することで、前記第１および前記第２の増幅器の出力端子と前記第３のスピーカとの接続の有無を判定することを特徴とする請求項１記載のオーディオ装置。     The determination data includes in-phase output terminals of the first and second amplifiers and anti-phase signals when the detection signals having the same phase and opposite phase are output to the first and second amplifiers, respectively. The magnitude relationship of each current value flowing through one of the output terminals of the first and second amplifiers is data associated with the presence or absence of connection of the third speaker to the output terminal of the first and second amplifiers,
    The determination unit refers to the determination data based on a comparison result by the current comparison unit, thereby determining whether or not the output terminal of the first and second amplifiers is connected to the third speaker. The audio device according to claim 1, wherein the determination is performed.
  3. 　前記判定用データは、同位相および逆位相の前記検出用信号を前記第１および前記第２の増幅器にそれぞれ出力したときに前記第１および前記第２の増幅器の同相の出力端子同士および逆相の出力端子同士のいずれか一方または双方に流れる各電流値の大小関係が前記第１および前記第２の増幅器の出力端子に対する前記第３のスピーカの接続関係に対応付けられたデータであり、
    　前記判定部は、前記電流比較部による比較の結果に基づいて前記判定用データを参照することで、前記第３のスピーカが前記第１および前記第２の増幅器のいずれの出力端子に接続しているかを判定することを特徴とする請求項１記載のオーディオ装置。     The determination data includes in-phase output terminals of the first and second amplifiers and anti-phase signals when the detection signals having the same phase and opposite phase are output to the first and second amplifiers, respectively. The magnitude relationship of each current value flowing through one or both of the output terminals of the first and second amplifiers is data associated with the connection relationship of the third speaker with respect to the output terminals of the first and second amplifiers,
    The determination unit refers to the determination data based on a comparison result by the current comparison unit, so that the third speaker is connected to any output terminal of the first and second amplifiers. The audio apparatus according to claim 1, wherein it is determined whether or not.
PCT/JP2014/052773 2014-02-06 2014-02-06 Audio device WO2015118643A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2014/052773 WO2015118643A1 (en) 2014-02-06 2014-02-06 Audio device
JP2015561103A JP6045726B2 (en) 2014-02-06 2014-02-06 Audio equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/052773 WO2015118643A1 (en) 2014-02-06 2014-02-06 Audio device

Publications (1)

Publication Number Publication Date
WO2015118643A1 true WO2015118643A1 (en) 2015-08-13

Family

ID=53777476

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/052773 WO2015118643A1 (en) 2014-02-06 2014-02-06 Audio device

Country Status (2)

Country Link
JP (1) JP6045726B2 (en)
WO (1) WO2015118643A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766407A (en) * 2021-08-06 2021-12-07 安徽康佳电子有限公司 Audio phase detection system and method based on single chip microcomputer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0193299A (en) * 1987-10-05 1989-04-12 Fujitsu Ltd Speaker test system
JPH042209A (en) * 1990-04-19 1992-01-07 Sanyo Electric Co Ltd Load connection state detection circuit
JPH05199594A (en) * 1992-01-22 1993-08-06 Mitsubishi Electric Corp Audio device on vehicle with central speaker
JP2006279753A (en) * 2005-03-30 2006-10-12 Yamaha Corp Speaker inspection method, speaker inspection apparatus and sound reproducing apparatus
JP2013157664A (en) * 2012-01-26 2013-08-15 Toshiba Corp Power amplification device and audio system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0193299A (en) * 1987-10-05 1989-04-12 Fujitsu Ltd Speaker test system
JPH042209A (en) * 1990-04-19 1992-01-07 Sanyo Electric Co Ltd Load connection state detection circuit
JPH05199594A (en) * 1992-01-22 1993-08-06 Mitsubishi Electric Corp Audio device on vehicle with central speaker
JP2006279753A (en) * 2005-03-30 2006-10-12 Yamaha Corp Speaker inspection method, speaker inspection apparatus and sound reproducing apparatus
JP2013157664A (en) * 2012-01-26 2013-08-15 Toshiba Corp Power amplification device and audio system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766407A (en) * 2021-08-06 2021-12-07 安徽康佳电子有限公司 Audio phase detection system and method based on single chip microcomputer
CN113766407B (en) * 2021-08-06 2024-03-08 安徽康佳电子有限公司 Audio phase detection system based on singlechip

Also Published As

Publication number Publication date
JP6045726B2 (en) 2016-12-14
JPWO2015118643A1 (en) 2017-03-23

Similar Documents

Publication Publication Date Title
US8270631B2 (en) Multi-channel audio amplification apparatus
JP6362298B2 (en) Acoustic system with separate playback zones
US8175285B2 (en) Audio player apparatus having sound analyzer and its control method
US9609418B2 (en) Signal processing circuit
JP2006042195A (en) Acoustic signal processing method and device
EP3480950B1 (en) Load detector and method of detecting a load
JP2019533192A (en) Noise estimation for dynamic sound adjustment
ATE418255T1 (en) SOUND SYSTEM AND METHOD FOR SOUND REPRODUCTION
WO2010097924A1 (en) Speaker polarity judgment device
KR20060105456A (en) Audio signal amplifying apparatus and distortion correcting method
JP2011135178A (en) Acoustic device, acoustic system and sound signal control method
JP6045726B2 (en) Audio equipment
JP2016105564A (en) Speaker device
US10212531B2 (en) Audio processor
WO2013179332A1 (en) Audio device
US20120114143A1 (en) Sound output apparatus
CN111343548B (en) Audio processor
WO2018077800A1 (en) Acoustic signaling
JP2018163304A (en) Signal processing apparatus and active noise cancellation system
WO2014083809A1 (en) Anomaly detection system and anomaly detection device for speaker wiring
JP7189033B2 (en) Semiconductor device and sound output device
US10602272B2 (en) Audio signal processor
JP2014232160A (en) Active noise controller
JP2002095095A (en) Sound volume control device
JPH0847099A (en) Setting method for speaker delay time

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14881516

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2015561103

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14881516

Country of ref document: EP

Kind code of ref document: A1