EP0464222A1 - Dispositif de reproduction sonore - Google Patents

Dispositif de reproduction sonore Download PDF

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Publication number
EP0464222A1
EP0464222A1 EP19910902758 EP91902758A EP0464222A1 EP 0464222 A1 EP0464222 A1 EP 0464222A1 EP 19910902758 EP19910902758 EP 19910902758 EP 91902758 A EP91902758 A EP 91902758A EP 0464222 A1 EP0464222 A1 EP 0464222A1
Authority
EP
European Patent Office
Prior art keywords
noise
frequency band
filter
frequency characteristic
control switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19910902758
Other languages
German (de)
English (en)
Other versions
EP0464222B1 (fr
EP0464222A4 (en
Inventor
Atsushi Nagayoshi
Koichi Higuchi
Kazutoshi Yamaguchi
Eiichi Takakura
Masataka Saito
Fusanori I
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011455A external-priority patent/JP2745753B2/ja
Priority claimed from JP2100072A external-priority patent/JPH03297209A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0464222A1 publication Critical patent/EP0464222A1/fr
Publication of EP0464222A4 publication Critical patent/EP0464222A4/en
Application granted granted Critical
Publication of EP0464222B1 publication Critical patent/EP0464222B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Definitions

  • the present invention relates to an acoustic reproducing apparatus for performing sound reproduction and listening in noises particularly through an open-air-type head phone as in the case with a portable-type tape player, CD player or the like.
  • acoustic reproducing apparatuses using an open-air-type head phone have been found in a large number among acoustic reproducing apparatuses such as a small-sized stereo cassette tape player and portable CD player due to the more increased outdoor application in the acoustic field.
  • the above-mentioned open-air-type head phone includes a what is generally called head phone with a head band which covers the ears and an inner-type head phone loaded in the ears; but the above-mentioned acoustic reproducing apparatuses using these head phones include cassette tape players, portable CD players, radio receivers with FM stereo and apparatuses combining these apparatuses, any of which is of a small size which is convenient for carrying. Then, even in the case of outdoor listening, owing to the open-air type as mentioned above, the sound and alarm of vehicles, signal sound and the like can be listened to, and sound reproduction and listening can be performed without any danger while walking outdoors.
  • the configuration as mentioned above is an open-air-type and allows the outside voice to be heard, therefore having a problem of being affected straightly by the surrounding noise and leaking the reproduced sound from the head phone into the surroundings.
  • Fig. 11 is a graph showing a sound leakage frequency characteristic D of a conventional open-air-type head phone measured under a condition as shown in Fig. 12. This means that measurements of sound leakage are made by a sound level meter M positioned apart by 1 (about 30 cm) from an ear La in the state that a head phone H is attached to the ear La of a listener L.
  • the surrounding environment is a soundproof chamber
  • the sound level meter M uses a A-curve filter.
  • the sound leakage increases at frequencies above 1 kHz, thereby showing a sound leakage frequency characteristic Da and showing such a frequency characteristic Db that the dark noise level of the soundproof chamber is flat in the frequency band below 1kHz.
  • the sound leakage is generated largely in the high frequency band, and this becomes a problem as a cause of sound leakage in the case of listening through the above-mentioned open-air-type head phone.
  • the present invention has been achieved for the purpose of providing an acoustic reproducing apparatus which is not affected by the noise characteristic of an electric car or a motorcar as mentioned above, and suppresses sound leakage as small as possible, and thereby can perform a sound reproduction comfortable to the listener himself and to the surrounding people.
  • the acoustic reproducing apparatus of the present invention is configurated as follows:
  • the apparatus of the present invention by performing filtering operation through changing-over the control switch, intensifies the low-pitched tone part of the frequency characteristic of the reproduced output, attenuates the high-pitched tone part, and thereby the reproduced frequency characteristic is controlled in a manner to correspond to the noise frequency characteristic, thereby suppressing the effect of the noise and attenuating the sound leakage when the head phone is used to the utmost.
  • the apparatus attenuates the leakage of the voice in the sound leakage frequency band from the head phone to the outside by turning on or off the change-over switch.
  • the apparatus makes the frequency characteristic of the reproduced signal correspond to the above-mentioned noise characteristic by changing-over the control switch, and can attenuate the sound leakage from the head phone to the outside in the state that the head phone is loaded.
  • Fig. 1 is a schematic circuit block diagram of an acoustic reproducing apparatus in an embodiment of the present invention, which is a portable CD player, and shows one channel of a stereo type.
  • numeral 1 designates a CD (Compact Disk) record
  • numeral 2 designates a traversing mechanism containing an optical pickup reading a signal from the CD record 1
  • numeral 3 designates a servo driving circuit which accurately controls the traversing mechanism 2
  • numeral 4 designates a signal processing circuit for processing a signal read by the traversing mechanism 2
  • numeral 5 designates a D/A converter for converting a digital signal after signal processing by the signal processing circuit 4 into an analog signal
  • numeral 6 designates a buffer amplifier of the D/A converter 5
  • numeral 7 designates a volume control knob for controlling the amount of output of the buffer amplifier 6.
  • Numeral 8 designates a head phone driving amplifier, which not only drives a head phone but also operates as an operational amplifier of a filter 9 as described later.
  • Numeral 9 designates a filter which is inserted in the feedback circuit of the head phone driving amplifier 8, and when this filter is inserted in the feedback circuit by a control switch 10 as described later, the input/output frequency characteristics of the head phone driving amplifier 8 are varied.
  • Numeral 10 designates an On/OFF control switch of filtering operation;
  • numeral 11 designates a head phone connecting terminal whereto the output of the head phone driving amplifier 8 is connected;
  • numeral 12 designates one channel of the head phone connected to the head phone connecting terminal 11.
  • Numeral 13 designates the other channel, which is configurated with the same circuit from the buffer amplifier 6 to the head phone 12.
  • Fig. 2 is a circuit diagram showing details of the filter 9, including from the above-mentioned head phone driving amplifier 8 to the control switch 10.
  • numerals 8 and 10 designate the above-mentioned head phone driving amplifier and control switch, respectively.
  • Numeral 10a designates a filter-off-side terminal of the control switch 10; and
  • numeral 10b designates a filter-on-side terminal of the control switch 10.
  • Numerals 14 and 15 designate resistors to become gain setting elements determining input/output gains of the head phone driving amplifier 8.
  • resistors 16 and 18 and a condenser 17 operate as part of the gain setting elements of head phone driving amplifier 8 when the control switch 10 is turned to the filter-off-side terminal 10a, and operate as low-frequency-band intensifying filter elements for intensifying the low-frequency-band and becomes part of the above-mentioned filter 9 when the control switch 10 is turned to the filter-on-side terminal 10b.
  • condensers 19 and 22 and resistors 20 and 21 operate as high-frequency-band attenuating filter elements attenuating the high frequency band and similarly becomes part of the above-mentioned filter 9, only when the change-over switch 10 is turned to the filter-on-side terminal 10b.
  • Numeral 23 designates an input terminal of this circuit
  • numeral 24 designates an output terminal of the same.
  • Fig. 3 is a frequency characteristic graph showing relationships among input-output characteristics of the circuit as shown in Fig. 2 and the above-mentioned electric car noise frequency characteristic and motorcar noise frequency characteristic as shown in Fig. 10; and in the figure, numeral 25 designates an electric car noise frequency characteristic, numeral 26 designates a motorcar noise frequency characteristic, numeral 27 designates a frequency characteristic of reproduced output in off state of operation of the above-mentioned filter 9, and numeral 28 designates a frequency characteristic of reproduced output in an state of operation of the same filter 9.
  • the reproduced output shows the frequency characteristic 28 in on state of operation of the filter 9 wherein the low frequency band is intensified and the high frequency band is attenuated; and the listener is easy to listen to the low frequency band of output from the head phone 12 without being disturbed by the noise because it is intensified; and in reverse, the high frequency band part which was to listened too annoyingly is attenuated; and therefore the listener can listen to a balanced sound.
  • the apparatus can also prevent the surrounding person in an electric car or a motorcar from being annoyed by the sound leakage.
  • the electric car noise frequency characteristic 25 and the motorcar noise frequency characteristic 26 are measured in advance, and the filter 9 which attenuates the high frequency band and intensifies the low frequency band in a manner to correspond to the above-mentioned both noise frequency characteristics and the control switch 10 which changes-over the operation thereof are installed; and thereby by burning on or off the control switch 10 as shown in Fig. 3, a nicely balanced sound can be provided in the case where listening to reproduced sound in noise is necessary, and sound leakage into the surroundings when using the open-air-type head phone can be reduced.
  • Fig. 4 is a schematic circuit block diagram showing an acoustic reproducing apparatus in a second embodiment of the present invention, which is a partial modification of the first embodiment.
  • numeral 29 designates a volume adjusting knob for controlling the amount of output from the preceding stage.
  • Numeral 30 designates a head phone driving amplifier, which not only drives the head phone but also operates as an operational amplifier of the filter as described later.
  • Numeral 31 designates a first filter inserted in a feedback circuit of the head phone driving amplifier 30, which is set so as to measure the electric car noise frequency characteristic in advance and attenuate the high frequency band part and intensify the low frequency band part so as to correspond that noise frequency characteristic, and when it is inserted in the feedback circuit by a control switch 33 as described later, the input/output frequency characteristics of the head phone driving amplifier 30 are changed.
  • Numeral 32 designates a second filter inserted in the feed back circuit of the head phone driving amplifier 30, which has a characteristic different from that of the above-mentioned first filter 31, and is set so as to measure the motorcar noise frequency characteristic in advance and attenuate the high frequency band and intensify the low frequency band part so as to correspond that noise frequency characteristic; and when it is inserted in the feedback circuit by the control switch 33 as described later, the input/output frequency characteristics are changed into a characteristic different from that of the first filter.
  • Numeral 33 designates an ON/OFF control switch of filtering operation;
  • numeral 34 designates a head phone connecting terminal whereto the output of the head phone driving amplifier 30 is connected; and
  • numeral 35 designates one of channels of the head phone connected to the head phone connecting terminal 34.
  • the electric car noise frequency characteristic 25 and the motorcar noise frequency characteristic 26 are measured in advance; and the first filter 31 and the second filter 32 which attenuate the high frequency band and intensify the low frequency band and the control switch 33 changing-over the operations thereof are installed so as to correspond to the above-mentioned respective noise frequency characteristics; and by changing-over the control switch 33, a nicely balanced sound can be provided when listening to reproduced sound in noise in necessary; and the sound leakage to the surroundings when using the open-air-type head phone can be reduced.
  • the characteristics of the filters are set in a manner of being limited to the electric car noise frequency characteristic and the motorcar noise frequency characteristic; but, for example, in an environment where noise having a characteristic of a conveyance such as an aeroplane other than an electric car and a motorcar is generated, when the noise frequency characteristic of the surrounding environment is measured in advance, and a filter characteristic corresponding to that noise frequency characteristic is set, a similar effect is obtained.
  • This embodiment aims at attenuation of the sound leakage frequency band Da in Fig. 11 as described above, and intends to eliminate an unnatural feeling in listening to the high frequency band part without particularly attenuating the high frequency band having no problem of sound leakage.
  • Fig. 5 is a schematic circuit block diagram of an acoustic reproducing apparatus in the third embodiment of the present invention, which shows a stereo type of tape player.
  • numeral 41 designates magnetic heads for picking up a voice electric signal from a magnetic tape (not illustrated);
  • numeral 42 designates preamplifiers each incorporating an equalizer circuit;
  • numeral 43 designates noise reduction circuits;
  • numeral 44 designates attenuating filters installed independently in the right and left channels for the purpose of inputting output signals of the noise reduction circuits 43 and outputting then while attenuating only a specific frequency band part thereof;
  • numeral 45 designates volume knobs for receiving the output of the attenuating filters;
  • numeral 46 designates power amplifiers with low-pitched tone intensifying circuits; which contain circuit for boosting the low-pitched tone band and can drive low-impedance loads;
  • numeral 47 designates inner-type head phones; and
  • numeral 48 designates a control switch, which can change-over the attenuating filters to
  • Fig. 6 is a detailed circuit diagram showing only a channel of one side of the above-mentioned attenuating filter 44 and the control switch 48.
  • numerals 49 and 50 designate an input terminal and an output terminal of the attenuating filter 44, respectively.
  • Numeral 51 designates a semiconductor inductor configurated with one transistor, and
  • numeral 52 designates a resonance condenser connected in series to the semiconductor inductor 51 to cause series resonance.
  • numeral 53 designates a switching circuit for supplying the output of the above-mentioned control switch 48 to the above-mentioned semiconductor inductor 51.
  • the attenuating filter 44 is a notch filter which corresponds to a frequency (6 kHz) of the maximum level value of the sound leakage frequency characteristic measured in advance as shown in the above-described Fig. 11, and takes this frequency (6 kHz) as the maximum value of attenuation. Accordingly, for the series resonance circuit configurated with the semiconductor inductor 51 and the resonance condenser 52, the constants thereof are determined in a manner that the resonance frequency thereof is 6 kHz. As is obvious from Fig. 6, when the control switch 48 is in ON state, the semiconductor inductor 51 is energized and operates, and thereby the resonance circuit works, and the attenuating filter 44 works as a notch filter whose center frequency is 6 kHz.
  • Q value of the resonance circuit is made as high as possible for the purpose of almost eliminating the effect on 1 kHz part which is the center frequency of vocal sound, and of enhancing the attenuating effect at 6 kHz as high as possible.
  • 12 dB is realized as the attenuation level at 6 kHz.
  • Fig. 9 is a frequency characteristic graph based on still another embodiment.
  • This example combines the attenuating filter of the sound leakage frequency band of the above-mentioned third embodiment with the intensifying filter of only the low frequency band of the above-mentioned first or second embodiment.
  • numeral 56 designates a noise frequency characteristic which frequency-analyses the noise in an electric car; and for this characteristic, the reproduction frequency characteristic is intensified in the low frequency band part, and the sound leakage frequency band centering 6 kHz is attenuated with a sharp attenuation characteristic.
  • the apparatus can provide an ease-to-listen and more natural sound quality.
  • the apparatus can prevent the surrounding passengers in the car from being annoyed by the sound leakage.
  • the semiconductor inductor 16 in the embodiment may be a what is generally called inductor (coil) being a passive element.
  • the head phones 12 and 47 include ear-insert-type head phones which have been often used recently.
  • the noise frequency characteristic frequency-analyzing the amount of noise in an electric car is measured in advance, and there are installed the filter which attenuates the high frequency band and intensifies the low frequency band in a manner to correspond to the above-mentioned noise frequency characteristic, and also the control switch which changes-over this filtering operation; and the above-mentioned control switch is changed-over to make the frequency characteristic of the reproduction signal correspond to the above-mentioned noise frequency characteristic, and therefore the listener can listen to a nicely balanced sound suitable for the surrounding environment.
  • the attenuating filter for attenuating the sound leakage frequency and the control switch for changing-over the operation of the attenuating filter are installed, and by turning on or off the control switch the sound leakage from the head phone to the outside in the loaded state can be positively controlled; and in case where the apparatus is used in the place and where the apparatus is used in the place filled with large noise such as in a conveyance or in a crowded place, the sound leakage to the outside can be reduced as required, and therefore the apparatus not only gives the listener a sense of ease but also can prevent the surrounding people from being annoyed, and further can provide a more natural sound quality in noisy environment, thus the present invention being very effective.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Dispositif de reproduction sonore pouvant s'utiliser conjointement avec un casque d'écoute non insonorisé dans un endroit bruyant. On mesure à l'avance la bande de fréquences des sons qui échappent lorsque le casque est utilisé, et on limite l'émission des sons en commutant un filtre atténuateur de ladite bande de fréquences lors de la mise en service du casque. En outre, on mesure à l'avance les caractéristiques des fréquences sonores, on renforce une bande à basse fréquence afin qu'elle corresponde aux caractéristiques précitées, et on modifie le fonctionnement du filtre afin d'atténuer la bande à haute fréquence qui comprend la bande de fréquences des sons précitée.
EP91902758A 1990-01-19 1991-01-16 Dispositif de reproduction sonore Expired - Lifetime EP0464222B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP11455/90 1990-01-19
JP2011455A JP2745753B2 (ja) 1990-01-19 1990-01-19 音響再生装置
JP100072/90 1990-04-16
JP2100072A JPH03297209A (ja) 1990-04-16 1990-04-16 音響再生装置
PCT/JP1991/000028 WO1991011077A1 (fr) 1990-01-19 1991-01-16 Dispositif de reproduction sonore

Publications (3)

Publication Number Publication Date
EP0464222A1 true EP0464222A1 (fr) 1992-01-08
EP0464222A4 EP0464222A4 (en) 1992-11-04
EP0464222B1 EP0464222B1 (fr) 1995-11-22

Family

ID=26346879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91902758A Expired - Lifetime EP0464222B1 (fr) 1990-01-19 1991-01-16 Dispositif de reproduction sonore

Country Status (3)

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EP (1) EP0464222B1 (fr)
DE (1) DE69114772T2 (fr)
WO (1) WO1991011077A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114866639A (zh) * 2022-04-29 2022-08-05 维沃移动通信有限公司 电子设备、控制方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122663A2 (fr) * 1983-04-08 1984-10-24 Tommyca Freadman Méthode et système pour améliorer la performance d'un haut-parleur
EP0130613A2 (fr) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Circuit de réduction de bruit
JPS60223284A (ja) * 1984-03-31 1985-11-07 Fujitsu Ltd 可聴音漏れ防止回路

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5931051Y2 (ja) * 1978-03-17 1984-09-04 三洋電機株式会社 イヤホ−ンの音量自動調整回路
JPS583305A (ja) * 1981-06-29 1983-01-10 Hitachi Ltd 自動音量調節回路
JPS5991090U (ja) * 1982-12-10 1984-06-20 アイワ株式会社 オ−プンエア式ヘツドホ−ン
JPS60145714A (ja) * 1984-01-06 1985-08-01 Nissan Motor Co Ltd 車両用音響装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122663A2 (fr) * 1983-04-08 1984-10-24 Tommyca Freadman Méthode et système pour améliorer la performance d'un haut-parleur
EP0130613A2 (fr) * 1983-07-04 1985-01-09 Victor Company Of Japan, Limited Circuit de réduction de bruit
JPS60223284A (ja) * 1984-03-31 1985-11-07 Fujitsu Ltd 可聴音漏れ防止回路

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 75 (E-390)25 March 1986 & JP-A-60 223 284 ( FUJITSU ) 7 November 1985 *
See also references of WO9111077A1 *

Also Published As

Publication number Publication date
EP0464222B1 (fr) 1995-11-22
DE69114772T2 (de) 1996-04-18
DE69114772D1 (de) 1996-01-04
WO1991011077A1 (fr) 1991-07-25
EP0464222A4 (en) 1992-11-04

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