CN1816218B - 具有至少两个换能器的移动终端 - Google Patents

具有至少两个换能器的移动终端 Download PDF

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CN1816218B
CN1816218B CN2006100042071A CN200610004207A CN1816218B CN 1816218 B CN1816218 B CN 1816218B CN 2006100042071 A CN2006100042071 A CN 2006100042071A CN 200610004207 A CN200610004207 A CN 200610004207A CN 1816218 B CN1816218 B CN 1816218B
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transducer
portable terminal
working band
band
frequency
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CN1816218A (zh
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杰勒德·道赫特
斯蒂芬·杜福斯
阿兰·吉洛廷
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Flextronics Innovation Development Co ltd
Z124 Co
Tag Comm Inc
Imerj Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • 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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/72442—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality for playing music files
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • General Health & Medical Sciences (AREA)
  • Stereophonic Arrangements (AREA)
  • Telephone Function (AREA)
  • Stereophonic System (AREA)
  • Telephone Set Structure (AREA)

Abstract

本发明涉及一种具有至少两个被同时用作用于立体声效果的扩音器的换能器(LSm、LSs1、LSs2)的移动终端。根据本发明，所述换能器之一是具有至少对应于电话频带的主工作频带(Bm)的主换能器(LSm)，而其他换能器是具有不同于所述主频带的辅助工作频带(Bs1；Bs2)的辅助换能器(LSs1；LSs2)，所述辅助工作频带(Bs1；Bs2)的最低频率大于所述主工作频带的最低频率。其优点是：得到良好的立体声效果，同时保持装置的小尺寸。

Description

具有至少两个换能器的移动终端
技术领域
本发明涉及一种被提供有几个(至少两个)换能器(transducer)的移动终端，其中所述换能器被用作用于立体声效果的扩音器。更一般地，本发明涉及所有被提供有播放声音信号(语音信号或旋律)的功能的移动装置，例如移动电话、或个人数字助理、或录音机。
背景技术
所有现有的移动电话包括一个用作耳机的换能器，用于收听呼叫者的语音。一些移动电话也被提供有一个用作用于免提(hand off)通信的扩音器的换能器。这个换能器一般与用作耳机的换能器相同。在两种情况下，通常的换能器工作在标准化的电话频带上，该频带对应于语音信号的音频频带，即在300Hz和3400Hz之间，或在用于宽带电话的100Hz和8000Hz之间。
最近，已经提出了用于播放旋律(或者为铃声旋律，或者是各种声音信号)的移动电话。在某些情况下，同一换能器被用作耳机、免提扩音器和旋律播放器。然而，音乐的有用频带在20Hz和20KHz之间，这包括上述的标准化的电话频带，但是极大地向低频和高频两端扩展。结果，已经开发了特定的换能器以便仅仅利用一个换能器来获得用于音乐的良好声音。通常，这些特定换能器具有重要的参数(size)以便能够复原良好的声音，特别是对于低频。
现在，为了获得立体声效果，需要提供具有至少两个用作扩音器的换能器的移动终端。已知提供了一种具有两个相同的、用作用于立体声效果的扩音器的换能器的移动电话，所述两个换能器具有相同的工作频带。但是，必须在下述两方面之间进行折衷，一方面，希望即使是对于音乐也具有良好的立体声效果，而另一方面是体积限制。在移动电话领域中，实际情况是，其趋势是尽可能地小型化电话的总尺寸，而保持一些重要的特征，例如大屏幕和键盘。
结果，已知的移动电话对于各种声音信号，特别是对于音乐不能获得良好的立体声效果。
发明内容
本发明的目的是通过提出一种能够利用小尺寸的装置得到非常良好的立体声效果的解决方案来克服上述缺点。
为了此目的，本发明的一个目的是提供一种具有至少两个换能器的移动终端，所述换能器被同时用作用于立体声效果的扩音器，其特征在于：所述换能器之一是具有至少对应于电话频带的主工作频带的主换能器，同时，而另一换能器是具有不同于所述主频带的辅助工作频带的辅助换能器，所述辅助工作频带的最低频率大于主工作频带的最低频率。
在本发明的第一实施例中，所述移动终端仅仅包括所述主换能器和单个辅助换能器，以及所述主工作频带包括所述辅助工作频带。
在本发明的第二实施例中，所述移动终端包括所述主换能器和至少两个具有基本上相同的辅助工作频带的辅助换能器，以及所述主工作频带的最高频率对应于所述辅助工作频带的最低频率。
附图说明
从参照附图和仅仅以非限制性示例的方式给出的本发明的两个实施例的描述，本发明的其它特征和优点变得清楚，其中：
图1示意性地示出了根据本发明的第一实施例；
图2示出了第一实施例的换能器的工作频带的相对位置；
图3示意性地示出了根据本发明的第二实施例；
图4示出第二实施例的换能器的工作频带的相对位置；
图5a和图5b示出根据本发明第二实施例的、被提供有三个换能器的机壳的一半部分；
图6示出说明第二实施例的可能信号处理的概述。
具体实施方式
参照图1，图1表示根据本发明的第一可能实施例，即移动终端(例如移动电话)，所述移动终端被提供有两个同时被用作用于立体声效果的扩音器的换能器。选择所述换能器之一(在下文称为“主换能器”LSm)，以便其工作频带Bm包括电话频带，其是在例如300Hz和3400Hz之间的标准化频带。在图2的例子中，主工作频带Bm的最低频率基本上对应于电话频带的最低频率。然而，最低频率也可以小于电话频带的最低频率。选择另一换能器(在下文称为“辅助换能器”LSs1)以便其工作频带Bs1位于频谱的高频部分。更具体而言，如从图2中所看到的，辅助工作频带Bs1的最低频率大于所述主工作频带Bm的最低频率。为了利用仅仅两个上述换能器获得立体声效果，主工作频带Bm也包括辅助工作频带Bs1。
由于在频谱的高频部分选择辅助频带Bs1，其具有可达到20KHz的较高频率，所以申请人利用上述实施例所进行的测试不仅对于语音信号，而且对于音乐都得到了良好的立体声效果。
而且，因为辅助换能器的工作频带处于高频，所以不需要而将其尺寸扩大。
为了增强立体声效果，最好，将主换能器LSm和辅助换能器LSs1彼此之间设置得尽可能远。如图1所示，移动终端包括沿纵向轴2方向延伸的平行六面体类型的形式的机壳1。因此，可以沿所述纵向轴2的方向将主换能器LSm和辅助换能器LSs1彼此尽可能远地放置在所述机壳1内。在这种情况下，用户将可以通过将移动终端放置在一个平面上以便纵向轴2与所述平面平行来得到最大立体声效果。
由于主频带至少包括所述电话频带，所以主换能器LPm也可用于电话机的其他传统功能，特别是耳机和/或免提扩音器。
图3和4示出根据本发明的第二实施例，其中，所述移动终端被提供有主换能器LSm和具有基本上相同的辅助工作频带Bs1、Bs2的两个辅助换能器LSs1、LSs2。如在前面的第一实施例，主工作频带Bm的最低频率可以基本上对应于电话频带的最低频率，并且辅助工作频带Bs1、Bs2位于频谱的高频部分，以便辅助工作频带Bs1、Bs2的最低频率大于所述主工作频带Bm的最低频率。然而，由于立体声效果主要归因于辅助换能器，所以在本实施例中，主频带Bm也不需要包括辅助频带Bs1和Bs2。以不同方式，如从图4可以看到的，所述主工作频带的最高频率对应于所述辅助工作频带的最低频率。
为了增强立体声效果，最好，将辅助换能器LSs1和LSs2彼此之间设置得尽可能远。如图3所示，可以沿所述纵向轴2的方向将辅助换能器LSs1和LSs2彼此尽可能远地放置在所述机壳1内。如已经针对第一实施例所提到的，用户将可以通过将移动终端放置在一个平面上以便纵向轴2与所述平面平行来得到最大立体声效果。
而且，由于主频带Bm基本上对应于电话频带，所以主换能器LPm可以是传统上在手机电话机中用作耳机和/或免提扩音器的换能器。
图5a和图5b图解根据第二实施例的、被提供有三个换能器的移动手机。为了更好的理解，已经移去机壳的上半部分以便看机壳的内部。图5a示出在插入机壳的下半部分1’的内部之前的主换能器LSm和辅助换能器LSs1和LSs2，而图5b示出在被插入所述下半部分时的相同部件。应当注意，辅助换能器LSs1和LSs2小于主换能器LSm。因此，由于本发明，可以获得良好的立体声效果，同时不忘体积限制。如特别是从图5a看到的，由于从换能器的后侧和前侧发出的声波的重新组合，所以通常需要将主换能器LSm放置在密封的空腔2中以便减少声短路(acoustic short-circuit)。然而，对于对应于低声的低频，特别可能发生声短路现象。因为，根据本发明，在频谱的高频部分中选择辅助工作频段，所以不需要为辅助换能器提供这样的密封。结果，辅助换能器可以方便地位于机壳内部非常末端的位置上。
用作主换能器和辅助换能器的换能器可以是诸如机电换能器或压电换能器之类的任何类型。
除了参照图1到5b描述的上述特征之外，还可以利用提供给不同换能器的信号的特定信号处理来获得增强的立体声效果。图6示出说明在对应于第二实施例的情况中可能进行的信号处理的概述。在该图中，假定要播放的声音信号是由其右和左声道R和L表示的立体声信号。然而，必须理解，甚至在声音信号不是立体声信号的情况下也能获得更好的立体声效果。声道R和L两者通常被重新组合以便传送到主换能器LSm。在组合装置和主换能器LSm之间可以引入低通滤波器LPF。右和左声道的每一个也通过高通滤波器HPF分别连接到所述辅助换能器LSs1和LSs2之一。不同的滤波器LPF和HPF的特性将取决于所使用的换能器，也取决于每一换能器的环境。因此，高通滤波器HPF可以是不同的。由所述高通滤波器传送的信号可以被直接传送到每一辅助换能器LSs1和LSs2。也可以进一步通过执行众所周知的空间化定位算法(spatialization algorithm)来增加立体声效果。这通过利用标记Spa而示出在图6中，包括在每个声道上组合在特定滤波之后在另一声道上所得到的信号的部分。上述信号处理也可以适用于根据第一实施例的移动终端。

Claims (10)

1.一种具有至少三个被同时用作扩音器以提供立体声效果的换能器(LSm、LSs1、LSs2)的移动终端，其特征在于：
所述换能器中的第一换能器用于再生具有落入至少对应于电话频带的第一工作频带(Bm)的信号，以及
所述至少三个换能器中的第二换能器和第三换能器用于再生具有落入不同于所述第一工作频带的第二工作频带(Bs1；Bs2)的信号，所述第二工作频带(Bs1；Bs2)的最低频率大于所述第一工作频带的最低频率，所述第二换能器和所述第三换能器具有基本上相同的工作频带(Bs1；Bs2)，所述第一工作频带(Bm)的最高频率对应于所述第二换能器和所述第三换能器的工作频带(Bs1；Bs2)的最低频率。
2.如权利要求1所述的移动终端，其特征在于所述第一工作频带(Bm)与所述第二工作频带(Bs1)部分重叠。
3.如权利要求2所述的移动终端，其特征在于该移动终端包括沿纵向轴(2)延伸的机壳(1)，所述第一换能器(LSm)和所述第二换能器(LSs1)沿着所述纵向轴(2)的方向、彼此相隔最大距离地位于所述机壳(1)内部。
4.如权利要求1所述的移动终端，其特征在于该移动终端包括沿纵向轴(2)延伸的机壳(1)，所述第二换能器和所述第三换能器(LSs1，LSs2)沿着所述纵向轴(2)的方向、彼此相隔最大距离地位于所述机壳(1)内部。
5.根据权利要求1所述的移动终端，其特征在于所述电话频带对应于300Hz到3400Hz或者对应于100Hz到8000Hz。
6.根据权利要求1所述的移动终端，其特征在于所述第一换能器(LSm)被进一步配置为耳机和免提扩音器中的至少一者。
7.根据权利要求1所述的移动终端，其特征在于所述第一换能器(LSm)和所述第二换能器是机电换能器或压电换能器。
8.根据权利要求1所述的移动终端，其特征在于它还包括至少一频率滤波器(HPF、LPF)，该至少一频率滤波器被配置为对传送到所述第一换能器(LSm)和所述第二换能器(LSs1、LSs2)中至少一者的信号进行滤波。
9.根据权利要求1所述的移动终端，其特征在于每一个第二换能器被配置为通过高通滤波器而被连接至右声道和左声道中的每一者。
10.根据权利要求9所述的移动终端，其特征在于该移动终端还包括频率空间化定位单元(Spa)，该频率空间化定位单元被配置为在每个单独的声道上组合另一声道上所得到的信号的部分。
CN2006100042071A 2005-02-03 2006-01-28 具有至少两个换能器的移动终端 Expired - Fee Related CN1816218B (zh)

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US9888332B2 (en) 2018-02-06
US10547959B2 (en) 2020-01-28
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ATE428257T1 (de) 2009-04-15
US8897471B2 (en) 2014-11-25
US20200145772A1 (en) 2020-05-07
RU2006103064A (ru) 2007-08-20
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CA2533170A1 (en) 2006-08-03
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