WO2006121044A1

WO2006121044A1 - Wireless microphone device

Info

Publication number: WO2006121044A1
Application number: PCT/JP2006/309322
Authority: WO
Inventors: Mamiko Okimoto; Ryoji Abe
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-05-12
Filing date: 2006-05-09
Publication date: 2006-11-16
Also published as: JP2006319615A; JP4516888B2

Abstract

A wireless microphone device (1) is provided with an internal information display section (3) for displaying prescribed internal information; a sound signal detecting section (6); and a display switching section (8). When a sound signal inputted to the wireless microphone device (1) is detected by the sound signal detecting section (6), the internal information display section (3) is switched to be in a non-display status from a display status by the display switching section (8). Waste battery power consumption is suppressed, and power consumption is saved.

Description

Technical field

The present invention relates to a low-power consumption wireless microphone device.

Background art

[0002] Wireless microphones used for karaoke and the like have advantages such as convenience in carrying. In order to take advantage of these advantages, the power source of the wireless microphone is composed of a battery provided inside the main body. Because the amount of power stored in knotteries is limited, it is necessary to reduce power consumption in wireless microphones.

[0003] For example, a conventional wireless microphone disclosed in Japanese Patent Application Laid-Open No. 11-215063 (pages 3-4, FIG. 1) has two infrared communication units arranged above and below the main body. And The on / off force of these two infrared communication units is controlled according to the grip position of the user, thereby reducing the power consumption of the battery.

By the way, conventionally, a wireless microphone having an internal information display unit in a main body has been used. This internal information display unit displays various internal information of the wireless microphone. The internal information is, for example, frequency information or battery voltage information. Of the total power consumption of the wireless microphone, the percentage of power consumed by the internal information display is relatively large!

However, with the conventional wireless microphone, it is not possible to switch on / off the display of the internal information display unit. Therefore, while using the user power S wireless microphone, the user often looks at the display on the internal information display section, but the internal information display section displays the internal information. The As a result, conventional wireless microphones waste a lot of knotter power.

Disclosure of the invention

Problems to be solved by the invention

[0006] The present invention has been made under the above background. The object of the present invention is to provide battery power It is an object of the present invention to provide a low-power consumption wireless microphone mouthphone device that can reduce wasteful consumption and reduce power consumption.

Means for solving the problem

One aspect of the present invention is a wireless microphone device, which includes an internal information display unit that displays predetermined internal information, an audio signal detection unit that detects an input audio signal, A display switching unit that switches the internal information display unit to a display state force non-display state when an audio signal is detected by the audio signal detection unit.

[0008] Another aspect of the present invention is a wireless microphone display control method that is applied to a wireless microphone device including an internal information display unit that displays predetermined internal information and controls display of the internal information display unit. In this method, an audio signal input to the wireless microphone device is detected, and when the audio signal is detected, the internal information display unit is switched from the display state to the non-display state.

[0009] As described below, there are other aspects of the present invention. Accordingly, this disclosure is intended to provide some aspects of the invention and is not intended to limit the scope of the invention described and claimed herein.

Brief Description of Drawings

FIG. 1 is a block diagram of a wireless microphone device according to a first embodiment of the present invention.

FIG. 2 is a front view of the wireless microphone device according to the first embodiment of the present invention.

FIG. 3 is a front view of the wireless microphone device (in use) according to the first embodiment of the present invention.

[FIG. 4] FIG. 4 is a block diagram of a wireless microphone device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of an integration processing unit (digital filter) in the second embodiment of the present invention.

[Fig. 6] Fig. 6 is a diagram showing the remaining battery level and the integral output signal in the second embodiment of the present invention. Correspondence table of time constants for increasing and decreasing trends

FIG. 7 is an explanatory diagram of a display state / non-display state of the internal information display unit for the audio signal and the integrated output signal in the second embodiment of the present invention.

Explanation of symbols

[0011] 1 Wireless microphone device

3 Internal information display

6 Audio signal detector

8 Display switching part

9 Integration processing section

10 Detection discriminator

11 Battery level detector

12 Time constant switching part

τ (τ 1, τ 2) time constant

Ls threshold level

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] The following is a detailed description of the present invention. However, the following detailed description and the accompanying drawings do not limit the invention. Instead, the scope of the invention is defined by the appended claims.

[0013] In the wireless microphone device of the present invention, an internal information display unit that displays predetermined internal information, an audio signal detection unit that detects an input audio signal, and an audio signal detected by the audio signal detection unit A display switching unit for switching the internal information display unit from the display state to the non-display state.

[0014] With this configuration, while the user is using the wireless microphone device, the audio signal input to the wireless microphone device is detected by the audio signal detection unit. When the audio signal is detected, the internal information display unit is switched from the display state to the non-display state. Therefore, when the user hardly sees the internal information, the internal information display section is hidden. Although it is not so necessary, the time during which the internal information display unit is in the display state can be shortened, and the power consumption of the knotter can be reduced. [0015] The audio signal detection unit detects the audio signal by comparing the integration processing unit that integrates the audio signal with a predetermined time constant, and the integration output signal output from the integration processing unit with a predetermined threshold. You may provide the detection discrimination | determination part which discriminate | determines the produced force dysfunction.

[0016] With this configuration, the wireless microphone device can integrate the input audio signal with a predetermined time constant, and detect the audio signal by comparing the integrated output signal with a predetermined threshold value. The waveform of this integrated output signal is a smooth waveform with little increase / decrease change compared to the waveform of the audio signal. That is, even when the input of the audio signal fluctuates violently in a short time, the fluctuation of the integrated output signal becomes relatively gradual. Therefore, by comparing the integrated output signal with the threshold and detecting the audio signal, it is possible to suppress frequent switching of the display state and non-display state of the internal information display unit in a short time. As a result, it is possible to suppress the occurrence of flickering caused by frequent switching of the display 'non-display state of the internal information display unit.

[0017] Further, the audio signal detection unit includes a time constant switching unit that switches a time constant according to an increasing / decreasing tendency of the integrated output signal.

[0018] With this configuration, the display / non-display state of the internal information display unit can be switched according to the increasing / decreasing tendency of the integrated output signal. For example, when the integrated output signal is increasing, the time constant is set larger than when the integrated output signal is decreasing. As a result, when the user starts speaking and the voice input is performed continuously and stably, the integrated output signal exceeds the threshold after a little time has elapsed since the user started speaking. Therefore, when the user starts talking, the internal information display unit is switched to the display state power non-display state after a moderate time has elapsed. On the other hand, when the integrated output signal is decreasing, the time constant is set smaller than when the integrated output signal is increasing. As a result, when the user interrupts the speech and the voice input is interrupted, the integrated output signal becomes smaller than the threshold immediately after the user interrupts the speech. Therefore, when the user interrupts the talk and tries to view the internal information display, the internal information display unit is immediately switched from the non-display state to the display state.

[0019] Further, the wireless microphone device includes a battery remaining amount detection unit for detecting the remaining battery level, and the time constant switching unit is further detected by the battery remaining amount detection unit. The time constant may be switched according to the remaining battery level.

[0020] With this configuration, it is possible to reduce power consumption in consideration of the remaining amount of knottery. For example, when the remaining battery level is low, the time constant is set faster than when the remaining battery level is high. As a result, power consumption can be reduced more effectively when there is little remaining knottery.

[0021] As described above, the present invention generally includes an audio signal detection unit that detects an audio signal input to a wireless microphone device, and an internal signal when an audio signal is detected by the audio signal detection unit. By providing a display switching unit that switches the information display unit from the display state to the non-display state, the chance of wasting battery power is reduced, and power consumption can be reduced.

Hereinafter, a wireless microphone device according to an embodiment of the present invention will be described with reference to the drawings. This embodiment exemplifies the case of a hand-held wireless microphone device used in karaoke or a lecture hall.

[0023] (First embodiment)

1 and 2 show a wireless microphone device 1 according to a first embodiment of the present invention. First, FIG. 2 shows the appearance of the wireless microphone device 1. The wireless microphone device 1 has a cylindrical casing. Although not particularly illustrated, the wireless microphone device 1 includes a microphone that receives sound, an AD converter that converts the sound input to the microphone into an analog signal, and a digital signal that is converted by the AD converter. A transmission device is provided that transmits the converted audio signal to the wireless microphone reception device. The wireless microphone device 1 also has a rotary switch for changing the transmission frequency to the wireless microphone receiver, a storage unit for storing the changed transmission frequency information, and turning on / off the power manually. It is equipped with a power switch and so on to switch between. As shown in FIG. 2, a liquid crystal display screen 4 of the internal information display unit 3 is provided at the center of the main body 2 of the wireless microphone device 1. A microphone head 5 having a microphone inside is provided at the top of the main body 2.

Next, a configuration related to the internal information display function in the wireless microphone device 1 which is a main part of the present invention will be described with reference to FIG. Wireless microphone device 1 The internal information display unit 3 that displays various internal information of the wireless microphone device 1, the audio signal detection unit 6 that detects the audio signal input to the wireless microphone device 1, and the detection result of the audio signal detection unit 6 Accordingly, it has a display switching unit 8 for switching on / off the power supply from the battery 7 to the internal information display unit 3. Here, the various internal information of the wireless microphone mouthphone device 1 is, for example, transmission frequency information to the wireless microphone receiver, voltage information of the battery 7, and the like. In the present embodiment, the audio signal detection unit 6 compares the audio signal input to the wireless microphone device 1 with the predetermined threshold level Ls, and the audio signal level exceeds the threshold level Ls. Is configured to determine that a voice signal has been detected.

[0025] The operation of the wireless microphone device 1 configured as described above will be described with reference to FIG. When the user talks using the wireless microphone device 1, the user grasps the main body 2 of the wireless microphone device 1 and speaks toward the microphone head 5. At this time, the liquid crystal display screen 4 of the internal information display unit 3 provided at the center of the main body 2 is covered with the hand H of the user. However, the user speaks with the microphone head 5 close to his / her mouth. Therefore, while the user is using the wireless microphone device 1, the user hardly sees the liquid crystal display screen 4 positioned below the microphone head 5 by himself / herself. Therefore, in such a case, the internal information display unit 3 is switched to the non-display state as follows.

[0026] When the user speaks using the wireless microphone device 1, the voice input by the microphone is converted into a voice signal by AD conversion. When the level of the audio signal exceeds the threshold level Ls, the audio signal is detected by the audio signal detector 6. When an audio signal is detected by the audio signal detection unit 6, an off signal is sent from the audio signal detection unit 6 to the display switching unit 8. The display switching unit 8 that has received the OFF signal turns off the power supply from the knotter 7 to the liquid crystal display screen 4 of the internal information display unit 3. Then, the liquid crystal display screen 4 from which the power supply from the battery 7 is cut off is turned off. In this way, the internal information display unit 3 is not displayed.

[0027] On the other hand, when the wireless microphone device 1 is not used, for example, when the user interrupts the conversation and checks the internal information, the user interrupts the utterance toward the microphone head 5, Move the microphone head 5 away from your location. If the liquid crystal display screen 4 of the internal information display section 3 is covered by the user's hand H, the user removes the covered hand H to expose the liquid crystal display section, and the liquid crystal display screen Try to see 4. In such a case, the internal information display unit 3 is switched to the display state as follows.

In this case, no sound is input to the microphone of the wireless microphone device 1. Therefore, the level of the audio signal is smaller than the threshold level Ls, and the audio signal is not detected by the audio signal detection unit 6. When the audio signal is not detected by the audio signal detection unit 6, an ON signal is sent from the audio signal detection unit 6 to the display switching unit 8. The display switching unit 8 that has received the ON signal turns on the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3. Liquid crystal display screen 4 with power supplied from battery 7 lights up. In this way, the internal information display unit 3 enters the display state. Then, the user can check the internal information of the wireless microphone device 1 by looking at the liquid crystal display screen 4.

[0029] According to the wireless microphone device 1 of the first embodiment as described above, the user-powered wireless microphone device 1 is used by providing the audio signal detection unit 6 and the display switching unit 8. In the meantime, the audio signal input to the wireless microphone device is detected by the audio signal detector 6. When an audio signal is detected, the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3 is switched on and off, and the liquid crystal display screen 4 of the internal information display unit 3 is turned off.

[0030] As described above, while using the user-powered wireless microphone device 1, the user hardly sees the liquid crystal display screen 4. For this reason, there is almost no need to turn on the liquid crystal display screen 4 of the internal information display section 3 to display it. In such a case, the wireless microphone device 1 according to the present embodiment can reduce the time during which the internal information display unit 3 is in the display state even though it is not necessary much. Wasteful power consumption can be reduced. As a result, the power consumption of the wireless microphone device 1 can be saved, and the lifetime of the knotter 7 can be suppressed from being shortened.

[0031] (Second Embodiment)

Next, FIG. 4 shows a block diagram of the wireless microphone device 1 of the second embodiment. . In the wireless microphone device 1 of the present embodiment, an integration processing function and a time constant switching function are further added to the audio signal detection unit 6 of the wireless microphone mouthphone device 1 of the previous embodiment. Here, the integration processing function and the time constant switching function added in the present embodiment will be mainly described, and the description of the same configuration as the previous embodiment will be omitted.

[0032] The audio signal detection unit 6 of the wireless microphone device 1 of the present embodiment includes an integration processing unit 9 that integrates the audio signal input to the wireless microphone device 1 with a predetermined time constant, and integration. A detection discriminating unit 10 for comparing the output level of the integrated output signal output from the processing unit 9 with a predetermined threshold level Ls to discriminate whether or not the voice signal has been detected, A battery remaining amount detecting unit 11 for detecting the remaining amount and a time constant switching unit 12 for switching the time constant τ according to the increasing tendency or decreasing tendency of the output level of the integrated output signal are provided. In this case, the time constant switching unit 12 is configured to perform the switching of the time constant τ even in accordance with the remaining battery level detected by the remaining battery level detection unit 11.

FIG. 5 is an explanatory diagram of the integration processing unit 9. In the present embodiment, a digital filter is used as the integration processing unit 9, and for example, a first-order IIR filter as shown in FIG. 5 is used. Here, the coefficients a and b are set so as to satisfy a + b = l, and the integration processing unit 9 is configured to converge with a predetermined time constant τ. As described above, the integration processing unit 9 integrates the audio signal input to the integration processing unit 9 with the amplification factor l (= a + b), and converts the integration output signal into the detection determination unit 10 and the time constant. It is configured to output to the switching unit 12 (see Fig. 4).

[0034] When the output level of the integrated output signal is equal to or higher than the predetermined threshold level Ls, the detection determination unit 10 determines that an audio signal has been detected, and the output level of the integrated output signal is equal to the predetermined threshold level Ls. If it is smaller, it is determined that the voice signal has not been detected (see FIG. 7).

The time constant switching unit 12 receives the integration output signal from the integration processing unit 9 (see FIG. 4).

The time constant switching unit 12 sets the time constant τ longer when the output level of the integrated output signal tends to increase, while the time constant changes as the time constant when the output level of the integrated output signal tends to decrease. Is configured to be set short. More specifically, the time constant switching unit 12 Determines that the output level of the integrated output signal tends to increase when the integrated output signal is increasing (when the slope of the integrated output signal is positive). The time constant switching unit 12 determines that the output level of the integrated output signal is decreasing when the integrated output signal is decreasing (when the slope of the integrated output signal is negative) (see FIG. 7). .

[0036] When the remaining battery level detected by the remaining battery level detection unit 11 is greater than a predetermined value, the time constant switching unit 12 sets a longer time constant while detecting the remaining battery level. When the remaining battery level detected by the unit 11 is below a predetermined value, the time constant τ is set short. Note that, for example, a not-shown battery voltage is input to the notch remaining amount detection unit 11, and the remaining battery amount is detected based on the voltage value.

For example, in the present embodiment, as shown in FIG. 6, the time constant τ 1 when the remaining battery level is high is set to 1000 ms when the output level of the integrated output signal tends to increase. When the output level of the integrated output signal tends to decrease, it is set to 50 ms. Also, the time constant τ 2 when the remaining amount of knotley is low is set to 100 ms when the output level of the integrated output signal tends to increase, and when the output level of the integrated output signal tends to decrease Set to 50 ms.

The operation of the wireless microphone device 1 configured as described above will be described with reference to FIG. Here, the operation of the integration processing function and the time constant switching function added in the present embodiment will be mainly described, and the description of the same operation as that of the previous embodiment will be omitted.

First, the operation of the wireless microphone device 1 of the present embodiment when the remaining battery level is large will be described. When a user speaks using the wireless microphone device 1, the voice signal power as shown in the first graph in FIG. 7 is input to the voice signal detection unit 6 of the wireless microphone device 1. In the present embodiment, the audio signal is first input to the integration processing unit 9 of the audio signal detection unit 6.

Next, the audio signal input to the integration processing unit 9 is integrated with an amplification factor of 1 (= a + b), and is output to the detection determination unit 10 and the time constant switching unit 12 as an integration output signal. Is done. In this case, the remaining battery level detected by the notch level detection unit 11 exceeds the predetermined value. Therefore, the time constant switching unit 12 sets the time constant τ to the time constant τ 1 having a long integration time. When the output level of the integrated output signal tends to increase, the time constant switching unit 12 sets the time constant τ 1 to 1000 ms. On the other hand, when the output level of the integrated output signal tends to decrease, the time constant τ 1 is set to 50 ms by the time constant switching unit 12. Therefore, as shown in the second graph in Fig. 7, the waveform of the integrated output signal has a gentle slope when the integrated output signal is increasing, and the integrated output signal is decreasing. There is a steep waveform. At this time, the waveform of the integrated output signal is smoother than the waveform of the audio signal.

The integrated output signal that has been integrated in this way is input to the detection discriminating unit 10. The detection discriminating unit 10 compares the output level of the integrated output signal with a predetermined threshold level Ls. When the output level of the integrated output signal is equal to or higher than the predetermined threshold level Ls, the detection determination unit 10 determines that an audio signal has been detected.

[0042] When the detection determination unit 10 determines that an audio signal has been detected, an off signal is sent from the detection determination unit 10 to the display switching unit 8. The display switching unit 8 that has received the OFF signal turns off the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3. Then, the liquid crystal display screen 4 from which the power supply from the battery 7 is cut off is turned off. In this way, the internal information display section 3 is in a non-display state (see the third graph in FIG. 7).

) o

[0043] At this time, if the output level of the integrated output signal tends to increase, the integration time of the time constant τ 1 is set as long as 1000 ms. In that case, the output level of the integrated output signal gradually increases, and after a short time has passed since the user started speaking, the output level of the integrated output signal exceeds the threshold level Ls (see Fig. 7). That is, when the audio signal level exceeds the threshold level Ls, the output level of the integrated output signal exceeds the threshold level Ls with a slight delay. Therefore, when the user starts talking, the internal information display unit 3 is not displayed after a while.

On the other hand, when the output level of the integrated output signal is smaller than the predetermined threshold level Ls, the detection discriminating unit 10 discriminates that it has not detected the audio signal. If the detection discriminating unit 10 determines that the voice signal has not been detected, the user interrupts the conversation and When confirming the information, an ON signal is sent from the detection determination unit 10 to the display switching unit 8. Upon receiving the ON signal, the display switching unit 8 turns on the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3. The liquid crystal display screen 4 that has been supplied with power from the battery 7 is lit. In this way, the internal information display unit 3 is in a display state (see the third graph in FIG. 7). Then, the user can check the internal information of the wireless microphone / phone apparatus 1 by looking at the liquid crystal display screen 4.

At this time, if the output level of the integrated output signal tends to decrease, the integration time of the time constant τ 1 is set to be as short as 50 ms. In that case, the output level of the integrated output signal decreases rapidly, and as soon as the user stops speaking, the output level of the integrated output signal becomes lower than the threshold level Ls (see Fig. 7). That is, the output level of the integrated output signal becomes lower than the threshold level Ls almost simultaneously with the audio signal level becoming lower than the threshold level Ls. Therefore, when the user stops talking, the internal information display unit 3 is immediately displayed.

Next, the operation of the wireless microphone device 1 of the present embodiment when the remaining battery level is low will be described. In this case, since the remaining battery level detected by the notch remaining level detection unit 11 is smaller than a predetermined value, the time constant switching unit 12 switches the time constant τ to the time constant τ 2 having a short integration time. When the output level of the integrated output signal tends to increase, the time constant τ 2 is set to 100 ms by the time constant switching unit 12. On the other hand, when the output level of the integrated output signal tends to decrease, the time constant τ 2 is set to 50 ms by the time constant switching unit 12. Therefore, as shown in the fourth graph in FIG. 7, the waveform of the integrated output signal has a steep slope not only when the output level of the integrated output signal is decreasing but also when it is increasing. It becomes a waveform.

Then, in the same manner as described above, when the detection determination unit 10 determines that an audio signal has been detected, an off signal is sent from the detection determination unit 10 to the display switching unit 8. The display switching unit 8 that has received the off signal turns off the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3. Then, the liquid crystal display screen 4 from which the power supply from the battery 7 is cut off is turned off, and the internal information display section 3 is not displayed (see the fifth graph in FIG. 7).

[0048] At this time, even if the output level of the integrated output signal tends to increase, the remaining battery level is high. The integration time of the time constant τ 2 is set as short as 100 ms. As a result, the output level of the integrated output signal increases rapidly, and as soon as the user starts speaking, the output level of the integrated output signal exceeds the threshold level Ls (see Figure 7). In other words, almost simultaneously with the audio signal level exceeding the threshold level Ls, the output level of the integrated output signal exceeds the threshold level Ls. Therefore, even when the user starts talking, the internal information display unit 3 is immediately hidden.

On the other hand, when it is determined by the detection determination unit 10 that the audio signal has not been detected, for example, when the user interrupts the conversation and confirms the internal information, the detection is performed in the same manner as in the above case. An ON signal is sent from the determination unit 10 to the display switching unit 8. Upon receiving the ON signal, the display switching unit 8 turns on the power supply from the battery 7 to the liquid crystal display screen 4 of the internal information display unit 3. The liquid crystal display screen 4 to which power is supplied from the battery 7 is lit, and the internal information display unit 3 is in a display state (see the fifth graph in FIG. 7). Then, the user can check the internal information of the wireless microphone device 1 by looking at the liquid crystal display screen 4.

[0050] At this time, if the output level of the integrated output signal tends to decrease, the integration time of 2 as a time constant is set to be as short as 50 ms, as in the above case. Therefore, the output level of the integrated output signal decreases rapidly, and as soon as the user stops speaking, the output level of the integrated output signal becomes lower than the threshold level Ls (see Fig. 7). That is, the output level of the integrated output signal becomes lower than the threshold level Ls almost simultaneously with the audio signal level becoming lower than the threshold level Ls. Therefore, when the user stops speaking, the internal information display unit 3 is immediately displayed.

[0051] According to the wireless microphone device 1 of the second embodiment as described above, the integration in which the audio signal input to the wireless microphone device 1 is integrated into the audio signal detection unit 6 with a predetermined time constant τ. A processing unit 9 and a detection discriminating unit 10 for discriminating whether or not a voice signal has been detected by comparing the integrated output signal output from the integration processing unit 9 with a predetermined threshold value are provided. As a result, the audio signal input to the wireless microphone device 1 is integrated with a predetermined time constant τ (τ1, τ2), and the integrated output signal is compared with a predetermined threshold level Ls to detect the audio signal. It can be performed. [0052] The waveform of this integrated output signal is a smooth waveform with little increase / decrease change compared to the waveform of the audio signal! That is, even when the input of the audio signal fluctuates violently in a short time, the fluctuation of the output level of the integrated output signal becomes relatively moderate. Therefore, by comparing the output level of the integral output signal with the threshold level Ls and detecting the audio signal, switching between the display state and non-display state of the internal information display unit 3 is suppressed frequently in a short time. can do. As a result, it is possible to suppress the occurrence of flickering caused by frequent switching of the display / non-display state of the internal information display unit 3.

[0053] In addition, in the wireless microphone device 1 of the second embodiment, an integral output is provided by providing a time constant switching unit that switches the time constant _τ according to the increasing / decreasing tendency of the output level of the integrated output signal. The display / non-display state of the liquid crystal display screen 4 of the internal information display unit 3 can be switched according to the increasing and decreasing tendency of the signal output level.

[0054] When the output level of the integrated output signal tends to increase, the time constant is set larger than when the output level tends to decrease. As a result, when the user starts speaking and the voice input is performed continuously and stably, the output level of the integrated output signal exceeds the threshold level Ls after a little time has elapsed since the user started speaking. . Therefore, when the user starts talking, the internal information display section naturally switches from the display state to the non-display state after a moderate amount of time has elapsed.

[0055] On the other hand, when the output level of the integrated output signal tends to decrease, the time constant is set smaller than when the output level tends to increase. As a result, when the user interrupts the speech and the voice input is interrupted, the output level of the integrated output signal becomes smaller than the threshold level Ls immediately after the user interrupts the speech. Therefore, when the user interrupts the conversation and tries to view the internal information display, the internal information display section immediately switches from the non-display state to the display state, and the user immediately sees the internal information display. Can do.

Furthermore, in the wireless microphone device 1 according to the second embodiment of the present invention, the remaining amount of the battery 7 is reduced by switching between the time constants τ 1 and τ 2 according to the detected remaining battery amount. Power consumption can be reduced in consideration. When the battery level is high, the audio signal is integrated using the time constant τ 1 with a long integration time. When the battery level is low, the audio signal is set with a time constant 2 that is a short integration time. Is integrated. . As a result, when the battery level is low, even when the user starts speaking, the internal information display unit 3 can be immediately hidden to reduce power consumption more effectively. . Therefore, the battery 7 of the wireless microphone device 1 can be made long lasting.

[0057] The power of the embodiments of the present invention described above by way of example. The scope of the present invention is not limited to these, but can be changed and modified according to the purpose within the scope of the claims. Is possible.

[0058] For example, in the above description, the time constant is switched in two steps according to the remaining power knottery, the time constant τ 1 having a long integration time and the time constant τ 2 having a short integration time. In another example, the time constant may be switched between a plurality of stages of three or more according to the remaining battery level, and the present invention can be implemented. In that case, it is possible to reduce the power consumption more closely corresponding to the remaining amount of knottery.

[0059] In the example described above, the integration processing unit is configured by a digital filter (IIR filter). However, the present invention can be implemented by using other analog integrators (for example, a CR integration circuit).

In the example described above, the display state “non-display state” of the internal information display unit is realized by turning on / off the liquid crystal display screen. In another example, the non-display state of the internal information display unit can be realized by slightly lighting the liquid crystal display screen (lighting with low brightness).

[0061] The power of explaining the preferred embodiment of the present invention considered at the present time. It will be understood that various modifications can be made to the present embodiment, and the true spirit and scope of the present invention are understood. It is intended that the appended claims include all such variations that fall within the scope.

Industrial applicability

[0062] As described above, the wireless microphone device according to the present invention has the effect of reducing the chance of wasting battery power and reducing power consumption, and has a low power consumption wireless microphone. It is useful as a device.

Claims

The scope of the claims

[1] an internal information display unit for displaying predetermined internal information;

An audio signal detector for detecting the input audio signal;

A display switching unit that switches the internal information display unit from a display state to a non-display state when the audio signal is detected by the audio signal detection unit;

A wireless microphone device characterized by comprising:

[2] The audio signal detector

An integration processing unit that integrates the audio signal with a predetermined time constant;

A detection discriminating unit for discriminating whether or not a voice signal is detected by comparing the integral output signal output to the integral processing unit and a predetermined threshold;

The wireless microphone device according to claim 1, further comprising:

[3] The audio signal detector

3. The wireless microphone device according to claim 2, further comprising a time constant switching unit that switches the time constant according to an increasing / decreasing tendency of the integrated output signal.

[4] A battery level detector that detects the battery level

4. The wireless microphone device according to claim 3, wherein the time constant switching unit further switches the time constant according to the remaining battery level detected by the remaining battery level detection unit.

[5] A wireless microphone display control method that is applied to a wireless microphone device including an internal information display unit that displays predetermined internal information, and that controls display of the internal information display unit,

Detecting an audio signal input to the wireless microphone device;

A wireless microphone display control method, wherein the internal information display unit is switched from a display state to a non-display state when the audio signal is detected.