JP2015195446A - Portable reading apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration capable of emitting a notification sound and a received voice from a common speaker, emphasizing a sound at a specific frequency easily to listen and easily maintaining a speech quality when emitting the received voice.SOLUTION: A portable reading apparatus 1 includes a sound generation section. When a received voice signal is inputted, a voice obtained by converting the received voice signal is generated from a speaker 60 and when a notification sound signal is inputted, a notification sound obtained by converting the notification sound signal is generated from the speaker 60. A resonator 70 is then disposed in a route for emitting the sound from the speaker 60 to the outside of a case. The resonator 70 is configured to emphasize a sound at a specific frequency included in the notification sound when the notification sound is generated from the speaker 60.

Description

  The present invention relates to a portable reader.

  A portable reader such as a portable code reader is required to perform various notifications to the user, and generally transmits various information by sound from a speaker. As this type of technology, for example, there is one as disclosed in Patent Document 1, and in the mobile communication terminal disclosed in Patent Document 1, the speaker unit 12 is provided on the back side of the case 2, and sound emitted from the speaker is obtained. Has been devised in order to better communicate to the user.

JP 2010-178065 A

  In conventional portable readers used for industrial purposes, it was only necessary to be able to notify the reading results, etc., so the number of scales of the notification sound does not have to be so large, and it is suitable for its use in consideration of space, cost, etc. A simple structure was adopted. However, due to the recent advancement of high functionality, it is assumed that a telephone function is installed in an apparatus for industrial use as well. In this case, the situation differs from the above-described sounding of the notification sound. It is required to utter the received voice at the time of use with the highest possible quality.

  As described above, when it is assumed that both the notification sound and the reception voice are emitted from the device, the notification sound is specified to be transmitted to the user more reliably even in a somewhat noisy environment. It is desirable to output in a form that emphasizes the sound of the frequency, and for the received voice, it is difficult to maintain proper call quality if only the vicinity of a specific frequency is emphasized. It can be said that it can be realized. As a sound source configuration satisfying such requirements, a configuration in which a dedicated sound source (buzzer or the like) suitable for notification sound and a speaker for performing a call are provided separately can be considered. If they are provided separately, an increase in the number of components and an increase in the size of the apparatus are inevitable, and this is a major disadvantage in a portable apparatus that requires a small and lightweight structure.

  The present invention has been made to solve the above-described problem, and in a portable reader equipped with a telephone function, a notification sound and a reception voice can be emitted from a common speaker, and a notification sound is emitted. It is an object of the present invention to provide a configuration in which sound of a specific frequency can be emphasized so that it can be easily heard, and the call quality is easily maintained when receiving a received voice.

The present invention includes a reading unit that reads a reading target;
A case in which the reading unit is assembled;
A received voice signal generating unit that is assembled to the case and receives a call signal coming from outside the case via electromagnetic waves and generates a received voice signal;
A notification sound signal generator for generating a notification sound signal;
A speaker that generates a sound, and the reception voice signal generated by the reception voice signal generation unit and the notification sound signal generated by the notification sound signal generation unit can be input, and the reception voice signal A sound generating unit that generates a sound obtained by converting the received sound signal from the speaker when the sound is input, and generates a notification sound obtained by converting the notification sound signal from the speaker when the notification sound signal is input;
A resonator that is disposed in a path that emits sound from the speaker to the outside of the case, and that causes the notification sound to resonate when the notification sound is generated by converting the notification sound signal from the speaker;
Have
The sound generation unit generates the notification sound including a sound having a resonance frequency in the resonator when the notification sound signal is input.

According to the first aspect of the present invention, the sound generation unit can input the reception voice signal generated by the reception voice signal generation unit and the notification sound signal generated by the notification sound signal generation unit. When a signal is input, a sound obtained by converting the received sound signal is generated from the speaker, and when a notification sound signal is input, a notification sound obtained by converting the notification sound signal is generated from the speaker. With such a configuration, it is possible to generate a notification sound and a received voice from a common speaker while realizing a portable reader device equipped with a telephone function.
In addition, a resonator is arranged in a path for emitting sound from the speaker to the outside of the case, and when the notification sound signal is input, the sound generation unit outputs the notification sound including the resonance frequency sound in the resonator. It is the structure to generate. In this way, when the notification sound is generated, the sound of the frequency can be emphasized by the resonator, so that the notification sound can be made easier to hear. On the other hand, regarding the received voice, it is assumed that sounds of various frequencies are mixed, and the received quality is easily maintained unless the sound is too biased to the sound of the resonance frequency.

  According to a second aspect of the present invention, in the resonator, one end portion is configured as an opening facing the speaker side and is connected to the first cylindrical portion configured in a cylindrical shape and the other end portion of the first cylindrical portion. In addition, there is provided a second cylindrical portion that communicates with the first cylindrical portion and has a diameter smaller than that of the first cylindrical portion. According to this configuration, a resonator capable of emphasizing a specific frequency sound can be realized with a simple and small structure in a case of a portable reader device having a large space restriction.

According to a third aspect of the present invention, a closing member that closes the second cylindrical portion is disposed on the end side of the second cylindrical portion opposite to the first cylindrical portion. According to this configuration, foreign substances such as water can be prevented from entering the resonator, and the components in the apparatus can be protected. And since the 1st cylindrical part with a small diameter is arrange | positioned on the outer side, the diameter of the entrance vicinity into which foreign materials, such as water, may enter can be restrained small, and the area to block | close can also be restrained small. . In other words, the structure whose diameter is narrowed for resonance also contributes to protect the blocking member. While realizing a configuration capable of resonance at a specific frequency, the foreign material is less likely to enter and has a strong force (foreign material). Or a direct stress due to impact or the like) can be realized.
On the other hand, in the configuration that blocks the sound path of the speakers as described above, the sound pressure level must be reduced accordingly, and thus the sound pressure of the notification sound that requires generation of a loud sound is particularly problematic. It becomes. On the other hand, in the present invention, since the sound of the specific frequency included in the notification sound is emphasized, even if there is a decrease in sound pressure due to the blockage, the enhancement that compensates for at least part or all of the decrease in sound pressure Therefore, the notification sound can be easily heard.

In a fourth aspect of the present invention, when the received voice signal is input, the sound generation unit corrects the sound pressure of the sound of the predetermined frequency of the received voice signal and generates the corrected received voice signal from the speaker. It has become.
In this configuration, when the notification sound is generated, the notification sound can be made easier to hear by enhancing the sound near the resonance frequency included in the notification sound by the resonator. However, when using a resonator, due to the effect, the unevenness of the waveform indicating the reception frequency characteristic tends to be large, and the sound pressure at a specific frequency becomes too large or too small, resulting in a decrease in call quality. However, in this configuration, when a received voice signal is input to the sound generator, the sound pressure level at least at a predetermined frequency can be corrected. Become.

FIG. 1 is a side partial cross-sectional view schematically illustrating the portable reading device according to the first embodiment. FIG. 2 is a block diagram illustrating an electrical configuration of the portable reading device of FIG. FIG. 3 is a block diagram specifically illustrating the electrical configuration of the control circuit, communication unit, sound control unit, and the like of the portable reading device of FIG. FIG. 4 is an explanatory diagram schematically illustrating an external network configuration when the telephone function and the communication function are used in the portable reading device of FIG. FIG. 5 is an enlarged sectional view showing a part of the longitudinal section of the portable reading device of FIG. FIG. 6 is a graph showing an example of reception frequency characteristics when digital correction processing is not performed. FIG. 7 is a graph showing an approximate waveform obtained by approximating the waveform in the frequency region to be suppressed, and a waveform obtained by decomposing the approximate waveform into a plurality of components, among the waveforms of the reception frequency characteristics shown in FIG. FIG. 8 is a table showing the relationship between the center frequency, Q value, and gain of each component shown in the graph of FIG. FIG. 9 is a graph showing the basic waveform shown in FIG. 6 (an example of a reception frequency characteristic when digital correction processing is not performed) and an antiphase waveform for performing digital correction. FIG. 10 is a graph illustrating the reception frequency characteristic after digital correction is performed on the structure having the reception frequency characteristic as shown in FIG. 6 when digital processing is not performed. FIG. 11 is a graph showing an example of the sound pressure frequency characteristic when the resonator is not used, with respect to the speaker used in the portable reader of FIG. FIG. 12 is a graph showing sound pressure frequency characteristics when a speaker having the characteristics shown in FIG. 11 is used with a resonator as shown in FIGS.

[First embodiment]
Hereinafter, a first embodiment embodying the present invention will be described with reference to the drawings.
(Outline of portable reader)
As shown in FIG. 1, the portable reading device 1 according to the first embodiment has a longitudinal appearance, and a half region on one end side in the longitudinal direction is a gripping region, and is used while being gripped by a user. The structure is made. The portable reader 1 is configured as a portable information code reader that is carried by a user and used in various places, for example, and receives an information code C (see FIG. 2) such as a barcode or a two-dimensional code. It has a reading function.

  As shown in FIG. 1, the portable reader 1 has an outer case formed by a longitudinal case 10 formed by assembling an upper case 10a and a lower case 10b formed of a synthetic resin material such as ABS resin. ing. This case 10 has an operation switch 42 (for example, a function key, a numeric keypad, etc.) operated when inputting predetermined information on the upper case 10a side, and a display unit (for example, as shown in FIG. 2) for displaying predetermined information. The control circuit 40 that functions as a reading unit, the communication unit 44 that functions as a received voice signal generation unit, and the like are assembled therein.

  In this specification, the thickness direction of the portable reader 1 is the vertical direction, and in the example of FIG. 1 and the like, the direction perpendicular to the outer surface of the display unit (liquid crystal display 43) is the vertical direction. Further, a predetermined direction orthogonal to the vertical direction is defined as the front-rear direction, and in the example of FIG. Moreover, the direction orthogonal to the up-down direction and the front-back direction is the left-right direction. In the example of FIG. 1 and the like, the vertical direction is the Y-axis direction, the upper side is the Y-axis positive side, and the lower side is the Y-axis negative side. The front-rear direction is the X-axis direction, the front side is the X-axis positive side, and the rear side is the X-axis negative side. The left-right direction is the Z-axis direction.

  As shown in FIG. 2, the portable reader 1 mainly includes an optical system such as an illumination light source 21, a light receiving sensor 23, a filter 25, and an imaging lens 27, a memory 35, a control circuit 40, an operation switch 42, and a liquid crystal. The display unit 43 includes a microcomputer (hereinafter referred to as “microcomputer”) system and a power supply system such as a power switch 41 and a battery 49. These are mounted on a printed wiring board or housed in a case 10 shown in FIG.

  The optical system includes an illumination light source 21, a light receiving sensor 23, a filter 25, an imaging lens 27, and the like. The illumination light source 21 functions as an illumination light source capable of emitting the illumination light Lf, and includes, for example, a red LED and a diffusion lens, a condensing lens, and the like provided on the emission side of the LED. In this configuration, for example, the illumination light sources 21 are provided on both sides of the light receiving sensor 23, and the illumination light Lf can be irradiated toward the reading object R through a reading port (not shown) formed in the case. It is configured.

  As the reading object R, for example, various objects such as a resin material and a metal material can be considered, and the information code C formed by printing, direct marking or the like on the reading object R can be read. It has become. Further, the reading object R may be a display device such as a liquid crystal display, and an information code displayed on such a display device can also be read. The information code C to be read may be a QR code (registered trademark), a data matrix code, a maxi code, other two-dimensional codes, or a one-dimensional code such as a barcode.

  The light receiving sensor 23 is configured to be able to receive the reflected light Lr irradiated and reflected on the reading object R and the information code C. For example, the light receiving element 23 is a solid-state image pickup device such as a C-MOS or CCD. An area sensor arranged in a dimension corresponds to this. The light receiving sensor 23 is configured to receive incident light incident through the imaging lens 27 by the light receiving surface 23a, and is mounted on, for example, a printed wiring board.

  The filter 25 is an optical low-pass filter that allows passage of light that is less than or equal to the wavelength of the reflected light Lr and blocks passage of light that exceeds the wavelength, and a reading port (not shown) formed in the case. It is provided between the imaging lens 27. Thereby, unnecessary light exceeding the wavelength equivalent of the reflected light Lr is prevented from entering the light receiving sensor 23. In addition, the imaging lens 27 includes, for example, a lens barrel and a plurality of condensing lenses housed in the lens barrel. In this configuration, the imaging lens 27 is incident on a reading port (not shown) formed in the case. The reflected light Lr is condensed, and a code image of the information code C is formed on the light receiving surface 23 a of the light receiving sensor 23.

  The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, an operation switch 42, a liquid crystal display 43, a communication unit 44, and a sound control unit 50. Etc. are constituted. This microcomputer system is configured around a control circuit 40 and a memory 35 that can function as a microcomputer (information processing apparatus), and the image signal of the information code C imaged by the optical system described above is signaled in hardware and software. It can be processed.

  An image signal (analog signal) output from the light receiving sensor 23 of the optical system is amplified by a predetermined gain by being input to the amplification circuit 31, and then input to the A / D conversion circuit 33, and is converted from the analog signal to the digital signal. Is converted to The digitized image signal, that is, image data (image information) is input to the memory 35 and stored in the image data storage area of the memory 35. The synchronization signal generation circuit 38 is configured to generate a synchronization signal for the light receiving sensor 23 and the address generation circuit 36. The address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. Thus, the storage address of the image data stored in the memory 35 can be generated.

  The memory 35 is configured by a known storage device such as a RAM, a ROM, and a nonvolatile memory. In addition to the above-described image data storage area, the RAM of the memory 35 is configured so as to be able to secure a work area, a reading condition table, and the like that are used by the control circuit 40 at each processing such as arithmetic operation and logical operation. Yes. The ROM stores a predetermined program capable of executing reading processing and the like, and a system program capable of controlling each hardware such as the illumination light source 21 and the light receiving sensor 23.

  The control circuit 40 is a microcomputer that can control the portable reading device 1 as a whole, and includes a CPU, a system bus, an input / output interface, and the like, and has an information processing function. Various input / output devices (peripheral devices) are connected to the control circuit 40 via a built-in input / output interface. In the case of this configuration, the power switch 41, the operation switch 42, the liquid crystal display 43, the communication The unit 44, the sound control unit 50, and the like are connected.

  The communication unit 44 includes, for example, a communication device that performs communication according to a known wireless communication standard such as WWAN (Wireless Wide Area Network), WLAN (Wireless Local Area Network), and WPAN (Wireless Personal Area Network). It is configured as an interface for data communication and voice calls. Examples of WWAN include mobile communication networks such as cellular, UMTS, GPRS, CDMA2000, GSM, CDPD, Mobitex, HSDPA, 3G, WiMax, and the like, as long as they can be connected to at least one of these networks. Examples of the WLAN include a wireless LAN network such as a Wi-Fi network. Moreover, as WPAN, Bluetooth communication etc. are mentioned. The communication unit 44 may include a wired communication interface that performs wired communication according to a known serial communication standard or parallel communication standard via a cable. The communication unit 44 configured as described above is configured to be able to transmit, for example, decoded information code C data to an external device or receive information from the external device. In addition, other data transmission / reception and transmission / reception of audio signals when using the telephone function are performed.

  The power supply system includes a power switch 41, a battery 49, and the like. When the power switch 41 managed by the control circuit 40 is turned on and off, the conduction of the drive voltage supplied from the battery 49 to each device and each circuit described above is established. Or shut off is controlled. The battery 49 is a secondary battery that can generate a predetermined DC voltage, and corresponds to, for example, a lithium ion battery.

  In this configuration, the information code C corresponds to the reading target. Further, the control circuit 40 corresponds to an example of a reading unit and functions to read the information code C to be read. Specifically, the information code C is imaged by the light receiving sensor 23 and the image is captured. When the code image is stored in the memory 35, it functions to analyze the code image and decode the data recorded in the information code C by a known decoding method.

(Basic composition for pronunciation)
Next, a basic configuration for pronunciation will be described.
A portable reader 1 shown in FIG. 1 and the like has a function for generating a notification sound prepared in advance in the apparatus and a function for generating a received voice from an external device. Can be emitted by a common speaker 60.

  Specifically, as shown in FIG. 3, as a part of the communication unit 44, for example, a communication interface 44b for performing communication in accordance with a wireless WAN (WWAN) standard and an antenna 44a used by the communication interface 44b are provided. The telephone communication and the Internet communication can be performed in the same manner as a known mobile phone or smartphone. Specifically, the communication unit 44 can communicate with the base station 101 (FIG. 4) installed in various places by emitting electromagnetic waves from the antenna 44a and receiving electromagnetic waves by the antenna 44a. Thus, it is possible to connect to a wide area data communication network (WWAN) by wireless communication.

  An example of a wide area data communication network (WWAN) by wireless communication is a network as shown in FIG. In this network, each base station 101 is connected to a radio network controller 103 (RNC), and this radio network controller 103 is connected to a subscriber packet switch 105. The subscriber packet switch 105 is connected to the relay packet switch 109, and the relay packet switch 109 is connected to the Internet communication network via a gateway (not shown). The radio network controller 103 is connected to a subscriber exchange 107, which is connected to a relay exchange 111. The relay exchange 111 is connected to a public switched telephone network (PSTN) via a gateway exchange (not shown). With such a network configuration, both data communication using the Internet network and voice communication using a public switched telephone network are possible. Note that the example shown here is merely an example, and various other known configurations can be used as long as the configuration allows data communication with an external device and the configuration allows communication with the external device.

  As shown in FIG. 3, in the portable reader 1, various commands and data are transmitted and received between the communication interface 44 b and the control circuit 40. On the other hand, the received voice signal (analog signal) is input to the sound control unit 50 via a predetermined terminal (LINE IN) of the sound control unit 50 without passing through the control circuit 40, for example. The sound control unit 50 includes an AD converter 51 that converts a received voice signal (analog signal) from the communication interface 44b into a digital signal, a changeover switch 53 that switches a signal input path, and a correction unit 55 that performs correction processing described later. And. Furthermore, a DA converter 57 that converts the notification sound signal and the received voice signal into an analog signal, and an amplifier 59 that amplifies the analog signal (sound signal) converted by the DA converter 57 are provided. The amplifier 59 is connected to a speaker 60 that converts the sound signal amplified by the amplifier 59 into sound and outputs the sound. The speaker 60 is configured as a dynamic speaker having a high rated power, for example, and can output a buzzer sound or the like satisfactorily.

  In the portable reader 1 configured as described above, when a notification sound is generated, a notification sound signal is output from the control circuit 40 to the sound control unit 50. When the notification sound signal is output, the changeover switch 53 is switched by the control circuit 40 so that the notification sound signal from the control circuit 40 side is input. In this case, the notification sound signal input from the control circuit 40 is input to the DA converter 57 via the changeover switch 53 and the correction unit 55 and converted into an analog signal, and the analog signal (notification sound) is output from the speaker 60. A sound obtained by converting a signal obtained by converting the signal by the DA converter 57 is emitted. When the notification sound signal is input from the control circuit 40, the correction processing by the correction unit 55 is not performed, and the notification sound signal input from the control circuit 40 is converted into an analog signal by the DA converter 57, and the sound signal is converted into the sound signal. Based on this, a notification sound is emitted from the speaker 60.

  The portable reader 1 is prepared with one or more notification sounds in advance. The notification sound signal is a digital signal determined in advance to generate a buzzer sound of a predetermined scale or a predetermined melody as the notification sound, and is stored in the memory 35 in advance. For example, when the information code C is successfully read, the control circuit 40 outputs a first notification sound signal (digital signal) for generating a first notification sound indicating that the information code C has been successfully read. In this case, the speaker 60 generates a sound (success sound) obtained by converting the first notification sound signal. Further, for example, when an error occurs in reading the information code C, a second notification sound signal (digital signal) for generating a second notification sound indicating an error is output from the control circuit 40. In this case, the speaker From 60, a sound (error sound) obtained by converting the second notification sound signal is emitted. Note that the types of notification sounds shown here are merely examples, and various notification sounds can be used as long as the sounds notify the user of the occurrence of the predetermined state.

  The portable reader 1 transmits a predetermined signal from the communication interface 44b to the control circuit 40 during a call, and the control circuit 40 inputs a digital signal from the AD converter 51 according to the predetermined signal. In this way, control for switching the changeover switch 53 is performed. That is, during a call, a received voice signal from the communication unit 44 is input to the correction unit 55 via the AD converter 51 and the changeover switch 53.

  When receiving a received voice and emitting from the speaker 60, first, an external received voice signal (for example, an analog signal obtained from a received radio wave) received by the antenna 44a is input to the AD converter 51 by the communication interface 44b. . The received voice signal (analog signal) input to the AD converter 51 in this way is converted into a digital signal by the AD converter 51. The received voice signal converted into a digital signal by the AD converter 51 is subjected to correction processing (digital correction processing) described later by the correction unit 55, and the corrected received voice signal is input to the DA converter 57. The signal is converted into an analog signal and then amplified by an amplifier 59. Then, the speaker 60 emits a sound obtained by converting the amplified analog signal (a signal obtained by converting the corrected received voice signal by the DA converter 57 and amplified by the amplifier 59).

  In this configuration, the communication interface 44b corresponds to an example of a received voice signal generation unit, and functions to receive a call signal coming from outside the case 10 through electromagnetic waves as a medium and generate a received voice signal. The control circuit 40 corresponds to an example of a notification sound signal generation unit. For example, the control circuit 40 reads data (data of the notification sound signal) stored in the memory 35 and generates the notification sound signal as an electrical signal (digital signal). To function.

  The sound control unit 50 and the speaker 60 correspond to an example of a sound generation unit. The sound control unit 50 and the speaker 60 include the speaker 60 that generates sound, and are generated by the reception voice signal generated by the reception voice signal generation unit and the notification sound signal generation unit. When a received sound signal is input, a sound obtained by converting the received sound signal is generated from the speaker 60, and when the received sound signal is input, the received sound signal is converted. The generated notification sound functions from the speaker 60.

(Enhancement by resonator and correction processing)
Next, the resonator 70 and the correction process will be described.
The resonator 70 shown in FIGS. 1, 5, etc. is configured as a Helmholtz resonator, for example, and is disposed in a path for emitting sound from the speaker 60 to the outside of the case 10. As shown in FIG. 5, the resonator 70 includes a first cylindrical portion 71 having a relatively large diameter and a second cylindrical portion 72 having a relatively small diameter. The first cylindrical portion 71 is configured as an opening having one end portion 71a facing the speaker side (speaker 60 side) and has a hollow cylindrical shape inside, and the other end portion 71b faces upward. It is the structure which opened toward. The second cylindrical portion 72 is connected to the other end portion 71b of the first cylindrical portion 71 and communicated with the first cylindrical portion 71. The second cylindrical portion 72 also has an internal structure. It has a hollow cylindrical shape in the form of a cavity. In the resonator 70, for example, the vertical length of the first cylindrical portion 71 is about 4.6 mm, and the vertical length of the second cylindrical portion 72 is about 5.0 mm. Yes. Moreover, the distance from the upper end part of the sound emission hole 13 to the upper end part of the 2nd cylindrical part 72 is about 2.0 mm.

  As shown in FIGS. 1 and 5, the resonator 70 is disposed near the upper surface of the case 10 at a position on one side in the longitudinal direction of the case 10 (near the front end that is the positive side in the X-axis direction). A closing member 80 (described later) and an internal space region of the second cylindrical portion 72 are positioned at a position directly below the sound emitting hole 13 formed in the upper surface portion of the case 10. Specifically, it is adjacent to the liquid crystal display 43 and is disposed on one side in the longitudinal direction of the liquid crystal display 43 (the front end side of the case 10), and the first cylindrical portion 71 is arranged on the liquid crystal display 43. The second cylindrical portion 72 is disposed adjacent to the front side of the transparent plate (LCD plate) 43a that covers the LCD panel 43b. A waterproof seal 11 is sandwiched between the upper case 10a and the lower case 10b to prevent water and the like from entering between the cases.

  A closing member 80 is arranged on the end side opposite to the first tubular portion 71 in the second tubular portion 72 so as to close the end portion (the upper end portion of the second tubular portion 72). . The closing member 80 is made of, for example, a known resin material and functions as a waterproof sheet, and prevents foreign matter (water or the like) entering from the outside of the case 10 from entering the resonator 70.

  The resonator 70 configured as described above is resonant by adjusting the shape of the internal space of the first cylindrical portion 71 and the shape of the internal space of the second cylindrical portion 72 according to the principle of the Helmholtz resonator. The frequency can be set. That is, the resonance frequency is adjusted by adjusting the volume V0 of the area AR1 configured with a large diameter, the radius r of the inner peripheral surface (cylindrical surface) of the area AR2 configured with a small diameter, and the length l in the vertical direction. It can be adjusted to a desired frequency. Note that the area AR2 is S2 in which the cross-sectional area at the cutting plane orthogonal to the vertical direction is substantially constant in the entire vertical direction, and the area AR1 is the entire cross-sectional area at the cutting plane orthogonal to the vertical direction in the vertical direction. It is larger than S2. As described above, the resonator 70 has a cross-sectional area at the cutting plane orthogonal to the vertical direction in the entire vertical direction of the region AR2 configured with the narrow opening shape, whichever direction in the vertical direction of the region AR1 configured with the wide opening shape. It is smaller than the sectional area of the position (cut surface perpendicular to the vertical direction).

  The resonator 70 functions to resonate the notification sound when a notification sound (such as a buzzer sound) obtained by converting the notification sound signal described above is generated in the speaker 60. That is, in the sound control unit 50 and the speaker 60 corresponding to the sound generation unit, when a notification sound signal is input from the control circuit 40 to the sound control unit 50, a notification sound including a sound of a specific frequency (for example, a buzzer sound). ) Is emitted from the speaker 60, and this “specific frequency” is a resonance frequency in the resonator 70. The specific frequency is not particularly limited, but is 3.65 kHz, for example. The sound pressure frequency characteristic when the speaker 60 and the resonator 70 are used as shown in FIGS. 1 and 5 is, for example, a broken line waveform in FIG. 12, and in this example, the sound near the resonance frequency of 3.65 kHz. The pressure level is emphasized to be the highest.

  On the other hand, in the portable reading device 1 of this configuration, an external device is used during a call with an external device (not shown) (for example, a known telephone device such as a fixed telephone, a mobile phone, and a smartphone, or an external device similar to the reading device 1). 4 is received by the antenna 44a via the circuit network illustrated in FIG. 4 and input as a received voice signal from the communication interface 44b to the sound control unit 50. Before the input, the input path at the selector switch 53 is switched to the AD converter 51 side. Then, the digital signal obtained by converting the input received voice signal by the AD converter 51 is input to the correction unit 55 via the changeover switch 53. Then, the correction unit 55 performs a correction process (digital correction process) on the received voice signal (digital signal), and performs a process of correcting the sound pressure of at least a predetermined frequency sound on the received voice signal (digital signal). In addition, a sound obtained by converting the corrected received voice signal is generated from the speaker 60. The correction unit 55 only needs to be configured to change the frequency characteristics of the digital audio signal, and has the same function as a known equalizer. One or a plurality of predetermined audio signals are input to the input audio signal. Various known methods can be used as long as the configuration can enhance or suppress the predetermined frequency band.

  Specifically, the reception frequency characteristic of the reception voice signal before correction is as shown by a characteristic curve F1 in FIG. In FIG. 6, the speaker 60 and the resonator 70 in the case where the reception voice signal converted by the AD converter 51 is directly DA-converted by the DA converter 57 and the reception voice is emitted from the speaker 60 without correction by the correction unit 55. It is a graph which shows the receiving frequency characteristic by. As shown in this graph, when the correction unit 55 does not perform correction, the sound pressure level at the predetermined frequency (A part) exceeds the specified upper limit level S1, and at another predetermined frequency (B part). Since the sound pressure level is lower than the prescribed lower limit level S2, it is unavoidable that the call quality deteriorates. Thus, in this configuration, the sound pressure of a predetermined frequency that is assumed to deviate from the upper limit level S1 and the lower limit level S2 is corrected in this way. In this specification, the reception frequency characteristic of the telephone call quality standard defined by the Information and Communication Network Industries Association (CIAJ) is used as the reception frequency characteristic, and the upper limit level S1 and the lower limit level S2 are the information communication network. The allowable limit in the reception frequency characteristic according to the telephone call quality standard defined by the Industrial Association (CIAJ) is shown. The upper limit level S1 indicates the upper limit of the allowable limit, and the lower limit level S2 indicates the lower limit of the allowable limit. Is shown. The method of measuring the reception frequency characteristic conforms to the telephone call quality standard defined by the Information and Communication Network Industries Association (CIAJ), and specifically conforms to the ITU-T recommendation. The method for determining the upper limit level S1 and the lower limit level S2 is not limited to this example. Note that the acoustic characteristics of the receiver are different from the acoustic characteristics of the speaker because they are applied to the ears and are also suppressed in driving power. That is, the sound pressure frequency characteristics as shown in FIGS. 11 and 12 and the reception frequency characteristics as shown in FIGS. 6 and 10 have different concepts and different measurement methods.

  The characteristic curves of the peaks and valleys (A part and B part) that are too emphasized in the characteristic curve F1 of FIG. 6 (the reception frequency characteristics of the speaker 60 and the resonator 70 when the correction unit 55 does not perform correction) are shown in FIG. It can be approximated as shown by a thick solid line curve F2 shown in FIG. Therefore, if a composite waveform F3 (FIG. 7) having an inverted phase in which the polarity of the signal of the composite waveform F2 is inverted and the waveform of the characteristic curve F1 are combined, peaks and valleys (A part and B part) that are overemphasized. ) Portion can be smoothed. Specifically, the thick solid line curve F2 (approximate curve) can be considered as a combined waveform of the components (component 1, component 2, component 3) of the bandpass filter as shown in FIGS. Accordingly, the thick solid line curve F2 (approximate curve) approximating the peak and valley portions to be erased is decomposed into a plurality of bandpass filter components (component 1, component 2, component 3), and these components are cut (specifically) Specifically, if the correction unit 55 performs the filter processing for synthesizing the antiphase waveforms of the components 1, 2, and 3), the vicinity of the peaks and valleys (A and B portions) that are overemphasized is used. Correction for smoothing becomes possible.

  As described above, in the correction unit 55, when a reception voice signal is input, the input reception voice signal (digital signal obtained by digitizing the reception voice) is input in one or a plurality of predetermined frequency bands. Filter processing is performed so as to suppress or enhance the sound pressure level at a predetermined degree. Since such a correction is made, if the digital voice signal has characteristics as shown in FIGS. 6 and 9 (a received voice signal before correction having a reception frequency characteristic such as a characteristic curve F1), as shown in FIG. The correction can be performed so as to suppress the convex part of the A part and the concave part of the B part, and the sound pressure level is within the allowable range for the frequency band of the A part and the B part as shown by the characteristic curve F1 ′ in FIG. It will be able to fit. Even if the received voice signal is different from that shown in FIGS. 6 and 9, the emphasis is on the peaks and valleys that are too emphasized due to the configuration of the apparatus. By performing the correction, it is possible to prevent the peaks and valleys of the A part and the B part from being emphasized too much.

(Main effects of this configuration)
In this configuration, in the sound control unit 50 that forms part of the sound generation unit, the received voice signal generated by the received voice signal generation unit and the notification sound signal generated by the notification sound signal generation unit can be input. When a received voice signal is input, a sound obtained by converting the received voice signal is generated from the speaker 60, and when a notification sound signal is input, a notification sound obtained by converting the notification sound signal is generated from the speaker 60. It has a configuration. With this configuration, it is possible to generate the notification sound and the reception voice from the common speaker 60 while realizing the portable reader 1 equipped with the telephone function. As a result, the number of parts can be reduced as compared with the case where a dedicated speaker is provided for each, and in the portable reader 1 where space restrictions are large due to demands for miniaturization and weight reduction, also in terms of space. Become advantageous.

  Furthermore, a resonator 70 is disposed in a path for releasing sound from the speaker 60 to the outside of the case, and the sound generation unit, when a notification sound signal is input, notifies that the sound of the resonance frequency in the resonator 70 is included. It is configured to generate sound. In this way, when the notification sound is generated, the sound of the frequency can be emphasized by the resonator 70, so that the notification sound can be made easier to hear.

  The resonator 70 is provided with a first cylindrical portion 71 and a second cylindrical portion 72, and the first cylindrical portion 71 is configured as an opening with one end portion 71a facing the speaker 60 side. The second cylindrical portion 72 is connected to the other end portion 71 b of the first cylindrical portion 71 and communicates with the first cylindrical portion 71, and the first cylindrical portion 71. The diameter is smaller than that. According to this configuration, the resonator 70 that can emphasize the sound of a specific frequency can be realized with a simple and small structure in the case 10 of the portable reader 1 with a large space restriction.

In addition, a closing member 80 that closes the second tubular portion 72 is disposed on the end side of the second tubular portion 72 opposite to the first tubular portion 71. According to this configuration, foreign substances such as water can be prevented from entering the resonator 70, and the components in the apparatus can be protected. In addition, since the first cylindrical portion 71 having a small diameter is disposed on the outside, the diameter near the entrance where foreign substances such as water can enter can be reduced, and the area to be blocked can also be reduced. it can. That is, it is possible to realize a configuration in which a foreign substance is less likely to enter and a strong force (direct stress due to a foreign matter or an impact) is not easily applied to the closing member 80 while realizing a configuration capable of resonating at a specific frequency.
On the other hand, in the configuration in which the sound path from the speaker 60 is blocked in this way, the sound pressure level has to be lowered accordingly, so that the sound pressure of the notification sound that is particularly required to generate a loud sound is reduced. It becomes a problem. On the other hand, in this configuration, since the sound of the specific frequency included in the notification sound is emphasized, even if there is a decrease in sound pressure due to blockage, at least a part of or all of the decrease in sound pressure is emphasized. Therefore, the notification sound can be easily heard.

  For example, FIG. 11 is a graph showing sound pressure frequency characteristics when the speaker 60 used in the portable reader 1 of FIG. 1 is used alone, and FIG. 12 is like the portable reader 1 of FIG. 6 is a graph showing sound pressure frequency characteristics when the resonator 70 and the closing member 80 are used. In FIG. 11, when the speaker 60 is used alone, the upper limit value of the sound pressure level for each frequency is indicated by a solid line, and the lower limit value of the sound pressure level for each frequency is indicated by a two-dot chain line. Further, the center value of the sound pressure level for each frequency is indicated by a one-dot chain line. In FIG. 12, the upper limit value of the sound pressure level for each frequency in the configuration of FIGS. 1 and 5, that is, when the speaker 60 and the resonator 70 are used is indicated by a solid line. The lower limit value is indicated by a one-dot chain line. Further, the center value of the sound pressure level for each frequency is indicated by a broken line. In any case, the sound pressure frequency characteristic is measured in accordance with JIS, and in these examples, the waveform of the center value is treated as the sound pressure frequency characteristic. In the comparative example of FIG. 11, the sound pressure level at 3.65 kHz which is the ringing frequency of the notification sound is about 93 dB, whereas in the embodiment of FIG. 12, even when the closing member 80 is used, The sound pressure level at 3.65 kHz, which is the ringing frequency (resonance frequency) of the notification sound, is approximately 96 dB, which greatly exceeds the comparative example. Thus, the sound pressure level can be emphasized so as to compensate for the sound pressure drop caused by the closing member 80, and the sound pressure level near the ringing frequency can be increased as compared with the case where the closing member 80 is not used. In addition, it is possible to make the notification sound more audible while improving the waterproofness.

In addition, when a received voice signal is input, the sound control unit 50 and the speaker 60 corresponding to the sound generation unit correct the sound pressure of the sound of the predetermined frequency of the received voice signal so as to emphasize or suppress the correction. A later received voice signal is generated from a speaker.
In this configuration, when the notification sound is emitted, the sound near the resonance frequency included in the notification sound is emphasized by the resonator 70, so that the notification sound can be made easier to hear. However, when the resonator 70 is used, the unevenness of the waveform indicating the reception frequency characteristic is likely to increase due to the influence thereof, and the speech quality deteriorates due to the sound pressure at a specific frequency becoming too large or too small. However, in this configuration, when a received voice signal is input to the sound generation unit, it is possible to correct at least the sound pressure level at a predetermined frequency, so that deterioration in call quality can be suppressed. it can. In other words, when the received voice is emitted, it is not emitted with exactly the same characteristics as in the case of the notification sound, but the correction can be performed with the digital correction method prepared for the received voice, and the voice can be emitted after changing the characteristics. While using a common speaker, it is possible to produce sound suitable for each.

  The correction unit 55 is configured to perform a correction process when a received voice signal is input. However, when a notification sound signal is input, the correction process may or may not be performed. You may do it. If correction processing is not performed when a notification sound signal is input, correction independent of the notification sound signal can be performed, and correction suitable for the received voice signal can be performed.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  In the above-described embodiment, the portable reader 1 configured as an apparatus for reading an information code is illustrated. However, in addition to a function for reading an information code, or instead of a function for reading an information code, a non-wireless tag or the like is used. You may have the function to read a contact communication medium.

  In the embodiment described above, the resonator 70 is illustrated as an example of a resonator in which the frequency (specific frequency) of the sound included in the notification sound is the resonance frequency. However, any resonator that has the resonance frequency as the resonance frequency is known. Other configurations may be used.

  In the above-described embodiment, the configuration in which the path for discharging the sound emitted from the speaker 60 to the outside of the case is closed by the closing member 80, but the configuration without such a closing member may be used.

  In the above-described embodiment, an example of the digital correction process for the received voice signal is shown, but the correction method is not limited to this example. For example, when the notification sound signal is input to the sound control unit 50, the correction is not performed, and when the reception voice signal is input to the sound control unit 50, when the reception voice signal is converted, the vicinity of a specific frequency is used. It is also possible to use a correction method that selectively reduces only the level.

DESCRIPTION OF SYMBOLS 1 ... Portable reader 10 ... Case 35 ... Memory 40 ... Control circuit (reading part, notification sound signal generation part)
44. Communication unit (received voice signal generation unit)
50 ... Sound control part (sounding part)
60 ... Speaker (sound generator)
DESCRIPTION OF SYMBOLS 70 ... Resonator 71 ... 1st cylindrical part 71a ... One end part 71b ... Other end part 72 ... 2nd cylindrical part 80 ... Closure member

Claims (4)

A reading unit for reading a reading target;
A case in which the reading unit is assembled;
A received voice signal generating unit that is assembled to the case and receives a call signal coming from outside the case via electromagnetic waves and generates a received voice signal;
A notification sound signal generator for generating a notification sound signal;
A speaker that generates a sound, and the reception voice signal generated by the reception voice signal generation unit and the notification sound signal generated by the notification sound signal generation unit can be input, and the reception voice signal A sound generating unit that generates a sound obtained by converting the received sound signal from the speaker when the sound is input, and generates a notification sound obtained by converting the notification sound signal from the speaker when the notification sound signal is input;
A resonator that is disposed in a path that emits sound from the speaker to the outside of the case, and that causes the notification sound to resonate when the notification sound is generated by converting the notification sound signal from the speaker;
Have
The sound generation unit, when the notification sound signal is input, generates the notification sound including a sound having a resonance frequency in the resonator.   The resonator is configured such that one end portion is configured as an opening facing the speaker side and is connected to the first cylindrical portion configured in a cylindrical shape and the other end portion of the first cylindrical portion, and The portable reading device according to claim 1, further comprising a second cylindrical portion that communicates with the first cylindrical portion and has a smaller diameter than the first cylindrical portion.   The closing member which closes the 2nd cylindrical part is arranged at the end side opposite to the 1st cylindrical part in the 2nd cylindrical part according to claim 2 characterized by things. Portable reader.   When the received voice signal is input, the sound generation unit corrects a sound pressure of a sound having a predetermined frequency of the received voice signal, and generates the received voice signal after the correction from the speaker. The portable reader according to any one of claims 1 to 3.

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