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JPH06311578

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DESCRIPTION JPH06311578
[0002]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of determining the speaker polarity in an audio apparatus for supplying an audio signal
carrying information such as music obtained from a predetermined sound source to a speaker.
[0004]
2. Description of the Related Art Audio signals obtained from recording media such as tapes and
compact discs (CDs) on which music pieces are recorded, and other sound sources are subjected
to predetermined signal processing by amplification and other processing, to speakers with
designated polarities. Audio devices to supply are widely known. In such an apparatus, when
connecting an amplifier and a speaker, it is necessary to correctly connect + (positive electrode)
and-(negative electrode) with a designated polarity. If this polarity is incorrect at the time of
connection, the phase of the output sound from the speaker will be reversed and the sound
quality will be significantly reduced. Therefore, in the instruction manual or the like, care has
been taken to carefully connect the amplifier and the speaker. [0004] Moreover, such a
confirmation operation may be difficult to easily find depending on the type of sound from the
speaker and the musical sensitivity of the listener. Furthermore, in the case of an on-vehicle
audio device, the connection itself between the amplifier and the speaker is complicated, and
even if an error in connection is found, there is a problem that it takes time to correct the
connection.
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[0006]
However, in the above-mentioned conventional audio apparatus, when connecting the amplifier
and the speaker, there is a risk of damaging the apparatus unless the power of the audio
apparatus is turned off. There is a problem that when there are many speakers, the confirmation
is difficult because the connection from the speakers is heard to confirm the correctness of the
connection. The present invention solves such conventional problems and is an excellent audio
apparatus capable of easily detecting a connection error between an amplifier and a speaker and
arbitrarily setting the polarity of an audio signal supplied to the speaker. It is an object of the
present invention to provide a speaker polarity determination method in
[0005] Furthermore, some users may consciously connect to the reverse polarity according to
the genre of music and enjoy the abnormal musicality, but it is complicated to change the
connection each time. It was extremely difficult in practice.
[0011] SUMMARY OF THE INVENTION In order to achieve the above-mentioned conventional
object, an audio apparatus for applying predetermined signal processing to an audio signal from
a main unit and supplying the speaker with designated polarity from the main unit A reference
audio signal is supplied in place of the audio signal, and the correctness of the polarity of the
speaker audio signal obtained by collecting the sound generated from the speaker by the
microphone according to the reference audio signal is determined, The polarity of the audio
signal supplied to the speaker is arbitrarily set according to the operation. Reference numeral 2
denotes a DSP unit (DSP unit) as sound correction means, which applies sound correction to the
sound signal outputted from the center unit 1 to create a sound field rich in presence. A main
amplifier 3 amplifies and outputs an analog audio signal output from the DSP unit 2. A speaker 4
receives an audio signal from the main amplifier 3 and generates a sound.
[0013] Therefore, according to the method of determining the speaker polarity in the audio
apparatus of the present invention, the reference audio signal is supplied to the speaker after
connection of the speaker is completed, and the polarity of the sound from the speaker is
automatically determined. Even if there are many cases, the correctness of the connection can be
easily made, and the polarity of the audio signal supplied to the speaker can be freely set.
Therefore, even for the user who consciously connects in the reverse polarity and enjoys the
abnormal musicality The complexity of connection change can be eliminated. A reference audio
signal can be supplied to the DSP unit 2 from the audio analyzer 5 instead of the audio signal
from the center unit 1. A pulse signal is used as the reference voice signal in the present
embodiment. FIG. 2 shows a pulse signal output from the audio analyzer 5 (this is called an
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“input pulse signal”) and an audio signal obtained by collecting the sound generated from the
speaker 4 according to this pulse signal by the microphone 8 (“output this (Referred to as
“pulse signal”).
[0015] Embodiments of the present invention will be described in detail with reference to the
drawings. FIG. 3 is a flow chart of the speaker polarity determination. The method of determining
the speaker polarity and the method of setting the polarity will be described with reference to
FIG.
[0010] FIG. 1 is a block diagram showing the configuration of a system to which the method of
determining the speaker polarity in the audio apparatus of the present invention is applied. In
FIG. 1, among the connection lines connecting the blocks, those shown by solid lines are signal
lines for transmitting audio signals, and those shown by dotted lines are control lines for
transmitting control signals. The audio apparatus of this embodiment is an on-vehicle audio
apparatus mounted on a vehicle. Reference numeral 1 denotes a center unit as a main unit, which
receives instructions from the operation unit and receives master commands loaded therein to
control each unit as a sound source such as a tuner unit, a tape deck, a CD deck, or a CD
autochanger. The slave microcomputers are intensively controlled via a computer line, and the
audio signal of the source corresponding to the operation is selected and output.
[0012] An audio analyzer 5 comprises an analyzer 6 and a personal computer 7. A control line
between the personal computer 7 and the DSP unit 2 is constituted by RS232C, and a signal line
from the analyzer 6 to the DSP unit 2 is constituted by an optical cable. A microphone 8 receives
an audio signal obtained by collecting the sound generated from the speaker 4 into the analyzer
6. Reference numeral 1 a denotes a remote control for remotely operating the center unit 1.
[0014] In FIG. 2, when the connection between the amplifier 3 and the speaker 4 has the correct
polarity, the phases of the input pulse signal and the output pulse signal are positive, and when
the connection is reverse polarity, the input pulse signal. And the output pulse signal have
opposite phases. Since this phase relationship is displayed on the display unit of the personal
computer 7, the user can easily recognize the correctness of the connection polarity. Further, by
reversing the polarity of the audio signal supplied to the speaker 4 by key operation of the
personal computer 7, the polarity of the audio signal supplied to the speaker can be freely set
without actually changing the connection.
[0016] First, after an audio analyzer is connected to the DSP unit (step S1), a speaker is selected
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on the audio analyzer side (step S2). When a pulse signal which is a reference voice signal is
output from the audio analyzer (step S3), the pulse signal passes through the DSP unit, and a
sound corresponding to the pulse signal is output from the selected speaker (step S4). The sound
by the pulse signal is collected by the microphone and input to the audio analyzer (step S5).
[0017] The audio analyzer displays the input pulse signal (step S6) and analyzes the pulse signal
(step S7). That is, the phases of the input pulse signal and the output pulse signal are analyzed.
As a result of this analysis, it is determined whether or not the phase is normal (step S8). If it is in
the positive phase, it is displayed that the speaker polarity is in the positive phase (step S9). In
this case, in addition to the indication that the connection is normal, a message of "OK" may be
sent out by a single beep or text-to-speech.
[0018] On the other hand, if the result of the determination is that the phase is not positive, it is
displayed that the speaker polarity is in reverse phase (step S10). Furthermore, in this case, an
error message telling that the connection is opposite is displayed (step S11). Also in this case, in
addition to the error display, a warning message of "error" may be sent out by periodic beep
sound or voice synthesis.
[0019] Thereafter, it is judged whether or not the polarity inversion operation is performed by a
predetermined key operation of the personal computer (step S12), and when the polarity
inversion operation is performed, control to invert the polarity of the audio signal supplied to the
speaker A signal is sent to the DSP unit (step S13). Thereafter, it is determined whether or not
the end operation is performed (step S14). If the end operation is not performed, the process
proceeds to step S2, and the routine for determining the polarity of the next selected speaker is
executed.
[0020] In this manner, the correctness of the connection polarity is determined by sequentially
determining the polarity of all the speakers, and the polarity of the audio signal input for each
speaker is arbitrarily set by a predetermined key operation. In fact, connection errors can be
corrected without actually changing the connection.
[0021] Although the on-vehicle audio apparatus has been described in the above embodiment, it
is needless to say that the present invention can be applied to a general household audio
apparatus. After a condenser microphone or the like is built in such a home audio apparatus and
a speaker is connected, it is determined that the connection is correct or not in the test mode in
the same manner as in the above embodiment. Then, when the connection is incorrect, a system
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for issuing a warning by display, voice or the like is configured.
[0022] According to such a configuration, even if the user who is unfamiliar with the audio
technology can correctly perform the polarity of the speaker connection.
[0030] As is apparent from the above embodiments, according to the method of determining the
speaker polarity in the audio apparatus of the present invention, the speaker audio signal and the
reference audio generated from the speaker according to the reference audio signal supplied to
the speaker Correcting the polarity of the speaker audio signal by comparing it with the signal,
determining the polarity of the audio signal supplied to the speaker according to the
predetermined operation, even if there are many connected speakers As the polarity of the audio
signal supplied to the speaker can be freely set, it is possible to virtually correct the connection
error without actually changing the connection. Furthermore, there is an effect that it is possible
to eliminate the complexity of the connection change even for the user who consciously connects
to the reverse polarity and enjoys abnormal musicality.
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