JP2006203376A - Electronic camera, noise reducing device and noise reducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform appropriate noise reducing processing depending on an operation time of an operation means being a noise generating source. <P>SOLUTION: Any one of motors provided in this digital camera starts operation (YES in step S107). Before one second elapses after the motor starts its operation (NO in step S109), if the motor stops (YES in step S110), audio data just before the motor operation stop for only the operation time are re-read and taken into, thereby eliminating a noise. Also, if the motor operates for not less than one second (YES in step S109), the audio data are subjected to filtering processing, thereby eliminating a noise (step S116). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic camera that reduces noise generated with the operation of an operating means such as a mounted motor, a noise reduction device for reducing noise, and a noise reduction method.

Conventionally, for example, in a camera that records sound at the time of photographing together with a photographed image, a noise reduction device is installed to prevent noise from being mixed into the recorded sound by reducing noise generated with the operation of the zoom motor. Things have been proposed. This noise reduction device prevents the operation noise of the zoom motor from being recorded by attenuating the sound level detected by the microphone to a certain level during the operation of the zoom motor (see, for example, Patent Document 1). ).
JP-A-6-292048

  In this way, during the operation of the zoom motor, if the sound level detected by the microphone is attenuated to a certain level, if the operation time of the zoom motor is short, the lack of sound due to the sound being attenuated is recorded. Since it is short in time, the uncomfortable feeling during reproduction is negligible. However, when the operation time is long, the lack of sound due to the sound being attenuated and recorded becomes longer in time, so that the uncomfortable feeling during reproduction cannot be ignored. In other words, depending on the operating time of the operating means that is the source of noise, it may not be possible to perform appropriate noise reduction processing, and appropriate noise reducing processing can be performed without being affected by the operating time of the operating means. It was not a thing.

  The present invention has been made in view of such conventional problems, and an electronic camera, a noise reduction apparatus, and a noise reduction method capable of performing appropriate noise reduction processing according to the operation time of an operation means serving as a noise generation source. Is intended to provide.

  In order to solve the above-mentioned problem, in the electronic camera according to the first aspect of the present invention, there is provided an image pickup means for picking up a moving image, a detection means for detecting surrounding sounds at the time of image pickup by the image pickup means, and an image pickup by the image pickup means. Recording means for recording a moving image and sound detected by the detection means, operation means for generating noise in accordance with operation, and sound detected by the detection means during operation of the operation means, Noise reduction processing means for executing different noise reduction processing according to the operation time of the operation means.

  That is, the noise reduction processing means performs noise reduction processing on the sound detected by the detection means during the operation of the operation means, using a different noise reduction method depending on the operation time of the operation means. Therefore, it is possible to perform an appropriate noise reduction process without being affected by the operation time of the operation means serving as a noise generation source.

  In the electronic camera according to the second aspect of the present invention, the noise reduction processing is performed when the operation time of the operation means is less than a predetermined value, to the recording means for recording the sound during operation of the operation means. Including a recording prohibition process for prohibiting recording. Therefore, during the operation of the operation means, recording of the sound detected by the detection means to the recording means is prohibited, and recording of the sound detected during that time is lacking. However, since the recording prohibition process is a noise reduction process performed when the operation time of the operation means is less than a predetermined value, the lack of sound is short in time, and the sense of incongruity during reproduction can be ignored. .

  In the electronic camera according to the third aspect of the invention, the noise reduction processing is detected by the detection means during a non-operation of the operation means in a portion where recording is prohibited by the recording prohibition processing. A recording process for inserting the recorded voice into the recording means. Therefore, there is no noise generated by the operation of the operating means by inserting the sound detected by the detecting means while the operating means is not operating in the portion where recording is prohibited by the recording prohibiting process. In addition, it is possible to obtain a recording state in which there is no lack of sound.

  In the electronic camera according to the fourth aspect of the present invention, the sound detected by the detecting means during non-operation of the operating means is the sound detected immediately before or after the operation of the operating means. Including at least one. Therefore, in the portion where recording is prohibited by the recording prohibiting process, the detected voice immediately before and immediately after the operation of the operating means, or the average voice of the detected voice immediately before and after the operation is inserted and recorded. Thereby, it is possible to obtain a recording state in which there is no lack of noise and sound generated with the operation of the operation means, and there is no uncomfortable sound that is close in time.

  In the electronic camera according to claim 5, the noise reduction processing is detected by the detection means during the operation of the operation means when the operation time of the operation means is a predetermined time or more. A filtering process for filtering the sound, or a subtraction process for subtracting noise generated by the operation of the operation means from the sound. In other words, when there is a sense of incongruity during playback if the voice is lacked, such as when the operating time of the operating means is greater than or equal to a predetermined time, noise reduction processing is performed by filter processing or subtraction processing. It is possible to obtain a recording state without causing a sense of incongruity and free from noise generated by the operation of the operation means.

  In the electronic camera according to the sixth aspect, the acquisition means for acquiring the operation time of the operation means, and whether the operation time of the operation means acquired by the acquisition means is a predetermined time or more. Determination means for determining whether or not the noise reduction processing means is adapted to detect the sound detected by the detection means during the operation of the operation means when the determination means determines that the predetermined time has elapsed. On the other hand, the first noise reduction processing means for executing the first noise reduction processing and the sound detected by the detection means during the operation of the operation means when the determination means determines that the time is less than the predetermined time. On the other hand, second noise reduction processing means for executing second noise reduction processing different from the first noise reduction processing is included. Therefore, the first noise reduction process is executed when the operation time of the operation means is equal to or longer than the predetermined time, and the second noise reduction process different from the first noise reduction process is executed when the operation time is less than the predetermined time. Executed.

  In the electronic camera according to the seventh aspect of the present invention, an image pickup means for picking up a moving image, a detection means for detecting surrounding sound at the time of image pickup by the image pickup means, and a moving image picked up by the image pickup means Recording means for recording the sound detected by the detection means, a plurality of types of operation means for generating noise in accordance with the operation, and the sound detected by the detection means during the operation of the operation means, Noise reduction processing means for executing different noise reduction processing depending on the type of operation means.

  That is, the plurality of types of operation means that generate noise in accordance with the operation mounted on the electronic camera have different noise characteristics and operation time depending on the type. Therefore, if different noise reduction processing is executed depending on the type of operation means, the noise reduction processing is executed using different noise reduction methods depending on the nature of the operation means noise and operation time. Therefore, it is possible to perform appropriate noise reduction processing according to the nature of the noise and the operation time of the operating means that is a noise generation source.

  In the electronic camera according to the eighth aspect of the present invention, an imaging unit that captures a moving image, a detecting unit that detects surrounding sounds when the imaging unit captures an image, and a moving image captured by the imaging unit Recording means for recording the sound detected by the detecting means, operating means for generating noise in accordance with the operation, and during operation of the operating means, the sound detected by the detecting means to the recording means A recording prohibition processing means for prohibiting recording, and a voice including at least one of voices detected immediately before or immediately after the operation of the operating means is inserted into a portion where recording is prohibited by the recording prohibition processing means. And a recording processing means for recording. Therefore, in the portion where recording is prohibited by the recording prohibition process, the detected voice immediately before and immediately after the operation of the operating means, or the average voice of the detected voice immediately before and after the operation is inserted and recorded. Thereby, it is possible to obtain a recording state in which there is no lack of noise and sound generated with the operation of the operation means, and there is no uncomfortable sound that is close in time.

  According to a ninth aspect of the present invention, there is provided a noise reduction apparatus comprising: a detection means for detecting surrounding sound; and an operation means for generating noise in accordance with the operation. In addition, noise reduction processing means is provided that performs different noise reduction processing on the sound detected by the detection means during the operation of the operation means depending on the operation time of the operation means. That is, the noise reduction processing means performs noise reduction processing on the sound detected by the detection means during the operation of the operation means, using a different noise reduction method depending on the operation time of the operation means. Therefore, it is possible to perform an appropriate noise reduction process without being affected by the operation time of the operation means serving as a noise generation source.

  In the noise reduction device according to the tenth aspect of the present invention, noise disposed in a device including detection means for detecting surrounding sound and a plurality of types of operation means for generating noise in accordance with the operation. It is a reduction device, comprising noise reduction processing means for executing different noise reduction processing depending on the type of the operation means for the sound detected by the detection means during operation of the operation means.

  That is, the operation time of a plurality of types of operation means that generate noise in accordance with operations mounted on various devices differs depending on the type. Therefore, if different noise reduction processing is executed depending on the type of the operation means, the noise reduction processing is executed using a different noise reduction method depending on the operation time of the operation means. Appropriate noise reduction processing can be performed in accordance with the operating time of the operating means serving as the generation source.

  In the noise reduction device according to the eleventh aspect of the present invention, a detecting means for detecting surrounding sound, a recording means for recording the sound detected by the detecting means, and noise generated by the operation are generated. A noise reduction apparatus disposed in a device including an operation means for performing recording prohibition processing means for prohibiting recording of the sound detected by the detection means on the recording means during operation of the operation means; A recording processing unit that inserts a voice including at least one of the voices detected immediately before or immediately after the operation of the operating unit into a portion where the recording is prohibited by the recording prohibiting processing unit and records the voice on the recording unit; Therefore, in the portion where recording is prohibited by the recording prohibition process, the detected voice immediately before and immediately after the operation of the operating means, or the average voice of the detected voice immediately before and after the operation is inserted and recorded. Thereby, it is possible to obtain a recording state in which there is no lack of noise and sound generated with the operation of the operation means, and there is no uncomfortable sound that is close in time.

  The invention according to claim 12 is a noise reduction method in a device comprising detection means for detecting ambient sound and operation means for generating noise in accordance with the operation, wherein the operation means operates during the operation of the operation means. Different noise reduction processing is executed on the sound detected by the detecting means depending on the operating time of the operating means. Therefore, by performing this noise reduction processing, the same effects as those of the ninth aspect of the invention can be achieved.

  The invention according to claim 13 is a noise reduction method in a device comprising detection means for detecting ambient sound and a plurality of types of operation means for generating noise in accordance with the operation, and the operation of the operation means Different noise reduction processing is executed on the sound detected by the detection means depending on the type of the operation means. Therefore, by performing this noise reduction processing, the same effect as that of the invention of claim 10 can be obtained.

  According to a fourteenth aspect of the present invention, there is provided a device comprising: a detecting unit that detects surrounding sound; a recording unit that records the sound detected by the detecting unit; and an operating unit that generates noise in accordance with the operation. In the noise reduction method, during the operation of the operation means, a recording prohibition processing step for prohibiting recording of the sound detected by the detection means to the recording means, and recording prohibited by the recording prohibition processing step A recording processing step of inserting a sound including at least one of the sounds detected immediately before or immediately after the operation of the operation means into the portion and recording the sound on the recording means. Therefore, by performing the processing according to the described steps, the same effect as that of the invention of the eleventh aspect can be obtained.

  As described above, according to the electronic camera of the present invention, the noise reduction processing unit uses a different noise reduction method according to the operation time of the operation unit for the sound detected by the detection unit during the operation of the operation unit. Therefore, it is possible to perform appropriate noise reduction processing regardless of the operating time of the operating means that is a noise generation source. Therefore, it is possible to record the sound with appropriately reduced noise together with the moving image.

  In addition, according to the electronic camera of the present invention, the noise reduction processing unit performs different noise reduction processing on the sound detected by the detection unit during operation of the operation unit depending on the type of the operation unit. Therefore, it is possible to perform an appropriate noise reduction process according to the nature of the noise and the operating time of the operating means serving as the noise generation source. Therefore, it is possible to record the sound with appropriately reduced noise together with the moving image.

  In addition, according to the noise reduction apparatus of the present invention, the noise reduction processing means similarly applies to the sound detected by the detection means during the operation of the operation means according to the operation time of the operation means or the type of the operation means. Since noise reduction processing is performed using different noise reduction methods, it is possible to perform appropriate noise reduction processing regardless of the operating time of the operating means that is the noise generation source. It is possible to perform appropriate noise reduction processing according to the noise characteristics and operation time of the operating means.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a circuit configuration of a digital camera 1 according to an embodiment of the present invention. The digital camera 1 has a video recording function with sound and various functions such as AE, AWB, and AF. It is. That is, the lens unit 2 includes an optical system (not shown) such as a zoom lens and a focus lens, a zoom motor 3 and a focus motor 4 for driving the optical system, and a mechanical mechanism such as a mechanical aperture and a mechanical shutter ( An iris motor 5 for driving a mechanical aperture and a shutter motor 6 for driving a mechanical shutter are provided. Each of these motors 3 to 6 is connected to a motor driver 7, and the motor driver 7 drives each of the motors 3 to 6 according to a command from the CPU 8.

  The digital camera 1 has a CCD 9 as an image sensor. The CCD 9 is disposed on the optical axis of the lens unit 2, and the subject is imaged on the light receiving surface of the CCD 9 by the lens unit 2. The CCD 9 is driven based on a timing signal generated by the CCD driver 10 in accordance with a command from the CPU 8, and outputs an analog imaging signal corresponding to the optical image of the subject to the CPU 8. The CPU 8 executes photographing processing such as processing for removing noise included in the output signal of the CCD 9 by correlated double sampling and A / D conversion processing for converting the imaging signal from which noise has been removed to a digital signal.

  Then, in the still image shooting mode, the CPU 8 compresses the image data obtained by the shooting process, and finally makes the memory card 11 as a still image file of a predetermined format. In the moving image recording mode, a plurality of image data is sequentially compressed by the CPU 8 and recorded on the memory card 11 as a moving image file. The still image file and the moving image file recorded on the memory card 11 are read and expanded by the CPU 8 in response to a user's selection operation in the PLAY mode, and displayed on a liquid crystal monitor (not shown).

  The ROM 12 stores various programs for causing the CPU 8 to control each unit, for example, a program for AE, AF, AWB control, a moving image shooting program used in the moving image recording mode, a program shown in a flowchart described later, and the like. Has been.

  The digital camera 1 also includes a microphone (MIC) 13 that detects ambient sound. The audio signal output from the microphone 13 is amplified by the microphone amplifier 14, converted into digital data by the A / D converter 15, and temporarily stored in the buffer memory 16. The audio data read from the buffer memory 16 is filtered as necessary by a digital filter 17 whose operation is controlled by the CPU 8 as will be described later, and is input to the CPU 8. Then, the CPU 8 compresses the audio waveform data input from the digital filter 17 in the moving image recording mode, generates a moving image file with sound including the compressed audio data and the compressed moving image data, and records it on the memory card 11. The moving image file with audio recorded in the memory card 11 is reproduced by converting the audio data into an audio waveform when the moving image data is reproduced in the PLAY mode. Note that the timing of performing the audio recording is not limited to the time of moving image shooting, and may be during the recording operation in the still image shooting mode with audio, or during the recording operation in the recording mode or the after-recording mode. FIG. 2 is a conceptual diagram showing details of the buffer memory 16. The buffer memory 16 has an area A and an area B that each store audio data in a circulating manner. Each of the areas A and B has a storage capacity of 1 second, and the areas A and B are switched by the CPU 8, and sound data for 1 second is circulated and stored in one of the areas. Therefore, audio data is read from the areas A and B with a delay of 1 second.

  FIG. 3 is a conceptual diagram showing the characteristics of the digital filter 17. The digital filter 17 has a low-pass filter characteristic (b) as shown in the figure. Accordingly, when the sound waveform (a) detected by the microphone 13 includes the motor noise component N of each of the motors 3 to 6, the motor noise component N is removed by waveform shaping (c) by the digital filter 17. It is possible to generate the shaped waveform (d).

  In the present embodiment having the above configuration, when the user sets the moving image recording mode and performs a moving image recording instruction operation, the CPU 8 starts processing according to the flowchart shown in FIG. 4 based on the program. That is, an image capturing command from the CPU 8 is output to the CCD driver 10 (step S101), image capturing is started (step S102), and an audio capturing command from the microphone 13 is output to the buffer memory 16 (step S102). In step S103, voice capturing is started (step S104). Then, in the buffer memory 16, one of the areas A and B, for example, the area A is selected, and the audio data is cyclically stored in the area A (step S105). Further, the audio data circulated and stored in the area A is read out with a delay of 1 second (step S106), and taken in through the digital filter 17. At this time, since the digital filter 17 is in a stopped state, the audio data that is not subjected to the filtering process is sequentially taken into the CPU 8 with a delay of 1 second.

  Next, whether or not any of the motors 3 to 6 has started to be driven by the CPU 8 generating a drive command to the motor driver 7 based on a request from the user by an operation or a determination of the CPU 8 based on the shooting environment. Judgment is made (step S107). If the drive is not started, the process proceeds to step S114, which will be described later. Thereby, as described above, the audio data that is not subjected to the filter process is sequentially taken into the CPU 8 with a delay of 1 second.

  If any of the motors 3 to 6 starts driving (step S107; YES), the area currently used in the buffer memory 16, that is, the area A in this example is fixed, and the area A is moved to the area A. The circular storage is stopped, and the other storage area, in this case, the area B is switched to start the circular storage in the area B (step S108). Therefore, when the determination in step S107 is YES, as shown in FIG. 2 (1), the area A is a sound from the current time to one second before, and the noise accompanying the operation of the motors 3 to 6 is present. Audio data DC not included is stored, and no audio data is stored in region B.

  In addition, by executing the process of step S108, as shown in FIG. 2B, the audio data starts to be stored in the area B. At this time, any one of the motors 3 to 6 is already operating. For this reason, the area B stores the audio data DN including noise associated with the operation of the motor.

  Next, the CPU 8 determines whether or not 1 second has elapsed after any of the motors 3 to 6 starts operating based on the measurement value of the built-in timer (step S109) and starts the operation. It is determined whether the motor that has been stopped has stopped (step S110). If the motor stops (step S110; YES) before 1 second has elapsed since the motor started operation (step S109; NO), the region fixed in step S108, in this example, It is determined whether or not the reading of the audio data from the area A has been completed, that is, whether or not one second has elapsed since any of the motors 3 to 6 started operating (step S111). If the reading of the audio data from the area A has not been completed, the reading is continued without proceeding to the next step. At this time, as shown in FIG. 2 (2), since only the audio data DC not including noise is stored in the area A, the CPU 8 stores the audio data DC not including noise. Will be captured. FIG. 2 (2) shows the storage state at the time when it is determined that the reading of the audio data has been completed in step S111. In the area A, the motor operation starts one second before the motor starts operating. The audio data up to the time is stored, and the area B is in a state where the audio data is stored until 1 second elapses from the motor operation disclosure time.

  On the other hand, since the motor stopped before 1 second from the start of operation, the area B where the storage was started in step S108 is less than 1 second from the beginning as shown in FIG. 2 (2). The voice data DN including noise is stored in the area. Therefore, when it is determined in step S111 that the reading of the audio data has been completed, if the reading of the audio data from the area B is started as it is, the CPU 8 takes in the audio data DN including noise.

  Therefore, the voice data immediately before the motor operation is stopped is read again from the area fixed in step S108, which is the area A in this example, for the operation time of the motor (step S112). That is, as shown in FIG. 2 (2), if the motor operating time based on the measured value of the timer is “T”, the audio data immediately before the motor operation is stopped is read again from the area A for the time T. Capture. At this time, as described above, since only the audio data DC that does not include noise is stored in the area A, the CPU 8 takes in the audio data DC for the time T that does not include this noise. It will be. When the re-reading of the audio data for the time T from the area A in step S112 is completed, the audio data DN including noise from the area B is erased by the cyclic storage during the re-reading as shown in FIG. The audio data DC not including noise is stored for one second.

  In this state, reading is started from the voice data immediately after the motor is stopped in the area where the circular storage is started in step S108, in the case of the area B in this example (step S113). That is, the process of reading out the audio data circulated and stored in the area B with a delay of 1 second is started. At this time, since the audio data stored in the area B is audio data DC that has already been stored after the motor is stopped and does not include noise, the CPU 8 includes this noise. Audio data DC that have not been recorded are captured.

  Next, it is determined whether or not a moving image recording end command has been issued (step S114). If a moving image recording end command has not been issued, the processing from step S105 described above is repeated. At this time, since the area for storing the audio data in the buffer memory 16 is switched from the area A to the B in the processing in step S108, the audio data is cyclically stored in the area B in this step S105. In step S106, the audio data circulated and stored in this area B is read out with a delay of 1 second.

  On the other hand, if it is determined in step S109 that one second has elapsed after the motor has been operated and before the operation has stopped, the sound from the region fixed in step S108 at this time, in this example, region A Data reading ends. Accordingly, reading from the area where the circular storage is started in step S108, in this example, the area B is started (step S115). However, at this time, in the area B, as shown in FIG. 2 (4), audio data DN including noise is stored. Therefore, the operation of the digital filter 17 is started to filter the audio data read from the area B (step S116). As a result, the audio data from which noise has been removed by the filter processing is taken into the CPU 8.

  Subsequently, it is determined whether or not the motor has stopped (step S117). If the motor is not stopped, without continuing to the next step, the cyclic storage in the region B started in step S108 and the reading from the region B started in step S115 are continued, and the processing starts in step S116. Continue the filtering process. At this time, since the motor is continuing to operate, the audio data DN including noise is stored in the area B as shown in FIG. 2 (4), but the filtering process is performed. As a result, the CPU 8 takes in the audio data from which noise has been removed by the filter processing.

  If the motor stops operating (step S117; YES), it is determined whether or not 1 second has elapsed since the motor stopped operating (step S118), and the process proceeds to the next step until 1 second elapses. Without continuing, the filtering process started in step S116 is continued. That is, even if the motor stops operating, the area B stores audio data DN including noise for 1 second immediately before. Therefore, the filtering process for the audio data read from the region B is continued until 1 second has elapsed even if the motor stops operating. As a result, the audio data from which noise has been removed by the filter processing is taken into the CPU 8.

  When one second has elapsed since the motor stopped operating, only the audio data DC that does not contain noise is stored in the region B, and the filtering process is stopped (step S119). Thereafter, it is determined whether or not the above-mentioned moving image recording end command has been issued (step S114). If the moving image recording end command has not been issued, the processing from step S105 is repeated. At this time, the area where the audio data is stored in the buffer memory 16 is switched from the area A to B in the buffer memory 16 by the processing in step S108. Therefore, as described above, in this step S105, the audio data is stored in the area B. In step S106, the audio data that is cyclically stored in the area B is read out with a delay of 1 second.

  If the result of determination in step S114 is that a video recording end command has been issued, an image capture end command is output to the CCD driver 10 to terminate image capture (step S120), and from the microphone 13 A voice capturing end command is output to the buffer memory 16, and the voice capturing is terminated (step S121).

  The audio data and image data thus taken into the CPU 8 are compressed as described above and recorded in the memory card 11 as audio video files with audio including the compressed audio data and the compressed video data. It will be.

(Second Embodiment)
FIG. 5 is a flowchart showing a processing procedure in the second embodiment of the present invention. In the digital camera 1 according to the present embodiment, the operation time of the iris motor 5 and the shutter motor 6 is less than 1 second and constant. However, the operation time of the zoom motor 3 and the focus motor 4 is variable, and the minimum operation time exceeds 1 second.

  In this embodiment, when the user sets the moving image recording mode and performs a moving image recording instruction operation, the CPU 8 starts processing according to this flowchart based on the program. That is, the CPU 8 outputs an image capturing command from the CPU 8 to the CCD driver 10 (Step S201), starts capturing an image (Step S202), and outputs an audio capturing command from the microphone 13 to the buffer memory 16 (Step S201). In step S203, voice capturing is started (step S204). Then, in the buffer memory 16, one of the areas A and B, for example, the area A is selected, and the audio data is circularly stored in the area A (step S205). Further, the audio data circulated and stored in this area A is read out with a delay of 1 second (step S206) and taken in through the digital filter 17. At this time, since the digital filter 17 is in a stopped state, the audio data that is not subjected to the filtering process is sequentially taken into the CPU 8 with a delay of 1 second.

  Next, whether or not any of the motors 3 to 6 has started to be driven by the CPU 8 generating a drive command to the motor driver 7 based on a request from the user by an operation or a determination of the CPU 8 based on the shooting environment. Judgment is made (step S207). If the driving is not started, the process proceeds to step S214, which will be described later. As a result, as described above, the audio data that does not include noise and is not filtered is sequentially taken in with a delay of 1 second.

  If any of the motors 3 to 6 starts driving (step S207; YES), the currently used area of the buffer memory 16, that is, the area A in this example is fixed, and the circulation to the area A is performed. The storage is stopped and the other storage area, in this example, the area B is switched to start the circular storage in the area B (step S208). Therefore, when the determination in step S207 is YES, as shown in FIG. 2 (1), the region A contains the sound from the current time to one second before and the noise accompanying the operation of the motors 3-6. Audio data DC not included is stored, and no audio data is stored in region B.

  In addition, by executing the process of step S208, as shown in FIG. 2B, the audio data starts to be stored in the area B. At this time, any one of the motors 3 to 6 is already operating. For this reason, the area B stores the audio data DN including noise accompanying the operation of the motor.

  Next, the CPU 8 determines whether or not the motor that has started driving in step S107 is the iris motor 5 or the shutter motor 6 (step S209). If it is the iris motor 5 or the shutter motor 6, it is determined whether or not the iris motor 5 or the shutter motor 6 that has started the operation has stopped (step S210). If the iris motor 5 or the shutter motor 6 is stopped (step S210; YES), whether or not reading of the audio data from the area fixed in step S208, that is, the area A in this example, is completed. Then, it is determined whether or not 1 second has elapsed since any one of the motors 3 to 6 starts operating (step S211). If the reading of the audio data from the area A has not been completed, the reading is continued without proceeding to the next step. At this time, as shown in FIG. 2B, since only the audio data DC not including the noise of the iris motor 5 or the shutter motor 6 is stored in the area A, the CPU 8 has this noise. Audio data DC not included is captured.

  On the other hand, since the maximum operation time of the iris motor 5 and the shutter motor 6 is less than 1 second, the region B where the storage is started in step S208 is less than 1 second from the beginning as shown in FIG. That is, the audio data DN including the noise of the shutter motor 6 is stored in the area. Therefore, when it is determined in step S211 that the reading of the audio data has been completed, if the reading of the audio data from the area B is started as it is, the CPU 8 will receive the audio data DN including noise.

  Therefore, the audio data immediately before the motor operation is stopped is read again from the area fixed in step S208, which is the area A in this example, for the predetermined operation time of the shutter motor 6 (step S212). That is, as shown in FIG. 2B, if the operation time of the shutter motor 6 is “T”, the audio data immediately before the operation of the shutter motor 6 is read from the area A and read again for the operation time T. . At this time, as described above, since only the audio data DC that does not include noise is stored in the area A, the CPU 8 takes in the audio data DC for the time T that does not include this noise. It will be.

  In this state, reading is started from the sound data immediately after the shutter motor 6 is stopped in the area where the circular storage is started in step S208, in the case of the area B in this example (step S213). That is, the process of reading out the audio data circulated and stored in the area B with a delay of 1 second is started. At this time, since the audio data stored in the area B is audio data DC that has already been stored after the motor is stopped and does not include noise, the CPU 8 includes this noise. Audio data DC that have not been recorded are captured.

  Next, it is determined whether or not a moving image recording end command has been issued (step S214). If a moving image recording end command has not been issued, the processing from step S205 described above is repeated. At this time, since the area for storing the audio data in the buffer memory 16 is switched from the area A to B by the processing in step S208, the audio data is cyclically stored in the area A in step S205. In step S206, the audio data circulated and stored in this area B is read out with a delay of 1 second.

  On the other hand, if the result of determination in step S209 is that the motor that started operation is any of the zoom motor 3 and focus motor 4 other than the iris motor 5 and shutter motor 6 (step S209; NO), step S208 It is determined whether or not the reading of the audio data from the area fixed in (4) in the present example, the area A is completed (step S215). If the reading is not finished, the reading of the audio data from the area A fixed in step S208 is continued without proceeding to the next step. At this time, since only the audio data DC not including noise is stored in the area A, the audio data DC not including noise is captured by the CPU 8.

  When the reading of the audio data from the area A is completed, the reading from the area where the circular storage is started in step S208, which is the area B in this example, is started (step S216). However, at this time, in the area B, as shown in FIG. 2 (4), audio data DN including noise is stored. Therefore, the operation of the digital filter 17 is started to filter the audio data read from the area B (step S217). As a result, the audio data from which noise has been removed by the filter processing is taken into the CPU 8.

  Subsequently, it is determined whether or not the motor has stopped (step S213). If the motor is not stopped, without continuing to the next step, the cyclic storage to the area B started in step S208 and the reading from the area B started in step S216 are continued, and the process starts in step S216. Continue the filtering process. At this time, since the motor is continuing to operate, the audio data DN including noise is stored in the area B as shown in FIG. 2 (4), but the filtering process is performed. As a result, the audio data from which noise has been removed by the filtering process is taken into the CPU 8.

  If the motor stops operating (step S218; YES), it is determined whether or not 1 second has elapsed since the motor stopped operating (step S219), and the process proceeds to the next step until 1 second elapses. Without continuing, the filtering process started in step S216 is continued. That is, even if the motor stops operating, the area B stores audio data DN including noise for 1 second immediately before. Therefore, the filtering process for the audio data read from the region B is continued until 1 second has elapsed even if the motor stops operating. As a result, the audio data from which noise has been removed by the filter processing is taken into the CPU 8.

  Then, when one second has elapsed since the motor stopped operating, only the audio data DC that does not contain noise is stored in the region B, so the filtering process is stopped (step S220). Thereafter, it is determined whether or not the above-mentioned moving image recording end command has been issued (step S214). If the moving image recording end command has not been issued, the processing from step S205 is repeated. At this time, since the area for storing the audio data in the buffer memory 16 has been switched from the area A to the B in the processing in the step S208, the audio data is stored in the area B in the step S205 as described above. In step S206, the audio data that is circulated and stored in the region B is read out with a delay of 1 second.

  If the result of determination in step S214 is that a video recording end command has been issued, an image capture end command is output to the CCD driver 10 to terminate image capture (step S221), and from the microphone 13 A voice capture end command is output to the buffer memory 16 and the voice capture is terminated (step S222).

  In the second embodiment, since different noise reduction processing is performed according to the type of motor, appropriate noise reduction processing is also performed according to the nature of noise generated with the operation of each motor. It becomes possible.

  Further, in the embodiment, not only the recording of the sound detected during the motor operation is prohibited, but the sound immediately before the start of the motor operation is inserted into the portion where the recording is prohibited. You may make it perform only recording prohibition, without performing. Even in this case, when the operation time of the motor is short, there is no sense of incongruity during reproduction. Further, the voice immediately before the start of the motor operation is inserted in the portion where recording is prohibited, but the voice immediately after the operation or the average voice of the voice immediately before and after the operation may be inserted.

  Further, the noise reduction process is not limited to the noise reduction process shown in the embodiment, a subtraction process for subtracting a pre-stored noise component from the audio data, an addition process for adding waveform data having a phase opposite to the noise waveform, Other noise reduction processing such as attenuation processing for attenuating the level of sound including noise components can be used as appropriate. Furthermore, the present invention can be applied not only to cameras but also to various devices having a hard disk driven by a current waveform, various recording devices, and the like.

1 is a block diagram illustrating an electrical configuration of a digital camera to which an embodiment of the present invention is applied. It is a conceptual diagram which shows the memory structure and storage state transition of a buffer memory. It is a conceptual diagram which shows the characteristic of a digital filter. It is a flowchart which shows the process sequence in 1st Embodiment. It is a flowchart which shows the process sequence in 2nd Embodiment.

Explanation of symbols

1 Digital Camera 2 Lens Unit 3 Zoom Motor 4 Focus Motor 5 Iris Motor 6 Shutter Motor 7 Motor Driver 8 CPU
9 CCD
10 CCD driver 11 Memory card 12 ROM
13 Microphone 15 A / D converter 16 Buffer memory 17 Digital filter

Claims (14)

An imaging means for capturing a video;
Detecting means for detecting surrounding sounds at the time of imaging by the imaging means;
Recording means for recording the moving image picked up by the image pickup means and the sound detected by the detection means;
An operation means for generating noise along with the operation;
An electronic camera comprising: noise reduction processing means for executing different noise reduction processing on the sound detected by the detection means during the operation of the operation means depending on the operation time of the operation means.   The noise reduction process includes a recording prohibiting process for prohibiting recording of the sound on the recording unit during operation of the operating unit when an operating time of the operating unit is less than a predetermined value. 1. The electronic camera according to 1.   The noise reduction process includes a recording process in which a sound detected by the detecting means is inserted into a portion where recording is prohibited by the recording prohibiting process and recorded by the recording means while the operating means is not operating. The electronic camera according to claim 2.   4. The electronic camera according to claim 3, wherein the sound detected by the detecting means during non-operation of the operating means includes at least one of sounds detected immediately before or immediately after the operation of the operating means.   In the noise reduction process, when the operation time of the operation means is a predetermined time or more, a filter process for filtering the sound detected by the detection means during the operation of the operation means, or the operation of the operation means from the sound The electronic camera according to claim 1, further comprising a subtraction process for subtracting noise generated along with the electronic camera. Obtaining means for obtaining an operating time of the operating means;
Determination means for determining whether or not the operation time of the operation means acquired by the acquisition means is a predetermined time or more,
The noise reduction processing means includes
A first noise reduction processing unit that executes a first noise reduction process on the sound detected by the detection unit during operation of the operation unit when the determination unit determines that the predetermined time is exceeded; ,
When the determination means determines that the time is less than the predetermined time, a second noise reduction process different from the first noise reduction process is performed on the sound detected by the detection means during the operation of the operation means. 2. The electronic camera according to claim 1, further comprising second noise reduction processing means. An imaging means for capturing a video;
Detecting means for detecting surrounding sounds at the time of imaging by the imaging means;
Recording means for recording the moving image picked up by the image pickup means and the sound detected by the detection means;
A plurality of types of operation means for generating noise with the operation;
An electronic camera comprising: noise reduction processing means for executing different noise reduction processing depending on a type of the operation means for the sound detected by the detection means during operation of the operation means. An imaging means for capturing a video;
Detecting means for detecting surrounding sounds at the time of imaging by the imaging means;
Recording means for recording the moving image picked up by the image pickup means and the sound detected by the detection means;
An operation means for generating noise along with the operation;
During the operation of the operation means, recording prohibition processing means for prohibiting recording of the sound detected by the detection means to the recording means,
A recording processing unit that inserts a voice including at least one of voices detected immediately before or immediately after the operation of the operating unit into a portion where recording is prohibited by the recording prohibiting processing unit, and causes the recording unit to record the voice. An electronic camera characterized by A noise reduction device arranged in a device comprising detection means for detecting surrounding sound and operation means for generating noise in accordance with operation,
A noise reduction apparatus comprising: noise reduction processing means for performing different noise reduction processing on the sound detected by the detection means during operation of the operation means depending on the operation time of the operation means. A noise reduction device disposed in a device including detection means for detecting surrounding sound and a plurality of types of operation means for generating noise in accordance with operation,
A noise reduction apparatus comprising noise reduction processing means for executing different noise reduction processing on the sound detected by the detection means during the operation of the operation means depending on the type of the operation means. A noise reduction device arranged in a device comprising detection means for detecting ambient sound, recording means for recording sound detected by the detection means, and operation means for generating noise in accordance with the operation,
During the operation of the operation means, a recording prohibition processing means for prohibiting recording of the sound detected by the detection means to the recording means,
A recording processing unit that inserts a voice including at least one of voices detected immediately before or immediately after the operation of the operating unit into a portion where recording is prohibited by the recording prohibiting processing unit, and causes the recording unit to record the voice. A noise reduction device characterized by the above. A noise reduction method in a device comprising detection means for detecting surrounding sound and operation means for generating noise in accordance with operation,
A noise reduction method comprising: performing a noise reduction process that is different depending on an operation time of the operation unit on the sound detected by the detection unit during the operation of the operation unit. A noise reduction method in a device comprising a detection means for detecting surrounding sound and a plurality of types of operation means for generating noise in accordance with the operation,
A noise reduction method, wherein a noise reduction process that differs depending on a type of the operation means is executed on the sound detected by the detection means during the operation of the operation means. A noise reduction method in a device comprising detection means for detecting surrounding sound, recording means for recording sound detected by the detection means, and operation means for generating noise in accordance with the operation,
During the operation of the operating means, a recording prohibiting process step for prohibiting recording of the sound detected by the detecting means on the recording means;
A recording processing step of inserting a voice including at least one of voices detected immediately before or immediately after the operation of the operating means into a portion where recording is prohibited by the recording prohibiting processing step and recording the recording means on the recording means. A noise reduction method characterized by the above.

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