JPH09128886A - Audio input changeover device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the handling time for input system selecting operation by discriminating an input signal of the top priority from RF, optical, coaxial, and analog signals of multiple input systems and outputting it in a prescribed form. SOLUTION: When a user performs a selection operation of a LD player by an operation means 20, a controller 55 firstly controls each of the mute circuits 621 -626 to mute a musical output and turn off a switch DSW9 of a changeover circuit 54 and turn on DSW10 to change over the circuits to a digital system. The controller also stops a three-second timer. A selection control of LD source is performed through a switch. A controller 20 controls DIR 53 to change over an incorporated selector to a position IN3, detecting the presence or absence of an input error in DIR 53, and checking whether or not an error is generated in a modulator 52. If no error is generated, management information is inputted and an operation mode is set. DSP 60 expands a compressed audio sample and outputs it to D/A converters 611 -613 , and a sound field based on the AC-3 can be enjoyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio input switching device, and more particularly, it is provided in an AV amplifier, an audio amplifier, etc., and has two or more of RF input, optical input, coaxial input and analog input methods. The present invention relates to an audio input switching device that has an input system and can simultaneously input two or more systems from the same audio source, and outputs one system system selected under a predetermined condition in a predetermined signal format.

[0002]

2. Description of the Related Art AV amplifiers, audio amplifiers, etc.
Generally, analog cassette decks, CD players, MDs
A large number of various audio sources such as a player, a satellite television broadcast receiving tuner, and an LD player can be connected. Then, when the user selects a desired audio source, the signal input from the desired audio source is selected and converted into, for example, a predetermined digital audio signal format that can be processed by a DSP (digital signal processor) for sound field control. And is input to the DSP. The digital audio signal subjected to the sound field processing by the DSP is DA-converted for each channel such as front L, front R, rear L and rear R, and is input to the power amplification circuit via the volume adjusting circuit.

By the way, CD players, MD players,
The satellite television broadcast receiving tuner and the LD player can output the audio signal not only in the analog system but also in the digital system using the coaxial cable with less disturbance, and in recent years, the digital output via the optical cable with less disturbance is also possible. There is. In accordance with such diversification of output methods of audio source devices, AV amplifiers and the like can simultaneously connect a plurality of audio source devices, and some digital audio source devices can be converted from one audio source source device to an analog device. It is possible to connect two or more input systems among input, coaxial input, and optical input simultaneously. Therefore, the user can listen to the desired source with the best sound quality by performing the source selection operation with the AV amplifier and the input system selection operation.

[0004]

However, in the above-mentioned prior art, the source selection operation must be performed and then the system selection operation must be performed, which is troublesome and the source and AV amplifiers must be connected. Not only the person who connected the source but also the person who has connected the source and the AV amplifier, with the passage of time, each audio source device can be connected to the AV amplifier by either analog input, coaxial input or optical input. There was a problem that it was troublesome to operate the system selection operation because it was not known whether it was connected to. In addition, in recent years, a new surround standard called AC-3 has been added to LDs (front Lch and Rch, surround Lch and Rch, center ch, subwoofer ch, total 6ch). It is supposed to add and input a new system.
However, when reproducing an AC-3 standard LD, the AV amplifier must be switched to RF input.
Since the LD which is not 3 standard does not receive the signal at the RF input, the system must be switched to one of the optical input, the coaxial input and the analog input. For this reason, not only system selection must be performed according to the audio source device, but system selection must also be performed by software, which makes the system selection operation even more difficult. The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide an audio input switching device in which the effort of selecting an input system is reduced.

[0005]

In the audio input switching device according to the present invention, an RF input, an optical input, a coaxial input,
Of the analog inputs, it has at least two input systems,
In an audio input switching device provided with a system selecting means for selecting one system from these input systems, converting it to a predetermined signal format and outputting it, the system of the input system having an input at present in the system selecting means. Detecting means for detecting
Among the systems detected by the detecting means, RF input, optical input,
And a discriminating means for discriminating the one having the highest priority when viewed from the priority order of the coaxial input and the analog input, and the system selecting means is discriminated by the discriminating device from the inputs of a plurality of input systems. It is characterized in that it is configured to output an object in a predetermined signal format.

Another audio input switching device according to the present invention has two or more input systems among RF input, optical input, coaxial input, and analog input, and each of a plurality of audio sources and at least one system. Connectable, and for at least one audio source, 2
The input connection means capable of simultaneously connecting the above systems, the source selection operation means for performing the source selection operation, and the audio source desired by the user selected by the source selection operation means among the inputs to the input connection means In addition, in the audio input switching device, which includes one of an RF input, an optical input, a coaxial input, and an analog input, and which selects and outputs the signal after converting it into a predetermined signal format, the user is selected as the selecting means. In the case where the detection means for detecting the system having the input currently in the desired audio source and the system detected by the detection means are viewed in the order of priority of RF input, optical input, coaxial input, and analog input. And a selection unit for determining the highest priority one, and the selection unit outputs the one of the inputs to the input connection unit that is determined by the determination unit in a predetermined signal format. It is characterized in, that it has constructed.

[0007]

The audio input switching apparatus according to the present invention has at least two input systems of RF input, optical input, coaxial input, and analog input, and selects one system from these input systems. In an audio input switching device provided with a system selecting means for converting to a predetermined signal format and outputting the same, at least two of the RF input, the optical input, the coaxial input, and the analog input are currently input. A system of a certain system is detected, and among the detected systems, the system having the highest priority is discriminated in terms of the priority of RF input, optical input, coaxial input, and analog input. Then, the input discriminated by the discriminating means from among the plurality of inputs is output in a predetermined signal format. This allows
In the system with the current input, the system can be automatically switched to the system with the highest priority when viewed from the priority order of RF input, optical input, coaxial input, and analog input, so the user does not have to select the system. Even so, you can listen to music with the best sound quality.

Further, according to another audio input switching device of the present invention, it has two or more input systems among RF input, optical input, coaxial input and analog input, and at least one with each of a plurality of audio sources. It is possible to connect with one system, and for at least one audio source, input connection means capable of simultaneously connecting two or more systems, source selection operation means for selecting a source, and input to the input connection means. A selection of the audio source desired by the user, which has been selected by the source selection operation means, and which is selected from RF input, optical input, coaxial input, and analog input, converted into a predetermined signal format, and output. Means and
In the audio input switching device including the above, a system having an input is currently detected in the audio source desired by the user, and in the detected system, the RF input, the optical input, the coaxial input, and the analog input are prioritized. Determine the highest priority when viewed. Then, the input discriminated by the discriminating means among the inputs to the input connecting means is output in a predetermined signal format. As a result, among the audio sources desired by the user, the system having the current input, and the RF input,
The system can automatically switch to the system with the highest priority in terms of the priority order of optical input, coaxial input, and analog input, so the user only needs to perform the source selection operation without the system selection operation. You can listen to music with the best sound quality for each source.

[0009]

1 is a block diagram of an audio system of an AV amplifier according to an embodiment of the present invention. Reference numeral 10 denotes an input connection means, which has an RF input, an optical (OPTICAL) input, a coaxial (COAXIAL) input, and an analog (ANALOG) input. Each of the three systems except the RF input is a CD player or an MD player. , A satellite TV broadcast receiving tuner, and an LD player can be simultaneously connected to four types of audio source devices, and an RF input can be connected to the LD player. Of the input connection means 10, 11 _1L , 11 _1R , 1
1 _2L , 11 _2R , 11 _3L , 11 _3R , 11 _4L , 11 _4R are CDs
Player, MD player, satellite TV broadcast receiving tuner,
Analog input terminals that can be connected to the analog output of the LD player, and 11 _5L and 11 _5R are analog input terminals that can be connected to the output of any analog audio source device (AA). 12 _{1 to} 12 ₄ are CD players, MD players,
A coaxial input connector that can be connected to the coaxial output that is one of the digital outputs of the satellite TV broadcast reception tuner and the LD player. 13 _{1 to} 13 ₄ are digital outputs of the CD player, the MD player, the satellite TV broadcast reception tuner, and the LD player. An optical input connector that can be connected to another one, an optical output, and the optical input connector has an optical-electrical conversion function. Reference numeral 14 is an RF input terminal connectable to the AC-3 RF output of the LD player. The digital output of each audio source device is made in an audio interface format called IEC958.

Reference numeral 20 denotes a source selection operation for selecting a desired one of a CD player, an MD player, a satellite TV broadcast receiving tuner, an LD player, and an analog audio device, and a sound field processing mode in a DSP described later. Is an operation means for performing a designated operation. Reference numeral 30 denotes a selection means, which is an audio source desired by the user among the inputs to the input connection means 10, and there is currently an input from each input system of RF input, optical input, coaxial input, and analog input, The best one is selected, converted into a predetermined signal format, and output (the sound quality is best for the RF input, and is assumed to be lower in the order of the optical input, the coaxial input, and the analog input). Among the selection means 30, 40 is an analog source selector (hereinafter referred to as “source selector”), 41 is a first digital source selector (hereinafter referred to as “source selector”), and 42 is a second digital source selector (hereinafter referred to as “source selector”).
“Source selector”), and the user operates the operating means 20 for each system of analog input, coaxial input, and optical input according to the switching control of the controller described later.
The desired source selected in step 3 is selected and output.

The analog source selector 40 has analog input terminals 11 _1L , 11 _2L , 11 _3L , 11 on the input side.
Analog selector switches ASW _1L , ASW _2L , ASW which are individually connected to _4L and _115L, and whose output sides are commonly connected
_3L , ASW _4L , ASW _5L (hereinafter, simply referred to as “switch”), and the input side is analog input terminal 11 _1R , 11
_2R , 11 _3R , 11 _4R , 11 _5R are individually connected, and the output side is commonly connected to an analog selector switch ASW _1R ,
It has ASW _2R , ASW _3R , ASW _4R , and ASW _5R (hereinafter, simply referred to as “switch”). The input side of each of the first digital source selectors 41 is the coaxial input connector 1
2 _{1-12 4} are individually connected to the output side has a digital selector switch DSW ₁ ~DSW ₄ which are commonly connected, a second digital source selector 42 respectively,
It has digital selector switches DSW _{5 to} DSW ₈ (hereinafter, simply referred to as “switches”) whose input side is individually connected to the optical input connectors 13 _{1 to} 13 ₄ and whose output side is commonly connected. Each switch of each source selector 40-42 is selectively turned on / off by the controller.

Reference numeral 50 is a system selecting means for selecting one system from RF input, optical input, coaxial input and analog input, converting it to a predetermined signal format and outputting it (in this embodiment, the system selecting means is Do some of the source selection operation). Of these, 51 is a D / A converter which is provided on the output side of the analog input system of the source selector 40, and which D / A converts the L and R 2ch analog audio signals at a sampling frequency of 48 kHz, and 52 is an RF input. A demodulator provided on the output side of the terminal 14 (for example, a Pioneer PD
4606A), and when an RF signal for AC-3 surround is input from the LD player, predetermined demodulation processing is performed and an audio interface format signal called IEC958 is output (front Lch and Rch for output signals, surround Lch). And Rch, center ch, and subwoofer (SW) ch for 6 ch of compressed audio signals are included). This demodulator 52 is R
It has a built-in PLL circuit (not shown) for reproducing the clock component of the F signal and reading the data. This PLL circuit has a function of detecting the presence or absence of an RF input by detecting the unlock when the PLL loop is unlocked, and when the unlock is detected, the demodulator 52
Outputs a high level error signal ERROR ₁ .

Reference numeral 53 denotes a DIR (digital interface receiver, for example, Sanyo Denki LC8904Q).
And has three input terminals IN1 to IN3 for inputting the output of the demodulator 52 and the coaxial input system and the optical input system which are the outputs of the source selectors 41 and 42, and a built-in selector (not shown) under the control of the controller. No.) selects one system input, and a PLL circuit (not shown) reproduces a clock component to read data. Then, management information (control information) is extracted, and sampling frequency data (44.1 kHz for CD and MD, included in the management information,
The satellite TV broadcast reception tuner outputs audio sample data (compressed audio sample data in the case of RF input) having a sampling frequency that matches 32 kHz or 48 kHz in Japan and 44.1 kHz in LD.
The PLL circuit built in the DIR53 detects the unlock when the PLL loop is unlocked,
Has a function to detect the presence / absence of input of the system currently selected by the built-in selector of DIR 53, and when unlock is detected, DIR 53 outputs high level error signal ERROR.
Outputs ₂ . The DIR 53 also has a function of outputting to the controller the management information (including data indicating whether the AC-3 standard is met, sampling frequency data, etc.) read from the input data of each system.

Reference numeral 54 is a circuit for switching between an analog system and a digital system, which includes digital switches DSW ₉ and DS.
Each W ₁₀ (hereinafter, simply referred to as “switch”) has its input side individually connected to the output sides of the A / D converter 51 and DIR 53, and its output side is commonly connected and then connected to the DSP in the subsequent stage. The switching circuit 54 is switching-controlled by the controller. Reference numeral 55 denotes a controller having a microcomputer configuration, which responds to the source selection operation of the user by the operating means 20 and the source selectors 40 to 42 and the DIR 5.
The selection control of the source desired by the user is performed by performing the switching control of the built-in selector (not shown) 3 and the switching circuit 54. When a source other than the analog audio source device is selected, the DI
DIR while controlling switching of built-in selector of R53
Error signal ER output from PLL circuit built in 53
Check ORR ₂ to detect the system with the current input among RF input, optical input, coaxial input, and analog input (in the case of LD), or detect the current input among optical input, coaxial input, and analog input. Detect existing systems (CD, MD, satellite TV broadcast reception tuner). And of the detected lines,
The system with the highest sound quality is determined by determining the system having the highest priority in the order of priority of RF input, optical input, coaxial input, and analog input, and switching the built-in selector of the DIR 53 and the switching circuit 54 based on the determination result. The audio sample data is automatically selected and output to the subsequent stage. In this embodiment, the selection means 30 comprises source selectors 40-42,
The system selection means 50 includes a controller 55, and the system selection means 50 includes an A / D converter 51 and a demodulator 5.
2, DIR 53, switching circuit 54, controller 55
Consists of

Reference numeral 60 denotes a DSP (digital signal processor, for example, ZR38500 manufactured by ZORAN), which performs a predetermined sound field control process according to an instruction from the controller 55, and outputs a front Lch (FL) and a front Rch (F).
R), Surround Lch (SL), Surround Rch
(SR), center (C) ch, subwoofer ch (S
The audio sample data for 6 ch of W) is output. Reference numerals 61 _{1 to} 61 ₃ denote D / A converters that perform D / A conversion of 6ch audio sample data for each 2ch, 62 ₁
To 62 ₆ is a mute circuit is on-off controlled by a controller 55. Mute circuits 62 _{1 to} 62
The output sides of ₆ are respectively connected to the speakers of FL, FR, SL, SR, C, and SW via a volume adjusting circuit and a power amplifying circuit (none are shown).

2 to 4 show the AV by the controller 55.
6 is a flowchart showing a control process of an audio system of an amplifier, and the operation of the above-described embodiment will be described below with reference to these drawings. In addition, in advance, the user operates the operation unit 20.
Then, it is assumed that an audio source other than the AC-3 software of the LD is designated to be reproduced in the sound field in the pro logic mode. When the LD user performs an LD player selection operation using the operation means 20, the controller 55 first causes the mute circuits 62 _{1 to} 62 _{1 to} 6 respectively.
Mute on control is performed on ₂₆ to mute the music output, and the switch DSW ₉ of the switching circuit 54 is turned off.
Turn on the DSW ₁₀ to switch to the digital system. Further, a 3 second timer described later is stopped (steps S1 to S3 in FIG. 2). Since the selected source is LD, the switches ASW _4L and ASW _{4R of the} source selector 40 are selected.
Is turned on, the other is turned off, the switch DSW ₄ of the source selector 41 is turned on, the other is turned off, the switch DSW ₈ of the source selector 42 is turned on, and the other is turned off to perform the source selection control of the LD ( Steps S4 and S5).

In the case of LD, RF input, optical input,
Since both coaxial input and analog input are conceivable, the controller 20 controls the DIR 53 to switch the built-in selector (not shown) to the IN3 position, and whether or not the error signal ERROR ₂ is at high level, that is, D
Whether or not an input error has occurred in the IR 53 is checked to detect the presence / absence of input from the LD player to the RF input system (steps S6 and S7). If it is not high, it is considered that there is an RF input according to the AC-3 standard. In this embodiment, just in case, it is checked whether the RF signal is surely present by checking whether the error signal ERROR _{1 of the} demodulator 52 is also at a high level, that is, whether the demodulator 52 has an input error. Yes (step S8). If NO in step S8, the 3-second timer described later is stopped (step S9), and the current D
After confirming that the IR53 is switched to IN3 (step S10), the management information obtained from the RF input system from the DIR53 is input, and the DS based on the management information.
Sampling frequency 44.1kHz, AC for P60
-3 Set the operating mode in surround (step S1
1) Then, mute off control is performed on each of the mute circuits 62 _{1 to} 62 ₆ and the process returns to step S1 (step S12).

LD is software based on AC-3, and L
When the RF output of the D player is connected to the RF input terminal 14, the RF signal is output from the demodulator 5 as described above.
The digital audio interface format signal according to IEC958 is demodulated. Then, it is converted into a compressed audio sample data string for 6 channels by the DIR 53 and input to the DSP 60. D
SP60 decompresses compressed audio sample data,
Two channels are output to the DA converters 61 _{1 to} 61 ₃ . As a result, a rich surround sound field based on AC-3 can be enjoyed. In addition, if there is an input from the RF input system, the sound field can be automatically reproduced in AC-3, which saves the user the trouble of switching the input system.

If the AV amplifier is connected to the LD player via RF input and optical input, but the LD is not AC-3 software, or even if the LD is AC-3 software, it is not connected to RF input, If it is connected to the optical input, YES is obtained in step S7, the DIR 53 is controlled to switch the built-in selector (not shown) to the IN2 position, and it is checked whether or not the error signal ERROR ₂ is at the high level. Whether or not there is an optical input system input from the LD player is detected (steps S22 and S23 in FIG. 3).
If it is not high, it is considered that there is an optical input system. At this time, the controller 55 inputs the management information obtained from the optical input system from the DIR 53, and the management information and the user previously operate the operation means 20 for other than the AC-3 software.
Based on the surround mode specified in step 4, the DSP 60 is set to a sampling frequency of 44.1 kHz and an operation mode of professional logic (step S24), and then the mute circuits 62 _{1 to} 62 _{6 are} muted off and stepped. The process returns to S1 (step S12 in FIG. 2).
In Pro Logic, the DSP 60 performs appropriate signal processing on the L and R 2ch audio signals to artificially generate FL and F signals.
Audio signals for 6 channels of R, SL, SR, C and SW are created. As a result, if the source is compatible with Pro Logic, sound field reproduction close to that of AC-3 is performed, and even if it is not compatible with Pro Logic, a certain amount of surround sound can be enjoyed.

Further, when the LD player is connected by RF input and coaxial input, but the LD is not AC-3 software,
Alternatively, if the LD is not connected to the RF input but is connected to the coaxial input even with the AC-3 software, YES is determined in step S23 of FIG.
Controls IR53 to turn on the built-in selector (not shown) to IN1.
By checking whether ERROR ₂ is at a high level or not, the presence or absence of input of the coaxial input system from the LD player is detected (step S2 of FIG. 3).
5, S26). If it is not high, it is considered that there is a coaxial input system. At this time, the controller 55
The management information obtained by the coaxial input system from the IR 53 is input, and based on the management information and the surround mode designated by the user in advance by the operation means 20 for other than the AC-3 software, the sampling frequency 44. 1kH
z, set the operation mode in Pro Logic (step S
24) After that, mute-off control is performed on each of the mute circuits 62 _{1 to} 62 ₆ and the process returns to step S1 (step S12 in FIG. 2).

If the LD player is connected to the RF input and the analog input but the LD is not AC-3 software, or if the LD is AC-3 software but not connected to the RF input, it is connected to the analog input. If YES in step S26, the controller 55 turns on the switch DSW ₉ of the switching circuit 54, because the answer in step S26 of FIG. 3 is YES.
Turn off SW ₁₀ and switch to the analog side (step S
27). Then, the sampling frequency of 48 kHz and the operation mode of the professional logic are set to the DSP 60 (step S28), and then the mute circuits 62 _{1 to} 6 _{1 to} 6 are set.
Mute-off control is performed on _26, and the process returns to step S1 (step S12 in FIG. 2). Thus, when there is no input from the RF input system, the controller 55 sets the DIR5
In cooperation with 3, detect the system with input among optical input, coaxial input, and analog input, and then determine the system with the highest priority among optical input, coaxial input, and analog input. Since the signal converted into the audio sample data string in the discriminated system is input to the DSP 60, even if the user does not perform the system switching operation, the music with the highest sound quality other than the AC-3 surround sound field is produced. It can be heard automatically.

When listening to the source of the LD in a mode other than the AC-3 mode, the controller 55 constantly checks the ERROR ₁ of the demodulator 52, and the software is changed to AC-3 and the RF input system is used. Is input and the level becomes low, it is determined to be NO in step S8 of FIG. At this time, the controller 55 stops the 3-second timer (step S9), and the input of the DIR 53 becomes IN.
After confirming that it is not 3 (step S10), if the switching circuit 54 is switched to the analog system, it is switched to the digital system (step S3). Then, the DIR 53 is switched to IN3 and it is checked whether ERROR ₂ is high (steps S4 to S7). Step S
If it is not high in the check of 7, it is judged that the RF input is surely present, the management information obtained from the system of the RF input is input from the DIR 53, the sampling frequency based on AC-3 is input to the DSP 60, 44.1 kHz, AC. The operation mode in -3 is designated (step S11). This allows
Until then, even if I was listening to the LD in a mode other than AC-3 mode,
When an RF input is input, the sound field can be automatically reproduced in AC-3, which saves the user the trouble of switching the input system.

In contrast to this, when listening to the LD source in the AC-3 mode by RF input, if a search is made in the AC-3 software on the LD player side, the time is shorter than 3 seconds. The input to the demodulator 52 results in an error. At this time, the controller 55 determines YES in step S8 of FIG. 2 and confirms that the RF input system is currently selected and that the 3-second timer is stopped (steps S13 and S14). The built-in 3-second timer is started (step S15). And
Demodulator 5 before the 3-second timer expires
If the error signal ERROR _{1 of} 2 goes high, LD
The player determines that the search has been completed, and continues the selection of the RF input with the 3-second timer stopped (steps S16, S10, S3 to S9).

If the source of LD is AC by RF input
When the AC-3 software is ended while listening in the -3 mode, the input of the demodulator 52 thereafter becomes an error. At this time, the controller 55 also determines YES in step S8 of FIG. 2, and after confirming that the RF input system is currently selected and the 3-second timer is stopped (steps S13 and S14), The built-in 3-second timer is started (step S15). If the error signal ERROR ₁ of the demodulator 52 becomes high until the 3-second timer times out, it is determined that the AC-3 software has ended and the 3-second timer is stopped (step S17), and then the output mute is turned on. Yes (step S1
8). Then, the process proceeds to step S22 and subsequent steps in FIG. 3, and there is the current input among the optical input, the coaxial input, and the analog input,
Switch to the system with the highest priority.

When the CD, MD, or TV user selects the CD player or the MD player or the satellite TV broadcast receiving tuner by the operation means 20, the controller 55 turns on the output mute and switches the switching circuit 54 to the digital side, The source selectors 40 to 42 are controlled to select the source desired by the user (steps S1 to S4 in FIG. 2, step S20 in FIG. 3,
S21). For example, in the case of a CD, the switches ASW _1L and ASW _1R in the source selector 40 are turned on, the others are turned off, the switch DSW ₁ in the source selector 41 is turned on, the others are turned off, and the source selector 42 is turned on. Switch D
Turn on SW ₅ , turn off others.

Then, in the sources of CD, MD and TV, R
Since there is no F input, first input the DIR 53
Switch to 2 and check if there is an optical input system input (steps S22 and S23 in FIG. 3).
The management information obtained from the optical input system from 53 is input, and based on the management information and the surround mode previously specified by the user with the operating means 20 for other than AC-3 software, D
Sampling frequency 44.1kHz for SP60, operation mode set by Pro Logic is set (step S2
4) Then, mute off control is performed on each of the mute circuits 62 _{1 to} 62 ₆ and the process returns to step S1 (step S12 in FIG. 2). When there is no optical input system input (YES in step S23), it is checked whether there is a coaxial input system input (steps S25 and S2 in FIG. 3).
6), if there is, input the management information obtained from the DIR 53 in the coaxial input system, and the management information and the user previously input the AC
Based on the surround mode designated by the operating means 20 for software other than -3 software, a sampling frequency of 44.1 kHz and an operation mode of professional logic are set for the DSP 60 (step S24).
Mute-off control is performed for 2 _{1 to 6 26} and step S
It returns to 1 (step S12 of FIG. 2).

When there is no input of the coaxial input system (YES in step S26), the switch D of the switching circuit 54 is switched.
SW ₉ is turned on and DSW ₁₀ is turned off to switch to the analog side (step S17), the sampling frequency is set to 48 kHz and the operation mode in the professional logic is set (step S28), and then each mute circuit 62 ₁
To 62 ₆ to mute off control to return to step S1 (step S12 in FIG. 2). As described above, there is no RF input, but a CD, MD, TV that can have both digital input by coaxial input or optical input and analog input.
When is selected, the controller 55 cooperates with the DIR 53 to detect the system with the input among the optical input, the coaxial input, and the analog input, and then selects the optical input, the coaxial input, and the analog input in the order of priority. The highest ranked line,
Since the signal converted into the audio sample data string in the discriminated system is input to the DSP 60, even if the user does not perform the system switching operation, the music with the highest sound quality other than the AC-3 surround sound field is automatically generated. Can be listened to. Moreover, since it is not checked whether the RF input system is input, the automatic selection of the optimum system is completed in a short time.

When the power source of the source device desired by the user, for example, the MD player, has not been turned on when the operation of selecting any of the LD, CD, MD, and TV sources is performed, the controller is selected. 53 is first switched to the analog input system (YE in step S7 of FIG. 2).
S, YES in steps S23 and S26 of FIG. 3, and steps S27 and S28). At this time, the input of the DIR 53 is switched to IN1 in step S25 of FIG. After this, the controller 55 performs step S in FIG.
In step S8, the error signal ERROR ₁ of the demodulator 52 is checked to see if it is high. The RF input system of the LD player is not connected to the AV amplifier, or the power of the LD player is off, or the power of the LD player is on but AC-3 software is not applied, and the demodulator When the error signal ERROR _{2 at} 52 is high, the controller 55 determines YES in step S8.

Since the RF input system is not currently selected, the process proceeds to step S30 in FIG.
Check if any of D, MD, or TV source is selected. Since it is YES here, it is further checked whether the analog input system is being selected (step S31). Since it is also YES here, the input of the DIR 53 is then IN2.
Check (step S32), and NO at first, so I
Switch to N2 (step S33). And D
It is checked whether the error signal ERROR ₂ of IR53 is high (step S35). If the power source of the MD player is not turned on yet, ERROR ₂ is high, and the controller 55 determines YES in step S35, returns to step S1 in FIG. 2, and repeats the same processing.

Then, when the next step S32 shown in FIG. 4 is reached, the result is YES this time, so the controller 55 makes an IN
It is switched to 1 (step S34). And DI
It is checked whether the error signal ERROR _{2 of} R53 is high (step S35). If the power source of the source device desired by the user has not been turned on yet, ERROR ₂ is high, and the controller 55 determines YES in step S35, returns to step S1 in FIG. 2, and repeats the same processing. After that, when the power of the MD player desired by the user is turned on, assuming that the MD player is connected to the AV amplifier through the optical input system and the analog input system, the input of the DIR 53 is set to IN2 in step S33. Immediately after the switching, the check in step S35 is NO.
At this time, the controller 55 mutes the output (step S36), and switches DSW _{9 of the} switching circuit 54.
Is turned off, the DSW ₁₀ is turned on to switch to the digital side (step S37), and the output mute is turned off (step S12 in FIG. 2). As a result, even when the analog system is selected because the power of the MD player desired by the user was initially off, if the power of the MD player desired by the user is turned on and an input comes in through the optical input system,
Since the system automatically switches to the optical input system, the user can save the trouble of switching from the analog system to the optical system.

Analog audio source For example, an analog cassette deck with an analog input terminal 1
The user operates the operation means 20 in the state of being connected to 1 _5L and 11 _5R.
When the analog cassette deck is selected as the desired source, the controller 55 turns on the output mute and once switches the switching circuit 54 to the digital side.
The source selectors 40 to 42 and the switching circuit 54 are controlled to select the source desired by the user (step S1 in FIG. 2).
~ S4, S20, S29, S27 of FIG. 3). Specifically, in step S29, the switches ASW _5L and ASW _5R of the source selector 40 are turned on and the others are turned off (the switching of the source selector 41 and the source selector 42 is arbitrary). Further, in step S27, the switching circuit 5
Turn on the switch DSW ₉ of 4 and turn off DSW ₁₀ to switch to the analog system.

Then, a sampling frequency of 48 kHz and an operation mode of professional logic are designated to the DSP 60 (step S28), and mute off control is performed to perform step S1.
(Step S12). In this way, when the analog audio source is selected, the controller 55 immediately switches to the system of analog input, so that the music of the desired source can be automatically listened to without the user switching the system. . Moreover, since it is not checked whether there is an input for each system, the automatic selection of the optimum system is completed in an extremely short time.

In the above embodiment, the demodulator 52 and the DIR are set in steps S7 and S8 of FIG. 2, steps S23 and S26 of FIG. 3, and step S35 of FIG.
The ERROR ₁ output and the ERROR ₂ output of 53 are checked only once to determine whether or not there is an input error. You may decide whether or not. Further, while listening to any one of the sources of CD, MD, TV, and LD by the system of analog input, the controller 55 switches the built-in selector of the DIR 53 and switches from the output state of ERROR ₂ to RF input, optical input,
Check if there is no input from one of the coaxial input systems, and if it is, the system automatically switches to that system, even if you start listening in a low sound quality state.
You may automatically make it possible to listen in a high sound quality state. Further, when NO in step S9 of FIG. 2, the process returns to step S3, but may return to S2.

[0034]

The audio input switching device according to the present invention has at least two input systems of RF input, optical input, coaxial input, and analog input, and selects one system from these input systems. Then, in the audio input switching device provided with the system selecting means for converting the signal into a predetermined signal format and outputting the signal, an RF input, an optical input, a coaxial input,
Of the analog inputs, at least two of the input systems are detected as the system that currently has an input system, and among the detected systems, RF input, optical input, coaxial input, and analog input are prioritized. If it does, the one with the highest priority is determined. Since the input discriminated by the discriminating means is output from a plurality of input systems in a predetermined signal format, the system having the present input, and further, the RF input, the optical input, the coaxial input, and the analog input. When viewed in the order of priority, it will automatically switch to the system with the highest priority,
It is possible to listen to music with the best sound quality without the user performing a system selection operation.

Further, according to another audio input switching device of the present invention, it has two or more input systems among RF input, optical input, coaxial input and analog input, and at least one with each of a plurality of audio sources. It is possible to connect with one system, and for at least one audio source, input connection means capable of simultaneously connecting two or more systems, source selection operation means for selecting a source, and input to the input connection means. A selection of the audio source desired by the user, which has been selected by the source selection operation means, and which is selected from RF input, optical input, coaxial input, and analog input, converted into a predetermined signal format, and output. Means and
In the audio input switching device including the above, a system having an input is currently detected in the audio source desired by the user, and in the detected system, the RF input, the optical input, the coaxial input, and the analog input are prioritized. Determine the highest priority when viewed. Then, among the inputs to the input connection unit, the ones discriminated by the discriminating unit are output in a predetermined signal format, so that among the audio sources desired by the user, the system having the current input and the RF input , Optical input, coaxial input, analog input is automatically switched to the highest priority system when viewed in order of priority, so the user only needs to perform source selection operation, without performing system selection operation. You can listen to music with the best sound quality for your desired source.

[Brief description of the drawings]

FIG. 1 is a block diagram of an audio system of an AV amplifier according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the controller.

FIG. 3 is a flowchart showing the operation of the controller.

FIG. 4 is a flowchart showing the operation of the controller.

[Explanation of symbols]

10 Input Connection Means 20 Operation Means 30 Selection Means 40 Analog Source Selector 41 First Digital Source Selector 42 Second Digital Source Selector 50 System Selection Means 51 A / D Converter 52 Demodulator 53 DIR 54 Switching Circuit 55 Controller 60 DSP

Claims (2)

[Claims] 1. At least two input systems of RF input, optical input, coaxial input, and analog input are provided, and one system is selected from these input systems, converted into a predetermined signal format, and output. In an audio input switching device equipped with a system selecting means, the selecting means includes a detecting means for detecting a system having an input system at present, and an RF input, an optical input, among the systems detected by the detecting means.
The discriminating means for discriminating the one having the highest priority in the priority order of the coaxial input and the analog input is provided, and the system selecting means is discriminated by the discriminating device from the inputs of a plurality of input systems. An audio input switching device, characterized in that it is configured to output an object in a predetermined signal format. 2. An RF input, an optical input, a coaxial input, and an analog input, which has two or more input systems and can be connected to each of a plurality of audio sources by at least one system, and at least one audio source. Is 2
The input connection means capable of simultaneously connecting the above systems, the source selection operation means for performing the source selection operation, and the audio source desired by the user selected by the source selection operation means among the inputs to the input connection means In addition, in the audio input switching device, which includes one of RF input, optical input, coaxial input, and analog input, and which selects and outputs the signal after converting it into a predetermined signal format, the user selects the user as the selecting means. Among the desired audio sources, there is a detection means for detecting a system having an input system at present, and among the systems detected by the detection means, an RF input, an optical input,
And a determining means for determining the highest priority of the coaxial input and the analog input in the order of priority, and the selecting means is determined by the determining means from the inputs to the input connecting means. Is configured to be output in a predetermined signal format.