JP6223776B2 - Wireless microphone system - Google Patents

Description

  The present invention relates to a wireless microphone system and a microphone including a detection device that detects angle information such as a gyroscope sensor.

  Wireless microphone systems are used in broadcasting stations, schools, station premises, theaters, and the like. The wireless microphone is used as a loudspeaker, and the user allows the listener to hear his / her voice through the wireless microphone.

  A wireless microphone has directivity and proximity effect characteristics in a microphone head portion that collects sound. Therefore, the obtained frequency characteristics differ depending on the angle and distance between the microphone and the sound source. That is, as shown in FIG. 4, the sensitivity tends to decrease as the angle between the microphone and the sound source increases, and as shown in FIG. 5, the sensitivity is emphasized in the low frequency region as the sound source approaches the microphone. There is a tendency. Therefore, if the user wants to obtain desired characteristics, the user needs to be aware of these characteristics and input a voice.

JP 2001-91267 A

  However, the distance, angle, etc. between the user's mouth and the microphone may not always be constant. For example, the user may unintentionally tilt the microphone and the distance between the microphone and the mouth gradually increases. In such a case, not only the performance of the microphone cannot be fully utilized, but the quality of the sound is not constant, and it becomes difficult for the listener to hear.

  At present, the above cases can be dealt with by correcting the sound with a sound adjusting device (mixer) or the like, but this has been a burden on the operator of the mixer.

  The present invention has been made to solve the above-described problems, and can perform voice correction processing corresponding to directivity characteristics and proximity effect characteristics, improve voice performance, and realize wireless that can be heard more easily. It is to provide a microphone system and a microphone.

A wireless microphone system of the present invention is a wireless microphone system that transmits and receives audio input to a microphone by radio waves, and has the following configuration.
(1) An angle detector that detects angle information of the microphone.
(2) An audio processing unit that performs an audio signal correction process on the audio based on a detection result by the angle detection unit.
(3) A volume detection unit that detects the volume of the audio signal.
(4) A parameter storage unit in which the degree of correction associated with the detection result of the volume detection unit and the angle detection unit detected in advance is stored.
(5) The voice processing unit performs correction processing of the voice signal based on detection results by the volume detection unit and the angle detection unit, and corresponds to the detection results of the volume detection unit and the angle detection unit. The audio signal is corrected based on the degree of correction.

  ADVANTAGE OF THE INVENTION According to this invention, the audio | voice correction process corresponding to a directivity characteristic and a proximity effect characteristic is possible, audio | voice performance improves, and the wireless microphone system and microphone which can implement | achieve a more easily audible voice can be obtained.

1 is a diagram illustrating an overall configuration of a wireless microphone system according to a first embodiment. (A) is a figure which shows the state before a microphone inclines, (b) is a figure which shows the state in which the microphone inclined. It is a flowchart which shows operation | movement of the wireless microphone system which concerns on 1st Embodiment. It is a figure which shows an example of the difference (directivity characteristic) of the frequency characteristic by the angle between a microphone and a sound source. It is a figure which shows an example of the difference (proximity effect characteristic) of the frequency characteristic by the distance of a microphone and a sound source.

  Hereinafter, a wireless microphone system according to an embodiment of the present invention will be described with reference to the drawings.

[1. First Embodiment]
[1-1. Constitution]
FIG. 1 is a diagram illustrating an overall configuration of a wireless microphone system according to the present embodiment. This wireless microphone system is used, for example, in broadcasting stations, schools, station premises, theaters, etc., detects the volume input to the microphone, the attitude of the microphone, and changes in attitude, and based on these detection results, This is to change and correct voice parameters such as sound quality. Such a wireless microphone system includes a wireless microphone 10 that transmits radio waves according to voice input, and a receiving device 20 that receives the radio waves.

(Wireless microphone 10)
The wireless microphone 10 includes a conversion unit 11, a sound volume detection unit 12, and an angle detection unit 13. The conversion unit 11, the sound volume detection unit 12, and the angle detection unit 13 are built in the wireless microphone 10.

  The conversion unit 11 receives a sound wave emitted from a sound source and input to the wireless microphone 10 and converts the sound wave into an audio signal that is an electric signal corresponding to the strength and frequency of the sound wave. As shown in FIG. 1, the conversion unit 11 is connected to the sound volume detection unit 12 and a sound processing unit 23 of the receiving device 20 described later, and the converted sound signal is sent to the sound volume detection unit 12 and the sound processing unit 23. Output.

  The volume detection unit 12 detects the volume based on the voltage of the input audio signal. The sound volume detection unit 12 outputs the detected sound volume as a detection result to the comparison determination unit 21 of the reception device 20. Note that the sound volume is continuously detected at predetermined time intervals. This time interval can be changed as appropriate. In the present embodiment, the sound volume detection unit 12 detects the sound volume with the voltage of the input audio signal, and thus does not detect the change of the frequency component.

  The angle detection unit 13 includes an angle information detection device such as a gyroscope sensor, for example, and detects the angle of the wireless microphone 10 in use and its change. The angle information can include at least one of the angle of the wireless microphone 10 in use, the change thereof, and the angular velocity. In the present embodiment, the angle detection unit 13 is an angle indicating how much the wireless microphone 10 is currently used with respect to the reference angle, and when the user moves the wireless microphone 10, An angle change indicating how much the angle is changed from the use angle and how much the angle is changed, and an angular velocity indicating how much the angle change is detected are detected.

  Here, the angle of the wireless microphone 10 refers to the central axis set on the wireless microphone 10 and one point on the central axis (for example, the center of gravity of the wireless microphone 10 or the center of the microphone head portion of the wireless microphone 10). This is the angle between the line segment connecting the sound source and the sound source. The reference angle refers to, for example, an angle when a sound source is on the central axis of the wireless microphone 10, that is, a case where the angle of the wireless microphone 10 is 0 degrees, as illustrated in FIG. The posture of the wireless microphone 10 in such a state is referred to as a reference posture. FIG. 2B shows a state where the wireless microphone 10 is tilted from the reference angle.

  Similar to the sound volume detection unit 12, the angle detection unit 13 continuously detects angles, angle changes, and angular velocities at predetermined time intervals, and outputs the detection results to the comparison determination unit 21 of the receiving device 20. This time interval can be changed as appropriate.

(Receiver 20)
The receiving device 20 includes a comparison / determination unit 21, a parameter storage unit 22 connected to the comparison / determination unit 21, and an audio processing unit 23 connected to the output side of the comparison / determination unit 21. The comparison / determination unit 21 includes a volume comparison / determination unit 21a and an angle comparison / determination unit 21b. The comparison determination unit 21 compares the detection result received from the wireless microphone 10 with various threshold values acquired from the parameter storage unit 22, and corrects the audio signal. Whether or not is necessary is determined. The determination result is output to the sound processing unit 23 as a sound correction processing signal indicating the change degree of the sound parameter.

  The volume comparison determination unit 21a includes a storage unit (not shown), and sequentially stores the detection results received from the volume detection unit 12 in the storage unit. The volume comparison / determination unit 21a calculates the difference between the received volume and the volume received immediately before and stored in the storage unit, and the magnitude of the volume change and a preset threshold for the volume change. Compare Further, the volume comparison determination unit 21a determines the direction of volume change based on the calculated volume change amount. The direction of volume change includes a direction in which the volume increases and a direction in which the volume decreases.

  For example, when the sound volume emitted from the sound source is constant, when the wireless microphone 10 moves from a reference posture as shown in FIG. 2A to a tilted posture as shown in FIG. Since the distance between the sound source 10 and the sound source is increased, the sound volume gradually decreases accordingly. The sound volume comparison / determination unit 21a detects the change in the sound volume, determines that the wireless microphone 10 is moving in the direction in which the sound volume decreases, and moves in the direction in which the sound volume increases in the reverse relationship. judge.

  The angle comparison determination unit 21b compares the angle change amount detected by the angle detection unit 13 with a preset threshold value of the angle change amount. When the angle change amount exceeds the threshold value, it is determined that there is a possibility that the audio signal needs to be corrected. When the angle change amount does not exceed the threshold value, it is determined that there is no necessity.

  The angle comparison determination unit 21b determines the direction of the change from the angle change detected by the angle detection unit 13. As the direction of angle change, a direction changing from a reference posture as shown in FIG. 2A to a tilted posture as shown in FIG. 2B, that is, a direction away from the reference posture, and the opposite reference. There is a direction to approach the posture.

  Based on the angular velocity detected by the angle detection unit 13, the angle comparison determination unit 21b determines whether or not the change in the attitude of the wireless microphone 10 is intentional by the user. That is, the angle comparison determination unit 21b compares the angular velocity detected by the angle detection unit 13 with a preset angular velocity threshold. When the detected angular velocity is larger than the threshold, it is determined that the user of the wireless microphone 10 has intentionally changed the posture, and when the angular velocity is smaller than the threshold, the user of the wireless microphone 10 is not intentionally wireless. It is determined that the posture of the microphone 10 has changed, and it is determined that there is a possibility that a sound signal correction process may be required.

  The comparison determination unit 21 determines whether or not the change direction of the sound volume matches the change direction of the angle based on the information obtained by the sound volume comparison determination unit 21a and the angle comparison determination unit 21b. If the sound volume and the direction of angle change match, it is determined that there is a possibility that the audio signal needs to be corrected, and if it does not match, it is determined that there is no need.

  The direction in which the volume changes and the direction in which the angle changes coincide with each other when the volume decreases and the posture tilts and the microphone moves away from the sound source. Say. The change direction of the sound volume does not match the change direction of the angle means that the sound volume is reduced and the posture is correct, and that the sound volume is increased and the posture is inclined.

  As described above, the comparison / determination unit 21 uses the volume change amount, the angle change amount, the angular velocity, and the coincidence between the volume and the change direction of the angle as materials for determining the necessity of the audio signal correction process, When it is determined that there is a need for correction processing, it is determined that sound signal correction processing is necessary. If there is no need for correction processing in any of the determination materials, it is determined that correction processing is unnecessary.

  The parameter storage unit 22 stores a volume change amount, an angle change amount, and an angular velocity threshold value in advance. The comparison determination unit 21 acquires various threshold values to be compared with the detection result from the parameter storage unit 22. A plurality of these threshold values may be stored in the parameter storage unit 22 in accordance with the movement of the user's wireless microphone 10. Thereby, it is possible to determine whether or not an accurate correction process is necessary according to the movement pattern of the user.

  Further, the parameter storage unit 22 stores in advance the degree of change of the sound parameters (volume, frequency characteristics, etc.) by associating the detection results of the sound volume detection unit 12 and the angle detection unit 13 with the sound correction processing. . That is, since the wireless microphone 10 has a unique directivity characteristic and proximity effect characteristic, the degree of change of the audio parameter corresponding to the change in volume and angle is determined in advance at the time of design. For example, a change degree table in which the vertical axis represents the volume change amount and the horizontal axis represents the angle change amount is created and stored in advance. The degree of correction can be set as appropriate. In addition, since the directivity characteristics and the proximity effect characteristics are different for each wireless microphone 10, it is possible to appropriately set the plurality of wireless microphones 10.

  As described above, the volume change amount, the angle change amount, the angular velocity, and the change degree of the voice parameter are stored in association with each other. For this reason, when the comparison determination unit 21 determines that the sound signal correction process is necessary, it is possible to determine the change degree of the sound parameter according to the detection result. The comparison / determination unit 21 acquires information on the degree of change of the audio parameter according to the detection result from the parameter storage unit 22, and outputs an audio correction processing signal including this information to the audio processing unit 23. The sound correction processing signal is a control signal of the sound processing unit 23.

  The audio processing unit 23 includes a volume changing unit 23a and a sound quality changing unit 23b. Based on the audio correction processing signal from the comparison determination unit 21, the audio processing unit 23 sets audio parameters in real time for the audio signal received from the wireless microphone 10. Perform the change process. The audio processing unit 23 can be configured by, for example, an analog audio processing circuit using an amplifier or the like, or a digital processor.

  That is, the volume changing unit 23 a changes the volume of the input audio signal based on the audio correction processing signal from the comparison determining unit 21. The sound quality changing unit 23b is an equalizer, and changes the sound quality (frequency characteristics) with respect to the input sound signal based on the sound correction processing signal from the comparison determination unit 21. The audio processing unit 23 outputs an audio signal whose volume and quality are changed to the outside of the wireless microphone system.

[1-2. Operation]
As an example of the situation where audio correction processing is performed in this wireless microphone system, assume a situation where the distance between the microphone and the user's mouth gradually increases in situations where the microphone user does not intend. ing. The situation changes from the attitude of FIG. 2A to the attitude of FIG. In such a situation, the speed of the change in the posture of the microphone is slow. On the other hand, when the microphone is intentionally separated from the mouth, which is the sound source, the posture change speed becomes faster.

  Hereinafter, the operation of the wireless microphone system of the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the operation of the wireless microphone system. Note that the order of operations in the flowchart of FIG. 3 is an example, and the present invention is not necessarily limited to this order.

  As shown in FIG. 3, first, when the wireless microphone 10 is activated (step S01), the volume input to the wireless microphone 10 by the volume detection unit 12 and the angle detection unit 13, and the angle and angle change of the wireless microphone 10, The angular velocity is detected (step S02). These detection results are output to the comparison determination unit 21 (step S03). Thereafter, the detection and the output of the detection result are performed until the wireless microphone 10 is stopped.

  Here, the comparison determination unit 21 determines whether or not the sound signal correction processing is necessary. That is, first, the comparison / determination unit 21 acquires a threshold value necessary for comparison in the angle comparison / determination unit 21b and the volume comparison / determination unit 21a from the parameter storage unit 22 (step S04).

  Next, the angle comparison / determination unit 21b compares the angle change amount with a threshold value of the angle change amount, and determines whether or not the angle change amount exceeds the threshold value (step S05). When the angle change amount exceeds the threshold value (Yes in step S05), the angle comparison determination unit 21b compares the angular velocity with the threshold value of the angular velocity, and determines whether the angular velocity is within the threshold value (step S06). When the angular velocity is within the threshold (Yes in Step S06), the comparison / determination unit 21 determines whether or not the change direction of the volume matches the change direction of the angle (Step S07).

  When the change directions match (Yes in step S07), the difference between the volume input from the volume detection unit 12 and the volume input immediately before stored in the storage unit is calculated to obtain the volume change amount (step) S08). The volume comparison determination unit 21a compares the obtained volume change amount with a threshold value for the volume change level, and determines whether or not the volume change exceeds the threshold value (step S09).

  When the volume change exceeds the threshold (Yes in step S09), the comparison determination unit 21 determines that the sound correction process is necessary, acquires the sound correction parameter corresponding to the detection result from the parameter storage unit 22 (step S10), A sound correction processing signal based on this parameter is output to the sound processing unit 23 (step S11). The sound processing unit 23 performs sound signal correction processing based on the sound correction processing signal (step S12).

  On the other hand, when the angle change amount does not exceed the threshold value (No in step S05), the angular velocity exceeds the threshold value (No in step S06), the change directions do not match (No in step S07), and the volume change is the threshold value. If it does not exceed (No in step S09), it is determined that the sound correction process is unnecessary, neither the sound correction process signal output nor the sound correction process is executed, and the process returns to step S05.

  As described above, in the present embodiment, the determination accuracy is improved by performing multi-step determination as in steps S05 to S07 and S09 in order to determine whether the sound correction processing is necessary. In other words, if the angle change amount does not exceed the predetermined threshold value, there is no need for correction processing in the first place. When the amount of angle change exceeds a predetermined threshold, correction processing may be necessary, but it is unknown whether the angle change reflects the user's intention. Therefore, in the present embodiment, the angular velocity is monitored by paying attention to the point that it is considered that the posture of the wireless microphone 10 is normally changed when it is intentionally changed. Thereby, it can be determined whether or not the change in posture is intended by the user. By monitoring the coincidence between the change direction of the angle and the volume, it is determined whether or not the frequency characteristic has changed greatly, and is used as an index of the necessity of correction processing. Further, the accuracy of determining whether or not correction processing is necessary can be improved by monitoring the volume change.

[1-3. effect]
(1) The wireless microphone system of this embodiment is a wireless microphone system that transmits and receives audio input to the wireless microphone 10 by radio waves, and includes an angle detection unit 13 that detects the angle and angular velocity of the wireless microphone 10, and angle detection. And an audio processing unit 23 that performs audio signal correction processing based on the detection result of the unit 13. Thereby, since the correction process of the frequency characteristic is performed according to the attitude change of the wireless microphone 10, the voice performance is improved, and a voice that is easier to hear can be realized.

(2) It further includes a volume detection unit 12 that detects the volume of the audio signal, and the audio processing unit 23 performs a correction process on the audio signal based on the detection results of the volume detection unit 12 and the angle detection unit 13. . Thereby, since not only the frequency characteristic according to the attitude | position change of the wireless microphone 10 but a correction process is performed also about a volume, the quality of an audio | voice improves and it can implement | achieve an audio | voice more easily heard.

(3) It further includes a parameter storage unit 22 in which the degree of correction associated with the detection results of the volume detection unit 12 and the angle detection unit 13 detected in advance is stored, and the voice processing unit 23 The audio signal is corrected based on the correction level corresponding to the detection result of the detection unit 13. Thereby, the effect of correction | amendment can be adjusted according to a user. In addition, since the correction process is automatically performed based on the detection result, it is possible to eliminate the burden of the operator performing the sound correction process with the mixer.

(4) A comparison determination unit 21 that compares the detection results of the sound volume detection unit 12 and the angle detection unit 13 with various threshold values, which are preset comparison references, and determines whether or not an audio signal correction process is necessary is further provided. I did it. As a result, the audio signal correction process is performed only when the correction process is necessary, so that unnecessary processes can be prevented.

(5) The comparison determination unit 21 determines whether or not the sound signal correction processing is necessary based on the angle change amount detected by the angle detection unit 13. In other words, if the detected amount of change in angle exceeds a predetermined threshold, it is determined that the audio signal may need to be corrected. If the detected angle does not exceed the predetermined threshold, correction is performed in the first place. Since there is no need for processing, it was determined that correction processing was unnecessary. Thereby, unnecessary processing can be prevented.

(6) The comparison / determination unit 21 determines whether or not the sound signal correction processing is necessary based on the angular velocity detected by the angle detection unit 13. That is, the determination is made based on a comparison between the angular velocity detected by the angle detector 13 and a predetermined threshold value. Thereby, it can be determined whether the change in the attitude of the wireless microphone 10 is an intention by the user or an unconscious one. In the case of an unintended posture change, the collected sound volume and frequency characteristics change unintentionally due to directivity characteristics and proximity effect characteristics, but the changes can be corrected. Further, by determining from the two viewpoints of the angle change amount and the angular velocity, it is possible to improve the accuracy of determining whether or not correction processing is necessary.

(7) The comparison determination unit 21 determines whether or not the sound signal correction processing is necessary based on the coincidence of the change direction of the angle and the volume. Thereby, when the change directions coincide, that is, when the frequency characteristic changes greatly, it can be determined that the correction process is necessary, so that it is possible to improve the accuracy of determining whether the correction process is necessary.

[2. Other Embodiments]
(1) In the first embodiment, the audio processing unit 23 is provided in the receiving device 20, but may be provided in a microphone. For example, in this case, the sound processing unit can be configured as an internal circuit of a microphone.

(2) In the first embodiment, since the degree of correction of the audio parameter is changed according to the detection result, the degree of correction is different if the detection result is different. When correction processing is necessary, such as when the predetermined threshold value is exceeded or when the angular velocity is within the predetermined threshold value, the frequency characteristic is corrected so that the frequency characteristic is uniformly the same as the posture at the predetermined angle. May be. The posture at the predetermined angle is not particularly limited, and for example, a reference posture at an angle of 0 ° can be given. By doing so, it is possible to realize a certain quality of sound.

(3) When the amount of angle change exceeds the threshold value, the frequency characteristic at an angle close to the reference posture by a predetermined angle may be corrected.

(4) In the first embodiment, the comparison / determination unit 21 uses the sound volume change amount, the angle change amount, the angular velocity, and the coincidence between the sound volume and the angle change direction as a determination criterion for determining whether or not the sound signal needs to be corrected. When it is determined that all of the determination criteria need correction processing, it is determined that audio signal correction processing is necessary. However, at least one or more determination criteria are selected from these determination criteria, and the selection is made. When it is determined that all the determination criteria have the necessity for correction processing, the audio signal correction processing may be determined.

(5) In the first embodiment, the volume detection unit 12 detects the volume and the volume comparison determination unit 21a monitors the volume change. However, the configuration of the volume detection unit 12 and the volume comparison determination unit 21a is the same. If not, it is within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Wireless microphone 11 Conversion part 12 Volume detection part 13 Angle detection part 20 Reception apparatus 21 Comparison determination part 21a Volume comparison determination part 21b Angle comparison determination part 22 Parameter storage part 23 Voice processing part 23a Volume change part 23b Sound quality change part

Claims (6)

A wireless microphone system that transmits and receives audio input to a microphone via radio waves,
An angle detector for detecting angle information of the microphone;
An audio processing unit that performs an audio signal correction process on the audio based on a detection result by the angle detection unit;
A volume detector for detecting the volume of the audio signal;
A parameter storage unit storing a correction degree corresponding to the detection result of the volume detection unit and the angle detection unit detected in advance;
The voice processing unit
Based on the detection results by the volume detection unit and the angle detection unit, the audio signal is corrected.
A wireless microphone system, wherein the audio signal is corrected based on the correction degree corresponding to the detection results of the volume detection unit and the angle detection unit . A wireless microphone system that transmits and receives audio input to a microphone via radio waves,
An angle detector for detecting angle information of the microphone;
An audio processing unit that performs an audio signal correction process on the audio based on a detection result by the angle detection unit;
A volume detector for detecting the volume of the audio signal;
A comparison determination unit that compares the detection result of the volume detection unit and the angle detection unit with a preset comparison reference and determines whether the correction process of the audio signal is necessary;
The wireless processing system according to claim 1, wherein the audio processing unit performs a correction process on the audio signal based on detection results of the volume detection unit and the angle detection unit. The comparison determination unit for comparing the detection results of the sound volume detection unit and the angle detection unit with a preset comparison reference and determining whether or not the sound signal correction processing is necessary. wireless microphone system as claimed in 1. The angle information includes a change amount of the angle of the microphone,
4. The wireless microphone system according to claim 2 , wherein the comparison determination unit determines whether or not the sound signal correction processing is necessary based on the change amount of the angle. 5. The angle information includes an angular velocity of the microphone,
The wireless microphone system according to any one of claims 2 to 4, wherein the comparison determination unit determines whether or not the sound signal correction processing is necessary based on the angular velocity. The wireless determination according to any one of claims 2 to 5 , wherein the comparison determination unit determines whether or not the sound signal correction processing is necessary based on the coincidence between the change direction of the angle and the volume. Microphone system.