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JP2004297541

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DESCRIPTION JP2004297541
An object of the present invention is to provide an acoustic device capable of output
corresponding to various channel numbers. The audio device 1 reproduces and outputs an audio
signal from an audio source, and an audio signal and a reference voltage source V that outputs a
predetermined voltage to an input of an amplifier block Amp2 that amplifies the audio signal. A
switch SW is provided to connect any of the output voltages of the amplifier block and the
amplifier block Amp2 to be usable as a regulator. [Selected figure] Figure 1
Acoustic device and amplifier IC
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus and the like, and more particularly to an audio apparatus and the like provided
with an amplifier capable of multi-output. Conventionally, in an audio apparatus for outputting
sound in an audio apparatus, a video apparatus or the like, power amplifiers for four channels
are integrated into a single chip together with a preamplifier. Thereby, in the audio apparatus,
audio signals obtained from various sources are input to the integrated circuit of such chips, and
the audio signals are distributed to each power amplifier circuit through the preamplifier, and the
speaker is driven by the power amplifier circuit. Is configured as. Furthermore, in recent years,
with regard to this type of acoustic device, along with the increase in power and integration, the
power supply circuit of the entire acoustic device for supplying power to each part has been
developed into an integrated circuit together with a power amplifier circuit and a preamplifier.
There is. Here, as a prior art, there is a technology in which a preamplifier and a power amplifier
circuit are integrated with a power supply circuit (see, for example, Patent Document 1). [Patent
Document 1] Japanese Patent Application Laid-Open No. 2002-247680 (page 3-4, FIG. 1) [0005]
By the way, four channels are currently mounted as in-vehicle acoustic devices. Although the
mainstream is the multi-speaker in recent years, the demand for four to five channels and six
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channels has tended to increase in general audio devices including vehicle-mounted ones. In
addition, audio amplifiers equipped with regulators are also in widespread use. However, when
multi-output is advanced in an integrated circuit (amplifier IC) in which an amplifier
incorporating a regulator is integrated on one chip, the lineup of ICs according to the number of
outputs such as for 5 channels and 6 channels It will be necessary to align the Thus, as the
lineup of ICs increases, the unit price per product type increases, and it becomes necessary to
adjust the balance between supply and demand as the number of types of ICs increases and the
production management becomes complicated. Become. In the technique described in the abovementioned Patent Document 1, the amplifier IC includes a preamplifier and a power amplifier for
four channels, and further, a power amplifier power supply circuit as a power supply circuit and
a drive circuit for an audio signal processing circuit. Although a power supply circuit, a
mechanism drive power supply circuit, and a microcomputer power supply circuit are mounted,
for example, in the case of using for 5 channels and 6 channels, it is necessary to design an
amplifier IC corresponding to each.
Therefore, the present invention has been made on the basis of such technical problems, and the
object of the present invention is to provide an audio device capable of output corresponding to
various channel numbers corresponding to multi-output operation. To provide. SUMMARY OF
THE INVENTION With the object of the present invention, an acoustic device according to the
present invention is an acoustic device for reproducing and outputting an audio signal from an
acoustic source, and an amplifier circuit for amplifying the audio signal. An audio signal and an
output voltage from a reference voltage source that outputs a predetermined voltage are
connected to the input of the circuit. Further, it is possible to connect either the audio signal or
the output voltage from the reference voltage source to the input of the amplifier circuit by the
connection switching signal from the control means for controlling the entire operation.
Furthermore, the reference voltage source can output a plurality of reference voltages, and the
output voltage can be changed by a voltage switching signal from control means for controlling
the overall operation. Further, the audio device of the present invention includes a plurality of
amplifier circuits for amplifying an audio signal from an audio source to drive a plurality of
speakers, and a reference voltage source for outputting a predetermined voltage, and the
plurality of amplifiers An output voltage from a reference voltage source is input to at least one
amplifier circuit of the circuit. Here, at least one of the plurality of amplifier circuits includes two
BTL-connected amplifiers, and at least one of the two amplifiers is characterized in that the
output voltage from the reference voltage source is input. It can be done. Further, the present
invention is regarded as an amplifier IC, and a reference voltage for outputting an audio signal
and a predetermined voltage to inputs of a plurality of amplifier circuits for amplifying an audio
signal from an acoustic source and driving a plurality of speakers. It is characterized in that
either of the output voltage from the source is connected. Furthermore, the input of at least one
of the plurality of amplifier circuits may be connected to a reference voltage source. The
reference voltage source can also be characterized in that it can output a plurality of reference
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voltages. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described
in detail below based on the embodiments shown in the attached drawings. What is shown in FIG.
1 is a diagram for explaining an acoustic device in the present embodiment. The audio device 1
includes an amplifier IC (Integrated Circuit) 10 capable of outputting five channels, and five
speakers SP 1, SP 2, SP 3, SP 4, SP 5 which output signals amplified by the amplifier IC 10 as
sound, and television broadcasting. And a tuner unit 20 that receives and reproduces and outputs
radio waves such as radio broadcasts, and an audio unit that reproduces and outputs various
data such as audio data from a recording medium such as a CD (Compact Disk) or MD (Mini Disk)
30, a display unit 40 for displaying a television broadcast and displaying the operation status of
a CD player or the like, a mechanism driving unit 50 for driving a driving unit such as a CD
player or an MD player, and microcomputer control for controlling the operation of the audio
device 1 Unit 60, the power supply 70 for supplying power to the amplifier IC 10 That.
For example, when the speakers SP1, SP2, SP3, SP4 and SP5 are mounted on a car, the speaker
SP1 is at the front right side (FR), the speaker SP2 is at the front left side (FL), and the speaker
SP3 is at the rear right side (RR), the speaker SP4 is disposed at the rear left (RL), and the
speaker SP5 is disposed at the front center (FC). As described above, by providing a so-called
center speaker SP5 at the center of the front in addition to the conventional four channels, a
more realistic sound can be reproduced. The tuner unit 20 is configured of a radio receiver that
receives radio broadcasting such as AM broadcasting and FM broadcasting from the antenna 21
or a television receiver that receives VHF broadcasting, UHF broadcasting, and BS broadcasting.
A signal received by the radio receiver or the television receiver is processed by the signal
processing circuit, an audio signal (audio signal) is transmitted to the amplifier IC 10, and a video
signal is transmitted to the display unit 40. The audio unit 30 is a CD player, an MD player, an
audio reproduction device such as a cassette tape deck, a video reproduction device such as a
DVD (Digital Versatile Disk) player, a hard disk, a CD-ROM (CD-Read). A recording medium drive
device or the like for reading data from a recording medium such as Only Memory) is configured.
Signals output from the audio reproduction device, the video reproduction device, the recording
medium drive device, etc. are processed by the signal processing circuit, the audio signal is
transmitted to the amplifier IC 10, and the video signal is transmitted to the display unit 40. The
display unit 40 is configured of a liquid crystal display device or the like, and displays an image
from the television receiver of the tuner unit 20 or is output from a video reproduction device of
the audio unit 30 or a recording medium drive device or the like. It displays the video
information, displays the current operation target such as the tuner unit 20 or the audio unit 30,
and displays the current control amount of the operation target. Furthermore, for example, the
acoustic device 1 can be used as a part of a car navigation device, and in this case, an
intersection enlarged view screen based on map data and guidance data processed by the
microcomputer control unit 60, a branch point An enlarged view screen, a current route being
traveled, a route newly searched, information on a destination on each route, a destination name,
a time, a distance, an advancing direction arrow, and the like are displayed. In addition, for
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example, in the case of a vehicle, the display unit 40 is installed on an instrument panel in the
vicinity of the driver's seat, and the driver looks at this to display the operation target or the
current control amount of the operation target. And other information can be grasped.
Furthermore, an operation input configured to use a tablet including a touch panel, a touch
screen, and the like on the display screen of the display unit 40 and perform various inputs such
as changing the operation target or changing the control amount of the operation target by
touching the screen. You may share a part. The mechanism drive unit 50 is a CD player or an MD
player of the audio unit 30, and further, a spindle motor and a servo mechanism of an optical
pickup in a DVD player, a recording medium drive device, etc., a loading mechanism, and a tape
running in a cassette tape deck It is comprised by drive circuits, such as a loading mechanism.
The microcomputer control unit 60 is a controller that controls the overall operation of the audio
device 1 and has a function of storing the states of various audio sources and video sources and
controlling the overall operation. That is, the microcomputer control unit 60 controls, for
example, the synthesizer of the front end of the tuner unit 20 so that the channel desired by the
user can be received. It also acquires and holds data such as TOC (Table Of Contents) such as CD,
MD, DVD, etc., and controls the mechanism drive unit 50 according to the data of this TOC,
thereby the user's desired audio signal or video signal Make it possible to play Next, the amplifier
IC 10 will be described. The amplifier IC 10 can receive audio signals output from the tuner unit
20 and the audio unit 30, amplify the signals, and drive five speakers SP1, SP2, SP3, SP4, and
SP5. FIG. 2 is a block diagram for explaining the structure of the amplifier IC 10. As shown in
FIG. In the amplifier IC 10, amplifier circuits CH1, CH2, CH3, CH4, CH5 for driving the five
speakers SP1 to SP5, an amplifier power supply circuit 10A for generating a driving power
supply for the amplifier circuits CH1 to CH5, and the tuner unit 20. Tuner power supply circuit
10B that generates drive power supply, audio power supply circuit 10C that generates drive
power supply for audio unit 30, microcomputer control unit power supply circuit 10D that
generates drive power supply for microcomputer control unit 60, mechanism drive unit A
mechanism drive power supply circuit 10E that generates 50 drive power supplies is integrated
and mounted. For example, 14.4 V is supplied from the power supply 70 to the amplifier power
supply circuit 10A, the tuner power supply circuit 10B, the audio power supply circuit 10C, the
microcomputer control unit power supply circuit 10D, and the mechanism drive unit power
supply circuit 10E. The voltage is reduced to the required voltage in each of the power supply
circuits 10A to 10E.
A power supply line is connected to each of the amplifier circuits CH1 to CH5 from the amplifier
power supply circuit 10A, and the DC voltage from the power supply 70 is supplied as it is.
Similarly, a power supply line is connected to the tuner unit 20 from the tuner power supply
circuit 10B, and a DC voltage of, for example, 9 V is supplied. Further, a power supply line is
connected to the audio unit 30 from the audio power supply circuit 10C, and a DC voltage, for
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example, 9 V is supplied. A power supply line is connected to the microcomputer control unit 60
from the microcomputer control unit power supply circuit 10D, and a DC voltage such as 5 V is
supplied. A power supply line is connected to the mechanism driving unit 50 from the
mechanism driving unit power supply circuit 10E, and a DC voltage, for example, 6 V is supplied.
On the other hand, audio signals output from the tuner unit 20 and the audio unit 30 are input to
the amplifier circuits CH1 to CH5, respectively. FIG. 3 is a basic diagram for explaining the
configuration of the amplifier circuits CH1 to CH4 excluding the amplifier circuit CH5 among the
amplifier circuits CH1 to CH5, and shows the configuration of the amplifier circuit CH1 as an
example. As shown in FIG. 3, the amplifier circuits CH1 to CH4 are mainly configured by three
amplifier blocks Amp1, Amp2, and Amp3. First, the amplifier block Amp1 is used to amplify the
signal voltage of the input audio signal, and a gain of 20 dB is generally obtained when the
amplifier block Amp1 is used as an example. Then, a signal whose phase is inverted is output to
the amplifier block Amp2 and the amplifier block Amp3. The amplifier block Amp2 and the
amplifier block Amp3 adopt a BTL (Bridged Transless) structure in which the two reverse phase
outputs from the amplifier block Amp1 are bridge-connected. By configuring in this way, the
output voltage is theoretically doubled, so that fourfold output power can be obtained, and a
powerful power amplifier can be configured. Therefore, the total gain finally becomes 26 dB. The
amplifier block Amp2 and the amplifier block Amp3 function as an output stage amplifier having
a buffer function of outputting an audio signal differentially output from the amplifier block
Amp1 at a low output impedance. The resistors R2 and R3 which constitute a negative feedback
amplifier circuit are respectively connected to the amplifier block Amp2 and the amplifier block
Amp3.
Next, the configuration of the amplifier circuit CH5 will be described. FIG. 4 is a diagram for
explaining the configuration of the amplifier circuit CH5. As shown in FIG. 4, in the amplifier
circuit CH5, connection between the amplifier blocks Amp1 and Amp2 is established between the
three amplifier blocks Amp1, Amp2, and Amp3, the variable reference voltage source V, and the
amplifier blocks Amp1 and Amp2. And a switch SW for selecting one of the connection between
the amplifier block Amp2 and the reference voltage source V. In the amplifier circuit CH5, an
audio signal amplified by the amplifier block Amp1 constitutes a single end push pull amp (SEPP
Amp) that is output only to the amplifier block Amp3. The center speaker SP5 driven by the
amplifier circuit CH5 is disposed at the front center (FC) in the arrangement configuration of the
speakers, and for example, the voice of a person can be heard exclusively from the front of the
console panel on which the acoustic device 1 is disposed. Since the speaker mainly produces the
following effects, it does not require a large output. For this reason, it is possible to obtain
sufficient output in the SEPP Amp configuration. In the amplifier circuit CH5, the switch SW
connects the amplifier block Amp2 and the reference voltage source V by a bus signal from the
microcomputer control unit 60 (see FIG. 1). That is, since an amplifier for driving the speaker
SP5 is sufficient for SEPP Amp consisting only of the amplifier block Amp3, the variable
reference voltage source V is connected to the input terminal of the amplifier block Amp2 not
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used as an amplifier for driving the speaker SP5. The amplifier block Amp2 is configured to be
used as a regulator. The connection between the amplifier block Amp2 and the reference voltage
source V can be set not only to switch the switch SW by the bus signal, but also to directly
connect the terminals in the amplifier IC 10. Since the amplifier block Amp2 has a buffer
function of high input impedance and low output impedance, the output when the load on the
output side is changed by connecting the reference voltage source V to the input terminal of the
amplifier block Amp2 It is possible to minimize voltage fluctuation and to function as a regulator
that supplies a stable voltage by minimizing output voltage fluctuation even if the input voltage
fluctuates.
For this reason, the output from the amplifier block Amp2 in which the reference voltage source
V is connected to the input terminal is connected to the display unit 40 and can be used as a
power supply of the display unit 40. Can be used effectively. Here, the reference voltage source V
will be described. For example, as shown in FIG. 5, the reference voltage source V is configured
such that Zener diodes D1, D2, D3 and D4 are connected in series, and voltages are applied to
the respective Zener diodes D1 to D4 in the reverse direction. ing. That is, the cathode terminal of
the Zener diode D1 is connected to the amplifier power supply circuit 10A via the resistor Rv,
and the gate terminal of the Zener diode D1 is connected to the cathode terminal of the next
stage Zener diode D2. Hereinafter, the gate terminals of the Zener diodes D2 and D3 are
respectively connected to the cathode terminals of the Zener diodes D3 and D4 in the next stage,
and the gate terminal of the Zener diode D4 is grounded. Further, output terminals P1, P2, P3
and P4 are disposed on the cathode terminal side of each of the Zener diodes D1 to D4. Then,
one of the output terminals P1 to P4 is selected by the bus signal from the microcomputer
control unit 60, and a desired reference voltage can be obtained. That is, as shown in FIG. 6, the
microcomputer control unit 60 outputs a 5-digit bus signal from the most significant bit MSB
(Most Significant Bit) to the least significant bit LSB (Least Significant Bit). 9 V for the unit 30, 9
V for the tuner unit 20, 6 V for the mechanism drive unit 50, 6 V for the display unit 40, and 5 V
for the microcomputer control unit 60 can be selected. . In the embodiment shown in FIG. 5, in
the reference voltage source V, the output terminal P3 is selected by the bus signal, and 6 V for
the display unit 40 is output from the output terminal Vout. The amplifier block Amp2 functions
as a regulator with respect to the output from the output terminal Vout, and the output from the
amplifier block Amp2 can be used as a 6 V power supply for the display unit 40. The voltage
output from the output terminal Vout may be appropriately selected by the bus signal, and may
be used as a power supply for the tuner unit 20, the audio unit 30, the mechanism driving unit
50, and the microcomputer control unit 60. is there.
Next, the case where the acoustic device 1 of the present embodiment is applied to four-channel
output will be described. FIG. 7 is a diagram for explaining the configuration of the amplifier
circuit CH5 when the acoustic device 1 is applied to four-channel output. As shown in FIG. 7, the
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amplifier circuit CH5 includes an amplifier between three amplifier blocks Amp1, Amp2, and
Amp3, a variable reference voltage source V1, a variable reference voltage source V2, and
amplifier blocks Amp1 and Amp2. A switch SW1 for selecting one of the connection between the
blocks Amp1 and Amp2 and the connection between the amplifier block Amp2 and the reference
voltage source V1, and the connection between the amplifier blocks Amp1 and Amp3 between
the amplifier blocks Amp1 and Amp3 And a switch SW2 for selecting one of the connection
between the amplifier block Amp3 and the reference voltage source V2. When the acoustic
device 1 is applied to a 4-channel output, two outputs of the amplifier circuit CH5 can be used
for power supply. Therefore, the switch SW1 is set to connect the amplifier block Amp2 and the
reference voltage source V1 by the bus signal from the microcomputer control unit 60, and the
variable reference voltage source V1 is connected to the input terminal of the amplifier block
Amp2. The amplifier block Amp2 is used as a regulator. Further, the switch SW2 is set to connect
the amplifier block Amp3 and the reference voltage source V2 by the bus signal from the
microcomputer control unit 60, and the variable reference voltage source V2 is connected to the
input terminal of the amplifier block Amp3. The amplifier block Amp3 is used as a regulator.
Then, the output voltage of the reference voltage source V 1 is set to 6 V for the display unit 40
by the bus signal from the microcomputer control unit 60, and the output of the amplifier block
Amp 2 is used as a power supply for the display unit 40. Furthermore, the output voltage of the
reference voltage source V2 can be set to 9 V for the tuner unit 20 by a bus signal, and the
output of the amplifier block Amp3 can be used as a power supply of the tuner unit 20. As
described above, even when the amplifier IC 10 designed for five channels is applied to four
channels, the amplifier output not used as an amplifier can be effectively used. Therefore, four
amplifier ICs 10 designed for five channels are used. It can be used without waste even if it is
used for channels. In particular, since the amplifier output is designed to be relatively large
compared to the power consumption of other electric circuits, it can be easily diverted to a
regulator, so that unused amplifier output can be effectively used.
When the amplifier circuit CH5 having such a configuration is used for five channels, the switch
SW2 is set to connect the amplifier block Amp3 to the amplifier block Amp1 by a bus signal from
the microcomputer control unit 60. It is possible to connect the output of the amplifier block
Amp3 to the speaker SP5. Further, at this time, when configured to obtain a large output from
the speaker SP5, the switch SW1 is further set to connect the amplifier block Amp2 to the
amplifier block Amp1 by a bus signal from the microcomputer control unit 60. It is also possible
to connect the output of the amplifier block Amp2 to the speaker SP5. Next, the operation of the
audio device 1 of the present embodiment will be described. In the audio apparatus 1, when a
user loads a CD, MD, DVD, or the like into the audio unit 30, the loading of these is detected by
the mechanism driving unit 50 and notified to the microcomputer control unit 60. Under the
control of the unit 50 and the audio unit 30, the CD or the like is loaded and the TOC data is
reproduced. Further, by the control of the mechanism drive unit 50 and the audio unit 30 by the
microcomputer control unit 60 according to the data of this TOC, the audio signal and the video
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signal from the CD etc. are reproduced. Input to CH1 to CH5. When the user loads a cassette tape
into the audio unit 30, similarly, the loading of the cassette tape is detected by the mechanism
driving unit 50 and notified to the microcomputer control unit 60, and the mechanism driving by
the microcomputer control unit 60 is performed. Under control of the unit 50 and the audio unit
30, the cassette tape is loaded and reproduced, and the resulting audio signal is input to the
amplifier circuits CH1 to CH5 of the amplifier IC 10. In addition, when the user instructs to view
radio broadcast or television broadcast, this instruction is detected by the microcomputer control
unit 60, and the microcomputer control unit 60 controls the tuner unit 20 to receive and obtain a
desired channel. Among the audio signal and the video signal, the audio signal is input to the
amplifier circuits CH1 to CH5 of the amplifier IC10. The audio signals obtained from the various
sources in this manner are distributed to the amplifier circuits CH1 to CH5 of the amplifier IC 10,
amplified by the respective amplifier circuits CH1 to CH5, and the speakers SP1 to SP5 are
driven.
Thus, the sound device 1 can listen to the sound desired by the user. As described above, in the
audio device 1 according to the present embodiment, as described above, the amplifier circuits
CH1 to CH5 that process audio signals are integrated with various power supply circuits 10A to
10E, thereby reducing the number of components. As a result, the overall configuration can be
simplified. Furthermore, radiation of heat generated from the power supply circuits 10A to 10E
can be effectively performed. In particular, according to the present embodiment, by using an
amplifier capable of outputting a large current and a large power as it is as a regulator, it
becomes possible to use an unused amplifier output as a power supply. For this reason, although
the design (line-up) of the amplifier IC matched to the number of outputs is required for the
increase in the number of output systems due to multiple outputs, according to the present
embodiment, for example, one amplifier IC for five channels is used. Design, use the amplifier
output as a signal amplifier for the required number of speakers, and use the remaining amplifier
output as a regulator, so that all amplifier outputs can be used effectively, so one design can be
used without waste It becomes possible to correspond to all the multi outputs. Although the
present embodiment has been described for five channels, the present invention can also be
applied to six or more multi-outputs. As described above, according to the present invention, it is
possible to provide an acoustic device capable of output corresponding to various channel
numbers. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an acoustic
device of the present invention. FIG. 2 is a block diagram illustrating the structure of an amplifier
IC. FIG. 3 is a basic diagram illustrating the configuration of amplifier circuits CH1 to CH4. FIG. 4
is a diagram for describing a configuration of an amplifier circuit CH5. FIG. 5 is a diagram for
explaining the configuration of a reference voltage source. FIG. 6 is a diagram for explaining a
bus signal from a microcomputer control unit. FIG. 7 is a diagram for explaining another
configuration of the amplifier circuit CH5. Explanation of mark 10: Amplifier IC, 10A: Power
supply circuit for amplifier, 10B: Power supply circuit for tuner, 10C: Power supply circuit for
audio, 10D: Power supply circuit for microcomputer control unit, 10E: Power supply circuit for
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mechanism drive unit, 20 ... Tuner unit 30 ... Audio unit 40 ... Display unit 50 ... Mechanism drive
unit 60 60 ... Microcomputer control unit 70 ... Power supply SP1, SP2, SP3, SP4, SP5 ... Speaker,
CH1, CH2, CH3, CH4, CH5: Amplifier circuit, Amp1, Amp2, Amp3: Amplifier block, SW, SW1,
SW2: Switch, V, V1, V2: Reference voltage source
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