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ç½®ã«é¢ãããã®ã§ãããBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier device used in an AV system or the like, and more particularly to an amplifier device for accurately switching an input audio signal from an audio source between a left and right analog audio signal and a multi-analog audio signal. The present invention relates to a possible amplifier device.
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çãè¡ãããã«ãã¦ããã2. Description of the Related Art An AV receiver receives audio signals from a plurality of audio sources and amplifies the signals to a center speaker, a rear left / right speaker, and a sub woofer depending on the connection state of the output side to the front left and right speakers and the AV receiver. It is designed to output audio signals. Hereinafter, speakers other than the front left and right speakers,
For example, the center speaker, the rear left and right speakers, and the subwoofer will be referred to as âsurround speakersâ.
The AV receiver is a DVD (digital versatile disc:
For a predetermined audio source such as a digital varsatile disk (Player) player, three types of inputs are received, for example, a digital audio signal, an analog audio signal for left and right speakers, and a multi-analog audio signal for left and right speakers and surround speakers. In addition, a process according to the type of the input audio signal is performed.
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ããæåã§é¸æãã¦ãããIn a conventional AV receiver, a user manually designates which audio source to input an audio signal from in an input selector, and then manually determines which type of audio signal to input from the selected audio source. You have selected.
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è¦ããããAn AV which automatically determines whether an input audio signal from an audio source is a digital audio signal or an analog audio signal and selects one of a digital audio signal and an analog audio signal.
Receivers are known, but when the input audio signal is an analog audio signal, there is no automatic selection between left and right channel analog audio signals and multi-channel analog audio signals.
Further, in order to select a multi-analog audio signal as an input audio signal, it is assumed that A
Since surround speakers need to be connected to the V receiver in addition to the left and right speakers, the user determines the selection of the type of the input audio signal from the DVD player, including the status of the speakers connected to the AV receiver. There is a need to. Therefore, it is not enough to simply determine whether the input analog audio signal from the audio source is of the left or right channel or multi-channel and automatically select the type of the input audio signal.
Also determine the status of the speaker connected to the receiver,
You need to select the right kind of audio signal.
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ç½®ãæä¾ãããã¨ã§ãããAn object of the present invention is to provide an amplifier device capable of appropriately selecting the type of an input audio signal from a selected audio source.
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ãå¦çåæ¿ææ®µThe amplifier device of the first invention has the following. A multi-channel analog audio signal including a digital audio signal, a left / right channel analog audio signal, and a left / right channel analog audio signal and at least one surround channel analog audio signal from a predetermined audio source; An amplifier that is always connected to the left and right speakers and that connection to at least one surround speaker is optional, and that the connected speaker can output a corresponding audio signal amplified by an amplifier circuit to the speaker. In an apparatus, an input audio signal discriminating means for discriminating whether an audio signal input from an audio source is a digital audio signal, a left and right analog audio signal, or a multi-analog audio signal Connection detection means for detecting whether or not a connection is being made to the surround speakers. If the audio signal input from the audio source is a left and right analog audio signal, the left and right analog audio signals are processed by a digital signal processor and an amplifier circuit. If the audio signal input from the audio source is a multi-analog audio signal and is being connected to a surround speaker, the multi-analog audio signal is skipped by the digital signal processor. Processing switching means for processing by an amplifier circuit and then sending it to the front left and right speakers and the surround speakers
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ãµãã¦ã¼ãã¼ãè¨ããã®ã¨ããã[0008] The amplifier device may be an audio-only amplifier device or an AV receiver (AV: audio and visual; Audio & Visual). The multi-channel is a total of six channels in a normal amplifier device, but includes an arbitrary number of three or more channels as long as it includes at least one surround channel in addition to the left and right channels.
Audio sources that can selectively output left and right channel analog audio signals and multi-channel analog audio signals are, for example, DVD players and personal computers. The connection between the audio source and the amplifier device may be made by a USB cable, an IEEE 1394 cable, or wireless (radio wave, infrared), in addition to a normal audio cable such as a conductor or an optical fiber. The surround speakers refer to speakers other than the front left and right speakers, for example, a center speaker, a rear left and right speaker, and a subwoofer.
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Whether the input audio signal is a digital audio signal, a left / right channel analog audio signal, or a multi-channel analog audio signal can be determined by detecting the presence or absence of the input signal in the surround channel cable.
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The processing of the audio signal inside the amplifier device differs depending on whether it is a multi-channel analog audio signal and whether or not it is being connected to a surround speaker. The multi-analog audio signal from the audio source can be output to each corresponding speaker to generate audio by simply amplifying by an amplifier circuit without performing special processing. On the other hand, a digital audio signal requires processing by a digital signal processor for decoding, and the left and right channel analog audio signals also generate a surround analog audio signal from them in the surround mode. As needed, it is sent to the digital signal processor. In this amplifier device, the input audio signal determining means determines whether the input audio signal is a digital audio signal, a left / right channel analog audio signal, or a multi-channel analog audio signal. It is detected whether or not the input audio signal is being connected to the surround speaker, and the processing switching means converts the input audio signal based on the determination result of the input audio signal determination means and the detection result of the connection detection means in accordance with a corresponding process. Since the input mode (selection mode for the type of the input audio signal) is to be selected, the user does not need to specify the input mode to the amplifier device one by one.
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æ¿ææ®µAn amplifier device according to a second aspect of the present invention is the same as the amplifier device according to the first aspect, but further includes the following. Surround mode detection means for detecting whether or not a surround mode is set. If the audio signal input from the audio source is a left and right analog audio signal in the surround mode, a surround audio signal is output from the left and right analog audio signals by a digital signal processor. Processing switching means for generating a signal and outputting the surround audio signal
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ã§ããã[0013] In the surround mode, in addition to the left and right channel audio signals for the left and right speakers,
It refers to a mode in which a surround channel audio signal for a surround speaker is output. Thus, when the amplifier device is in the surround mode and the left and right channel analog audio signals are input, the digital signal processor generates the surround channel analog audio signals from the left and right channel analog audio signals, and the user can enjoy the surround mode.
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ã«ãªã£ã¦ãããAccording to the amplifier device of the third invention, in the amplifier device of the second invention, when the audio signal input from the audio source is a digital audio signal, the processing switching means converts the digital audio signal into a digital audio signal. The signal is processed by a digital signal processor and an amplifier circuit and then sent to the front left and right speaker output terminals.
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ããªã¼ãã£ãªãæ¯éãªãåºåãããã¨ãã§ãããIf the input audio signal is a digital audio signal, processing such as decoding is required. The digital audio signal is sent to a digital signal processor and processed, so that audio from the left and right speakers is not affected. Can be output.
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¥åããããEmbodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are one and other partial views showing the main part configuration of the AV system 10 in a partially overlapping manner. The AV system 10 includes an AV receiver 40 and a plurality of audio sources including a DVD player 41 (audio sources other than the DVD player 41 are not shown). The AV receiver 40 has a VIDEO1 input unit, and a DVD player 41 in the AV system 10 is connected to the VIDEO1 input unit. Digital audio signal input terminal 43 for digital audio signal, analog audio signal input terminal 4 for analog audio signal
4a, 44b, 44c, 44d, 44e, 44f, and a reproduction information input terminal 45 for reproduction information.
8. Analog audio signal cables 49a, 49
b, 49c, 49d, 49e, 49f, and a digital audio signal input terminal 43 and an analog audio signal input terminal 44 via a reproduction information cable 50, respectively.
a, 44b, 44c, 44d, 44e, 44f, and a reproduction information input terminal 45. The digital audio signal input terminal 43 is connected to a DIR (Digital Interface Receiver).
e Receiver) 54. Analog audio signal input terminals 44a, 44b,
44c, 44d, 44e and 44f are DVD players 4
Lch, Rch, Cch, LSch, RSc from 1
h and SWch analog audio signals, which are connected to switches SW13 to SW18, respectively.
Analog audio signal input terminals 44a and 44b are also connected to switches SW11 and SW12, respectively. The reproduction information input terminal 45 is connected to the input terminal of the control microcomputer 53. The output of the DIR 54 is input to a DSP (Digital Signal Processor) 57 via the switch SW3. Switches SW11 and SW12 are connected to the input side of DSP 57. D
SP57 is Lch, Rch, Cch, LSch, RS
Output terminals corresponding to the channels ch and SWch are provided, and each output terminal is connected to each input terminal of the 6-channel amplifier circuit 59 via the switches SW21 to SW26. 6ch amplifier circuit 59
Are input terminals of Lch, Rch, Cch, LS
switch SW13 corresponding to channel, RSch, SWch
To switch SW18. The 6-channel amplifier circuit 59 amplifies each input analog audio signal, and sends each amplified analog audio signal to the corresponding speaker output terminals 61 a to 61 f and the detection terminal of the speaker connection detection circuit 63. Each speaker output terminal 61a-61f is Lc
h, Rch, Cch, LSch, RSch and SWch are connected to speakers (not shown). The speaker output terminals 61a and 61b are connected to the front left and right speakers, and the connection is essential, and the speaker output terminals 61c to 61f are connected to the center speaker, the rear left and right speakers, and the subwoofer, respectively, and , The connection is optional. Speaker connection detection circuit 63
Detects whether or not the speakers are actually connected to the speaker output terminals 61a to 61f from the voltages of the speaker output terminals 61a to 61f, and sends the detected value to the control microcomputer 53. Speaker output terminals 61a-6
When 1f is not connected to the speaker, the speaker output terminals 61a to 61f are in an open state, and the voltage of each speaker output terminal 61a to 61f does not become lower than the reference value. Is connected to the speaker, the effective voltage of each of the speaker output terminals 61a to 61f becomes equal to or lower than the reference value due to the output of the driving current to the speaker. Control microcomputer 53
Performs a predetermined display on the display unit 64, and receives a user instruction via the operation keys 65. The control microcomputer 53 includes switches SW11 to SW18, DIR54,
Switch SW3, DSP57, switches SW21 to SW
26, and a control signal to the display unit 64, and information is input from the reproduction information input terminal 45, the DIR 54, the speaker connection detection circuit 63, and the operation keys 65.
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ããåã³ãªã»ãããããFIGS. 3 and 4 are partial partial views of a flowchart of the analog 2ch switching process executed in the AV receiver 40. Note that the AV receiver 40 is connected to a plurality of audio sources, and the flowchart assumes that the input of the AV receiver 40 is VIDEO1, that is, the input from the DVD player 41 is selected. A step S70 checks (checks) the connection of the speaker to the AV receiver 40. Prior to starting to use the AV system 10, the user
Initially, what kind of speaker is connected to the AV receiver 40 is recorded in a non-volatile memory, and can be appropriately read from the non-volatile memory while the power of the AV receiver 40 is on. The inspection in S70 is performed by calling the initial setting value from the memory.
Can be implemented. Alternatively, a voltage signal is output from the 6ch amplifier circuit 59 to the speaker output terminals 61a to 61f at an appropriate time, and the effective voltage of each of the speaker output terminals 61a to 61f at that time is detected by the speaker connection detection circuit 63. If it is equal to or more than the reference value, that is, if the speaker output terminals 61a to 61f are in an open normal state, it can be implemented by determining that no speaker is connected to the corresponding speaker output terminals 61a to 61f. S71
Then, based on the inspection of S70, the speaker output terminal 61
It is determined whether the corresponding speakers are connected to all of a to 61f, and if the determination is YES, the process proceeds from S72 to S72.
Proceed to 74, and if NO, proceed from S73 to S74.
In S72 and S73, the flag SP_ALL is set and reset, respectively.
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ã¤ããSWï¼ã¯ãªãã«ãªããIn S74, it is determined whether an audio signal is input to the digital audio signal input terminal 43 or not.
That is, it is determined whether a digital audio signal is input from the DVD player 41, and the determination is YES.
If so, proceed to S81 via S75; if NO,
Proceed to S76. In S75, "digital" is selected as the input mode. Selecting "digital" as the input mode means that the input signal of the digital audio signal input terminal 43 has been selected. By selecting âdigitalâ, the switches SW11 to SW18 are turned off, the switches SW21 and SW22 are turned on,
The switch SW3 turns on. In S76, the reproduction information input from the DVD player 41 to the reproduction information input terminal 45 via the reproduction information cable 50 is checked. S77
Then, it is determined whether or not the DVD player 41 is playing a multi-channel DVD based on the inspection in S76,
If the determination is YES, the process proceeds to S78, and if NO, the process proceeds to S79. If the DVD player 41 is playing a multi-channel DVD, the analog audio signal input terminals 44a, 44b, 44c, 44d, 44e, 4
4f, an analog audio signal is input, and DV
If the D player 41 is not playing a multichannel DVD, the analog audio signal input terminals 44a and 44a
An analog audio signal is input only to 4b. S7
At step 8, "analog (2ch)" is selected as the input mode. As a result, the switches SW11 and SW12 are turned on, the switches SW13 to SW18 are turned off, the switches SW21 and SW22 are turned on, and the switch SW3 is turned off. In S79, it is determined whether or not the flag SP_ALL is set. If the determination is YES, the program ends through S80, and if the determination is NO, the process proceeds to S81 through S78. S8
At 0, "multi-channel" is selected as the input mode. As a result, the switches SW11 and SW12 are turned off, the switches SW13 to SW18 are turned on, the switches SW21 to SW26 are turned off, and the switch SW3 is turned off.
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ã¹ãã¼ã«ãããªã¼ãã£ãªãåºåããããIn S81, it is determined whether the surround mode is on or not. If the determination is NO, the program is terminated through S82, and if YES, the program is terminated through S83.
The program ends. In S82, the switch SW2
3- Turn off SW26. Thus, audio is output only from the front left and right speakers. In S83, the switches SW23 to SW26 are turned on. Thus, audio is output from all speakers.
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ã¢ã¼ããæå®ï¼ãªã³ï¼ã§ããããã«ãªã£ã¦ãããAs described above, the speaker connected to the AV receiver 40 is inspected, and the DVD player 4
1 and detects an input audio signal from a digital or an analog (2c) according to the type of the input audio signal.
h) Or, if multi-channel is selected and digital or analog (2ch) is selected,
Regardless of whether or not speakers are connected to the speaker output terminals 61c to 61f, when the surround mode is on, an amplified audio signal is output from the 6ch amplifier circuit 59 to all of the speaker output terminals 61a to 61f (S8).
1 â S83), when the surround mode is off, the 6ch amplifier circuit 59 is supplied only to the speaker output terminals 61a and 61b.
Outputs an amplified audio signal (S81 â S8).
3). When a multi-channel is selected and speakers are connected to the speaker output terminals 61c to 61f, 6c is connected to all of the speaker output terminals 61a to 61f.
The amplified audio signal is output from the h amplifier circuit 59 (S77 â S78 â S80). When the multi-channel is selected and no speakers are connected to the speaker output terminals 61c to 61f, when the surround mode is on, 6 channels are connected to all of the speaker output terminals 61a to 61f.
An amplified audio signal is output from the amplifier circuit 59 (S
79 â S78 â S81 â S83), when the surround mode is off, only the speaker output terminals 61a and 61b are connected.
The amplified audio signal is output from the channel amplifier circuit 59 (S79 â S78 â S81 â S82). Note that this A
In the V receiver 40, S79NO â S78 â S81YE
As can be seen from the route from S to S83, in reality, the surround mode can be designated (turned on) even when the center speaker, the rear left and right speakers, and the surround speakers of the subwoofer are not connected.
ãå³ï¼ãAVã·ã¹ãã ã®ä¸»è¦é¨æ§æãä¸é¨éè¤ãã¤ã¤å
å²ãã¦ç¤ºã䏿¹ã®é¨åå³ã§ãããFIG. 1 is one partial diagram showing a main part configuration of an AV system, which is divided and partially overlapped.
ãå³ï¼ãAVã·ã¹ãã ã®ä¸»è¦é¨æ§æãä¸é¨éè¤ãã¤ã¤å
å²ãã¦ç¤ºã仿¹ã®é¨åå³ã§ãããFIG. 2 is another partial diagram showing a main part configuration of the AV system in a partially overlapped manner.
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ãããFIG. 3 shows an analog 2c executed in the AV receiver.
It is one partial figure which divided | segmented the flowchart of h switching processing.
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ãããFIG. 4 shows an analog 2c executed in the AV receiver.
It is the other partial figure which divided | segmented the flowchart of h switching processing.
ï¼ï¼ AVã¬ã·ã¼ãï¼ã¢ã³ãè£ ç½®ï¼ ï¼ï¼ DVDãã¬ã¼ã¤ï¼ãªã¼ãã£ãªã½ã¼ã¹ï¼ ï¼ï¼ ãã£ã¸ã¿ã«ãªã¼ãã£ãªä¿¡å·å ¥å端å ï¼ï¼ï½ãï¼ï¼ï½ ã¢ããã°ãªã¼ãã£ãªä¿¡å·å ¥å端å ï¼ï¼ DSP ï¼ï¼ ï¼ï½ï½ã¢ã³ãåè·¯ï¼ã¢ã³ãåè·¯ï¼ ï¼ï¼ï½ãï¼ï¼ï½ ã¹ãã¼ã«åºå端å Reference Signs List 40 AV receiver (amplifier device) 41 DVD player (audio source) 43 Digital audio signal input terminal 44a to 44f Analog audio signal input terminal 57 DSP 59 6ch amplifier circuit (amplifier circuit) 61a to 61f Speaker output terminal
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