KR20070112520A - Testing sound quality using audio loop back - Google Patents

Abstract

A sound quality test method using audio loopback of a mobile communication terminal and a device are provided to test the sound quality of an MP3 file and a voice signal transmitted/received from a digital terminal embedded with a Bluetooth module by using audio loopback, thereby improving sound quality as reducing time loss for the test. A test signal of a predetermined frequency is generated and transmitted to a mobile communication terminal through a cable or in a short-range wireless communication way(S210,S220). If an audio looped-back signal is inputted from the terminal through the cable or in the short-range wireless communication way, an audio measurement parameter value is calculated by using the test signal and the audio looped-back signal(S230,S240). The audio measurement parameter value is displayed through a display as time information(S250).

Description

Test method and device for testing sound quality using audio loopback of mobile communication terminal

1 is an example of a sound quality test using an audio loop back of a CDMA terminal with a built-in Bluetooth module according to an embodiment of the present invention.

2 is an operational flow diagram illustrating a test method in the embodiment of FIG. 1 in accordance with a preferred embodiment of the present invention.

3 is a sound quality test via a temporarily generated call for Bluetooth wireless communication according to an embodiment of the present invention.

4 illustrates a sound quality test using an audio loop back when a CDMA terminal having a Bluetooth module according to an embodiment of the present invention receives a signal generated for testing by Bluetooth wireless communication. An example of.

5 is an operational flow diagram illustrating a test method in the embodiment of FIG. 4 in accordance with a preferred embodiment of the present invention.

6 is an example of sound quality test when a CDMA terminal with a built-in Bluetooth module transmits by Bluetooth wireless communication according to an embodiment of the present invention.

7 is an operational flow diagram illustrating a test method in the embodiment of FIG. 6 in accordance with a preferred embodiment of the present invention.

8 is an example of a sound quality test when transmitting and receiving by Bluetooth wireless communication between CDMA terminals with a built-in Bluetooth module according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: sound quality test device 102: test signal generator

103: interface unit 106: waveform analysis unit

104, 105: Bluetooth module

108, 109; cable

110: first terminal 120: second terminal

112, 122: Bluetooth module

114, 124: MSM (Mobile Station Modem)

The present invention relates to a sound quality test of a mobile communication terminal, and more particularly, to a sound quality test method and apparatus using an audio loopback of a mobile communication terminal.

In general, the Bluetooth function is a low-cost short-range wireless specification, a standard for short-range, one-to-many, and radio frequency for voice and data transmission. Bluetooth is based on short-range wireless communication, and uses a temporary call for a fixed terminal or a wireless terminal communication environment.

In recent years, Bluetooth has gained various application potentials beyond the simple cable replacement effect, and has been applied to not only short-range wireless communication field but also audio and computer related devices.

Code Division Multiple Access (CDMA) is a digital mobile communication system, also referred to as code division multiple access or code division multiple access. The CDMA system is a method for multiplexing a user through a code division for a wireless network access method between a mobile station and a base station.

In the conventional frequency division multiple access (FDMA) method or time division multiple access (TDMA) method, the system capacity is limited as the user increases rapidly, but in the CDMA method, code division is limited. Since the user's wireless network connection is made, the mobile terminal can have a much larger capacity. Therefore, the CDMA method is widely used in digital mobile communication terminals.

Recently, a CDMA terminal equipped with a Bluetooth function has been released. It is a next-generation wired / wireless integrated service that can be called indoors (in the action privilege area) with a mobile phone with a wired telephone function and outdoors with an existing mobile phone (outside the action privilege area).

Conventionally, there has been a sound quality test method for a voice signal passing through a Bluetooth module, or a sound quality test method for a voice signal passed through an MSM.

However, there is a problem in that the sound quality cannot be measured because there is no measuring method for the MP3 file and the voice signal that enters the speaker stage through the embedded MSM.

In order to solve the conventional problems as described above, the present invention tests the sound quality of the MP3 and voice signals transmitted or received in the digital mobile communication terminal equipped with a Bluetooth module using an audio loop back (Audio Loop back) To propose a method and apparatus.

In addition, the present invention provides a sound quality test method and apparatus that can determine the good quality of the sound quality according to the use radius of the digital mobile communication terminal in which the Bluetooth module is embedded, and can reduce the time loss required for other tests. I would suggest.

Still other objects of the present invention will be readily understood through the following description of the embodiments.

In order to achieve the above object, according to an aspect of the present invention, in the sound quality test method of the mobile communication terminal, generating a test signal of a predetermined frequency and transmitting to the mobile communication terminal via a short-range wireless communication method or cable Doing; And calculating an audio measurement parameter value by using the test signal and the audio loopback signal when the audio loopback signal is input from the mobile communication terminal through a short range wireless communication scheme or a cable. This is provided.

The sound quality test method may further include displaying the audio measurement parameter value as visual information through a display unit.

The short range wireless communication method may be a Bluetooth communication method. The terminal may be a CDMA mobile communication terminal.

According to another aspect of the present invention, a sound quality test apparatus of a mobile communication terminal, comprising: a test signal generator for generating a test signal; An interface unit for transmitting the test signal to the mobile communication terminal and receiving an audio loopback signal from the mobile communication terminal; And a waveform analyzer configured to calculate an audio measurement parameter value using the test signal and the audio loopback signal.

The interface unit may include a short range wireless communication module, and the test signal and the audio loopback signal may be transmitted and received through short range wireless communication between the wireless communication module and the mobile communication terminal.

The sound quality test apparatus further includes a monitor configured to monitor whether the sound quality test apparatus and the mobile communication terminal are coupled by a cable, when the interface unit recognizes that the sound quality is coupled by a cable. Through the test signal and the audio loopback signal can be transmitted and received.

The sound quality test apparatus may further include a display unit for displaying the audio measurement parameter value calculated by the waveform analyzer as visual information.

The short range wireless communication method may be a Bluetooth communication method. The terminal may be a CDMA mobile communication terminal.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the reference numerals and redundant description thereof will be omitted. In addition, although the communication method and the short-range communication module provided in the mobile communication terminal according to the present invention can be applied without limitation, it is assumed that the Bluetooth module is built as a CDMA terminal for convenience of description.

1 is an example of a sound quality test apparatus using an audio loop back of a CDMA terminal with a built-in Bluetooth module according to an embodiment of the present invention. In more detail, it is an example of the sound quality test of the terminal when the test signal is directly input to the terminal.

Referring to FIG. 1, the sound quality test apparatus 100 according to an exemplary embodiment of the present invention may include a test signal generator 102, a waveform analyzer 106, and an interface 104. The interface unit 103 may be connected to the CDMA terminal 110 in which the Bluetooth module is embedded through the cables 108 and 109.

Although the sound quality test apparatus 100 is displayed separately from the first terminal 110 in FIG. 1, the sound quality test apparatus 100 of FIG. 1 may be included in the first terminal 110.

In addition, the sound quality test apparatus 100 may further include a display unit configured to display the analysis result of the waveform analyzer 106 as visual information. The analysis result of the waveform analyzer 106 may be transmitted to an external computer through the interface unit 103, may be stored in a storage device or a memory that is combined or provided, or may be output through a combined display unit or a printer.

Although the controller is not illustrated in the sound quality test apparatus 100 in FIG. 1, a controller for controlling the test signal generator 102, the interface unit 103, and the waveform analyzer 106 may be further included. It will be obvious to you.

The test signal generator 102 generates a test signal for an audio loop back according to an exemplary embodiment of the present invention.

In the case of a voice signal, the effective frequency band is 300Hz to 4300Hz, and in general, the 300Hz to 4000Hz band is mainly used as a voice frequency band in a CDMA mobile communication terminal.

It is also a clean sine wave without distortion when measured with a clear sound meter.

Accordingly, the test signal generator 102 may generate, for example, a 1 kHz sine wave (hereinafter, referred to as an “original sound signal”), which is an analog signal included in an effective frequency band of the voice signal, as a test signal of the voice signal.

In this case, the 1 kHz sine wave is merely an embodiment, and may be another frequency included in an effective frequency band of the voice signal, and the waveform may be a cosine wave or another sine wave.

At this time, the recognition signal may be added to the waveform analyzer 106 to recognize that the test signal starts in front of the sine wave of 1 kHz.

The test signal is input to the waveform analyzer 106 to be compared with a signal that is later audio looped back and is also input to the first terminal 110 to test the sound quality.

In this case, although not shown in FIG. 1, the sound quality test apparatus 100 may include a memory or a storage device, and the original sound signal may be stored in the memory or the storage device.

At this time, since the main purpose of the embodiment is the sound quality test of the CDMA terminal in which the Bluetooth module is embedded, the first terminal 110 through the cable 108 in order to minimize other distortion that may occur during the transmission of the original sound signal. ) May be input a test signal.

When a test signal is directly input from the sound quality test apparatus 100 to the first terminal 110, the Bluetooth module 112, which performs only a path, receives the input test signal (ie, the original sound signal). To the mobile station modem 114 (MSM).

The MSM 114 converts the analog signal into a digital signal to output the received signal to the speaker or earphone of the terminal.

According to the exemplary embodiment, the MSM 114 may perform an audio loopback function of receiving the converted digital signal for output again, converting the converted digital signal into an analog signal, and transmitting the analog signal to the Bluetooth module 112.

That is, the converted digital signal is input to the MSM 114 again by audio loopback, and the MSM 114 converts the analog signal (hereinafter, referred to as a 'receiving signal') from the input digital signal back into the Bluetooth module 112. ).

In this case, the Bluetooth module 112 performs only a path, and inputs the received sound signal to the interface unit 103 of the sound quality test apparatus 100 through the cable 109 to minimize distortion. The received sound signal input to the interface unit 103 is transmitted to the waveform analyzer 106.

Of course, the audio loopback function of the MSM 114 may be a function of converting the analog signal back into the analog signal within the MSM 114 and transmitting it to the Bluetooth module 112 without the external output of the digital signal, in which case the MSM 114 is digital. The process of receiving the signal again may be omitted.

The waveform analyzer 106 may test the performance of the first terminal 110 by comparing the original sound signal with the received sound signal. More specifically, from the time when the test signal is directly input to the CDMA terminal in which the Bluetooth module is embedded, the audio signal is looped back and input to the interface unit 103 of the sound quality test apparatus 100. On the path, we can test to what extent we can restore the original sound signal.

The waveform analyzer 106 may use general audio measurement parameters when comparing the original sound signal with the received sound signal. For example, sound quality can be compared by measuring signal-to noise and distortion ratio (SINAD), root mean square (RMS) distortion, peak power, etc. have.

The signal-to-noise and distortion ratio (SINAD) is expressed in db as the ratio of the RMS value of the converter noise from the input signal to direct current (DC) to the Nyquist frequency containing harmonic content.

Distortion refers to the degree to which the original signal is deformed or altered due to some reason.

Peak Power refers to the maximum output the terminal can produce regardless of the distortion of the voice signal.

The waveform analysis unit 106 compares the original sound signal with the received sound signal by measuring the signal-to-noise and distortion ratio SINAD, RMS distortion, peak power, and the like, as described above. 1 The sound quality of the terminal 110 can be tested.

For example, the original sound signal is a clean sine wave of 1Khz, and the received sound 1 may be a 1Khz signal file with a lot of distortion. In this case, the waveform analyzer 106 may compare and analyze the degree to which the received sound 1 matches the original sound signal through the above-described audio measurement parameter.

At this time, when a recognition signal for indicating the start of the test signal is added to the beginning of the original sound signal, there will be a corresponding recognition signal at the beginning of the received sound signal, and the waveform analysis unit 106 is located at the rear of each recognition signal. The signals may be used to compare and analyze the sound quality of the two. In addition, when the waveform analyzer 106 may measure a time delay from the recognition signal of the original sound signal and the recognition signal of the received sound signal, the waveform analyzer 106 may further include a compensator for time delay compensation. In addition, when the original sound signal is not generated in real time for analysis and stored in a separate memory or storage device, the waveform analyzer 106 may compare and analyze the sound quality by using the stored original sound signal and the received received sound signal. Self-explanatory

At this time, the comparative analysis result between the original sound signal and the received sound signal by the waveform analysis unit 106 is displayed on the display unit as visual information, transmitted to the external computer through the interface unit 103, stored in a storage device or memory, or externally It can be output through an output device (for example, a printer, a display, etc.). The display of the comparative analysis result may be performed by the waveform analyzer 106 or controlled by the controller described above.

As described above, the voice test of the CDMA terminal with a built-in Bluetooth module was not possible in the related art, but according to an embodiment of the present invention, the voice signal is directly inputted by directly inputting the voice signal to the CDMA terminal with a built-in Bluetooth module. You can test the recovery.

Hereinafter, portions overlapping with the description of FIG. 1 will be omitted.

2 is an operational flowchart illustrating a test method in the embodiment of FIG. 1 in accordance with a preferred embodiment of the present invention.

Hereinafter, descriptions overlapping with the details already described will be omitted with reference to the exemplary embodiment of FIG. 1.

Referring to FIG. 2, in which the sound quality test method according to the embodiment of FIG. 1 is illustrated, in step S210, the test signal generator 102 generates a test signal having a predetermined frequency (eg, 1 kHz). In generating the test signal, the test signal generator 102 may add a recognition signal to enable the waveform analyzer 106 to recognize that the test signal starts before the test signal. The addition of the recognition signal may be performed before the generation of the test signal or after the generation of the test signal.

In step S220, the test signal is input to the waveform analyzer 106 to be compared and analyzed later with the audio loopback signal (in which case, the input signal is referred to as an 'original sound signal') and a first terminal for sound quality test. Input 110.

In operation S230, the first terminal 110 converts an audio loopback signal (that is, a signal converted from a test signal into a digital signal and then converted into an analog signal, hereinafter referred to as a 'receiving signal'). To send). The received sound signal is input to the waveform analyzer through the interface unit 103.

In step S240, the waveform analyzer 106 determines whether the received sound signal is a signal recovered from the original sound signal (e.g., signal-to-noise and distortion ratio (SINAD), rms distortion, maximum) Compare and analyze using output (Peak Power).

Comparison and analysis results by the waveform analyzer 106 may be displayed on the display unit as visual information (S250). Of course, the result of the comparison and analysis may be transmitted to an external computer through the interface unit 103, stored in a combined or provided storage device or memory, or output through an external output device (for example, a printer). .

3 is an example of a sound quality test through a call temporarily generated for Bluetooth wireless communication according to an embodiment of the present invention.

Referring to FIG. 3, the interface unit 103 may further include Bluetooth modules 104 and 105. In FIG. 3, the Bluetooth module is divided into a transmission module and a reception module, but it is obvious that the transmission module and the reception module may be implemented by being integrated.

Although not shown in the sound quality test apparatus 100 of FIG. 3, the sound quality test apparatus 100 may further include a controller, and the interface unit 103 may include a cable between the interface unit 103 and the first terminal 110. It may further include a monitoring unit for monitoring whether or not coupled via (108, 109).

In this case, the control unit pre-specifies the program settings, and basically, the interface unit 103 and the first terminal 110 transmit signals (signals generated for a test or a reception sound signal) through the cables 108 and 109, respectively. If it is detected that the above-described monitoring unit is not coupled by a cable, the interface unit 103 and the first terminal 110 via a Bluetooth wireless communication signal (signal generated for the test or received sound signal ) Can be transmitted and received respectively.

Or vice versa, the pre-specified program in the control unit, basically the interface unit 103 to the Bluetooth wireless communication, the cable 108, only when the above-described monitoring unit detects that there is a coupling by the cable (108, 109) 109 may be used to transmit and receive a signal (a generated signal or a test tone signal for testing).

In addition, the sound quality test apparatus 100 may further include a selection unit (not shown) including at least one of a key, a switch, a button, and the like, and the interface unit 103 and the first terminal device 110 may signal. When transmitting and receiving (a signal generated for a test or a reception sound signal), respectively, the control unit controls the interface unit 103 according to the input of the selection unit, which is either Bluetooth wireless communication or the cable 108, 109. Can be.

The test signal generator 102 inputs a test signal to the waveform analyzer 106 (in this case, the input signal is referred to as an “original sound signal”), and transmits the test signal to the interface unit 103 as described above with reference to FIG. 1. same.

According to an embodiment, the interface unit 103 may transmit the test signal from the Bluetooth transmission module 104 through Bluetooth wireless communication and receive the test signal again from the Bluetooth reception module 105. In this case, a call (hereinafter referred to as a BT call) temporarily generated from the module 104 transmitting through the Bluetooth radio to the receiving module 105 is used. In this case, the distortion of the Bluetooth wireless communication may be added to the test signal. Can be.

The test signal (received signal 'receive signal') received by the Bluetooth receiving module 105 through the Bluetooth wireless communication is input to the waveform analysis unit 106, and the waveform analysis unit 106 and the original sound signal The received sound signal is compared and analyzed.

As described above, when the test signal is transmitted and received by Bluetooth wireless communication, the audio measurement parameters (for example, signal-to-noise and distortion ratio (SINAD), the effective value indicate how much the received sound signal recovers the original sound signal). (RMS), Distortion, Peak Power, etc.

Furthermore, the characteristics of the temporarily generated call, that is, the BT call, can be simply tested as described above when transmitting and receiving by Bluetooth wireless communication according to the usage area of the mobile communication terminal in which the Bluetooth module is embedded.

In addition, in the embodiments of FIGS. 4 to 9 to be described below, the characteristics of the BT call (that is, the interface unit 103 and the terminal 110 transmit and receive a signal generated by the Bluetooth wireless communication, or a reception sound signal) In order to approximate the characteristics of the temporarily generated call), it is possible to compare and analyze only the characteristics of the MSMs 114 and 124 in the terminals 110 and 120 separately.

4 is a sound quality test using an audio loop back when a CDMA terminal having a Bluetooth module according to an embodiment of the present invention receives a signal generated for a test via Bluetooth wireless communication; Is an example.

According to the exemplary embodiment, the test signal generator 102 generates a signal for a test and inputs the signal to the waveform analyzer 106 (the input signal is referred to as an 'original sound signal'). The Bluetooth module 104 transmits via Bluetooth wireless communication.

At this time, the interface unit 103, such as a switch, a key, a button that can be selected whether to transmit and receive with the terminal 110 via Bluetooth wireless communication, or directly connected via a cable (108, 109) The selection unit may be further included outside the sound quality test apparatus 100, or the controller transmits and receives any one of Bluetooth wireless communication or a cable by a predetermined program setting in the control unit, and a monitoring unit for monitoring the presence or absence of a cable is coupled to the cable. 3, the interface unit 103 may be controlled to transmit and receive via a cable as described above with reference to FIG. 3.

According to an embodiment, the signal generated for the test transmitted from the interface unit 103 to the Bluetooth wireless communication is received by the Bluetooth module 112 of the first terminal 110 through the Bluetooth wireless communication and transmitted to the MSM 114. After that, the process of audio loopback and input to the waveform analyzer 106 (the signal input at this time is called a 'receive sound signal') will be omitted as described with reference to FIG. 1.

According to the embodiment of Figure 4, when the first terminal 110 receives the signal generated for the test via the Bluetooth wireless communication test through the audio measurement parameter described above how much the received sound signal can recover the original sound signal can do.

In addition, according to the embodiment of Figure 4, Bluetooth from the time point transmitted by the Bluetooth communication module 104 of the sound quality test apparatus 100 to the Bluetooth module 112 of the first terminal 110 received. The temporarily generated call for communication may be approximated (ie, the degree of distortion is approximated) with the BT call of FIG. 3. Therefore, when reflecting the degree of distortion of the BT call according to the embodiment of FIG. 3, when the first terminal 110 receives the signal generated for the test via Bluetooth wireless communication, the sound quality reflecting the characteristics of the MSM may be tested. have. That is, in the process of receiving the signal generated for the test by the wireless module 112 by the wireless communication in the first terminal 110, the MSM (Mobile Station Modem) 114 is to control the Bluetooth module 112, this process Tests can be made to account for distortions that may occur in the system.

Furthermore, according to the embodiment of Figure 4, when repeating the sound quality test while gradually increasing the distance between the sound quality test device 100 and the first terminal 110, the performance of the first terminal 110 according to the radius of use It has the advantage of being able to test it. In more detail, in the CDMA first terminal 110 in which the Bluetooth module 112 is embedded, the sound quality may be tested by reflecting reception characteristics of Bluetooth wireless communication according to a radius of use. In this case, an increase in the length of the cable 109 according to the radius of use should be taken into consideration. However, when the distortion of the cable is minimized, the sound quality test reflecting the reception characteristics of the Bluetooth wireless communication of the first terminal 110 can be simplified.

5 is an operational flowchart illustrating a test method in the embodiment of FIG. 4 in accordance with a preferred embodiment of the present invention.

Hereinafter, descriptions overlapping with the details already described will be omitted with reference to the exemplary embodiment of FIG. 4.

Referring to FIG. 5, in which the sound quality test method according to the embodiment of FIG. 4 is illustrated, in step S510, the test signal generator 102 generates a test signal having a predetermined frequency (for example, 1 Khz) (S510). In generating the test signal, the test signal generator 102 may add a recognition signal to enable the waveform analyzer 106 to recognize that the test signal starts before the test signal. The addition of the recognition signal may be performed before the generation of the test signal or after the generation of the test signal.

In step S520, the signal generated for the test is input to the waveform analyzer 106 in order to be compared and analyzed later with the audio loopback signal (in this case, the input signal is referred to as 'original sound signal'), and also the sound quality test is performed. The sound quality test apparatus 100 to transmit the Bluetooth wireless communication

In step 530, the signal generated for the test at the terminal 110 is received by the Bluetooth module 112 via Bluetooth wireless communication and the audio loopback signal at the MSM 114 (that is, the test signal is converted into a digital signal and then again). The signal converted into an analog signal is input to the waveform analyzer 106 through the interface unit 103 of the sound quality test apparatus 100 (in this case, the input signal is referred to as a 'receiving signal').

In step S540, the waveform analyzer 106 compares and analyzes how much the received sound signal has recovered the original sound signal as an audio measurement parameter.

At this time, although not shown in Figure 5, the Bluetooth quality from the Bluetooth module 104 of the sound quality test device 100 to the time point received by the Bluetooth module 112 of the first terminal 110, Bluetooth Approximating the temporarily generated call for the wireless communication with the BT call of FIG. 3 (i.e., approximating the distortion generated in the step of transmitting and receiving the Bluetooth wireless communication) and referring to the embodiment of FIG. As described above, the MSM 114 may control the Bluetooth module 112 while the first terminal 110 receives the signal generated for the test in the Bluetooth module 112 through Bluetooth wireless communication. It may include testing the sound quality reflecting the distortion.

In addition, when the distance between the sound quality test device 100 and the first terminal 110 is gradually widened and used according to the use radius (that is, the terminal 110 receives a signal generated for testing by Bluetooth wireless communication) Repeating the sound quality test (according to the radius).

In operation S550, the comparison and analysis results of the waveform analyzer 106 may be displayed on the display unit as visual information. Of course, the comparison analysis result may be transmitted to, coupled with or provided to an external computer through the interface unit 103. The data may be stored in a storage device, a memory, or output through an external output device (for example, a printer).

6 is an example of a sound quality test when a CDMA terminal with a built-in Bluetooth module transmits by Bluetooth wireless communication according to an embodiment of the present invention.

According to the exemplary embodiment, the test signal generator 102 inputs the signal generated for the test to the waveform analyzer 106 (the input signal is referred to as 'original sound signal'), and the interface unit 103 is used. In order to minimize other distortion that may occur during the transmission of the original sound signal through the cable 108 is input to the terminal.

In this case, the process up to the audio loop back and input to the Bluetooth module 112 is the same as the description of FIG. 1 and will be omitted.

The signal generated for the test by the first terminal 110 is transmitted from the Bluetooth transmission module 112 through Bluetooth wireless communication, and the Bluetooth reception module 104 included in the interface unit 103 of the sound quality test apparatus 100 is Bluetooth. Receive by wireless communication. (The test signal received at this time is called the 'receiving signal')

In this case, the sound quality test apparatus 100 may include a switch, a key, a button, and the like so that the interface unit 103 may specify whether the terminal 110 is to transmit or receive a signal through a Bluetooth wireless communication method or a cable 108 or 109. It may further include a selection unit including one or more. Alternatively, the control unit may transmit and receive via any one of Bluetooth wireless communication or a cable with a predetermined program setting, and further include a monitoring unit for monitoring whether the cable is coupled or not. The interface unit 103 may be controlled to transmit and receive as described above with reference to FIG. 3.

After that, the received sound signal is input to the waveform analyzer 106 and compared and analyzed by the original sound signal and the audio measurement parameter, and thus the description thereof is omitted.

According to the embodiment of FIG. 6, when the first terminal 110 transmits the signal generated for the test from the Bluetooth module 112 to the Bluetooth wireless communication, it is tested how much the received sound signal can recover the original sound signal. can do.

 In addition, according to the embodiment of FIG. 6, the Bluetooth wireless communication is performed from the Bluetooth module 112 of the first terminal 110 to the Bluetooth wireless communication from the time point received by the Bluetooth module 106 of the sound quality test apparatus 100. The temporarily generated call for communication may be approximated with the BT call of FIG. 3 (that is, the distortion generated in the step of transmitting and receiving the Bluetooth wireless communication is approximated). Therefore, when the distortion in the BT call according to the embodiment of FIG. 3 is approximately equal to the distortion in the process of transmitting and receiving the Bluetooth wireless communication in the embodiment of FIG. 6, the first terminal 110 determines the Bluetooth module 112. In the case of transmitting through Bluetooth wireless communication, the sound quality reflecting the distortion which may occur in the process of the MSM 114 controlling the Bluetooth module 112 may be tested.

Furthermore, according to the embodiment of Figure 6, when repeating the test while gradually increasing the distance between the sound quality test device 100 and the first terminal 110, the performance of the first terminal 110 according to the use radius The advantage is that it can be tested. More specifically, in the CDMA terminal 110 in which the Bluetooth module 112 is built, the sound quality may be tested by reflecting the transmission characteristics of the Bluetooth wireless communication according to the radius of use. In this case, an increase in the length of the cable 108 according to the radius of use should be considered, but in the case of minimizing the distortion caused by the cable, it is possible to simplify the sound quality test sufficiently reflecting the transmission characteristics of the Bluetooth wireless communication of the first terminal 110. .

FIG. 7 is an operational flowchart illustrating a test method in the embodiment of FIG. 6 in accordance with one preferred embodiment of the present invention. FIG.

Hereinafter, descriptions overlapping with those already described with reference to the exemplary embodiment of FIG. 6 will be omitted.

Referring to FIG. 7 in which the sound quality test method according to the embodiment of FIG. 6 is illustrated, the test signal generator 102 generates a test signal having a predetermined frequency (for example, 1 Khz) in step S710. In generating the test signal, the test signal generator 102 may add a recognition signal to enable the waveform analyzer 106 to recognize that the test signal starts before the test signal. The addition of the recognition signal may be performed before the generation of the test signal or after the generation of the test signal.

In step S720, the test signal is input to the waveform analyzer 106 for later comparison and analysis with the audio loopback signal (in which case, the input signal is referred to as an 'original sound signal') and is also provided for the sound quality test. 1 is input to the terminal (110).

In operation S730, the signal generated for the test in the first terminal 110 is looped back by the MSM 114 and transmitted from the Bluetooth module 112 to the Bluetooth wireless communication.

In step S740, the sound quality test apparatus 100 receives the signal transmitted through the Bluetooth wireless communication in step S730 through the Bluetooth wireless communication and inputs it to the waveform analyzer 106 (the signal input at this time is referred to as a 'receive tone signal').

In step S750, the waveform analyzer 106 compares and analyzes how much the received sound signal has recovered the original sound signal as an audio measurement parameter.

At this time, although not shown in Figure 7, the first terminal 110 from the Bluetooth module 112 to the Bluetooth wireless communication from the Bluetooth reception module 105 of the sound quality test device 100 from the time point to the Bluetooth wireless communication Approximating the temporarily generated call for the Bluetooth wireless communication up to the point of reception with the BT call of FIG. 3 (that is, identifying the distortion generated in the step of transmitting and receiving the Bluetooth wireless communication as an approximation), and FIG. 6 As described above, the MSM 114 controls the Bluetooth module 112 in a process in which the first terminal 110 transmits a signal generated for testing in the Bluetooth module 112 through Bluetooth wireless communication. The method may further include testing sound quality that reflects distortion that may occur in the PC.

In addition, while gradually increasing the distance between the sound quality test device 100 and the first terminal 110, the use radius (that is, the terminal 110) in the case of transmitting a signal generated for testing by Bluetooth wireless communication The method may further include repeating the sound quality test according to the radius of use.

In step S760, the comparison and analysis in the waveform analyzer 106 may be displayed on the display unit as visual information. Of course, the result of the comparative analysis may be transmitted to an external computer through the interface unit 103, coupled or provided with a storage device, or stored in a memory or output through an external output device (for example, a printer).

8 is an example of a sound quality test when transmitting and receiving by Bluetooth wireless communication between CDMA terminals having a Bluetooth module according to an embodiment of the present invention.

According to an embodiment, a first terminal 110 for transmitting a signal generated for a test via Bluetooth wireless communication and a second terminal 120 for receiving a Bluetooth wireless communication are provided.

The signals generated for the test by the test signal generator 102 are input to the waveform analyzer 106 (the input signals are called 'original sound signals'), and the interface unit 103 is used for the sound quality test. The cable 108 is input to the first terminal to minimize the distortion. Thereafter, a process of audio loopbacking the signal generated for the test in the MSM 114 of the first terminal to transmit the Bluetooth module 112 through the Bluetooth wireless communication is the same as described above in the embodiment of FIG.

In addition, the Bluetooth module 122 of the second terminal 120 receives the signal transmitted from the first terminal through the Bluetooth wireless communication, and the audio loop back from the MSM 124, the interface unit with a cable 109 for minimizing distortion The process of inputting the waveform analysis unit 106 through the 103 (the signal input at this time is referred to as a 'receiving signal') is the same as described above in the embodiment of FIG.

According to the embodiment of Fig. 8, how much the received sound signal can recover the original sound signal in the process of the signal generated for the test is transmitted and received by the Bluetooth wireless communication between the first terminal 110 and the second terminal 120. Can be tested with the audio measurement parameters described above.

In addition, according to the embodiment of FIG. 8, the Bluetooth wireless communication is performed from the time when the Bluetooth module 112 of the first terminal transmits the Bluetooth wireless communication to the time when the Bluetooth module 122 of the second terminal receives the Bluetooth wireless communication. For the sake of simplicity, the temporarily generated call can be approximated (ie, the degree of distortion is approximated) with the BT call in the embodiment of FIG. 3.

Therefore, except for the distortion in the BT call, the characteristics of the MSM 114 in the case of transmitting by Bluetooth wireless communication in the first terminal (that is, the MSM 114 in the case of transmitting by Bluetooth wireless communication is determined by the Bluetooth module). (Distortion generated in the process of controlling 112) can be compared with the characteristics of the MSM except for the distortion of the BT call in the embodiment of FIG.

Similarly, the characteristics of the MSM 124 in the case of receiving by the Bluetooth wireless communication in the second terminal (that is, in the case of receiving in the Bluetooth wireless communication, the MSM 124 in the process of controlling the Bluetooth module 122 The generated distortion) can be compared with the characteristics of the MSM except for the distortion of the BT call in the embodiment of FIG. 4.

Furthermore, according to the embodiment of Figure 8, when repeating the sound quality test while gradually increasing the distance between the first terminal 110 and the second terminal 120, the transmission and reception via Bluetooth wireless communication according to the user's use radius In this case, it is possible to test how much the received sound signal recovers the original sound signal.

In addition, according to the embodiment of FIG. 4 when the terminal receives the signal generated for the test via Bluetooth wireless communication according to the radius of use, and the embodiment of FIG. 6 when the Bluetooth wireless communication is transmitted, When the wireless communication is simultaneously transmitted and received, it is possible to test how the received sound signal recovers the original sound signal.

9 is a flowchart illustrating a sound quality test method in the embodiment of FIG. 8 according to an exemplary embodiment of the present invention.

Hereinafter, descriptions overlapping with the details already described will be omitted with reference to the exemplary embodiment of FIG. 9.

Referring to FIG. 9, in which the sound quality test method according to the embodiment of FIG. 8 is illustrated, in step S910, the test signal generator 102 generates a test signal having a predetermined frequency (for example, 1 Khz). In generating the test signal, the test signal generator 102 may add a recognition signal to enable the waveform analyzer 106 to recognize that the test signal starts before the test signal. The addition of the recognition signal may be performed before the generation of the test signal or after the generation of the test signal.

In step S920, the signal generated for the test is input to the waveform analyzer 106 in order to be compared and analyzed later with the audio loopback signal (in this case, the input signal is referred to as 'original sound signal'), and the sound quality test is also performed. Is input to the first terminal 110.

In step S930, the signal generated for the test is audio-looped back at the MSM 114 of the first terminal 110 and transmitted from the Bluetooth module 112 to the Bluetooth wireless communication.

In step S940, the signal transmitted from the first terminal is received by the Bluetooth module 122 of the second terminal 120 via Bluetooth wireless communication, the audio loopback by the MSM 124 to interface the interface unit 103 of the sound quality test apparatus The waveform analyzer 106 is input to the waveform analyzer 106 through the input signal.

In step S950, the waveform analyzer 106 compares and analyzes how much the received sound signal has recovered the original sound signal as an audio measurement parameter.

At this time, although not shown in FIG. 9, the Bluetooth module 112 of the first terminal 110 receives the Bluetooth wireless communication from the Bluetooth module 122 of the second terminal 120 from the time point at which the Bluetooth module 112 transmits the Bluetooth wireless communication. Approximating the call temporarily generated for the Bluetooth wireless communication with the BT call in the embodiment of FIG. 3 (ie, identifying the distortion generated in the step of transmitting and receiving the Bluetooth wireless communication as an approximation), and Characteristics of the MSM 114 in the case where the first terminal 110 transmits the Bluetooth wireless communication (that is, when the test signal is transmitted from the Bluetooth module 112 to the second terminal via the Bluetooth wireless communication, Distortion of the MSM 114 in the process of controlling the Bluetooth module 112 and distortion of the BT call in the embodiment of FIG. 6 (that is, in the process of transmitting and receiving in the Bluetooth wireless communication) The process of controlling the Bluetooth module 112 by the MSM 114 of the first terminal when transmitting a characteristic of the MSM (ie, distortion) except for distortion, from the Bluetooth module 112 to the sound quality test device via Bluetooth wireless communication. And a comparison test, and characteristics of the MSM 124 when the second terminal 120 receives the Bluetooth wireless communication (that is, the signal for the test transmitted by the Bluetooth wireless from the first terminal). (Distortion generated in the process of controlling the Bluetooth module 122 by the MSM 124 when the Bluetooth module 122 of the second terminal receives the Bluetooth wireless) MSM excluding the distortion of the BT call in the embodiment of FIG. Characteristics (when the Bluetooth module 122 of the second terminal receives a signal for a test transmitted by the Bluetooth wireless communication from the sound quality test apparatus 110, the MSM 122 is the Bluetooth module 122 ) And a comparison test.

Further, while gradually increasing the distance between the first terminal 110 and the second terminal 120, it may include the step of repeating the sound quality test according to the radius of use.

In step S960, the result of the comparison and analysis in the waveform analyzer 106 may be displayed on the display as visual information. Of course, the result of the comparison and analysis may be transmitted, coupled or provided to an external computer through the interface unit 103. The data may be stored in a storage device, a memory, or output through an external output device (for example, a printer).

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

As described above, according to the preferred embodiment of the present invention, there is an advantage in that a sound quality test for a voice signal and an MP3 file is possible in a terminal having a short-range mobile communication module.

In addition, according to a preferred embodiment of the present invention, there is an advantage that it is possible to simplify the performance test of the Bluetooth wireless communication according to the operator's use area.

In addition, according to a preferred embodiment of the present invention, there is an advantage that the call quality test according to the radius of use of the terminal can be simplified.

In addition, according to a preferred embodiment of the present invention, there is an advantage that the voice call quality in the CDMA terminal with the Bluetooth wireless communication module can be simplified.

Claims (3)

Generating a test signal having a predetermined frequency and transmitting the test signal to a mobile communication terminal through a short range wireless communication method or a cable; And And calculating an audio measurement parameter value by using the test signal and the audio loopback signal when the audio loopback signal is input from the mobile communication terminal through a short range wireless communication scheme or a cable. The method of claim 1, And displaying the audio measurement parameter value as visual information through a display unit. The method of claim 1, The short range wireless communication method is a sound quality test method of a terminal, characterized in that the Bluetooth communication method.

Images