[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP1003282A2 - Circuit intégré de traitement de signaux audio - Google Patents

Circuit intégré de traitement de signaux audio Download PDF

Info

Publication number
EP1003282A2
EP1003282A2 EP99122312A EP99122312A EP1003282A2 EP 1003282 A2 EP1003282 A2 EP 1003282A2 EP 99122312 A EP99122312 A EP 99122312A EP 99122312 A EP99122312 A EP 99122312A EP 1003282 A2 EP1003282 A2 EP 1003282A2
Authority
EP
European Patent Office
Prior art keywords
output
signal
sub
output signal
integrated circuit
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.)
Withdrawn
Application number
EP99122312A
Other languages
German (de)
English (en)
Other versions
EP1003282A3 (fr
Inventor
Toru Pioneer Corporation Kageyama
Yusuke c/o Pioneer Corporation Takami
Tatsuzo c/o Pioneer Corporation Hasegawa
Kazuyuki c/o Pioneer Corporation Kudo
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
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
Application filed by Pioneer Corp filed Critical Pioneer Corp
Publication of EP1003282A2 publication Critical patent/EP1003282A2/fr
Publication of EP1003282A3 publication Critical patent/EP1003282A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the present invention relates to an integrated circuit for processing an audio signal.
  • An audio circuit for a vehicle is constructed by a circuit for creating, from an input signal, stereophonic signals to be connected to a speaker installed at the front of the vehicle (hereinafter referred to simply as “front speaker”), another speaker installed at the rear of the vehicle (hereinafter referred to simply as “rear speaker”) and a sub-woofer speaker for emphasizing a low frequency band (hereinafter referred to simply as "sub-woofer”) and for changing the sound volume and frequency characteristic of the input signal.
  • front speaker a speaker installed at the front of the vehicle
  • rear speaker another speaker installed at the rear of the vehicle
  • sub-woofer speaker for emphasizing a low frequency band
  • Fig. 2 is a block diagram of the configuration of a conventional audio circuit.
  • an input audio signal is amplified by an amplifier 10.
  • the amplified audio signal is separated in tents of frequency by a high-pass filter 11, band-pass filter 12 and a low-pass filter 13.
  • the respective frequency components are connected to the corresponding attenuators which change the frequency characteristic of the input signal.
  • the signal whose frequency characteristic has been changed is controlled in its output volume by a volume controller 17 and fader 18.
  • a front output signal and a rear output signal which are outputted to a front speaker and rear speaker, are produced.
  • a sub-woofer signal to be outputted to a sub-woofer speaker is produced from the rear output signal through a low-pass filter 19.
  • the above conventional audio circuit which is composed of individual circuit components, is expensive in production cost.
  • the filtering was carried out by means of switched capacitor filters or digital signal processing, and volume control was made in electronics.
  • the audio circuit was configured in a semiconductor integrated circuit.
  • the number of pins to connected to the integrated circuit is problematic.
  • the number of pins is prescribed for a common integrated circuit. For example, if the number of input/output pins is 44 or less, the integrated circuit with 44 pins is used. However, the number of input/output pins exceeds 44, the integrated circuit with 64 pins which is one-rank higher in the number of pins must be used.
  • the one-rank higher integrated circuit which has an increased number of pins, increases the freedom of circuit design. However, it increases a leak current from the packaged portion. This attenuates the reliability and increases the production cost. Therefore, in designing an internal circuit of the integrated circuit, how the number of input/output pins is reduced is critical.
  • An object of the present invention is to provide an integrated circuit for processing an audio signal having a reduced number of input/output pins.
  • an integrated circuit for processing an audio signal comprising: means for processing an input audio signal to create a front output signal, rear output signal and a sub-woofer output signal which are to be outputted to a front speaker, a rear speaker and a sub-woofer; and first switch means for selecting the rear output signal or the sub-woofer output signal, an output from the switch means being connected to a common output for the front speaker and the sub-woofer.
  • the integrated circuit further comprises a high-pass filter for inhibiting a low frequency band of the front output signal from passing; and second switch means for selecting an output signal from the high-pass filter or the front output signal, an output from the second switch means being connected to an output to the front speaker.
  • a high-pass filter for inhibiting a low frequency band of the front output signal from passing
  • second switch means for selecting an output signal from the high-pass filter or the front output signal, an output from the second switch means being connected to an output to the front speaker.
  • Fig. 1 is a schematic diagram of the configuration of this embodiment.
  • like reference numerals refer to like elements in Fig. 2 showing the conventional audio circuit.
  • Subscript R assigned to each reference numeral is directed to the line carrying the signal at an R (right) channel whereas subscript L assigned to each reference numeral is directed to the line carrying the signal at an L (left) channel.
  • rear output signals produced from faders 18R and 18L for the R channel and L channel are added to each other by an adder 7 to provide a monophonic signal.
  • the monophonic signal is passed through a low-pass filter (LPF) 8 to produce a low frequency signal.
  • LPF low-pass filter
  • the rear output signals from the faders 18R and 18L or the signal from the LPF 8 are selected by switches 4R and 4L, respectively.
  • the front output signals produced from faders 18R and 18L for the R channel and L channel are passed through high-pass filters (HPFs) 5R and 5L to provide high frequency signals with the lower frequency component stopped.
  • HPFs high-pass filters
  • the signals having passed through the HPFs 5R and 5L or the front output signals are selected by switches 6R and 6L, respectively.
  • the signal selected by the switch 4R or the signal selected by the switch 6R is selected by a switch 9R.
  • the signal selected by the switch 4L or the signal selected by the switch 6L is selected by a switch 9L.
  • the signal selected by the switch 6R goes to the front output terminal 3R at the R channel; the signal selected by the switches 4R and 9R goes to the rear output terminal 2R at the R channel; and the signal selected by only the switch 4R goes to a pre-output terminal 20R at the R channel. This applies to the L channel side.
  • the front output terminals 3R and 3L are connected to power amplifiers for front R-channel and front L-channel, respectively.
  • the outputs from these power amplifiers are connected to front speakers for the front R channel and front L channel, respectively.
  • the rear output terminals 2R and 2L are connected to power amplifiers for rear R-channel and front L-channel, respectively.
  • the outputs from these power amplifiers are connected to rear speakers for the rear R channel and rear L channel, respectively.
  • the switches 6R and 6L are set at the side where the front signals from the faders 18R and 18L are directly supplied, whereas the switches 4R and 4L are set at the side where the rear signals from the faders 18R and 18L are directly supplied.
  • the switches 9R and 9L are set to select the sides of the switches 4R and 4L.
  • the front signals at the R channel and L channel are guided to the front output terminals 3R and 3L, respectively so that the front power amplifiers drive the front speakers, respectively.
  • the rear signals at the R channel and L channel are guided to the rear output terminals 2R and 2L through the switches 4R, 4L and 9R, 9L, respectively so that the rear power amplifiers drive the rear speakers, respectively.
  • the switches 9R, 9L By connecting the switches 9R, 9L to the switches 6R, 6L, the front signals from the faders 18R, 18L are directly supplied so that the rear power amplifiers drive the rear speakers, respectively.
  • the signal levels supplied to the front speakers and rear speakers by the faders 18R and 18L are controlled independently or correlatively.
  • the front output terminals 3R and 3L are connected to power amplifiers for front R-channel and front L-channel, respectively.
  • the outputs from these power amplifiers are connected to speakers for the front R channel and front L channel, respectively.
  • the rear output terminals 2R and/or 2L are connected to power amplifiers for driving the sub-woofers, respectively.
  • the switches 6R, 6L are connected to the signals passed through the HPFs 5R and 5L
  • the switches 4R, 4L are connected to the LPF 8
  • the switches 9R, 9L are connected to the switches 4R, 4L, respectively.
  • the front signals at the R channel and L channel with the low frequency band suppressed are guided to the front output terminals 3R and 3L.
  • the low-frequency monophonic signals passed through the adder 7 and LPF 8 are guided to the rear output terminals 2R and 2L.
  • the power amplifiers for the sub-woofers drive the sub-woofers.
  • the low frequency band of the signals supplied to the front speakers is stopped by the HPFs 5R and 5L, the distortion of the outputs from the front speakers can be reduced.
  • the outputs from the faders 18R and 18L may be directly guided to the front output terminals 3R and 3L through the switches 6R and 6L.
  • the power amplifiers for driving the respective speakers may be integrated into a power IC.
  • the pre-output terminals may be connected to other power amplifiers for the R channel and L channel so as to drive the rear speakers.
  • the pre-output terminals 20R and 20L may be connected to an external circuit having the same configuration as the adder 7 and LPF 8, and connected to other amplifiers for the sub-woofers so as to drive the sub-woofers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic System (AREA)
  • Semiconductor Integrated Circuits (AREA)
EP99122312A 1998-11-17 1999-11-09 Circuit intégré de traitement de signaux audio Withdrawn EP1003282A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP32652798A JP3573981B2 (ja) 1998-11-17 1998-11-17 オーディオ信号処理用集積回路
JP32652798 1998-11-17

Publications (2)

Publication Number Publication Date
EP1003282A2 true EP1003282A2 (fr) 2000-05-24
EP1003282A3 EP1003282A3 (fr) 2006-05-17

Family

ID=18188836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122312A Withdrawn EP1003282A3 (fr) 1998-11-17 1999-11-09 Circuit intégré de traitement de signaux audio

Country Status (2)

Country Link
EP (1) EP1003282A3 (fr)
JP (1) JP3573981B2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3422738A1 (fr) * 2017-06-29 2019-01-02 Nxp B.V. Processeur audio pour véhicule comprenant deux modes de fonctionnement selon l'occupation de siège arrière

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4739666B2 (ja) * 2003-12-24 2011-08-03 株式会社平和 遊技制御装置
JP5244066B2 (ja) * 2009-10-13 2013-07-24 株式会社三共 遊技機
JP5244065B2 (ja) * 2009-10-13 2013-07-24 株式会社三共 遊技機
JP5362881B2 (ja) * 2012-05-25 2013-12-11 株式会社三共 遊技機
JP5362880B2 (ja) * 2012-05-25 2013-12-11 株式会社三共 遊技機
JP5485445B2 (ja) * 2013-04-04 2014-05-07 株式会社三共 遊技機
JP5723038B2 (ja) * 2014-02-18 2015-05-27 株式会社三共 遊技機

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249640A1 (fr) * 1985-11-22 1987-12-23 Sony Corporation Dispositif reproducteur stereo multicanal
US4953213A (en) * 1989-01-24 1990-08-28 Pioneer Electronic Corporation Surround mode stereophonic reproducing equipment
US5581626A (en) * 1995-07-31 1996-12-03 Harman International Industries, Inc. Automatically switched equalization circuit
EP0866638A2 (fr) * 1997-03-10 1998-09-23 Matsushita Electric Industrial Co., Ltd. Amplificateur audiovisuel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249640A1 (fr) * 1985-11-22 1987-12-23 Sony Corporation Dispositif reproducteur stereo multicanal
US4953213A (en) * 1989-01-24 1990-08-28 Pioneer Electronic Corporation Surround mode stereophonic reproducing equipment
US5581626A (en) * 1995-07-31 1996-12-03 Harman International Industries, Inc. Automatically switched equalization circuit
EP0866638A2 (fr) * 1997-03-10 1998-09-23 Matsushita Electric Industrial Co., Ltd. Amplificateur audiovisuel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3422738A1 (fr) * 2017-06-29 2019-01-02 Nxp B.V. Processeur audio pour véhicule comprenant deux modes de fonctionnement selon l'occupation de siège arrière
CN109218918A (zh) * 2017-06-29 2019-01-15 恩智浦有限公司 音频处理器
US10212531B2 (en) 2017-06-29 2019-02-19 Nxp B.V. Audio processor
CN109218918B (zh) * 2017-06-29 2022-07-15 恩智浦有限公司 音频处理器

Also Published As

Publication number Publication date
JP2000152369A (ja) 2000-05-30
EP1003282A3 (fr) 2006-05-17
JP3573981B2 (ja) 2004-10-06

Similar Documents

Publication Publication Date Title
US4408095A (en) Acoustic apparatus
EP2425636B1 (fr) Système de gestion spectrale
US5970153A (en) Stereo spatial enhancement system
CN100566458C (zh) 声信号处理方法与装置
US7251333B2 (en) Method and apparatus for creating a virtual third channel in a two-channel amplifier
US4968154A (en) 4-Channel surround sound generator
US5384855A (en) Audio system for vehicular application
EP1003282A2 (fr) Circuit intégré de traitement de signaux audio
JP2003143700A (ja) 位相調整手段を備えたオーディオシステム
EP0833545B1 (fr) Dispositif de haut-parleur
JP4326135B2 (ja) 重低音ブースト装置
KR101659626B1 (ko) 신호 믹싱 및 대역 분리를 이용하여 증폭단 채널 수를 최소화하기 위한 차량 오디오 시스템
JP3253814B2 (ja) オーディオシステム
KR20100083477A (ko) 다채널 서라운드 스피커 시스템
JPH0740760B2 (ja) 車内ステレオ音響装置
JPH06225243A (ja) 音声出力切換回路
JP2005142924A (ja) オーディオ信号増幅回路
JP2005184149A (ja) 音響再生装置
JP2002345099A (ja) スピーカ装置
EP0603970A1 (fr) Système de reproduction sonore et circuit de réglage à utiliser dans ce système
JP2003299183A (ja) 収音装置及びステレオ演算方法
KR20000005184U (ko) 오디오 채널수에 적응하는 스피커 시스템
JPH04115799A (ja) スピーカ切換え回路
JPH1098800A (ja) ステレオスピーカ装置およびアンプ装置
JPH04371100A (ja) 残響付加装置付音響装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19991109

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

RIC1 Information provided on ipc code assigned before grant

Ipc: H04R 5/04 20060101ALI20060330BHEP

Ipc: H04S 5/02 20060101ALI20060330BHEP

Ipc: H03G 3/00 20060101AFI20000222BHEP

17Q First examination report despatched

Effective date: 20060721

AKX Designation fees paid

Designated state(s): DE IT NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20080115