CN1227950C - Centralizing of spatially expanded sterophonic audio image - Google Patents

Centralizing of spatially expanded sterophonic audio image Download PDF

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Publication number
CN1227950C
CN1227950C CNB008075379A CN00807537A CN1227950C CN 1227950 C CN1227950 C CN 1227950C CN B008075379 A CNB008075379 A CN B008075379A CN 00807537 A CN00807537 A CN 00807537A CN 1227950 C CN1227950 C CN 1227950C
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China
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signal
sound system
signal level
sound
increase
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Expired - Lifetime
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CNB008075379A
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CN1364393A (en
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小罗伯特·E·莫里斯
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Thomson Licensing SAS
International Digital Madison Patent Holding SAS
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Thomson Licensing SAS
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S1/00Two-channel systems
    • H04S1/002Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S1/00Two-channel systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/04Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S7/00Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30Control circuits for electronic adaptation of the sound field

Abstract

In a stereophonic system having sum and difference signals with expanded spatial imaging, localization of center audio materials more towards the center is accomplished by equlization of the (L+R) sum signal. The equalization comprises decreasing the bass response while increasing the treble response of the sum signal with the desired bass reduction being accomplished by the use of a gyrator to economically synthesize an inductance. Additionally, the equalizations in the (L+R) sum signal to reduce the signal at bass frequencies and to increase the signal at treble frequencies are switchable singly or in combination between 'ON' and 'OFF' modes.

Description

Stereo component system
The application requires the priority of the U.S. Provisional Application 60/134,005 of submission on May 13rd, 1999.
Background technology
Stereo enhancing sound system is typically handled and (L+R) signal component and poor (L-R) signal component, if take other modes not obtain, they can be from an a pair of left side (L) signal and the generation of the right side (R) signal.When difference signal reproduced by a pair of left and right sides loud speaker or an ambiophonic system, it can be used to set up the stereo image of a spatial spread.
The level of difference signal can be enlarged such audiovideo that perceives with respect to increasing with signal.This processing to difference signal comprises the equilibrium that is made of bass and high pitch enhancing.Yet the increase of difference signal level may produce undesirable effect to the perception of sound to the people.For example, the enhancing to the difference signal of the audio frequency of middle scope may cause a kind of for audience's perception of sound desirably responsive with respect to the physical location of left and right sides loud speaker.And the spatial spread stereo-picture can suitably not located the sound that normally sends from the center, as a people's visually being positioned at the center that TV or live image program show speech.This situation is whether to comprise a central loudspeakers or the situation of a left side and right loud speaker only about audio system.
Have been found that, one increased with respect to (L+R) and signal (L-R) difference signal level with the system that produces a spatial spread stereo image in, (L+R) and the bass response of signal reduce with (L+R) and the increase of the treble response of signal help the audience better to centralized positioning center acoustical material.
Summary of the invention
For consumer products, be necessary to make cost to keep lower.This recognize for help the audience more in the acoustical material sound system of centralized positioning center the bass of desired (L+R) and signal reduce can by use a circulator economically combination inductance realize.The inductance of a circulator generation combines with the impedance phase in (L+R) and the signal path, so a kind of bass frequencies response that reduces is provided economically, avoided the defective of wire-wound inductance simultaneously, this inductance price is more expensive, volume is bigger and have buzz and be subjected to the influence of other external electromagnetism/electrostatic noises and signal.Therefore, the not only more economical material benefit of inductance that circulator is synthetic, and can be used for the low-signal levels part of sound system.
In addition, for the signal that reduces bass frequencies with increase (L+R) that the signal of treble frequency carries out and the equilibrium of signal can be changed and/or regulate separately or in combination separately or in combination between " leading to " and " breaking " pattern.This convertible/regulating power makes it possible to the response of Adjustment System more neatly to reach audience's satisfaction.
Description of drawings
Accompanying drawing is described now, wherein:
Fig. 1 illustrates the desired frequency response of (L+R) and signal, is used to provide the centralized positioning effect for the expectation of center acoustical material.
Fig. 2 illustrates equilibrium and (L-R) the balanced block diagram of the expansion of the spatial image in the difference signal path in (L+R) and the signal path.
The block diagram of the equilibrium in Fig. 3 illustrates among Fig. 2 to be provided (L+R) and the signal path.
Fig. 4 illustrates the conversion of bass and the high pitch equalizing circuit of Fig. 3.
Fig. 5 illustrates an alternate embodiment of the conversion of Fig. 4.
The preferred embodiment explanation
Referring to accompanying drawing, wherein identical member has been given identical Digital ID, and Fig. 1 illustrates the nominal curve of the desired frequency response 10 of (L+R) and signal, is used to provide the centralized positioning effect for the expectation of center acoustical material.This frequency response illustrates the varying level that begins the bass response that reduces between the dotted line of minimum bass 12 and the highest bass 14 from 580Hz, and minimum response has the bass response of the raising of 1dB gain at the 100Hz place between 250 to 300Hz.The raising of nominal treble response is from 580Hz, at the minimum high pitch 16 that is shown in dotted line with in the limited field of high pitch 18, reaches about 2 000Hz or higher the highest about 4dB gain.
Fig. 2 illustrates current balanced 20 in (L+R) and signal path and (L-R) expansion of the spatial image in the difference signal path balanced 22 with the block diagram form.It is known in the art using the spatial image expansion balanced 22 of (L-R) difference signal.
Fig. 2 illustrates from L and R signal and forms (L+R) and (L-R) signal, but needn't be like this for the FM or the television stereo program of the U.S., is (L+R) and (L-R) form at this detected signal, need be decoded with L and the R signal that separation is provided by matrix.Therefore, the situation that matrix conversion encoder/decoder 24/26 all needing when (L+R) and signal and (L-R) difference signal to be used for Code And Decode is shown here.
Fig. 3 illustrates the equilibrium that provides among Fig. 2 in (L+R) and the signal path to help the audience more to the square frame 20 of centralized positioning center acoustical material.LC network 30 is the voltage dividers that have resistance 32, has realized the bass frequencies response of Fig. 1 effectively.The circulator inductance 34 of simulation has reduced the impedance of low frequency, and the bass response that has therefore reduced to utilize voltage divider resistance 32 is up to the response that receives and improve low frequency with the impedance of inductance 34 series capacitors 36.This voltage divider can be placed in the input of operational amplifier level 38, and its buffering signals also makes the use feedback loop provide high frequency to promote around the simple series connection RC network of operational amplifier 40, as shown in Figure 1.
More specifically, circulator 34 comprises a general purpose transistor 42, and its emitter is by resistance 44 ground connection, and base stage is by resistance 46 biasings.The electric capacity 48 of linking base stage with one almost the feedback resistance 50 in the emitter follower amplifier configuration of unit gain combine, the circulator simulation effective inductance of about 1.5 Henry is provided.Also have other circuit arrangement to be used to provide a circulator circuit, many in them can be used to herein.Circulator 34 configurations as shown in the figure only are schematically, its selected action required of using minimum component costs that provides.
Electric capacity 36 is connected circulator 34 with resistance 32 and the impedance that is provided at the increase of low frequency reaches the gain at the 1dB of 100Hz with the gain that increases bass frequencies, as mentioned above.The bias voltage that provides by resistance 46 makes transistor be operated in the range of linearity.
High pass filter 38 comprises the RC network of being made up of electric capacity and resistance 54,56 of the operational amplifier 40 that has the feedback resistance 52 that is connected with negative terminal and a series connection, and this RC network is connected to a bias generator from negative terminal, and this bias generator also provides AC ground connection.For the frequency that rises, the impedance of electric capacity 54 descends and feedback reduces, and has therefore increased the gain of operational amplifier 40.This bias voltage is conditioned so that operational amplifier 40 is operated in the range of linearity.
Fig. 4 illustrates the conversion of bass and the high pitch equalizing circuit of Fig. 3.Balanced part can be transformed into " leading to " or " breaking " pattern separately or in combination.This makes it possible to the response of Adjustment System more neatly so that the audience is satisfied.
This conversion can respond each control signal that the microprocessor (not shown) provides and be provided, the device of this conversion by buying on the market, wait and realize as relay, bipolar transistor, MOS/CMOS FET (metal-oxide semiconductor (MOS)/complementary metal oxide semiconductor field effect transistor), they can be the assembly that separates or, if suitable, provide with the form of monolithic integrated circuit.Control signal is applied to each transistor so that corresponding circulator or treble boosting circuit transistor 60,62 separately is saturated or be cut off.In addition, be applied to the control signal of transistor 60 and 62 and the bias voltage that transistor 58 provides, each can be adjusted, and can adjust within the scope of the needed control signal of conversioning transistor between " leading to " and " breaking " for transistor 60,62.
Fig. 5 illustrates an alternate embodiment of the conversion equipment of Fig. 4, wherein the switch of circulator 34 and LC network 30 and ground break away from and are illustrated as responding the regular tap 64 of an independent control signal, and circuit of high pass filter 38 is illustrated as being switched by the regular tap 64 of the independent control signal of response.
Exemplary value at the element shown in each figure is: resistance 32=3.3 kilo-ohm, and electric capacity 36=0.22 microfarad, resistance 46=68 kilo-ohm, resistance 44=1 kilo-ohm, resistance 50=2.2 kilo-ohm, resistance 52/56=15 kilo-ohm, electric capacity 54=0.01 microfarad.Transistor 42,58,60 and 62 can be non-minimum detectable signal type, and as 2N2222, operational amplifier 40 is non-critical general purpose MC3404 operational amplifiers.

Claims (18)

1. stereo component system comprises:
Provide and the device of signal (L+R) and difference signal (L-R) and signal path separately;
Be provided at the device of the stereo sound effect of a spatial spread in the difference signal (L-R); With
Be used for handling and signal (L+R) focuses on the device of the center part between a more close left side and the right loud speaker that pronounces with the above the fold with center sound, this processing unit comprises:
Be used to reduce bass frequencies signal level device and
Be used to increase the device of the signal level of treble frequency,
The device that is used to reduce the bass frequencies signal level comprises circulator.
2. sound system as claimed in claim 1, wherein circulator with and signal (L+R) path in parallel.
3. sound system as claimed in claim 1, the device that wherein is used to increase the signal level of treble frequency comprise a high pass filter with and signal (L+R) path connect.
4. sound system as claimed in claim 1, wherein bass signal reduces to comprise the frequency of 100Hz in the 580Hz wave band.
5. sound system as claimed in claim 1, wherein the increase of high pitched signal comprises the frequency that 580Hz is above.
6. sound system as claimed in claim 1, wherein the bass frequencies signal level reduce and the increase of treble frequency signal level can be between " leading to " and " breaking " pattern separately or conversion in combination.
7. sound system as claimed in claim 6, wherein transition response is in control signal.
8. sound system as claimed in claim 7, wherein control signal is provided by microprocessor.
9. stereo component system comprises:
Provide and the device of signal (L+R) and difference signal (L-R) and signal path separately;
Be provided at the device of the stereo sound effect of a spatial spread in the difference signal (L-R); With
Be used for handling and signal (L+R) focuses on the device of the center part between a more close left side and the right loud speaker that pronounces with the above the fold with center sound, this processing unit comprises:
Be used to reduce bass frequencies signal level device and
Be used to increase the device of the signal level of treble frequency,
The device that is used to reduce the device of bass frequencies signal level and increase the treble frequency signal level can be changed separately or in combination between " leading to " and " breaking " pattern.
10. sound system as claimed in claim 9, wherein transition response is in control signal.
11. sound system as claimed in claim 10, wherein control signal is provided by microprocessor.
12. a stereo component system comprises:
Provide and the device of signal (L+R) and difference signal (L-R) and signal path separately;
Be provided at the device of the stereo sound effect of a spatial spread in the difference signal (L-R); With
Be used for handling and signal (L+R) focuses on the device of the center part between a more close left side and the right loud speaker that pronounces with the above the fold with center sound, this processing unit comprises:
Be used to reduce bass frequencies signal level device and
Be used to increase the device of the signal level of treble frequency,
The device that is used to reduce the bass frequencies signal level comprises circulator,
The bass frequencies signal level reduces and the treble frequency signal level increases and can change separately or in combination between " leading to " and " breaking " pattern.
13. sound system as claimed in claim 12, wherein circulator with and signal (L+R) path in parallel.
14. sound system as claimed in claim 12, the device that wherein is used to increase the signal level of treble frequency comprise a high pass filter with and signal (L+R) path connect.
15. sound system as claimed in claim 12, wherein bass signal reduces to comprise the frequency of 100Hz in the 580Hz wave band.
16. sound system as claimed in claim 12, wherein the increase of high pitched signal comprises the frequency that 580Hz is above.
17. sound system as claimed in claim 12, wherein transition response is in control signal.
18. sound system as claimed in claim 17, wherein control signal is provided by microprocessor.
CNB008075379A 1999-05-13 2000-05-12 Centralizing of spatially expanded sterophonic audio image Expired - Lifetime CN1227950C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13400599P 1999-05-13 1999-05-13
US60/134,005 1999-05-13

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CN1227950C true CN1227950C (en) 2005-11-16

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JP (1) JP4868647B2 (en)
KR (1) KR100699454B1 (en)
CN (1) CN1227950C (en)
AU (1) AU5008100A (en)
DE (1) DE60013807T2 (en)
MX (1) MXPA01011426A (en)
WO (1) WO2000070913A2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100520948C (en) * 2003-03-03 2009-07-29 三星电子株式会社 Method for managing defect of recording media
US7675829B2 (en) 2004-06-23 2010-03-09 Lg Electronics Inc. Method and apparatus for overwriting data on recording-medium and the recording medium
US7675828B2 (en) 2003-02-25 2010-03-09 Lg Electronics Inc. Recording medium having data structure for managing at least a data area of the recording medium and recording and reproducing methods and apparatuses
US7742372B2 (en) 2005-11-25 2010-06-22 Lg Electronics, Inc. Recording medium, and method and apparatus for recording defect management information on the recording medium
US7765233B2 (en) 2004-03-19 2010-07-27 Lg Electronics, Inc. Data structure recorded in a recording medium data recording method and data recording apparatus
US7849358B2 (en) 2004-09-14 2010-12-07 Lg Electronics Inc. Recording medium, and method and apparatus of recording and reproducing data on the same
US7903513B2 (en) 2005-12-02 2011-03-08 Lg Electronics Inc. Method and apparatus for closing a recording range on a recording medium
US7969841B2 (en) 2004-06-08 2011-06-28 Lg Electronics, Inc. Method and apparatus for recording management information medium and the recording medium
US8149664B2 (en) 2004-03-19 2012-04-03 Lg Electronics Inc. Method and apparatus for recording data on write-once recording medium
US8223607B2 (en) 2003-07-04 2012-07-17 Lg Electronics Inc. Method and apparatus for managing a overwrite recording on optical disc write once
US8341456B2 (en) 2004-08-16 2012-12-25 Lg Electronics, Inc. Method and apparatus of recording data on write-once recording medium

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GB2419265B (en) 2004-10-18 2009-03-11 Wolfson Ltd Improved audio processing

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US4451927A (en) * 1982-03-24 1984-05-29 Harris Corporation Separation correction method and apparatus for plural channel transmission system
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US5692050A (en) * 1995-06-15 1997-11-25 Binaura Corporation Method and apparatus for spatially enhancing stereo and monophonic signals
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7675828B2 (en) 2003-02-25 2010-03-09 Lg Electronics Inc. Recording medium having data structure for managing at least a data area of the recording medium and recording and reproducing methods and apparatuses
CN100520948C (en) * 2003-03-03 2009-07-29 三星电子株式会社 Method for managing defect of recording media
US8223607B2 (en) 2003-07-04 2012-07-17 Lg Electronics Inc. Method and apparatus for managing a overwrite recording on optical disc write once
US7765233B2 (en) 2004-03-19 2010-07-27 Lg Electronics, Inc. Data structure recorded in a recording medium data recording method and data recording apparatus
US8149664B2 (en) 2004-03-19 2012-04-03 Lg Electronics Inc. Method and apparatus for recording data on write-once recording medium
US7969841B2 (en) 2004-06-08 2011-06-28 Lg Electronics, Inc. Method and apparatus for recording management information medium and the recording medium
US7675829B2 (en) 2004-06-23 2010-03-09 Lg Electronics Inc. Method and apparatus for overwriting data on recording-medium and the recording medium
US7936648B2 (en) 2004-06-23 2011-05-03 Lg Electronics Inc. Method and apparatus for overwriting data on recording-medium and the recording medium
US8341456B2 (en) 2004-08-16 2012-12-25 Lg Electronics, Inc. Method and apparatus of recording data on write-once recording medium
US7849358B2 (en) 2004-09-14 2010-12-07 Lg Electronics Inc. Recording medium, and method and apparatus of recording and reproducing data on the same
US7742372B2 (en) 2005-11-25 2010-06-22 Lg Electronics, Inc. Recording medium, and method and apparatus for recording defect management information on the recording medium
US7903513B2 (en) 2005-12-02 2011-03-08 Lg Electronics Inc. Method and apparatus for closing a recording range on a recording medium

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Publication number Publication date
KR100699454B1 (en) 2007-03-27
EP1177707A2 (en) 2002-02-06
DE60013807T2 (en) 2005-04-14
DE60013807D1 (en) 2004-10-21
WO2000070913A9 (en) 2002-04-18
JP4868647B2 (en) 2012-02-01
CN1364393A (en) 2002-08-14
JP2003500916A (en) 2003-01-07
AU5008100A (en) 2000-12-05
KR20010110799A (en) 2001-12-13
EP1177707B1 (en) 2004-09-15
WO2000070913A3 (en) 2001-08-16
MXPA01011426A (en) 2002-06-04
WO2000070913A2 (en) 2000-11-23

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