CN1136759C

CN1136759C - Audio signal controller and reproducing device comprising the same

Info

Publication number: CN1136759C
Application number: CNB998081752A
Authority: CN
Inventors: 中谷英次
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1998-07-24
Filing date: 1999-07-19
Publication date: 2004-01-28
Anticipated expiration: 2019-07-19
Also published as: DE19983393T1; GB2352379B; GB2352379B8; WO2000005926A1; CN1308833A; GB2352379A8; GB2352379A; GB0026959D0

Abstract

The present invention provides a sound signal controller and replayer with the controller. In order to obtain the sound of clear contours and effective sound with a spreading feeling and localizing a speech at the center of an image in the case of a stereo movie source and obtain conventional sound quality in the case of a music source, a surrounding circuit 1 and band-pass circuits 11R and 11L are serially provided in respective channels and the characteristics of both circuits 1 and 11R and 11L are linked and switched to an ON state and an OFF state by a control part 3, at the time of reproducing the stereo signals of a video source or the like, when a switch 2 is switched to the OFF state and a transistor 14R is turned OFF and a field effect transistor 4 is turned to the ON state by the control part 3, music signals are originated from speakers 10R and 10L by frequency characteristics in which a middle band is raised and the sound of the clear contour and the effective sound with the spreading feeling are obtained.

Description

Audio signal controller and replay device with this audio signal controller

Technical field

The present invention relates to sound is looked the voice signal control that the tonequality of the voice signal of equipment is controlled.

Background technology

Always, in having equipment such as visual device stereo audio equipment,, the technology of matrix form loop circuit capable expanded sound is set for outstanding telepresenc.Fig. 6 represents to possess the stereo equipment equipment of this matrix form loop circuit capable 1, if switch 2 is switched to conducting state, control part 3 just makes field-effect transistor 4 conductings, reaches the state that surrounding effect is arranged.5 and 6 is to increase or reduce the resistor of surrounding effect and separate the capacitor that direct current is used.The frequency characteristic of

amplifier

7R, 8R, 9R and the loud speaker 10R of right passage is smooth as far as possible, and the frequency characteristic of amplifier 7L, the 8L of left passage, 9L and loud speaker 10L is smooth as far as possible.

Again, have in order to make personage's lines of coming on stage clear, use center loudspeaker, the situation of the sound that the frequency band of additional and people's sound is close.Consistent with its frequency respectively bandpass filters of band region that makes bass zone and voice in the voice signal also have to be set, to use the result that its input is compared, the volume to its frequency band controls respectively, realizes and scene corresponding effects such as film source.

Also have, the DVD optic disk that recording capacity rapidly increases begins to popularize, there are many movie programs to sell, the voice data that in this DVD, writes down with video data through the sound boil down to for example the multichannel audio data of 5.1 passages of Dolby Digital formula (AC-3) write down, with its playback time, usually utilize preceding loud speaker L, R, back loud speaker L, R, central loudspeakers, inferior woofer totally 6 speaker playbacks, can listen to surround sound with image.Again, as this voice data, the same with Doby AC-3 voice data, multichannel audio data as 5.1 passages, dts (the Digital Theater Systems) voice data that is recorded in DVD is arranged, and under the situation of its playback, also the same usually carrying out with Doby-AC-3.

But in the matrix form loop circuit capable, when reception has the film etc. of scene of fighting, in a single day spread effect sound relatively the volume of lines descend, lines are difficult to catch or the acoustic image of lines is positioned with the tendency of guiding the image depths into.

Again, in the equipment of additional central loud speaker, this central loudspeakers is shifted in the location of acoustic image, and is inconsistent with the position in the generation source of sound in the image, produces discordant sensation.For example, be provided with on the casing of television set under the situation of central loudspeakers, acoustic image is located above image, and is inconsistent with image.And under the situation of this central loudspeakers, need the amplifier of central loudspeakers and this central loudspeakers of driving.

Again,, also need system that these parts are controlled, cost an arm and a leg and complicated tendency is arranged even use the equipment of bandpass filters and comparator.

And tonequality at the cinema has the tendency of overtone composition skew, different with the tonequality of music playback, therefore, collect music playback and movie playback under the situation of 1 family expenses equipment complex that carries out, exist the problem that to reproduce the atmosphere of cinema in family's playback.

And the playback of the voice data of Doby AC-3 and dts needs 6 loud speakers.

Summary of the invention

The object of the present invention is to provide stereosonic two loud speakers that use simple circuit configuration, can access clear-cut sound that cinema can access in the stereo movie source and the effect sound that the expansion sense is arranged, and realize consistently on the position with image at the centrally-located lines of image, and can access the audio signal controller of tonequality original in music source.

Another purpose of the present invention is, even the DVD that resets the multiple tracks voice data of the voice data of Doby AC-3 and dts is write down with video data is provided, 5.1 passages are mixed the minimizing passage, also can export equally under the situation of using stereosonic 2 loud speakers to export, can utilize the method that multichannel is differentiated loop circuit capable and band-pass circuit to be automatically switched to the replay device of conducting state simultaneously.

In order to realize these purposes, audio signal controller of the present invention is 2 channel sound signal control device with loop circuit capable, it is characterized in that, be provided with and switch to realize or to cancel the loop circuit capable of surrounding effect, be installed in each passage and be connected, can be in the intermediate frequency zone that makes the voice signal band region connect state and band from low frequency region to the high-frequency region frequency characteristic flat leads to the band-pass circuit that switches the dissengaged positions with the band of the gain output higher than low frequency region and high-frequency region with the prime of described loop circuit capable, and the control part that the logical state that switches on or off of band of the state of the realization of the surrounding effect of described loop circuit capable or cancellation and described band-pass circuit is switched linkedly.

Adopt the present invention, the circuit of simple structure and stereosonic two loud speakers are set in the both sides of TV Monitor, thereby can access, can access clear-cut sound that can access at the cinema and the effect sound that wide sensation is arranged for the stereo movie source, and make lines be positioned the central authorities of image, realize with image locational consistent, again, on sound source, can access audio signal controller as 2 channel stereo of in the past tonequality.

Again, audio signal controller of the present invention is 2 channel sound signal control device with loop circuit capable, it is characterized in that, be provided with and switch to realize or to cancel the loop circuit capable of surrounding effect, be installed in each passage and be connected with the prime of described loop circuit capable, can connect state with the band of the gain output lower in the intermediate frequency zone that makes the voice signal band region and the band from low frequency region to the high-frequency region frequency characteristic flat leads to the band-pass circuit that switches the dissengaged positions than low frequency region and high-frequency region, be connected in the output of described each passage, when carrying out the electroacoustic conversion, make the loud speaker of intermediate frequency zone to carry out the electroacoustic conversion than low frequency region and the high efficient of high-frequency region, and control part, described control part switches linkedly to the state of the realization of the surrounding effect of described loop circuit capable or cancellation and the logical state that switches on or off of band of described band-pass circuit, and, even the output characteristic of described loud speaker is under the high efficiency situation in the intermediate frequency zone, make that described band-pass circuit is smooth frequency synthesis characteristic under the logical state of band of low gain output, the output characteristic of described loud speaker is the state of intermediate frequency zone for high efficiency and realization surrounding effect under the logical dissengaged positions of band.

Specifically, the intermediate frequency zone of voice signal frequency band is set in the band region of 400Hz～7kHz.

Again, replay device of the present invention, has above-mentioned a certain audio signal controller, recording medium audio playback data from recording video data while recording audio data, it is characterized in that, have the playback unit of the voice data of reading from recording medium, described control part has can make described loop circuit capable and described band-pass circuit interlock, the structure of switching according to the voice data that playback unit is read from recording medium between on-state and dissengaged positions.

Again, described control part has and can make described loop circuit capable and described band-pass circuit interlock when voice data shown in judging is the multichannel audio data that has carried out the sound compression, transforms to the structure of on-state.

Again, described multichannel audio data is Dolby Digital formula (AC-3) voice data or dts voice data.

Again, the recording medium that replay device of the present invention can be reset has at least the energy recording video data to write down the DVD of multichannel audio data simultaneously, it is characterized in that, possessing judgement is the disc discrimination unit of DVD or other video discs as the video disc of recording medium, extract multichannel audio data simultaneously no matter the number of active lanes of former data from recording medium, mixing the minimizing number of active lanes is the decoder of exporting behind 2 passages, judge the judgement unit of the classification of the multichannel audio data that is extracted, can be at the state that surrounding effect is arranged and do not have the loop circuit capable that switches between the state of surrounding effect, be installed in each passage, can connect state with the band of the gain output higher in the intermediate frequency zone that makes the voice signal band region and the band from low frequency region to the high-frequency region frequency characteristic flat leads to the band-pass circuit that switches the dissengaged positions than low frequency region and high-frequency region, and make described loop circuit capable and described band-pass circuit interlock, the control part that between on-state and dissengaged positions, switches, described control part has and can judge that voice data makes described loop circuit capable and described band-pass circuit interlock when being multichannel audio data, switches to the structure of on-state.

Summary of drawings

Fig. 1 is the structure chart of the audio signal controller of the invention process form 1.

Fig. 2 is the frequency characteristic figure of the band-pass circuit of the invention process form 1.

Fig. 3 is the concept map of audio frequency characteristic of the loud speaker output of the invention process form 2.

Fig. 4 is the structure chart of the replay device of the invention process form 3.

Fig. 5 is the flow chart of the control part of the invention process form 3.

Fig. 6 is the structure chart that possesses the existing audio frequency apparatus of loop circuit capable.

Preferred forms of the present invention

According to Fig. 1～Fig. 4 each example of the present invention is illustrated below.

Being marked with identical symbol with parts that Fig. 6 of example of expression prior art has an identical effect describes.

Example 1

Fig. 1 represents the audio signal controller of the invention process form 1.Because right passage is identical with the structure of left passage, lifting right passage below is that example describes.

Prime at matrix form loop circuit capable 1 is provided with band-pass circuit 11R.This band-pass circuit 11R connects on amplifier 7R by being used for the 1st feedback circuit 12 that resistance that high band ends and capacitor constitute and by being used for the 2nd feedback circuit 13 that resistance that low-frequency range ends and capacitor constitute, bandpass characteristics switches with the conduction and cut-off of transistor 14R.

Fig. 2 represents the frequency characteristic of band-pass circuit 11R.

Under the logical cut-off state of the band that transistor 14R is ended, shown in solid line 15, expression demonstrates the flat frequency characteristic from low frequency region to the high-frequency region frequency characteristic, under the logical state of the band admittance that makes transistor 14R conducting, shown in dotted line 16, making with 1kHz is that the intermediate frequency zone at center is than the gain output with height+5dB of high frequency and low frequency region.

Specifically, under the logical state of band admittance as shown in Figure 2, compare with the situation that under the logical cut-off state of band is the flat frequency characteristic from low frequency region to the high-frequency region frequency characteristic, at 1kHz gain only raising 5dB, having from the frequency bandwidth with the gain of the flat frequency characteristic rising 3dB of logical cut-off state is lower frequency limit 400kHz, upper limiting frequency 7kHz, frequency characteristic that we can say this band-pass circuit 11R is to make the intermediate frequency zone of 400Hz～7kHz to export than low frequency region and the high gain of high-frequency region.

The conduction and cut-off of transistor 14R is carried out by the control part 3 of carrying out the on/off control that produces surrounding effect.

Control part 3 has structure as described below.

The playback mode of common music signal, in case switch 2 is in the state of disconnection, field-effect transistor 4 promptly is in cut-off state, the surrounding effect of matrix form loop circuit capable 1 also is in interrupt status, transistor 14 also is in cut-off state simultaneously, and the frequency characteristic of band-pass circuit 11R is the flat frequency characteristic shown in solid line 15.Therefore, the music signal of input amplifier 7R evenly amplifies from the low frequency region to the high-frequency region, carries out the sound equipment conversion by loud speaker 10R by original frequency characteristic.

The stereophonic signal playback time of the video system in film source etc., in case connect switch 2, field-effect transistor 4 just is in conducting state, the surrounding effect of matrix form loop circuit capable 1 occurs, transistor 14 conductings simultaneously, the frequency characteristic of band-pass circuit 11R is only exported with the gain that exceeds 5dB in the intermediate frequency zone shown in dotted line 16.Therefore, utilize band-pass circuit 11R that the high-frequency harmonic composition in the sound of blast in the scene of fighting in lines and the film and bullet is increased, the sound of the clear-cut of formation as the cinema, people's sound sounds that acoustic image is positioned the sensation in the place ahead of listening taker in left and right sides loud speaker central authorities the place ahead, interesting to listen to tonequality is arranged in the scene of fighting, simultaneously surrounding effect is arranged at matrix form loop circuit capable 1, but the acoustic image of lines location is not to be positioned on the position of depths of picture, but the acoustic image location is consistent with image, listen sound of taker wide for what preceding go out, plosive, the sensation of the acoustic fidelity of helicopter.

Like this, adopt this example, the circuit of simple structure and stereosonic two loud speakers are set in the both sides of TV Monitor, thereby can access, can access the clear-cut sound that can access at the cinema in the stereo movie source and the effect sound of wide sensation is arranged, and make lines be positioned the central authorities of image, realize with image locational consistent, under the situation of music source, can access tonequality as in the past again.

Example 2

The frequency characteristic of example 2 and example 1

loud speaker

10R, 10L and the frequency characteristic of band-

pass circuit

11R, 11L are different.Other identical with example 1.

Preferably to take high frequency band to from low frequency smooth as far as possible for the frequency characteristic of loud speaker 10R, the 10L of example 1, and the audio frequency characteristic of loud speaker 10R, the 10L of this example 2 is shown in the dotted line 17 of Fig. 3, is being that the midband at center is to carry out electricity-sound conversion than high frequency band and the high efficient of low-frequency band with 1kHz.

Can change the capacitor of the 1st, the

2nd feedback circuit

12,13 and the constant of resistor, so that the frequency characteristic of band-

pass circuit

11R, 11L is shown in the dotted line 18 of Fig. 3, be that the midband at center is with than high frequency band and the low gain output of low-frequency band with 1kHz.

Owing to take such structure, when the music signal of resetting common, utilize control part 3 to make transistor 14 conductings in advance, field-effect transistor 4 is ended.At this moment the music signal that enters amplifier 7R at midband with than low-frequency band and the low gain output of high frequency band, and loud speaker 10R audio frequency characteristic on one side is owing to carry out the sound equipment conversion with high efficiency to midband, shown in the solid line 19 of Fig. 3, is to take all smooth frequency synthesis characteristic of high frequency band to from low frequency from the frequency characteristic of the sound equipment of loud speaker 10R output.

When the stereophonic signal of series such as replay movies source visual (visual), switch 2 switched to utilize after the on-state control part 3 that transistor 14 is cut off, and making field-effect transistor be in conducting state, music signal is promptly exported from

loud speaker

10R, 10L with the frequency characteristic that midband exceeds 5dB.

By means of this, the high order harmonic component of the blast in the scene of fighting in lines and the film and the sound of bullet increases, the clear-cut sound of formation as the cinema, people's sound sounds seeming the place ahead that is positioned to be in the listener in left and right sides loud speaker central authorities the place ahead, and the sound of scene of fighting has the sense of reality very much.And the acoustic image that matrix form loop circuit capable 1 has lines of surrounding effect is not to be positioned on the position of picture depths, but have the location consistent with image, the listener who goes out before making feels wide sound field, and the sound of plosive and helicopter is more true to nature.

Utilize simple circuit configuration like this and stereosonic two loud speakers are set in the both sides of televimonitor (TVmonitor), the sound effect that can obtain such clear-cut sound that can access at the cinema in the stereo movie source and have wide sound field to feel, and the central lines location that can be implemented in image is consistent with the position of image, then can access the tonequality that always can access for music source.

Example 3

Fig. 4 and Fig. 5 represent example 3.

This Fig. 4 is the recording/displaying device with audio signal controller of example 1.At example 1, the operation of switch 2 usefulness manual methods then needn't be carried out such manual operation at this example 3.

Being marked with identical symbol with example 1 something in common is illustrated.

The device of the recording medium that this recording/displaying device shown in Figure 4 is can playback of DVD, CDs such as VIDEO-CD (calling VCD in the following text), CD-DA 20 are such.VCD and CD-DA have the CD standard of same physical structure, and the general name CD with both is illustrated below.

Laser head 22 detects from the light of recording surface reflection by the recording surface irradiation light of built-in object lens to rotating the CD 20 that drives by spindle drive motor 21, reads the information data of CD 20 records.

The detection signal of laser head 22 is amplified by RF amplifier 23, servo double identifying disk unit 24 judges that according to the signal of RF amplifier 23 output CD 20 is DVD or CD, carries out focus control, the tracking servo of laser head 22, the various controls such as main axle servo of spindle drive motor 21.

The 25th, decoder has video decoder (not shown) and tone decoder 26.Tone decoder 26 is to mix the minimizing number of active lanes under the situation of multichannel audio data at the voice data from RF amplifier 23 input, becomes L, the output of R2 channel stereo signal.

Here, described CD is judged to be under the situation of DVD at decoder 25, in order to judge the kind of the voice data that writes down with video data, the data of input tone decoder 26 are read in control part 27, differentiate the identification code of the control information of on DVD, writing down according to the information of reading in.Just the classification of the recording mode of the sound of MPEG2 voice data, Doby-AC-3 voice data, dts voice data compression is differentiated.

Utilize tone decoder 26 L that is mixed into the output of 2 passages that reduces passages, the data of each passage of R to be transfused to band-

pass circuit

11R, 11L.

For the output of tone decoder 26, band-

pass circuit

11R, 11L can be in the output of audio signal the gain of the midband band that is higher than the gain of low-frequency band and high frequency band connect state and take between the logical dissengaged positions of band of high frequency band with the output of flat frequency characteristic and switch from low frequency.

The output of band-

pass circuit

11R, 11L is transfused to matrix form loop circuit capable 1.Matrix form loop circuit capable 1 possesses the structure that can switch between the dissengaged positions of on-state that the output of band-

pass circuit

11R, 11L is exported behind the surrounding effect in addition and additional surrounding effect output.

The output of band-pass circuit 11R by matrix form loop circuit capable 1 is reset by loud speaker 10R by amplifier 9R, and the output of the band-pass circuit 11L by matrix form loop circuit capable 1 is reset by loud speaker 10L by amplifier 9L.

The optical disc judgment object information is collected in 27 pairs of servo double identifying disks of described control part unit 24, carry out the playback control that CD 20 is reset simultaneously, to decoder 25, utilize the classification of method differentiation voice data of the identification code of the control information of differentiating the DVD record from the information of reading in recited above, foundation is to the decoded mode of the differentiation setting audio data of its recording mode, utilize following control to set ON, OFF to band-

pass circuit

11R, 11L and matrix loop circuit capable 1, show described ON, OFF state at display part 28.Again, control part 27 has can implement to collect the not shown ON switch that goes out of operating portion 29 and the information of pushing of OFF switch, implements the structure of the switching of band-

pass circuit

11R, 11L and matrix form loop circuit capable 1.

Here, in case set CD 20, servo double identifying disk unit 24 just utilizes spindle drive motor 21 to make CD 20 rotations, laser head 22 is by built-in object lens irradiation light, and detect from the light of recording surface reflection, is DVD and CD according to the output of being amplified by RF amplifier 23 with the CD difference, and it differentiates the result to control part 27 outputs.

The output of RF23 is transfused to decoder 25, at CD 20 is under the situation of DVD, by tone decoder 26 data of input are read in control part 27, differentiate the identification code of the control information that DVD writes down, differentiate the classification of the recording mode that is write down with this from the information of reading in.Control part 27 is set decoded mode according to the differentiation result of this recording mode at tone decoder 26.Then, the tone decoder 26 of being set decoded mode by control part 27 mixes the minimizing number of active lanes with the output of RF amplifier 23 under multichannel situation, be decoded as the stereo sound signal of 2 passages.

The output of tone decoder 26 is transfused to each band-

pass circuit

11R, 11L, and control part 27 utilizes following control to be set under the situation of ON, and the output of tone decoder 26 is gains that the midband output gain of audio signal frequency band is higher than low-frequency band and high frequency band.In the output of the situation subaudio frequency decoder 26 that is set at OFF is that low frequency from the audio signal frequency band takes the output that high frequency band has the flat frequency characteristic to.The output of band-

pass circuit

11R, 11L is transfused to matrix form loop circuit capable 1, utilize following control to be set under the situation of ON at control part 27, to exporting behind the additional surrounding effect of the output of band-pass circuit, export and do not add surrounding effect in the next output of the situation that is set at OFF to band-

pass circuit

11R, 11L.

Fig. 5 represents the band-pass circuit 11R, the 11L that are undertaken by control part 27 and the control and treatment flow process of matrix form loop circuit capable 1.

Control part 27 is judged whether DVD of CD 20 at step S101 according to the optical disc judgment information that obtains from described servo double identifying disk unit 24.The flow process of execution in step S102～step S104 below when CD is CD.

At step S102, band-

pass circuit

11R, 11L and matrix form loop circuit capable 1 are switched to dissengaged positions, utilize display part 28 to demonstrate dissengaged positions at step S103.Detect the ON switch of whether having operated operating portion 29 at step S104, under the situation of not operation, repeat step S102 and S103.Detect under the situation of the ON switch of having operated operating portion the flow process of execution in step S105～step 107 at step S104.

At step S105, band-

pass circuit

11R, 11L and matrix form loop circuit capable 1 are switched to on-state, utilize display part 28 to demonstrate on-state at step S106.Detect the OFF switch of whether having operated operating portion 29 at step S107, under the situation of not operation, repeat step S105 and S106.Detect at step S107 under the situation of the OFF switch of having operated operating portion 29, return step S102.

On the other hand, be judged as at step S101 under the situation of DVD, the stream ID that resolves according to above-mentioned decoder 25 at step S108 judges whether AC-3 of recording mode.

The recording mode that is judged as CD 20 at step S108 is under the situation of AC-3, the flow process of execution in step 105～step S107, and band-

pass circuit

11R, 11L and matrix form loop circuit capable 1 automatically switch to on-state.

The recording mode that is judged as CD 20 at step S108 is not under the situation of AC-3, and the stream ID that resolves according to recording mode detection unit 25 at step S109 judges whether dts of recording mode.

The recording mode of judging CD 20 at step S109 is under the situation of dts, the flow process of execution in step S105～step S107, and band-

pass circuit

The recording mode of judging CD 20 at step S109 is not under the situation of dts, the flow process of execution in step S102～step S104, and band-

pass circuit

11R, 11L and matrix form loop circuit capable 1 automatically switch to dissengaged positions

Owing to adopt such structure, CD is exactly DVD, in audio data is under the situation about writing down with AC-3 or dtc, band-

pass circuit

11R, 11L and matrix form loop circuit capable 1 are connected automatically, display part 28 demonstrates ON simultaneously, by means of this,, also can access clear-cut sound and the effect sound of wide sound field sensation is arranged as the cinema although be the sound equipment output that utilizes the loud speaker of 2 passages to carry out.

Again, at disc 20 is CD-DA or VCD, or DVD, but under the situation about writing down with the recording mode of MPEG2, show OFF at display part 28, cut off matrix form loop circuit capable 1 and band-

pass circuit

11R, 11L simultaneously and can obtain the tonequality that always can access with the SoundRec information of this CD 20 of resetting.

Again, the user wishes under the situation of the ON that shows according to display part 28 or OFF change setting, and ON switch that can press operating part 29 or OFF switch are with the set condition of any change matrix form loop circuit capable 1 and band-

pass circuit

11R, 11L.

Adopt the present invention as mentioned above, at each passage loop circuit capable and band-pass circuit are set, it is connected in series in each passage, utilize control part to make the characteristic interlock of two circuit, between on-state and dissengaged positions, switch, owing to adopt such structure, simple circuit configuration and stereosonic two loud speakers are set in the both sides of televimonitor, can in the stereo movie source, obtain cinema clear-cut sound that can access and the effect sound that the expansion sense is arranged, and the central lines that can be implemented in image and positioning image be locational consistent, and can be implemented in the audio signal controller that can access 2 channel stereo of the tonequality that always just has under the situation of music source.

Again, judging that the voice data that writes down on the recording medium is under the data conditions as the multichannel audio data record of Doby AC-3 or dts, utilize and connect loop circuit capable and band-pass circuit automatically, although be the sound equipment output that utilizes the loud speaker of 2 passages to carry out, also can not carry out any operation and just realize to access such clear-cut sound that cinema obtains and the replay device that the effect sound of wide sensation is arranged.

Again, under the situation of record multichannel audio data, utilize the method that loop circuit capable and band-pass circuit are cut off automatically, can make the playback of SoundRec information obtain the tonequality that always can access.

Claims

1. audio signal controller, described device is 2 channel sound signal control device with loop circuit capable, it is characterized in that, is provided with

Can switch with realize or the loop circuit capable of cancellation surrounding effect,

Be installed in each passage and be connected with the prime of described loop circuit capable, can be in the intermediate frequency zone that makes the voice signal band region connect state with the band of the gain output higher than low frequency region and high-frequency region and the band from low frequency region to the high-frequency region frequency characteristic flat lead to the band-pass circuit that switches the dissengaged positions and

Control part switches linkedly to the realization of the surrounding effect of described loop circuit capable or the state of cancellation and the logical state that switches on or off of band of described band-pass circuit.

2. audio signal controller, described device is 2 channel sound signal control device with loop circuit capable, it is characterized in that, is provided with

Be installed in each passage and be connected with the prime of described loop circuit capable, can be in the intermediate frequency zone that makes the voice signal band region connect state with the band of the gain output lower than low frequency region and high-frequency region and the band from low frequency region to the high-frequency region frequency characteristic flat lead to the band-pass circuit that switches the dissengaged positions,

Be connected in the output of described each passage, when carrying out the electroacoustic conversion, make the loud speaker of intermediate frequency zone to carry out the electroacoustic conversion than low frequency region and the high efficient of high-frequency region, and

Control part, the realization of the surrounding effect of described loop circuit capable or the state of cancellation and the logical state that switches on or off of band of described band-pass circuit are switched linkedly, and, even the output characteristic of described loud speaker is under the high efficiency situation in the intermediate frequency zone, make that described band-pass circuit is smooth frequency synthesis characteristic under the logical state of band of low gain output, the output characteristic of described loud speaker is the state of intermediate frequency zone for high efficiency and realization surrounding effect under the logical dissengaged positions of band.

3. audio signal controller according to claim 1 and 2 is characterized in that, the intermediate frequency zone of voice signal frequency band is set in the band region of 400Hz～7kHz.

4. a replay device has the described audio signal controller of claim 1 or claim 2, and the recording medium audio playback data from recording video data while recording audio data is characterized in that,

Playback unit with voice data of reading from recording medium, described control part has can make described loop circuit capable and described band-pass circuit interlock, the structure of switching according to the voice data that playback unit is read from recording medium between on-state and dissengaged positions.

5. replay device according to claim 4, it is characterized in that, described control part has and can make described loop circuit capable and described band-pass circuit interlock when voice data shown in judging is the multichannel audio data that has carried out the sound compression, transforms to the structure of on-state.

6. replay device according to claim 5 is characterized in that, multichannel audio data is Dolby Digital formula (AC-3) voice data or dts voice data.

7. replay device, the recording medium that can reset have the DVD that can recording video data writes down multichannel audio data simultaneously at least, it is characterized in that possessing

Judgement as the video disc of recording medium be DVD or other video discs the disc discrimination unit,

Extract multichannel audio data simultaneously no matter the number of active lanes of former data from recording medium, mix reduce number of active lanes be the decoder exported behind 2 passages,

The judgement unit of the classification of the multichannel audio data that judgement is extracted,

The loop circuit capable of can be at the state that surrounding effect is arranged and not having to switch between the state of surrounding effect,

Be installed in each passage, can be in the intermediate frequency zone that makes the voice signal band region connect state with the band of the gain output higher than low frequency region and high-frequency region and the band from low frequency region to the high-frequency region frequency characteristic flat lead to the band-pass circuit that switches the dissengaged positions and

Make described loop circuit capable and described band-pass circuit interlock, the control part that between on-state and dissengaged positions, switches,

Described control part has and can judge that voice data makes described loop circuit capable and described band-pass circuit interlock when being multichannel audio data, switches to the structure of on-state.