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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus for transmitting voice signals of a plurality of systems to a plurality of speakers
in accordance with a set network, the connection of the speakers connected to voice signal
output means including a main unit It relates to the determination method.
[0002] A network is formed by frequency-dividing an audio signal obtained from a recording
medium, such as a tape or CD, on which music information is recorded, or another sound source,
to form a network for transmitting as plural systems of audio signals. A system configuration is
known which connects speakers suitable for a network set for each. In particular, in recent years,
on-vehicle audio devices equipped with such a network setting function are becoming
[0003] Many of such vehicle-mounted audio devices are provided with 2 WAY and 3 WAY
speakers on the front and rear sides of the passenger compartment, and some are provided with
subwoofer speakers. In such an audio device, a network setting switch is provided in the main
device, and an optimum acoustic environment can be obtained by setting a network according to
a speaker connected via a power amplifier.
[0007] However, in the above-mentioned prior art, since the audio signal transmitted from the
main unit extends to 14 systems, the work of connecting a plurality of power amplifiers and a
plurality of speakers is extremely complicated. , There was a problem that misconnection is likely
to occur.
In order to check whether the connected speaker is the desired one, it is possible to check the
front or rear, or the right or left speaker by the operation of a fader or balance, but the low
frequency, middle There was also a problem that it was not possible to check the speakers in the
high range and high range.
The present invention solves the problems of the prior art as described above, and it is an object
of the present invention to provide a method for determining the speaker connection of an audio
device, which can easily confirm the connection after the speaker is connected.
SUMMARY OF THE INVENTION In order to achieve the above-described conventional object, the
present invention provides an audio signal output means for performing signal processing on an
audio signal from a predetermined sound source, and transmitting an audio signal from the audio
signal output means. In an audio apparatus having a plurality of speakers respectively connected
to a plurality of output terminals and a network setting means for setting a network of an audio
signal sent from the output terminals, the setting state of the network setting means is
determined and determined Based on the setting state, one of the plurality of output terminals
for transmitting the audio signal is selected, and a reference audio signal is supplied to the audio
signal output means in place of the audio signal from the predetermined sound source and the
selected output A reference audio signal subjected to signal processing is sent out from the
Reference numeral 2 denotes a 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 power amplifier 3 amplifies and outputs an analog audio signal output from the DSP
unit 2. The power amplifier 3 can amplify and output audio signals of up to 14 channels as
described later. A speaker 4 receives an audio signal from the power amplifier 3 and generates a
sound. Here, the center unit 1, the DSP unit 2 and the power amplifier 3 are collectively referred
to as audio signal output means.
[0013] Therefore, according to the present invention, the connection of a plurality of speakers
connected to audio signal output means for transmitting audio signals of a plurality of systems
can be easily confirmed. FIG. 2 is a block diagram showing an internal configuration of the DSP
unit 2 in FIG. In FIG. 2, reference numeral 20 denotes an audio input unit, which selectively
selects either an audio signal output from the center unit 1 or a reference audio signal output
from the analyzer 6 according to a given selection signal. Output. Reference numeral 21 denotes
a parametric equalizer adjustment unit (hereinafter referred to as "P-EQ"), which emphasizes a
specific frequency band according to given parameter data and corrects the frequency
characteristics of the input audio signal.
[0015] Embodiments of the present invention will be described in detail with reference to the
drawings. Reference numerals 26 to 29 denote D / A conversion units, which convert digital
audio signals for each band sent from the network adjustment unit 22 into analog audio signals.
The D / A converter 26 is for a subwoofer, and converts and outputs ultra low-pass audio signals
of L channel and R channel. The D / A conversion unit 27 is for a woofer, and converts and
outputs a total of four low-channel audio signals of L channel and R channel for front and rear.
Similarly, the D / A conversion units 28 and 29 respectively convert the mid-range and highrange audio signals of the L channel and the R channel for the front and rear channels and
output the converted signals. Therefore, the D / A converters 26 to 29 convert the total of 14
channels of digital audio signals into analog audio signals, and send the analog audio signals
from the plurality of output terminals 26T to 29T to the corresponding plurality of speakers 4.
[0010] FIG. 1 is a block diagram showing the configuration of an automatic adjustment system
for an audio device according to the present invention. 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. 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. This analyzer 6 can also
transmit so-called pink noise signals including the entire frequency band of the audio signal
processed by the center unit 1 and the DSP unit 2, signals of specific frequencies in the range of
that frequency band such as so-called monotone, etc. By setting, any audio signal in the audio
frequency band can be transmitted. A microphone 8 receives an audio signal obtained by
collecting the sound generated from the speaker 4 into the analyzer 6. Reference numeral 30
denotes a network setting unit to be described later. Reference numeral 1 a denotes a remote
control for remotely operating the center unit 1.
[0014] Reference numeral 22 denotes a network adjustment unit, which divides the audio signal
sent from the P-EQ 21 into a plurality of frequency bands and outputs them, and adjusts the
transmission time until reaching each speaker so-called time alignment correction. Also do. A
communication unit 23 processes control signals transmitted to and from the personal computer
7. In this embodiment, the communication unit 23 comprises an RS232C interface. A
microcomputer 24 controls the operation of the DSP unit 2. A backup memory 25 is a storage
means for storing parameter data for sound correction by the P-EQ 21 and is constituted by an
E2 PROM or the like.
[0016] Reference numeral 30 is a switch as a network setting means for setting the network of
the audio signal sent from the network adjustment unit 22, 31 is a switch for the front, 32 is a
switch for the rear, and 33 is a switch for the subwoofer It is. For example, the front and rear
switches 31 and 32 can be set to four states of 1 WAY, 2 types of 2 WAY, and 3 WAY, and the
network data is uniquely determined by this setting state. The switch 33 for the subwoofer can
be set to three states: stereo, monaural, and off. Therefore, in the case of this embodiment, a
system can be configured by connecting up to 14 speakers.
[0017] Next, the method of determining the speaker connection according to the configuration
shown in FIGS. 1 and 2 will be described.
[0018] FIG. 3 is a flow chart showing the operation of the speaker connection judging method in
the present embodiment. In FIG. 3, the audio analyzer 5 is connected to the DSP unit 2 (step S1).
When the test mode for determining the speaker connection is set by key input of the personal
computer 7, network data of the network setting switch 30 of the DSP unit 2 is read (step S2).
The read network data is analyzed (step S3), and the network data is displayed on the screen of
the personal computer 7 (step S4).
[0019] Next, a speaker to be checked for sound output connection is selected (step S5). This
selection can be made, for example, by operating the cursor on the personal computer 7, or
automatically and cyclically. After the selection, a test tone which is pink noise is output to the
DSP unit 2 (step S6). The user can confirm the connection by listening to the ringing of the
speaker by the test tone. When the connection confirmation of one speaker is completed, it is
determined whether or not it is an end operation of the connection confirmation (step S7). If it is
not the end operation, the process moves to step S5 according to the operation or automatically.
Select the speaker of, and check the speaker connection sequentially.
[0020] If the low frequency woofer speaker and the high frequency tweeter speaker are
misconnected, high sound may be generated although the low frequency sound should normally
be generated when the woofer speaker is selected. By being generated, it can be determined that
the connection is incorrect.
[0021] If a test tone of monotone is sent instead of pink noise, no sound can be output from the
misconnected speaker. For example, when a woofer speaker is selected, when a 25 Hz monotone
is output, no sound is generated from the tweeter speaker, and the sound generated from the
mid-range speaker is also very small. Therefore, the user can easily determine whether or not the
connection is incorrect only by the presence or absence of the generated sound.
[0029] As is apparent from the above embodiments, according to the present invention, the
setting state of the network setting means is determined, the speakers are selected in order
according to the determination result, and the predetermined reference audio signal is
transmitted. Thus, it is possible to easily check whether the connection is correct or not for a
plurality of speakers connected to audio signal output means for transmitting audio signals of a
plurality of systems.
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