EP1622418A1 - Systeme numerique pour optimisation de la frequence audio - Google Patents

Systeme numerique pour optimisation de la frequence audio Download PDF

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Publication number
EP1622418A1
EP1622418A1 EP04017414A EP04017414A EP1622418A1 EP 1622418 A1 EP1622418 A1 EP 1622418A1 EP 04017414 A EP04017414 A EP 04017414A EP 04017414 A EP04017414 A EP 04017414A EP 1622418 A1 EP1622418 A1 EP 1622418A1
Authority
EP
European Patent Office
Prior art keywords
signal
digital
cpu
speaker
voice box
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.)
Ceased
Application number
EP04017414A
Other languages
German (de)
English (en)
Inventor
Yueh-Hua Hsu Huang
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.)
Jazz Hipster Corp
Original Assignee
Jazz Hipster 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 Jazz Hipster Corp filed Critical Jazz Hipster Corp
Priority to EP04017414A priority Critical patent/EP1622418A1/fr
Publication of EP1622418A1 publication Critical patent/EP1622418A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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

  • This invention is about a kind of digital audio frequency optimizer.
  • a kind of digital audio frequency optimizer can output flat frequency response curve through operation mode.
  • frequency response curve must be change after change speaker essence. While design and manufacture of voice box has alteration, it's frequency response curve will follow to alter too. So, while speaker and voice box have alteration, it must redesign all of circuits. Once speaker or voice box can't do any alteration will cause frequency response curve can't adjust. This is important bottleneck on design.
  • the purpose of this invention is to provide a kind of frequency response curve of speaker and voice box can obtain at anytime. Does suitable apery adjustment previously on computer, then save data of this curve, to get digital audio frequency optimizer of the best frequency response curve.
  • Another purpose of this invention is to supply a kind of read-only memory saves with frequency response curve of speaker and voice box only must plug on board in manufacture process. Will complete digital audio frequency optimizer of altering design purpose at any time.
  • the other purpose of this invention is to provide a kind of DSP operated result transfer to serial signal through CPU. And then transmit to digital / analog signal transducer to transfer to analog signal to reduce needed load when DSP dose complicate operate. Achieve digital audio frequency optimizer with maintaining sound quality purpose progressively.
  • the last purpose of this invention is to provide a kind of previously setting digital / analog signal transducer which outputs maxima level. Preventing power amplifier generates cut distortion phenomenon cause by too large signal input. Making digital audio frequency optimizer dose not like traditional method which using multiple elements and complex circuit combine to be a compress circuit to improve cut distortion.
  • Achieving digital audio frequency optimizer of invention purposes mentioned above includes analog / digital signal transducer, CPU, digital signal processor, digital / analog signal transducer, filter / buffer, power amplifier, speaker and voice box.
  • the read-only memory can save frequency response curve of speaker and voice box.
  • the analog / digital signal transducer receive audio frequency signal. And transfer the audio frequency signal into digital signal then transmit to CPU.
  • CPU will transfer signal received into apposition signal then send signal to DSP to operate with frequency curve save on read-only memory. And then send operated result back to CPU to transfer to serial signal. Then transmit to digital / analog transducer to transduce to analog signal. Then through filter and buffer proceeding filter and power amplify by power amplifier. Then output to speaker and voice box. Making it can output flat frequency response curve.
  • digital audio frequency optimizer supplied by this invention principally includes:
  • An analog / digital signal transducer 1 it receives audio frequency analog signal 10 from acoustic. And transfer the audio frequency analog signal 10 to digital serial signal 11 then transmit to CPU 2.
  • a CPU 2 the CPU 2 is a control center, it receives digital serial signal 11 from analog / digital signal transducer 1. And after arranging the digital serial signal 11 to apposition signal 21, then transmit the signal 21 to digital signal processor 3 ( DSP ) to operate. After operating, then send back operated parameter signal to CPU 2 to transfer to digital serial signal 22, and then transmit to digital / analog signal transducer 4.
  • DSP digital signal processor 3
  • a read-only memory 5 (EEPROM ), the read-only memory 5 connects with digital signal processor 4. It save principally original frequency response curve parameters of speaker 8 and voice box 9.
  • a digital signal processor 3 ( DSP ), the digital signal processor 3 receives signals from CPU 2 and read-only memory 5. And proceed operation according signal received.
  • Frequency response curve of speaker is operation parameter.
  • parameter value of A + parameter value of B parameter value of C.
  • Signal A represents frequency response curve of speaker 8 and voice box 9.
  • Signal B equals to negative of signal A.
  • Signal C is flat frequency response curve. So, for making speaker 8 and voice box 9 can output signal C of flat curve.
  • Operating the digital signal processor 3, must distill signal A saves in read-only memory 5 to get negative signal B parameter of signal A. And after transmitting the negative signal B parameter back to CPU 2 to transfer back to digital serial signal 22 then transmit to digital / analog signal transducer 4. Transmitting in such way can reduce load when digital signal processor 3 do complex operation. Avoiding reducing transmitted speed, lead to relative decrease of sound quality at last.
  • a digital / analog signal transducer 4 receives negative signal B from CPU 2. After transferring received signal to analog signal 41, then transmit to filter /buffer to proceed filter and buffer, and then transmit to power amplifier 7 to do power amplify. At last, transmit amplified negative signal B to speaker 8 and voice box 9. Making signal A parameter plus negative signal B parameter can get signal C on frequency response curve of speaker 8 and voice box 9. The signal C will equal to " 0". Making speaker 8 and voice box 9 can output flat frequency response curve. Besides, CPU 2 will accord with operated result of digital signal processor 3 to set maximum output level of digital / analog signal transducer 4. Prevent cut distortion cause by too large signal input on power amplifier 7.
  • digital / analog signal transducer 4 obtains stereo audio frequency signal data from CPU 2. Can add left , right two sound tracks of low pass filter and high pass filter then divide by two through digital signal processor 3. Simultaneously add low pass filter. After operating this signal with another speaker parameter, then through another digital / analog signal transducer 4, such can obtain good curve output of another sound track ( heavy bass ).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP04017414A 2004-07-22 2004-07-22 Systeme numerique pour optimisation de la frequence audio Ceased EP1622418A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04017414A EP1622418A1 (fr) 2004-07-22 2004-07-22 Systeme numerique pour optimisation de la frequence audio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04017414A EP1622418A1 (fr) 2004-07-22 2004-07-22 Systeme numerique pour optimisation de la frequence audio

Publications (1)

Publication Number Publication Date
EP1622418A1 true EP1622418A1 (fr) 2006-02-01

Family

ID=34925887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04017414A Ceased EP1622418A1 (fr) 2004-07-22 2004-07-22 Systeme numerique pour optimisation de la frequence audio

Country Status (1)

Country Link
EP (1) EP1622418A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105072535A (zh) * 2015-08-05 2015-11-18 翁馨璐 一种聋哑人使用的音箱
CN114650494A (zh) * 2022-04-07 2022-06-21 广州天逸电子有限公司 Dsp音响系统及音响系统声学自动测试方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888811A (en) * 1986-08-08 1989-12-19 Yamaha Corporation Loudspeaker device
EP0377165A2 (fr) * 1989-01-06 1990-07-11 Mitsubishi Denki Kabushiki Kaisha Dispositif de commande de gain
US5588063A (en) * 1992-10-30 1996-12-24 International Business Machines Corporation Personal multimedia speaker system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888811A (en) * 1986-08-08 1989-12-19 Yamaha Corporation Loudspeaker device
EP0377165A2 (fr) * 1989-01-06 1990-07-11 Mitsubishi Denki Kabushiki Kaisha Dispositif de commande de gain
US5588063A (en) * 1992-10-30 1996-12-24 International Business Machines Corporation Personal multimedia speaker system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105072535A (zh) * 2015-08-05 2015-11-18 翁馨璐 一种聋哑人使用的音箱
CN114650494A (zh) * 2022-04-07 2022-06-21 广州天逸电子有限公司 Dsp音响系统及音响系统声学自动测试方法
CN114650494B (zh) * 2022-04-07 2022-10-14 广州天逸电子有限公司 Dsp音响系统及音响系统声学自动测试方法

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