AU2006249225B2 - Audio reproduction apparatus - Google Patents

Audio reproduction apparatus Download PDF

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Publication number
AU2006249225B2
AU2006249225B2 AU2006249225A AU2006249225A AU2006249225B2 AU 2006249225 B2 AU2006249225 B2 AU 2006249225B2 AU 2006249225 A AU2006249225 A AU 2006249225A AU 2006249225 A AU2006249225 A AU 2006249225A AU 2006249225 B2 AU2006249225 B2 AU 2006249225B2
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Australia
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audio
auxiliary
amplifier
audio signals
reproduction apparatus
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AU2006249225A
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AU2006249225A1 (en
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Keng-Kuei Su
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Description

P/0011 Regulation 3.2 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Invention Title: Audio reproduction apparatus The following statement is a full description of this invention, including the best method of performing it known to me: 2 AUDIO REPRODUCTION APPARATUS The invention relates to an audio reproduction apparatus, more particularly to an audio reproduction apparatus that can ensure a stable audio signal 5 transmission, that can provide a wide audio reproduction area, and that has a relatively low cost. Figure 1 illustrates a conventional audio reproduction apparatus that includes an audio amplifier 11 having an output side 110 for outputting audio signals 10 and an output voltage, and an impedance matching network 13coupledelectricallyacross the output side110. The audio amplifier 11 includes an amplifier 111, and a transformer 112 coupled electrically to the amplifier 111 for increasing the output voltage from the audio 15 amplifier 11. The impedance matching network 13 includes a plurality of loudspeakers 131 that are coupled electrically in series or parallel to each other. The following are some of the drawbacks of the conventional audio reproduction apparatus: 20 1. For optimum power transmission, an output impedance across the output side 110 should be equal to a total impedance of the impedance matching network 13, thereby resulting in a complex impedance design for the impedance matching network 13. Furthermore, since 25 the impedance matching network 13 has so many impedance components, attenuation of frequency response of audio frequency occurs, thereby resulting in poor audio 3 reproduction quality. 2. When the number of the loudspeakers 131 in the impedance matching network 13 is increased, the output impedance across the output side 110 may not match the 5 total impedance of the impedance matching network 13, thereby resulting in a limited number of the loudspeakers 131 that can be incorporated in the impedance matching network 13. 3. When it is necessary to increase the number of 10 the loudspeakers 131 in the impedance matching network 13, another audio amplifier, which can provide higher output power, must be installed to replace the audio amplifier 11, thereby resulting in higher costs. 4. Since the impedance matching network 13 has so 15 many impedance components, any defective one of the impedance components results in distortion of the audio signals such that a stable audio signal transmission cannot be ensured. Therefore, the object of the present invention is 20 to provide an audio reproduction apparatus that can overcome the drawbacks associated with the aforesaid prior art. According to the present invention, an audio reproduction apparatus comprises: 25 a primary audio amplifier having an output side for outputting audio signals; and a plurality of auxiliary audio amplifiers coupled 4 electrically in series to the primary audio amplifier, each of the auxiliary audio amplifiers having an input side for receiving the audio signals from the primary audio amplifier, a signal current generating device 5 coupled electrically across the input side such that the audio signals pass through the signal current generating device, a current inducing device disposed adjacent to the signal current generating device for generating induced audio signals when the audio signals 10 pass through the signal current generating device, an auxiliary amplifier coupled electrically to the current inducing device for amplifying and outputting the induced audio signals generated thereby, and a loudspeaker coupled electrically to the auxiliary 15 amplifier for reproducing the induced audio signals amplified by the auxiliary amplifier. Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference 20 to the accompanying drawings, of which: Figure 1 is a schematic electrical circuit diagram of a conventional audio reproduction apparatus; Figure 2 is a fragmentary schematic electrical circuit diagram of the first preferred embodiment of 25 an audio reproduction apparatus according to this invention; Figure 3 is a schematic electrical circuit diagram 5 of an auxiliary audio amplifier of the first preferred embodiment; and Figure 4 is a fragmentary schematic electrical circuit diagram of the second preferred embodiment of 5 an audio reproduction apparatus according to this invention. Referring to Figures 2 and 3, according to the first preferred embodiment of this invention, an audio reproduction apparatus 6 is shown to include a primary 10 audio amplifier 61, and a plurality of auxiliary audio amplifiers 62. The primary audio amplifier 61 has an output side 612 for outputting audio signals. The auxiliary audio amplifiers 62 are coupled 15 electrically in series to the primary audio amplifier 61. Each of the auxiliary audio amplifiers 62 has an input side 625, a signal current generating device 624, a current inducing device, an auxiliary amplifier 622, a loudspeaker 633 and a housing 621. For each auxiliary 20 audio amplifier 62, the input side 625 receives the audio signals fromtheprimary audio amplifier 61. The signal currentgeneratingdevice 624, suchasaconductive wire, is coupled electrically across the input side 625 such that the audio signals pass through the signal current 25 generating device 624. The current inducing device is disposed adjacent to the signal current generating device 624 for generating induced audio signals when 6 the audio signals pass through the signal current generating device 624. In this embodiment, the current inducing device includes a coiled core 623 that is annular and that defines a plane with a center. The 5 signal current generating device 624 extends through the center and is perpendicular to the plane, as shown in Figure 3. The auxiliary amplifier 622 is coupled electrically to the current inducing device for amplifying and outputting the induced audio signals 10 generated thereby. The loudspeaker 633 is coupled electrically to the auxiliary amplifier 622 for reproducing the induced audio signals amplified by the auxiliary amplifier 622. The housing 621 receives the signal current generating device 624, the current 15 inducing device, the auxiliary amplifier 622 and the loudspeaker 633 therein. In this embodiment, the primary audio amplifier 61 furtherhasacontrol signal generating unit 610 operable so as to generate a series of coded control signals 20 corresponding to the auxiliary audio amplifiers 62, outputted at the output side 612, and received by the auxiliary audio amplifiers 62 at the input sides 625 thereof such that the current inducing device of each auxiliary audio amplifier 62 further generates induced 25 control signals when the control signals pass through the signal current generating device 624. In this embodiment, each auxiliary audio amplifier 7 62 further has a switch unit 620 received in the housing 621 and coupled electrically between the current inducing device and the auxiliary amplifier 622 and operating, in response to a corresponding one of the 5 inducedcontrol signals, at a desiredone of anON-state, where the switch unit 620 makes connection between the current inducingdevice and the auxiliary amplifier 622, and an OFF-state, where the switch unit 620 interrupts connection between the current inducing device and the 10 auxiliary amplifier 622 such that the induced audio signals are not amplified and outputted by the auxiliary amplifier 622. In other words, through the coded control signals, the switch units 620 of selected auxiliary audio amplifiers 62 can be operated in the 15 OFF-state such that the selected auxiliary audio amplifiers 62 do not reproduce the induced audio signals. Referring to Figure 4, according to the second preferred embodiment of this invention, an audio reproduction apparatus 5 is shown to include a primary 20 audio amplifier 51, a plurality of auxiliary audio amplifiers 52, an auxiliary signal loop 55, and a plurality of normally-open test switches (Sl, S2). The primary audio amplifier 51 has an output side 510 for outputting audio signals. 25 The auxiliary audio amplifiers 52 are coupled electrically in series to the primary audio amplifier 51. Eachauxiliaryaudioamplifier52 includes an input 8 side 520 for receiving the audio signals from the primary audio amplifier 51, a signal current generating device 524 coupled electrically across the input side 520 such that the audio signals pass through the signal current 5 generating device 524, a current inducing device in the form of a coiled core 523 and disposed adjacent to the signal current generating device 524 for generating induced audio signals when the audio signals pass through the signal current generating device 524, an auxiliary 10 amplifier 522 coupled electrically to the current inducing device for amplifying and outputting the induced audio signals generated thereby, a loudspeaker 525 coupled electrically to the auxiliary amplifier 522 for reproducing the induced audio signals amplified by 15 the auxiliary amplifier 522, and a housing 521 for receiving the signal current generating device 524, the current inducing device, the auxiliary amplifier 522 and the loudspeaker 525 therein. In this embodiment, the coiled core 523 is elongated and is disposed parallel 20 to the signal current generating device 524. The auxiliary signal loop 55 is coupled electrically across the output side 510 of the primary audio amplifier 52, permits the audio signals from the primary audio amplifier 51 to pass therethrough, and has a plurality 25 of test nodes (A, B). Each of the normally-open test switches (Si, S2) is connected electrically between a respective one of the 9 test nodes (A, B) and a junction (Jl, J2) of a corresponding adjacent pair of the auxiliary audio amplifiers 52, and is operable via remote control so as to switch from an OFF-state to an ON-state, where 5 the respective one of the test nodes (A, B) is connected electrically to the junction (J1, J2) of the corresponding adjacent pair of the auxiliary audio amplifiers 52 therethrough, thereby permitting transmission of the audio signals from the primary audio 10 amplifier 51 to bypass a defective one of the auxiliary audio amplifiers 52 via the auxiliary signal loop 55. The following are some of the advantages of the present invention: 1. Since the audio signals outputted by the primary 15 audio amplifier 61, 51 only pass through the signal current generating device 624, 524 of each of the auxiliary audio amplifiers 61, 51, distortion of the audio signals can be minimized, thereby resulting in a stable audio signal transmission. 20 2. Since the audio reproduction apparatus 6, 5 of this invention utilizes the current inducing device of each of the auxiliary audio amplifiers 62, 52 to generate the induced audio signals associated with the audio signals from the primary audio amplifier 61, 51, the 25 number of auxiliaryaudio amplifiers 62, 52 canbe varied according to a user' s requirement such that the audio reproduction apparatus 6, 5 of this invention can provide 10 a wide audio reproduction area. 3. Regardless of how many auxiliary audio amplifiers 62, 52 are used in the audio reproduction apparatus 6, 5 of this invention, impedance matching problem between 5 the output side 610, 510 of the primary audio amplifier 61, 51andthe input side 625, 5200feachofthe auxiliary audio amplifiers 62, 52 is eliminated such that replacement of the primary audio amplifier 61, 51 is not required when the number of auxiliary audio 10 amplifiers 62, 52 that are in use is increased, thereby resulting in lower costs. 4. Due to the presence of the control signal generating unit 610 of the primary audio amplifier 61 and the switch unit 620 of each auxiliary audio amplifier 15 62, the audio reproduction apparatus 6 of this invention can flexibly control reproduction of the audio signals by the desired auxiliary audio amplifiers 62. 5. Due to the presence of the auxiliary signal loop 55 and the normally-open test switches (Si, S2), any 20 defective one of the auxiliary audio amplifiers 52 can be detected by operating the test switches (S1, S2), and regardless of the defective auxiliary audio amplifier 52, the audio reproduction apparatus 5 of this invention can still ensure a stable signal transmission. 25 For the purpose of this specification, it will be clearly understood that the word "comprising" means "including but not limited to, " and that the word 11 "comprises" has a corresponding meaning. It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms 5 a part of the common general knowledge in the art, in Australia or any other country.

Claims (9)

1. An audio reproduction apparatus comprising: a primary audio amplifier having an output side for outputting audio signals; and 5 a plurality of auxiliary audio amplifiers coupled electrically in series to said primary audio amplifier, each of said auxiliary audio amplifiers having an input side for receiving the audio signals from said primary audio amplifier, a signal current generating device 10 coupled electrically across said input side such that the audio signals pass through said signal current generating device, a current inducing device disposed adjacent to said signal current generating device for generating induced audio signals when the audio signals 15 pass through said signal current generating device, an auxiliary amplifier coupled electrically to said current inducing device for amplifying and outputting the induced audio signals generated thereby, and a loudspeaker coupled electrically to said auxiliary 20 amplifier for reproducing the induced audio signals amplified by said auxiliary amplifier; wherein said primary audio amplifier further has a control signal generating unit operable so as to generate a series of control signals corresponding to said 25 auxiliary audio amplifiers, outputted at said output side, and received by said auxiliary audio amplifiers at said input sides thereof such that said current 13 inducing device of each of said auxiliary audio amplifiers further generates induced control signals when the control signals pass through said signal current generating device; and 5 wherein each of said auxiliary audio amplifiers further has a switch unit coupled electrically between said current inducing device and said auxiliary amplifier and operating, in response to a corresponding one of the induced control signals, at a desired one 10 of an ON-state, where said switch unit makes connection between said current inducing device and said auxiliary amplifier, and an OFF-state, where said switch unit interrupts connection between said current inducing device and said auxiliary amplifier such that the induced 15 audio signals are not amplified and outputted by said auxiliary amplifier.
2. The audio reproduction apparatus of Claim 1, wherein each of said auxiliary audio amplifiers further has a housing for receiving said signal current generating 20 device, said current inducing device, said switch unit, said auxiliary amplifier and said loudspeaker therein.
3. The audio reproduction apparatus of Claim 1, wherein said current inducing device includes a coiled core.
4. The audio reproduction apparatus of Claim 3, wherein 25 said coiled core is annular and defines a plane with a center, said signal current generating device extending through the center and being perpendicular 14 to the plane.
5. The audio reproduction apparatus substantially as hereinbefore described with reference to and as illustrated in Figures 2 and 3 of the accompanying 5 drawings.
6. An audio reproduction apparatus comprising: a primary audio amplifier having an output side for outputting audio signals; a plurality of auxiliary audio amplifiers coupled 10 electrically in series to said primary audio amplifier, each of said auxiliary audio amplifiers having an input side for receiving the audio signals from said primary audio amplifier, a signal current generating device coupled electrically across said input side such that 15 the audio signals pass through said signal current generating device, a current inducing device disposed adjacent to said signal current generating device for generating induced audio signals when the audio signals pass through said signal current gene-rating device, an 20 auxiliary amplifier coupled electrically to said current inducing device for amplifying and outputting the induced audio signals generated thereby, and a loudspeaker coupled electrically to said auxiliary amplifier for reproducing the induced audio signals 25 amplified by said auxiliary amplifier; an auxiliary signal loop coupled electrically across said output side of said primary audio amplifier, 15 permitting the audio signals from said primary audio amplifier to pass therethrough, and having a plurality of test nodes; and a plurality of normally-open test switches, each of 5 which is connected electrically between a respective one of said test nodes and a junction of a corresponding adjacent pair of said auxiliary audio amplifiers, and is operable so as to switch from an OFF-state to an ON-state, where the respective one of said test nodes 10 is connected electrically to said junction of the corresponding adjacent pair of said auxiliary audio amplifiers therethrough, thereby permitting transmissionof the audio signals from said primary audio amplifier to bypass a defective one of said auxiliary 15 audio amplifiers via said auxiliary signal loop.
7. The audio reproduction apparatus of Claim 6, wherein said current inducing device includes a coiled core.
8. The audio reproduction apparatus of Claim 7, wherein said coiled core is elongated and is disposed parallel 20 to said signal current generating device.
9. The audio reproduction apparatus substantially as hereinbefore described with reference to and as illustrated in Figure 4 of the accompanying drawings.
AU2006249225A 2006-12-06 2006-12-06 Audio reproduction apparatus Ceased AU2006249225B2 (en)

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Application Number Priority Date Filing Date Title
AU2006249225A AU2006249225B2 (en) 2006-12-06 2006-12-06 Audio reproduction apparatus

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Application Number Priority Date Filing Date Title
AU2006249225A AU2006249225B2 (en) 2006-12-06 2006-12-06 Audio reproduction apparatus

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AU2006249225A1 AU2006249225A1 (en) 2008-06-26
AU2006249225B2 true AU2006249225B2 (en) 2010-05-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313867A (en) * 1940-07-31 1943-03-16 Walt Disney Prod Sound recording system
US5530770A (en) * 1994-04-11 1996-06-25 Kim; Man H. Multiple output transformers network for sound reproducing system
US5814752A (en) * 1997-01-15 1998-09-29 Rivera; Paul E. Musical instrument crossover circuits and method of using same
WO1999041831A1 (en) * 1998-02-12 1999-08-19 Paul Roger V Apparatus for improved amplification of audio signals
US6674866B2 (en) * 2001-06-01 2004-01-06 Keng-Kuei Su Audio reproduction apparatus
EP1303163B1 (en) * 2001-10-16 2005-10-05 Keng Kuei Su Audio reproduction apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313867A (en) * 1940-07-31 1943-03-16 Walt Disney Prod Sound recording system
US5530770A (en) * 1994-04-11 1996-06-25 Kim; Man H. Multiple output transformers network for sound reproducing system
US5814752A (en) * 1997-01-15 1998-09-29 Rivera; Paul E. Musical instrument crossover circuits and method of using same
WO1999041831A1 (en) * 1998-02-12 1999-08-19 Paul Roger V Apparatus for improved amplification of audio signals
US6674866B2 (en) * 2001-06-01 2004-01-06 Keng-Kuei Su Audio reproduction apparatus
EP1303163B1 (en) * 2001-10-16 2005-10-05 Keng Kuei Su Audio reproduction apparatus

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