JP2002112382A - Sound reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound reproducing device that can obtain an optimum sound field effect corresponding to the connection between a multi-channel headphone and a 2-channel headphone. SOLUTION: The sound reproducing device is provided with signal processing means 5-8 that process a signal corresponding to a multi-channel sound source to provide an output of a multi-channel or 2-channel sound reproduction signal, a multi-channel amplifier 9 that amplifies the multi-channel sound reproduction signal, a 1st output connection means 10 that is connected to its output, a 2- channel amplifier 11 that amplifies the 2-channel sound reproduction signal, a 2nd output connection means 12 that is connected to its output, and a control means 13 that controls the signal processing means. The control means 13 detects it when the multi-channel headphone 2 is connected, detects it when the 2-channel headphone 3 is connected, and selectively controls the state of the reproduction signal of the signal processing means corresponding to each connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing apparatus having a function of reproducing a multi-channel sound reproduction signal and capable of connecting a multi-channel headphone and a two-channel headphone.

[0002]

2. Description of the Related Art In recent years, DVDs (VIDEO, AUDI,
O) and other playback devices, Dolby AC-3 and DT
Multi-channel audio signals represented by a voice coding scheme such as S have come to be handled. To play this multi-channel audio signal,
A plurality of speakers are used in front of and behind the viewer (one speaker is used for each channel signal).

For example, when reproducing 5.1 channel audio signals such as Dolby AC-3 and DTS through speakers, six speakers are required.

[0004] However, not all viewers can have six speakers (including an amplifier for driving the speakers) for reasons such as housing conditions. Usually C
Conventional audio devices such as D are based on left and right two-channel signals, so that at least two speakers can be used by most viewers. However, the desired sound field effect cannot be obtained even if the multi-channel signal is directly reproduced by the two speakers.

For example, when enjoying a DVD at midnight,
It is also conceivable that the speaker cannot reproduce at a high volume for reasons such as annoying neighbors. In this case, the problem of volume can be solved by using headphones, but a multichannel signal must be reproduced by two speakers on the left and right of the headphones, and the desired effect cannot be obtained. Further, there is a problem of localization of a sound image in the head, which is peculiar to headphones.

Accordingly, various sound reproducing devices having a signal processing device for reproducing multi-channel audio signals such as Dolby AC-3 and DTS with two speakers or two-channel headphones have been proposed.

[0007] There has also been proposed a configuration in which a multi-channel headphone having a structure in which left and right speakers of a headphone are provided at the front and rear is used for reproduction.

[0008]

In such a sound reproducing apparatus, in order to obtain an optimum sound field effect by using headphones, a sound signal of a multi-channel sound source is localized in a sound image outside the head. Thus, it is required that the signal can be processed so that the signal can be reproduced by a multi-channel headphone having a structure in which left and right speakers of the headphone are provided in front and behind, or by a normal two-channel headphone.

It is an object of the present invention to provide a sound reproducing apparatus which can respond to such a demand and can obtain an optimum sound field effect using both multi-channel headphones and two-channel headphones. .

[0010]

According to a first aspect of the present invention, there is provided a sound reproducing apparatus comprising a multi-channel headphone and a two-channel headphone which can be connected to each other. Signal processing means for processing a reproduction signal corresponding to a sound source of a channel to output a multi-channel or two-channel sound reproduction signal, and a multi-channel amplifying the multi-channel sound reproduction signal output from the signal processing means An amplifier, first output connection means connected to the output of the multi-channel amplifier, a two-channel amplifier for amplifying a two-channel sound reproduction signal, and a second output connection connected to the output of the two-channel amplifier Means, and control means for controlling the signal processing means, wherein the control means comprises a multi-channel head. When a headphone is connected to the first output connection means, this is detected, and when a two-channel headphone is connected to the second output connection means, this is detected. It is configured to selectively control the reproduction signal state of the signal processing means.

[0011] With this configuration, it is possible to obtain an optimal sound field effect as a reproduction state corresponding to the acoustic characteristics of each headphone, corresponding to the connection between the multi-channel headphone and the two-channel headphone.

The invention described in claim 2 is the first invention.
, The control means is configured to be capable of sound image localization control so that a sound image is localized at a position distant when listening to a multi-channel sound reproduction signal from the signal processing means using headphones. By setting the reproduction signal to the sound image localization control state, the sound field effect can be further enhanced by controlling the sound image to be localized at a position outside of the head while reproducing with headphones.

[0013] Further, the invention according to claim 3 is based on claim 2.
In the above, in the state where the sound image localization control is on, when the connection of the first output connection means is detected, the signal processing means converts the signal processing means into a sound image localization control coefficient adapted to the characteristics of the multi-channel headphones. Control to become
The controlled sound reproduction signal is output through a multi-channel amplifier, and when the connection of the second output connection means is detected, the signal processing means controls the sound image localization control coefficient adapted to the characteristics of the two-channel headphones. , And outputs the controlled sound reproduction signal via a two-channel amplifier, and outputs a sound reproduction signal corresponding to the connection state of each headphone. The sound image localization can be controlled irrespective of the two channels, and the sound image localization control can be performed in accordance with the characteristics of each connected headphone.

According to a fourth aspect of the present invention, when the control means detects the connection of both the first output connection means and the second output connection means in the sound image localization control state, Controlling the signal processing means to have a sound image localization control coefficient adapted to the characteristics of the multi-channel headphones, outputting the controlled sound reproduction signal to the first output connection means via a multi-channel amplifier, To the second output connection means, among the multi-channel sound reproduction signals, the sound reproduction signals of the channels whose sound image localization states are output to the front left and right channel speakers are output via a two-channel amplifier. It is said that the sound field in the forward direction can be reproduced by the characteristics of the multi-channel headphones in which the sound field effect of sound image localization is particularly remarkable. It is having an effect.

According to a fifth aspect of the present invention, the control means controls the signal processing means to perform a mixdown signal processing of the input multi-channel signal when the sound image localization control is off. It is configured to perform control to convert and output a two-channel sound reproduction signal according to the sound characteristics of the two-channel headphones,
There is an effect that reproduction can be performed by a stereo sound field effect using two normal channels.

According to a sixth aspect of the present invention, the two-channel sound reproduction signal output from the signal processing means is output to front left and right channel speakers of the first output connection means. This has the same function as the fifth aspect.

According to a seventh aspect of the present invention, in the control of the signal processing means by the control means, the multi-channel sound reproduction signal output from the signal processing means is
The sound image localization control is performed so that the sound image is localized at a distant position when listening with headphones, and when the connection of only the second output connection unit is detected, the input multi-channel signal is transmitted. It is configured to perform mixdown signal processing and control to convert to and output a two-channel audio signal matched to the acoustic characteristics of the two-channel headphones, regardless of whether the sound image localization control is on or off. By simply connecting only the second output connection means, there is an effect that reproduction can be performed by a stereo sound field effect using two normal channels.

[0018] Further, according to an eighth aspect of the present invention, the control of the signal processing means by the control means includes the step of: outputting a multi-channel sound reproduction signal output from the signal processing means.
The sound image localization control is configured so that the sound image is localized at a position distant when listening with headphones, and when the connection of the first output connection means is detected, or when the first output connection means is connected to the first output connection means. If both connections of the two output connection means are detected, control is performed so that the sound image localization control coefficient matches the characteristics of the multi-channel headphones.
The initial value is set at the center of the sound image localization position. By connecting the first output connection means, the state of the sound image localization control can always be set to the predetermined center control state. Having.

According to a ninth aspect of the present invention, the signal processing means decodes a digital multi-channel audio signal so as to process a reproduced signal corresponding to a plurality of multi-channel sound sources; A / D for converting analog multi-channel audio signals to digital signals
A digital signal processor (DSP) for converting an input multi-channel audio signal into a predetermined multi-channel audio signal or a two-channel audio signal, wherein the DSP is a multi-channel headphone or a two-channel audio signal;
It is configured to change the processing of the playback signal according to the connection of the channel headphones, and can process both digital multi-channel audio signals and analog multi-channel audio signals as the sound source of the multi-channel audio signal. The signal processing can always be performed in the vicinity of the maximum calculation amount by changing the processing according to the type of the headphone by the DSP, so that when the number of input channels is small, the accuracy and effect of the signal processing can be improved. .

Further, the invention according to claim 10 is the above-mentioned D-type.
SP is a transfer function correction circuit that mainly reproduces the acoustic characteristics of direct sound components from a plurality of speakers installed at a predetermined position to the listener's ear, and a reflected sound from the plurality of speakers installed at a predetermined position to the listener's ear. A reflected sound addition circuit that mainly reproduces the acoustic characteristics of the components, an addition and subtraction circuit that adds and subtracts each signal of the multi-channel, and outputs, and a delay circuit that outputs the input surround signal component through a high-pass filter, Corresponding to the speakers of the multi-channel headphones having speakers on the left and right, respectively, front left, front right, rear left, and rear right, it is configured to be able to output the sound reproduction signal for each, especially in sound image localization control When the number of channels is small, the number of taps of each digital filter constituting the transfer function correction circuit can be increased, or the number of reflection sound addition circuits can be increased. By it is possible to increase the number of reflection sound, has the effect of sound localization effects and sound quality, a sense of distance-spread feeling can be improved.

According to an eleventh aspect of the present invention, the first output connection means and the second output connection means are each singly or plurally, or one is singular and the other is plural. In such a case, the amplifiers are connected in parallel to the respective amplifiers, and have the effect that the respective output connection means can be used in an appropriately increased number according to the usage of the sound reproducing apparatus.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram of a sound reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a connection relation of main parts thereof, and FIG. FIG. 4 is a block diagram showing a flowchart illustrating the setting of signal processing characteristics corresponding to the connection state.

In FIG. 1, reference numeral 1 denotes a sound reproducing apparatus main body, which receives a multi-channel audio signal from a sound source such as a DVD player (video or audio), and
The signal is processed, amplified, and output. 2 is a multi-channel headphone constituted by four speakers having speakers on the left and right, respectively, for example, and 3 is a speaker constituted by one speaker on the left and right 2
Channel headphones, these headphones 2 and 3
Is connected to the audio reproducing apparatus main body 1 to reproduce the output audio signal.

In the main body 1 of the sound reproducing apparatus, 4 is an input circuit for inputting digital multi-channel audio signals and analog multi-channel audio signals from a plurality of multi-channel sound sources, 5 is a decoder for decoding digital multi-channel audio signals, and 6 is a decoder. A / D converter for converting an analog multi-channel audio signal into a digital signal, 7
Is a DSP (digital signal processor) for converting an input multi-channel audio signal into a predetermined multi-channel audio signal or a two-channel audio signal, and 8 is a DSP
7 is a D / A converter for converting the digital audio signal converted by 7 into an analog audio signal. Here, the decoder 5
, The A / D converter 6, the DSP 7, and the D / A converter 8 constitute a signal processing device.

Reference numeral 9 denotes a multi-channel amplifier for amplifying the multi-channel audio signal output via the D / A converter 8, and the amplified signal is output to first output connection means 10 comprising a connector. However, in this example, the first
And two output connection means 10 are connected in parallel, so that the output of the multi-channel signal can be simultaneously connected to the two multi-channel headphones 2. 11 is D
This is a two-channel amplifier for amplifying the two-channel audio signal output via the / A converter 8, and the amplified signal is output to the second output connection means 12 comprising a jack. Here, two first output connection means 10 and one second output connection means 12 are provided. However, each of these is used alone, or a plurality of each is used, or one is used alone, and the other is used as a plurality. In the case of a plurality of amplifiers, they are connected in parallel to the outputs of the amplifiers 9 and 11.

Numeral 13 denotes a control means comprising a microcomputer, which controls the DSP 7 constituting the signal processing device, controls the switching of the sound source inputted to the input circuit 4,
The control of the multi-channel amplifier 9 and the control of the two-channel amplifier 11 are performed. 14 is a memory,
A sound image localization control coefficient or the like matched to the characteristics of the multi-channel headphone or the two-channel headphone is stored. The sound image localization control coefficient is read into the DSP 7 via the control means 13. Reference numeral 15 denotes operation means including a push button switch, a key, and the like, which perform operations such as input switching of a plurality of sound sources, switching of a sound image localization control mode, distance control of a sound image localization position, and power supply switching. Reference numeral 16 denotes a display means for displaying a switching mode, a sound level, a sound image localization state, and the like.

The multi-channel headphone 2 is composed of four speakers 2a, 2b, 2c, 2d arranged in front and rear, respectively, corresponding to the left and right sides of the head of the listener A, and the headphone cord 2e. A connector 17 is connected to the tip of the connector 10, and the connector 17 is configured to be connectable to the connector 10 described above. Therefore, the connector 17 of the multi-channel headphone 2 is connected to the connector 10
, The multi-channel audio signal output via the multi-channel amplifier 9 can be reproduced by the multi-channel headphones 2. The two-channel headphone 3 has one speaker 3a, 3b on the left and right, and a plug 18 is connected to the tip of the headphone cord 3e. The plug 18 can be connected to the jack 12 described above. are doing. Therefore,
Plug the plug 18 of the 2-channel headphones 3 into the jack 12
, The two-channel sound signal output via the two-channel amplifier 11 can be reproduced by the two-channel headphones 2.

Here, the connector 17 is connected to the connector 10 so that the connection state can be detected by the control means 13.
8 is connected to the jack 12 similarly.
3 so that it can be detected.
By detecting these connections, the connection of the multi-channel headphones 2 or the connection of the two-channel headphones 3 can be detected by the control means 13.

Next, the connection relationship shown in FIG. 2 will be described.

The DSP 7 converts the input multi-channel audio signal into a predetermined multi-channel audio signal or a two-channel audio signal. (Frequency or number of channels), and the content of the signal processing is set according to the characteristics of the connected multi-channel headphones 2 or 2-channel headphones 3. The output of the result of the signal processing by the DSP 7 is output as four audio signals of a front left audio signal FL, a front right audio signal FR, a surround left audio signal SL, and a surround right audio signal SR for multi-channel use. Left and right audio signals L and R for channel
Is output. Each audio signal output from the DSP 7 is output from the D / A converter 8 to the connector 10 and the jack 12 via the multi-channel amplifier 9 and the two-channel amplifier 11.

Here, in the multi-channel amplifier 9, the front left audio signal FL and the front right audio signal FR
Since the amplifier 10 is configured as a BTL amplifier, it has two output terminals, and has terminals for connection detection. Therefore, the connector 10 has eight terminals a to h. That is, signal FL terminals a and b, signal FR terminals c and d, signal SL terminal e, signal SR terminal f, connection detection terminal g, and ground terminal h.
Is connected to the first output connection means detection input of the control means 13. The connector 17 also has an eight-terminal configuration similarly to the connector 10, and is connected to the multi-channel headphone 2 as shown in the figure. By connecting the terminals g and h on the connector 17 side, the connector 17 is connected to the connector 10. When the connection is made, the terminal g of the connector 10 is connected to the ground terminal h, and the connection to the ground is detected by the control means. As a result, the connection of the connector 17 to the connector 10 (that is, the connection of the multi-channel headphones 2) )
Will be detected.

The signals L and R output from the DSP 7 are
Is connected from the D / A converter 8 to the terminals a and b of the jack 12 via the two-channel amplifier 11, and the terminal c of the jack 12 is connected to the second output connection means detection input of the control means 13. , Terminal d is a ground terminal. The plug 18 has three terminals of a normal stereo plug, and has signal terminals a and b connected to the terminals a and b of the jack 12 and a ground terminal c. The common terminal c and d are connected to the two-channel headphone 3 as shown, and the common terminal c on the plug 18 side connects the terminal c on the jack 12 to the ground terminal when the plug 18 is connected to the jack 12. Then, the connection to the ground is detected by the control means, and as a result, the connection of the plug 18 to the jack 12 (that is, the connection of the two-channel headphones 3) is detected.

Next, a configuration example of the DSP 7 shown in FIG. 3 will be described.

A multi-channel audio signal (subwoofer signal SWi, center signal C
i, front left signal FLi, front right signal FRi, surround left signal SLi, and surround right signal SRi)
Low-pass filter 19, transfer function correction circuit 20, reflected sound addition circuit 21, addition / subtraction circuit 22, high-pass filter 2
3. Processing is performed by the delay circuit 24. Then, a multi-channel audio signal for output to the above-described multi-channel headphone 2 (four audio signals of a front left audio signal FL, a front right audio signal FR, a surround left audio signal SL, and a surround right audio signal SR).
Are output, and the left and right audio signals L and R are output for two channels. Here, by the processing of the transfer function correcting circuit 20 and the reflected sound adding circuit 21, the localization position (distance at the position outside the head) of the sound image when reproducing with the headphones 2 and 3 is set. Are stored in the memory 14 described above.

The transfer function correction circuit 20 performs processing for mainly reproducing the acoustic characteristics of direct sound components from a plurality of speakers installed at predetermined positions to the listener's ear, and is constituted by, for example, a plurality of digital filters. The number of taps of each digital filter is adjusted according to the type of audio coding scheme, sampling frequency, or number of channels. In addition, in response to the detection of the connection of the multi-channel headphones 2 and the detection of the connection of the two-channel headphones 3, the number of taps of each digital filter is similarly adjusted according to the head-on characteristic. It is configured so as to correspond to. Here, for example, if the processing capacity as a whole is fixed, if the number of channels is reduced, the number of taps of each digital filter can be increased, and the accuracy and effect of signal processing can be improved.

The reflected sound adding circuit 21 performs processing for mainly reproducing the acoustic characteristics of the reflected sound components from a plurality of speakers installed at predetermined positions to the ears of the listener. For example, a plurality of serially connected plurality of speakers are connected. It comprises a delay unit and a level adjuster, and is configured to adjust the number of the delay units and the level adjusters according to the type of the audio coding system, the sampling frequency or the number of channels. Also,
Detection of the connection of the multi-channel headphones 2 described above,
It is configured to correspond to the detection of the connection of the two-channel headphones 3 and to adjust the characteristics in the same manner according to the characteristics of the head-on so as to correspond to the characteristics. Here, for example, if the processing capacity as a whole is constant,
If the number of channels is reduced, the number of reflected sounds can be increased, and the sound image localization effect, sound quality, and sense of distance and spread can be improved.

The addition / subtraction circuit 22 performs addition and subtraction of the signals of the six channels of 5.1 channels, which have been input and post-processed, by the transfer function correction circuit 20 and the reflected sound addition circuit 21. The front left audio signal FL and the front right audio signal FR for headphone input, which reflect the input signals, are output.

Of the input multi-channel audio signals, the surround left signal SLi and the surround right signal SRi
Is a transfer function correction circuit 2 via a low-pass filter 19.
0 is input and the signal is processed.
And through a delay circuit 24, as a surround left audio signal SL and a surround right audio signal SR. That is, as the output side surround left audio signal SL and the surround right audio signal SR, the input side surround left signal SLi and the surround right signal SRi are used.
Of these, only the high-frequency component is output, and the high-frequency component of the input signal is reflected in the front left audio signal FL and the front right audio signal FR on the output side.

The subwoofer signal SWi and the center signal C
i is reflected in the front left audio signal FL and the front right audio signal FR on the output side, and the front left audio signal FL,
According to the characteristics of the headphone to which the front right audio signal FR is input, in the case of the multi-channel headphone 2, the center channel audio signal is also reproduced by the front speakers 2a and 2b, and in the case of the two-channel headphone 3. Is similarly reproduced by the left and right speakers 3a, 3b.

With the DSP 7 configured as described above, particularly by the processing of the transfer function correction circuit 20 and the reflected sound addition circuit 21, the localization position (distance at the position outside the head) of the sound image when reproduced by the headphones 2, 3 is determined. The setting of the sound image localization, that is, the selection control of the reproduction state is performed by the control means 13.

The first of the selection control by the control means 13 is an input switching corresponding to the input multi-channel sound source, which is an output signal of a DVD player (video or audio), an output signal of a digital broadcast receiver, and the like. And the multi-channel audio coding method is AC
-3, DTS, Dolby Pro Logic, and the like. The input circuit 4 is switched by the selection operation of the operation means 17 and the signal processing of the DSP 7 is set in response to the input.

The second of the selection control is to perform on / off control of the sound image localization control mode by operating means for setting whether or not to perform the sound image localization control. The localization position (distance at the position outside the head) of the sound image at the time of reproduction by the headphones is set by the processing of the transfer function correction circuit 20 and the reflection sound adding circuit 21 in the DSP 7 described above. Is controlled so as to be a sound image localization control coefficient according to. When the sound image localization control is off, the DSP 7 performs a mixdown signal processing of the input multi-channel signal, and converts the multi-channel signal into a two-channel sound reproduction signal corresponding to the sound characteristics of the two-channel headphone 3 and outputs the signal. Perform control.

The third of the selection control is to detect the connection state of the headphones 2 and 3 when the sound image localization control is on so that the sound image localization control coefficient is adjusted to the characteristics of the multi-channel headphones 2. Control or control is performed so that the sound image localization control coefficient matches the characteristics of the two-channel headphones. The setting control is performed as follows.

That is, as shown in the flowchart of FIG. 4, first, in step S1, the connectors 10, 17
It is determined whether or not the multi-channel headphone 2 has been connected by the connection of step S2.
To determine whether or not two-channel headphones have been connected by connecting the jack 12 and the plug 18. If not connected in step S1, the process advances to step S3 to determine whether or not two-channel headphones have been connected. I do. If the connection is established in step S2, the process proceeds to step S4, where the multi-channel headphones 2 and 2
Even though both of the channel headphones 3 are connected, priority is given to performing control so that the sound image localization control coefficient matches the characteristics of the multi-channel headphones 2. If the connection is not established in step S2, the process proceeds to step S5 to control the sound image localization control coefficient to match the characteristics of the multi-channel headphones 2. Also,
If the connection has been established in step S3, the process proceeds to step S6, where control is performed so that the sound image localization control coefficient matches the characteristics of the two-channel headphones 3. Then, step S3
If the connection is not established in step S4, and after the processing in steps S4 to S6, the process returns to step S1.

In the case of the control in step S4, the reproduction by the two-channel headphone 3 is performed with the sound image localization control coefficient set in accordance with the characteristics of the multichannel headphone 2 and the multi-channel sound reproduction signal. Signals equivalent to the front left and right channel audio signals FL and FR are converted into left and right audio signals L and
Output to R.

(Embodiment 2) In the above description, the DSP 7 is turned off in response to the on / off control of the sound image localization control mode by the operating means for setting whether or not to perform the sound image localization control. It is configured to perform mixdown signal processing of the input multi-channel signal, and control to convert and output a two-channel sound reproduction signal that matches the sound characteristics of the two-channel headphones 3.

On the other hand, the sound image localization control can be performed so that the multi-channel sound reproduction signal output from the signal processing means is localized at a position where the sound image is separated when listening through headphones. In addition, the jack 12 and the plug 1 as the second output connection means
If only connection 8 is detected, regardless of the on / off state of the sound image localization control mode, the DSP 7 performs mixed-down signal processing on the input multi-channel signal and adjusts the sound to the acoustic characteristics of the 2-channel headphones. It is configured to perform control for converting the signal into a two-channel audio signal and outputting the signal. According to such an embodiment, regardless of the on / off state of the sound image localization control, the normal two-channel in-head localization reproduction can be performed only by connecting the second output connection means.

(Embodiment 3) In addition, the multi-channel sound reproduction signal output from the signal processing means is configured so that sound image localization control can be performed so that the sound image is localized at a distant position when listening through headphones. The points are the same,
When the connection of the connectors 10 and 17 as the first output connection means is detected, or when the first output connection means and the second output connection means are connected to each other.
When both connections of the output connection means are detected, the DSP 7 is controlled so that the sound image localization control coefficient is adjusted to the characteristic of the multi-channel headphone 2, and the initial value of the sound image localization control is set to the center of the sound image localization position. Is set. According to such an embodiment, the state of the sound image localization control can always be set to the predetermined central control state by connecting the first output connection means.

[0050]

As described above, according to the present invention, there is provided a sound reproducing apparatus configured to be connectable with a multi-channel headphone and a two-channel headphone, and performs processing of a reproduction signal corresponding to a multi-channel sound source. Signal processing means for outputting a multi-channel or two-channel sound reproduction signal; a multi-channel amplifier for amplifying the multi-channel sound reproduction signal output from the signal processing means; A first output connection means, a two-channel amplifier for amplifying a two-channel sound reproduction signal, a second output connection means connected to an output of the two-channel amplifier, and a control means for controlling the signal processing means. Control means, when multi-channel headphones are connected to the first output connection means, When the two-channel headphones are connected to the second output connection means, this is detected, and the reproduction signal state of the signal processing means is selectively controlled in accordance with each connection. The advantageous effect described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a sound reproducing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a connection relation of the main parts.

FIG. 3 is a block diagram showing a configuration in the DSP.

FIG. 4 is a flowchart for explaining setting of signal processing characteristics corresponding to the connection state;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sound reproduction apparatus main body 2 Multi-channel headphones 2a Front left speaker of multi-channel headphones 2b Front right speaker of multi-channel headphones 2c Rear left speaker of multi-channel headphones 2d Rear right speaker of multi-channel headphones 3 2-channel headphones 4 Input circuit 5 Decoder Reference Signs List 6 A / D converter 7 DSP (digital signal processor) 8 D / A converter 9 Multi-channel amplifier 10 First output connection means 10 11 Two-channel amplifier 12 Second output connection means 13 Control means 14 Memory 15 Operation means 16 display means 17 connector 18 plug 19 low-pass filter 20 transfer function correction circuit 21 reflected sound addition circuit 22 addition / subtraction circuit 23 high-pass filter 24 delay circuit FL front left audio signal FR Cement right audio signals SL surround left audio signal SR surround right audio signal L 2 channel for left audio signal R 2 channel for the right audio signal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Hashimoto 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5D011 AD13 5D062 AA74

Claims (11)

[Claims] An audio reproducing apparatus configured to connect a multi-channel headphone and a two-channel headphone, wherein the reproducing apparatus processes a reproduction signal corresponding to a multi-channel sound source to generate a multi-channel or two-channel audio reproduction signal. Signal processing means for outputting, a multi-channel amplifier for amplifying a multi-channel sound reproduction signal output from the signal processing means, first output connection means connected to the output of the multi-channel amplifier, A two-channel amplifier for amplifying a sound reproduction signal; second output connection means connected to an output of the two-channel amplifier; and control means for controlling the signal processing means. When connected to the first output connection means, this is detected and
When a channel headphone is connected to the second output connection means, the connection is detected and the reproduction signal state of the signal processing means is selectively controlled in accordance with each connection. apparatus. 2. The sound control apparatus according to claim 1, wherein the control means controls sound image localization so that a sound image is localized at a position distant when listening to the multi-channel sound reproduction signal output from the signal processing means using headphones. The sound reproducing device according to claim 1, wherein: 3. The sound image localization control unit according to claim 1, wherein the sound image localization control is on, and when the connection of the first output connection unit is detected, the signal processing unit adjusts the sound image localization in accordance with the characteristics of the multi-channel headphones. Controlling the signal to be a control coefficient, outputting the controlled sound reproduction signal through a multi-channel amplifier, and connecting the signal processing means to two-channel headphones when the connection of the second output connection means is detected. To control the sound image localization control coefficient in accordance with the characteristics of the above, output the controlled sound reproduction signal via a two-channel amplifier, and output the sound reproduction signal corresponding to the connection state of each headphone. 3. The sound reproducing apparatus according to claim 2, wherein: 4. In a sound image localization control state, the control means controls the signal processing means to a multi-channel headphone when connection of both the first output connection means and the second output connection means is detected. Control so that the sound image localization control coefficient is adjusted to the characteristic of the above, and outputs the controlled sound reproduction signal to the first output connection means via a multi-channel amplifier. In the multi-channel sound reproduction signal, the sound reproduction signal of the channel whose sound image localization state is output to the front left and right channel speakers is controlled through a two-channel amplifier. The sound reproduction device according to claim 2. 5. The control means, when the sound image localization control is off, controls the signal processing means to perform a mixdown signal processing of the input multi-channel signal,
3. The sound reproducing apparatus according to claim 2, wherein the sound reproducing apparatus is configured to perform a control of converting the signal into a two-channel sound reproducing signal and outputting the signal according to the sound characteristics of the channel headphones. 6. The sound reproduction signal of two channels output from the signal processing means is output to the left and right channel speakers in front of the first output connection means. Sound reproduction device. 7. The control of the signal processing means by the control means, wherein a multi-channel sound reproduction signal output from the signal processing means is localized at a position where a sound image is distant when listening through headphones. When the connection of only the second output connection means is detected, the input multi-channel signal is mixed-down processed, and the sound characteristics of the two-channel headphones are adjusted. 2. A control for converting the signal into a two-channel audio signal and outputting the converted signal.
The sound reproducing device according to claim 1. 8. The control of the signal processing means by the control means, wherein a multi-channel sound reproduction signal output from the signal processing means is localized at a position where a sound image is separated when listening through headphones. When the connection of the first output connection means is detected, or when the connection of both the first output connection means and the second output connection means is detected, the multi 2. The sound reproducing apparatus according to claim 1, wherein the sound reproducing apparatus controls the sound image localization control coefficient according to the characteristics of the channel headphones, and sets an initial value at a center of the sound image localization position. 9. The signal processing means processes a reproduced signal corresponding to a plurality of multi-channel sound sources.
A decoder for decoding digital multi-channel audio signals, an A / D converter for converting analog multi-channel audio signals to digital signals, and conversion of input multi-channel audio signals to predetermined multi-channel audio signals or two-channel audio signals 9. The sound reproduction according to claim 1, further comprising a digital signal processor (DSP) configured to change a process of a reproduction signal in accordance with connection of a multi-channel headphone or a two-channel headphone. apparatus. 10. A DSP comprising: a transfer function correction circuit for mainly reproducing acoustic characteristics of direct sound components from a plurality of speakers installed at a predetermined position to a listener's ear; A reflected sound adding circuit that mainly reproduces the acoustic characteristics of the reflected sound component up to the ear, an addition / subtraction circuit that adds and subtracts each signal of the multi-channel, and outputs the input surround signal component through a high-pass filter A delay circuit, and corresponding to a speaker of a multi-channel headphone having a speaker on each of the left and right sides, so as to be able to output respective sound reproduction signals for front left, front right, rear left, and rear right. The sound reproducing device according to claim 9, wherein 11. The first output connection means and the second output connection means are each singly or plurally, or one of them is singular and the other is plural, and in the case of plural, it is connected in parallel to each amplifier. 3. The method according to claim 1, wherein
The sound reproducing device according to any one of claims 10 to 10.