KR20010104867A - Apparatus for digital audio signal recording and playing for still camera - Google Patents

Abstract

The present invention digitally records a voice signal in conjunction with a shutter sound of a still camera, and allows the recorded audio signal to be reproduced according to a user's needs, thereby allowing the user to take a more realistic picture. A signal recording / reproducing apparatus.

A feature of the present invention is an operating unit having at least a recording mode selection button and a playback button for selecting recording and playback operations of a digital audio signal recording / reproducing apparatus, and a display unit for displaying an operation state of the digital audio signal recording / reproducing apparatus. A user interface unit including; A voice signal input unit for receiving analog and digital voice signals; An analog / digital converter for converting an analog voice signal input through a voice signal input unit into a digital voice signal; A buffer for buffering any one of a digital voice signal converted by an analog / digital converter and a digital voice signal input through the voice signal input unit when a recording mode selection button in the user interface unit is input; Shutter sound discrimination means for detecting and discriminating a shutter sound of a still camera among audio signals input from the audio signal input unit; A memory for storing a digital voice signal stored in a buffer when the shutter sound is determined by the shutter sound discrimination means; A digital / analog converter for restoring a digital voice signal stored in a memory to an analog voice signal when a play button in the user interface unit is input; An amplifier for amplifying the analog voice signal converted by the digital / analog converter to a level that can be identified by a user; An output unit for outputting an analog audio signal amplified by the amplifier to an external output device; A battery for supplying a driving power of the digital audio signal recording / reproducing apparatus and a backup power for maintaining the storage state of the digital audio signal stored in the memory; Detects that the recording mode selection button in the user interface is input, controls whether one of the digital voice signal input through the voice signal input unit and the digital voice signal converted through the analog / digital converter is buffered in the buffer, and the shutter sound is discriminated. When the shutter sound is determined by the means, the digital sound signal buffered in the buffer is controlled to be stored in the memory, and a central processing unit for displaying the operation state of the digital sound signal recording / reproducing device is included in the display unit.

The present invention is connected to a still camera, by recognizing the shutter sound generated when the user presses the shutter for shooting, so that it is possible to record the surrounding voice signal for a predetermined time based on the time when the shutter sound occurs, There is an advantage that can perform a stable shooting operation.

Description

Apparatus for digital audio signal recording and playing for still camera

The present invention relates to a digital audio signal recording / reproducing apparatus for a still camera, and more particularly, to digitally record a voice signal in association with a shutter sound of a still camera and to reproduce the recorded voice signal according to a user's needs. The present invention relates to a digital audio signal recording / reproducing apparatus for still cameras, which enables a more realistic picture to be taken.

In addition, the present invention relates to a digital audio signal recording / reproducing apparatus for a still camera, which makes it possible to vary and store the compression ratio of the digital audio signal according to the remaining amount of memory in digitizing and recording the audio signal.

In general, a still camera is a representative device for capturing a still image by photographing a subject, and is classified into an analog still camera and a digital still camera. In a typical case, an analog still camera may obtain a still picture through a medium called "film", and a digital still camera may obtain a still picture through a medium called "memory".

Since analog cameras do not have a separate recording / playback function, a reference is added to a printed picture after shooting, or a picture is scanned and saved to record a voice signal after recording to explain the situation at the time of shooting. / Add a voice through the playback device.

In order to solve this inconvenience, a digital still camera with a built-in digital recorder capable of recording / playing has been proposed. That is, the digital still camera presented in Korean Patent Laid-Open Publication No. 1999-49718 (published date: 1999. 07. 05) (name of the invention: a digital camera capable of voice recording / playback) has a voice recording / playback function. It is to provide an additional function that allows the user to record the surrounding voice at the time of shooting, and as the user operates the record button and the play button, the voice signal is recorded or the recorded voice is reproduced.

On the other hand, Korean Patent Publication No. 1999-51305 (published: 1999. 07. 05) (name of the invention: a digital recording device) is a portable recording device is presented. The conventional digital recording apparatus selects any one of a tuned radio input, an analog input, and a digital input, converts an analog signal into a digital signal, converts a file type, and stores the converted file type signal in a memory. As a result, the user can carry and record the external voice as needed while carrying the digital recording device.

However, according to the conventional still camera, the following problem (s) occur.

In other words, there was no recording function in the analog still camera. Therefore, the user has to carry the still camera and the recording device separately, which is inconvenient.

In addition, when the still camera and the recording device are separated, it is difficult to perform the normal shooting operation because the recording device must be operated during shooting.

In addition, when purchasing a digital still camera with a built-in recording device, a consumer who does not need a recording device, in addition to the digital still camera, when purchasing a digital still camera, the result of the additional purchase of the recording device, resulting in economic loss to the consumer do.

In addition, in the case of a digital still camera with a recording device, since the recording device is a built-in type, the recording device cannot be dedicated to another still camera. Thus, the recording apparatus is inefficiently operated.

Accordingly, an object of the present invention is to solve such a problem (s), and an object of the present invention is to connect to a still camera and recognize a shutter sound generated when a user presses the shutter for shooting to determine a time point at which a shutter sound occurs. The present invention provides a digital audio signal recording / reproducing apparatus for a still camera that can record a surrounding audio signal for a predetermined time, so that a convenient and stable photographing operation can be performed.

Another object of the present invention is to provide a digital audio signal recording / reproducing apparatus for a still camera that checks the remaining amount of memory and adjusts and stores the compression ratio of the audio signal according to the remaining amount of memory in recording the audio signal. have.

Still another object of the present invention is to provide a digital audio signal recording / reproducing apparatus in a detachable form so that it can be dedicated to any still camera, thereby improving the use efficiency of the digital audio signal recording / reproducing apparatus. The present invention provides a digital audio signal recording / reproducing apparatus.

1 is a perspective view for explaining a schematic structure of a digital audio signal recording / reproducing apparatus applied to the present invention;

2 is a schematic block diagram of a digital audio signal recording / reproducing apparatus applied to the present invention.

3 is a detailed block diagram of the main part of FIG. 2.

<Description of the code | symbol about the principal part of drawing>

100: digital audio signal recording / playback device

101: main body 102: support

103: hand grip 104: peripheral device interface

105: Record Mode Selection Button 106: Play Button

107: Compression ratio adjustment button 108: Shutter tone pattern input button

109: shutter sound removing selection button 110: display unit

111: memory 112: audio signal input unit

113: speaker 114: still camera

116: built-in microphone 117: battery

118: central processing unit 121: voice signal compression unit

122: buffer 123: expansion unit

127: shutter sound determination unit 128: comparator

129: user interface unit

A feature of the present invention for achieving such an object (s) is a digital audio signal recording / reproducing apparatus which is capable of recording and reproducing a speech signal in connection with a still camera: recording and recording of a digital audio signal recording / reproducing apparatus; A user interface section including an operation section having at least a recording mode selection button and a playback button for selecting a playback operation, and a display section for displaying an operation state of the digital audio signal recording / reproducing apparatus; A voice signal input unit for receiving analog and digital voice signals; An analog / digital converter for converting an analog voice signal input through the voice signal input unit into a digital voice signal; when the recording mode selection button in the user interface is input, the digital voice signal and the voice signal input by the analog / digital converter are input. A buffer for buffering any one of the digital voice signals input through the unit; Shutter sound discrimination means for detecting and discriminating a shutter sound of a still camera among audio signals input from the audio signal input unit; A memory for storing a digital voice signal stored in a buffer when the shutter sound is determined by the shutter sound discrimination means; A digital / analog converter for restoring a digital voice signal stored in a memory to an analog voice signal when a play button in the user interface unit is input; An amplifier for amplifying the analog voice signal converted by the digital / analog converter to a level that can be identified by a user; An output unit for outputting an analog audio signal amplified by the amplifier to an external output device; A battery for supplying a driving power of the digital audio signal recording / reproducing apparatus and a backup power for maintaining the storage state of the digital audio signal stored in the memory; Detects that the recording mode selection button in the user interface is input, controls whether one of the digital voice signal input through the voice signal input unit and the digital voice signal converted through the analog / digital converter is buffered in the buffer, and the shutter sound is discriminated. When the shutter sound is determined by the means, the digital sound signal buffered in the buffer is controlled to be stored in the memory, and a central processing unit for displaying the operation state of the digital sound signal recording / reproducing device is included in the display unit.

Here, it is preferable that the display unit displays the current recording state and the remaining recording time according to the remaining amount of memory.

The voice signal input unit may include digital line connection means for receiving a digital voice signal, an external microphone connection means for connecting an external microphone, a wireless microphone connection means for connecting a wireless microphone, and an analog voice signal input. And a built-in microphone for receiving a shutter sound of a still camera. The digital voice signal recording / reproducing apparatus includes a digital voice signal and an analog voice signal inputted through the voice signal input unit of the central processing unit. It is preferable to further include a switching unit for switching the transfer to the analog-to-digital converter and the buffer according to the control.

The shutter sound discrimination unit may further include: a shutter sound determination unit for filtering a noise component among voice signals input by the built-in microphone and outputting a shutter sound discrimination result; The shutter sound determining unit may include a comparator for determining the shutter sound by comparing the voice signal from which the noise component is removed from the shutter sound determination unit with a previously stored pattern of the reference shutter sound.

In this case, the user interface unit may further include a shutter sound pattern input button for updating a reference shutter sound previously stored in the comparator; The shutter sound determination unit may remove a noise component from a voice signal input through a built-in microphone for a predetermined time after the shutter sound pattern input button is input under the control of the central processing unit, and output the noise component to a comparator; The comparator may analyze the pattern of the voice signal input from the shutter sound determiner to replace the analyzed pattern with a previously stored reference shutter sound.

In addition, the memory, under the control of the central processing unit, gives the digital audio signal provided from the buffer the same number as the sequence number of the captured image captured by the still camera, assigns the address to be stored, and assigns the assigned number. And the address of the voice signal and at the same time it is desirable to store the digital voice signal at the assigned address.

In addition, the external output device preferably includes at least one or more of a headphone and a speaker.

It is also possible to connect to a digital voice signal recording / reproducing apparatus, and further comprising a peripheral interface unit for interfacing with a peripheral device having a function of editing a digital voice signal; Preferably, the central processing unit outputs the digital voice signal stored in the memory to the peripheral device in response to a request of the peripheral device.

At this time, the peripheral device preferably comprises a personal computer.

In addition, the digital audio signal recording / reproducing apparatus includes: a compression ratio adjusting button provided in a user interface unit for allowing a user to select a compression ratio of the digital audio signal; A voice signal compressor for compressing the digital voice signal converted by the analog / digital converter and outputting the compressed voice signal to a buffer; A decompression unit for decompressing the compressed voice signal output from the memory by the play button and outputting the decompressed audio signal to the digital / analog converter; The central processing unit controls the voice signal compression unit to compress the digital voice signal in response to the compression rate input by the user by the compression rate adjustment button in the recording mode, and the digital voice signal before the compression of the compressed voice signal in the playback mode. It is desirable to control the stretcher for regeneration.

In addition, the digital audio signal recording / reproducing apparatus includes a main body and a supporting portion; The main body is equipped with a speaker for outputting the audio signal to be reproduced on the front side, an operation unit including a recording mode selection button, a playback button and a compression ratio adjustment button on the rear side, and an operation state of the digital audio signal recording / reproducing apparatus. A voice signal input unit including a display unit and a plurality of jacks for receiving external voices is installed, and a memory for storing digital voice signals is built in the lower part of the main body, and a peripheral device interface unit is installed at a side thereof. Become; The support part is installed in a lower part of the still camera in a state where the still camera is seated on the upper end, and a fastening member is installed to support and fix the still camera. It is preferable that a built-in microphone is built in the shutter sound detection area so that the shutter sound can be detected, and a battery for supplying driving power of the digital voice signal recording / reproducing apparatus and backup power of the memory is built in a predetermined position.

In this case, the user may further include a hand grip attached to the side of the main body to prevent the digital voice signal recording / reproducing device from being separated when the user attaches the digital voice signal recording / reproducing apparatus.

Hereinafter, exemplary embodiment (s) of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a perspective view illustrating a schematic structure of a digital audio signal recording / reproducing apparatus applied to the present invention, and FIG. 2 is a schematic block diagram of a digital audio signal recording / reproducing apparatus applied to the present invention. 3 shows a detailed block diagram of the main part of FIG. 2.

Referring to the configuration of the present invention with reference to Figures 1 to 3 as follows.

First, referring to FIG. 1, a configuration of a digital audio signal recording / reproducing apparatus applied to the present invention will be described. The digital audio signal recording / reproducing apparatus 100 having a substantially 'b' shape has a main body 101 and a support unit. Can be divided into (102).

A hand grip 103 is attached to the side of the main body 101 so that the user can easily attach the device 100, and the voice signal stored in the device 100 can be edited in a peripheral device such as a personal computer. A peripheral device interface unit (eg, a USB port, etc.) 104 is installed to interface with the peripheral device.

In addition, the rear of the main body 101, user-operated various function buttons (recording mode selection button 105, playback button 106, compression ratio adjustment button 107, shutter sound pattern input button 108, shutter sound removal A user interface unit including an operation unit configured with a selection button 109, etc., and a display unit (for example, a liquid crystal display device) 110 for displaying a current operation state of the apparatus 100 so that a user can easily identify it. And a memory (eg, flash memory, etc.) 111 for storing the acquired voice signal is installed, and a plurality of jacks (digital line jack, external microphone jack, wireless microphone) for receiving an external voice signal Jack, analog input jack, etc.) is provided with a voice signal input unit 112.

In addition, an external output device 113 such as a speaker of stereo channels R-ch and L-ch is installed on the front surface of the main body 101.

In addition, the support 102 is provided with a fastening member 115 which is fastened to a coupling groove formed in the bottom of the still camera 114 to support the still camera 114 when the still camera 114 is to be mounted thereon. The built-in microphone 116 is installed at a point adjacent to the fastening member 115 to detect the shutter sound and the ambient sound of the still camera 114, and the driving power of the device 100 and the voice data stored in the memory 111 are provided. A battery 117 is provided for supplying backup power to maintain the storage state of the battery.

Here, the voice signal input unit 112 includes a plurality of jacks and a built-in microphone 116.

Meanwhile, referring to FIG. 2, the internal structure of the digital audio signal recording / reproducing apparatus according to the present invention will be described. The central processing unit 118 uses the digital audio signal recording / reproducing apparatus 100 according to a predetermined program. Overall control.

The voice signal input unit 112 includes a digital voice signal input through a digital line, an analog voice signal input through an analog line, an analog voice signal input from an external microphone, an analog voice signal input from a wireless microphone, and a built-in signal. The shutter sound input from the microphone 116 is interfaced to the digital audio signal recording / reproducing apparatus 100.

The switching unit 119 selectively outputs any one of various types of analog or digital voice signals input through the voice signal input unit 112. In this case, the switching unit 119 outputs the analog voice signal input through the voice signal input unit 112 to the analog / digital converter 120, and the digital voice signal input through the voice signal input unit 112 is stored in memory ( 111).

The analog / digital converter 120 converts the analog voice signal input through the switching unit 119 into a digital voice signal.

The voice signal compressor 121 compresses the digital voice signal output from the analog / digital converter 120 or the digital voice signal input through the digital line in the voice signal input unit 112 at a compression rate set by the user.

The buffer 122 temporarily stores the compressed voice signal compressed by the voice signal compression unit 121. In this case, the buffer 122 is preferably a ring buffer, and the shutter sound is recognized while sequentially buffering the voice signal input through the voice signal input unit 112 after the user inputs the recording mode selection button 105. The voice signal stored in the buffer 122 is transmitted to the memory 111 from several seconds before to several seconds after the viewpoint.

The memory 111 receives and stores the compressed voice signal temporarily stored in the buffer 122.

The peripheral device interface 104 is a component for interfacing the digital voice signal recording / reproducing apparatus 100 and a peripheral device (for example, a personal computer, etc.), and edits the digital voice signal stored in the memory 111 in the peripheral device. To control the status of output to peripheral devices.

The decompression unit 123 decompresses (decompresses) the compressed voice signal in order to reproduce the digital compressed voice signal stored in the memory 111.

The digital-to-analog converter 124 demodulates the digital voice signal decompressed by the decompression unit 123 into an analog voice signal.

The amplifying unit 125 amplifies the analog voice signal demodulated by the digital-to-analog converter 124 to a predetermined level so that the user can audibly identify it.

The output unit 126 outputs the analog audio signal amplified by the amplifier 125 to an external output device (for example, headphones, speakers, etc.) 113.

The shutter sound determination unit 127 removes a noise component of the input voice signal to determine the shutter sound from various voice signals input through the internal microphone 116 in the voice signal input unit 112 and provides the comparator 128 to the comparator 128. At the same time, the result information corresponding to the result compared by the comparator 128 is provided to the CPU 118. That is, the shutter sound determination unit 127 removes the noise component of the voice signal input through the built-in microphone 116 and transmits it to the comparator 128, and the voice signal input as a result of the comparison by the comparator 128 is the shutter sound. Is determined, the predetermined result signal is output to the central processing unit 118.

The comparator 128 compares the voice signal of each section provided by the shutter sound determination unit 127 with a pre-stored reference shutter sound and provides the result of the comparison to the shutter sound determination unit 127.

The user interface unit 129 includes various function buttons 105 to 109 so that a user can operate various operations of the digital audio signal recording / reproducing apparatus 100, and displays an operation state of the device by the user's operation. It includes a display unit 110 to.

The battery 117 supplies driving power for driving the device 100 and backup power for maintaining a storage state of data stored in the memory 111.

On the other hand, with reference to Figure 3 will be described in more detail with respect to the main components of Figure 2, the user interface unit 129, as described above, the compression ratio adjustment button 107, the recording mode selection button 105 and the playback button ( 106, a function button such as a shutter sound pattern input button 108 and a shutter sound removal selection button 109, and a display unit 110 for displaying various information such as recording status and remaining memory time.

At this time, when the user adjusts the compression rate using the compression rate adjustment button 107, the user interface unit 129 outputs the compression rate information set by the user to the central processing unit 111 to output a voice signal at the compression rate set by the user. Control to compress and store, and accordingly, the central processing unit 111 delivers the compressed voice signal through the voice signal compression unit 121 to the manager 130 in the memory 111 to store the corresponding voice signal. To control.

In addition, as the user operates the recording mode selection button 105, the voice signal is temporarily transmitted to the memory 111 before and after a predetermined time from the time when the shutter sound is detected, and at this time, the voice signal in the memory 111. Stores the storage number, allocates the storage address of the memory 111, and temporarily delays the storage state until the storage address is stored in the storage address. At this time, the display unit 110 of the user interface unit 129 displays the recording state and the remaining time of the memory 111.

In addition, as the user manipulates the playback button 106, the central processing unit 118 detects this button signal and outputs a playback signal to the memory 111, and the memory 111 of the central processing unit 118 In response to the playback signal, the voice signal stored at the corresponding address is detected and provided to the decompression unit 123 or the peripheral device interface unit 104.

In addition, as the user operates the shutter sound pattern input button 108, the shutter sound input through the built-in microphone 116 is stored as reference pattern data in a temporary memory in the comparator 128.

In addition, when the voice signal stored in the buffer 122 is stored in the memory 111 as the user operates the shutter sound removing selection button 109, the shutter sound that may be included in the voice signal is processed or removed as the background sound. The state to be determined is determined.

Referring to the operation of the present invention having such a configuration as follows.

First, after the user sets the still camera 114 on the support 102 of the digital audio signal recording / reproducing apparatus 100, the fastening member 115 formed on the support 102 is coupled to the still camera 114. When the still camera 114 is fastened to the built-in microphone 116, the built-in microphone 116 installed in the support 102 is positioned within a range capable of detecting the shutter sound of the still camera 114.

In addition, when the user connects any device for receiving a voice signal, such as a digital line or an external microphone, a wireless microphone or an analog line, to the voice signal input unit 112, the voice signal input unit 112 may record a voice signal that the user wants to record. Enters the standby state.

In the initialization process, the user selects the shutter sound pattern input button 108 in the user interface unit 129, operates the shutter a plurality of times, generates a reference shutter sound pattern, and then compares the pattern data with the comparator 128. Store in temporary memory Through this process, the shutter sound learning process ends.

Then, when the user selects the recording mode selection button 105 of the main body 101, the external voice signal input by each input means (digital line, external microphone, wireless microphone, analog line, etc.) is a voice signal input unit After passing through the switch 112 to the switching unit 119, the central processing unit 118 detects the contact state of the jack and plug in the voice signal input unit 112 to detect the signal source of the currently input voice signal, The switching unit 119 is controlled to selectively output any one input source of a digital line, an external microphone, a wireless microphone, and an analog line. At this time, when the audio signal input through the voice signal input unit 112 is determined as the digital voice signal input through the digital line, the CPU 118 controls the switching unit 119 to input the voice signal into the voice signal. If it is controlled to be transmitted directly to the compression unit 121, and it is determined that the input voice signal is the remaining voice signal except the digital voice signal, all of the corresponding voice signals are passed through the analog-to-digital converter 120 and the voice signal compression unit 121 Control to be entered.

The analog-to-digital converter 120 converts the input analog voice signal into a digital voice signal, and the converted digital voice signal is compressed by the voice signal compression unit 121 according to a preset compression program. At this time, the digital voice signal input through the digital line is also compressed by the voice signal compression unit 121. Here, the user may adjust the compression rate using the compression rate adjustment button 107 in the user interface unit 129, and the voice signal compression unit 121 compresses the voice signal according to the compression rate set by the user.

The voice signal compressed by the voice signal compression unit 121 is temporarily stored in the buffer 122. In this case, the buffer 122 is configured as a ring buffer and stores the input digital voice signal in units of bits. When the storage capacity of '8 bits' is allocated, data is stored from the first to eighth bits, and then new data is stored after deleting data already stored in the first bit.

On the other hand, the built-in microphone 116 detects the shutter sound or the ambient sound generated from the still camera 114 and provides it to the shutter sound determination unit 127, wherein the shutter sound determination unit 127 is input voice signal After removing the noise component from the signal, the pattern of the pure speech signal is detected, and the pattern of the detected speech signal is provided to the comparator 128.

The comparator 128 compares the pattern of the voice signal provided from the shutter sound determiner 127 with the pattern data corresponding to the pre-stored reference shutter sound to determine whether the currently input voice signal pattern is a shutter sound or an ambient sound. . At this time, when it is determined that the input voice signal is a shutter sound, the comparator 128 outputs a predetermined recognition signal to the shutter sound determination unit 127, and the shutter sound determination unit 127 recognizes the recognition applied from the comparator 128. In response to the signal, a predetermined control signal indicating that the shutter sound has been detected is transmitted to the CPU 118.

The central processing unit 118 outputs a control signal to the buffer 122 according to the control signal provided from the shutter sound determination unit 127 to determine the current time point at which the shutter sound is determined among the bits of the digital voice signal stored in the buffer 122. On the basis of this command, the data of several seconds before and several seconds later are stored in the memory 111. Accordingly, the voice signal for a predetermined time stored in the buffer 122 is stored in the memory 111.

Meanwhile, the manager 130 in the memory 111 allocates and stores the serial number of the voice signal to be stored at present, so that the user can easily recognize the relation between the corresponding voice signal and the captured image during playback. do.

The manager 130 allocates a memory area by designating an address of a corresponding voice signal to which a serial number is assigned, and stores the voice signal at the assigned address. At this time, the central processing unit 118 displays the recording state on the display unit 110 in the user interface unit 129, the manager 130 in the memory 111, the user interface information about the remaining amount of the current memory 111 The display unit 110 allows the user to easily check the remaining time of the memory 111 through the display unit 110. In addition, the user may adjust the compression ratio of the voice signal corresponding to the remaining time of the memory 111 displayed on the display unit 110, thereby increasing the use efficiency of the memory 111.

In this case, as the user inputs the shutter sound removing selection button 109, the shutter sound that may be included in the voice signal input from the voice signal input unit 112 may be processed or deleted as the background sound.

On the other hand, when reproducing a voice signal stored in the memory 111, the central processing unit 118 determines whether the digital voice signal recording / reproducing device 100 is currently connected to a peripheral device (personal computer, etc.) to the peripheral device. When connected, the voice signal stored in the memory 111 is provided to the peripheral device through the peripheral device interface unit 129. Accordingly, the user can edit the voice signal through a peripheral device such as a personal computer.

In addition, when the current digital audio signal recording / reproducing apparatus 100 is not connected to the peripheral device, the central processing unit 118 provides the audio signal stored in the memory 111 to the decompression unit 123 to provide the audio signal. Decompress it. Thereafter, the decompressed digital voice signal is converted into an analog voice signal by the digital-to-analog converter 124, and is amplified to a level that can be identified by the user through the amplifier 125, and then output. The unit 126 is output to an external output device such as a headphone or a speaker. Accordingly, the user can reproduce the voice signal stored in the memory 111.

As described above, although the specific embodiment (s) have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiment (s), but should be defined by the claims below and equivalents thereof.

As a result, according to the digital audio signal recording / reproducing apparatus for still cameras according to the present invention, the following advantage (s) occurs.

In other words, by connecting to a still camera, it recognizes the shutter sound generated when the user presses the shutter for shooting and allows the user to record the surrounding audio signal for a predetermined time based on the time when the shutter sound is generated. Shooting operation can be performed.

Further, in recording the audio signal, the remaining amount of the memory can be checked and the compression rate of the audio signal can be adjusted and stored according to the remaining amount of memory, thereby increasing the use efficiency of the memory.

Further, by configuring the digital audio signal recording / reproducing apparatus in a detachable form so that it can be dedicated to any still camera, the use efficiency of the digital audio signal recording / reproducing apparatus is improved.

Claims (12)

In a digital audio signal recording / reproducing apparatus connected to a still camera to record and play back audio signals: A user interface including an operation unit having at least a recording mode selection button and a playback button for selecting recording and playback operations of the digital audio signal recording / reproducing apparatus, and a display unit for displaying an operation state of the digital audio signal recording / reproducing apparatus; part; A voice signal input unit for receiving analog and digital voice signals; An analog / digital converter for converting an analog voice signal input through the voice signal input unit into a digital voice signal; A buffer for buffering any one of the digital voice signal converted by the analog / digital converter and the digital voice signal input through the voice signal input unit when the recording mode selection button in the user interface unit is input; Shutter sound discrimination means for detecting and discriminating a shutter sound of said still camera from among audio signals input from said audio signal input unit; A memory for storing the digital voice signal stored in the buffer when the shutter sound is determined by the shutter sound discrimination means; A digital-to-analog converter that restores the digital voice signal stored in the memory to an analog voice signal when the play button in the user interface unit is input; An amplifier for amplifying the analog voice signal converted by the digital / analog converter to a level that can be identified by a user; An output unit for outputting the analog voice signal amplified by the amplifier to an external output device; A battery for supplying a driving power of the digital audio signal recording / reproducing apparatus and a backup power for maintaining a storage state of the digital audio signal stored in the memory; And One of the digital voice signal input through the voice signal input unit and the digital voice signal converted through the analog / digital converter is buffered in the buffer by detecting that the recording mode selection button in the user interface unit is input. And controlling the digital sound signal buffered in the buffer to be stored in the memory when the shutter sound is determined by the shutter sound discrimination means, and displaying the operation state of the digital sound signal recording / reproducing apparatus on the display unit. Digital audio signal recording / playback device for a still camera comprising a central processing unit. The method of claim 1, wherein the display unit, And recording and reproducing the still audio recording time according to the remaining amount of memory. The method of claim 1, The voice signal input unit may include a digital line connection unit for receiving a digital voice signal, an external microphone connection unit for connecting an external microphone, a wireless microphone connection unit for connecting a wireless microphone, and an analog voice signal input unit. Analog line connection means, and a built-in microphone for receiving the shutter sound of the still camera, The digital voice signal recording / reproducing apparatus switches the transfer of the digital voice signal and the analog voice signal input through the voice signal input unit to the analog / digital converter and the buffer under the control of the CPU. Digital audio signal recording / reproducing apparatus for a still camera, characterized in that it further comprises a switching unit. The method of claim 3, wherein the shutter sound discrimination means, A shutter sound determination unit for filtering a noise component among voice signals input by the built-in microphone and outputting the shutter sound discrimination result; And And a comparator for determining a shutter sound by comparing a voice signal from which the noise component output from the shutter sound determination unit is removed with a previously stored pattern of a reference shutter sound. The method of claim 4, wherein The user interface unit may further include a shutter sound pattern input button for updating a reference shutter sound previously stored in the comparator; The shutter sound determination unit may remove a noise component from a voice signal input through the built-in microphone for a predetermined time after the shutter sound pattern input button is input under the control of the central processing unit, and output the noise component to the comparator; And the comparator analyzes the pattern of the voice signal input from the shutter sound determiner and stores the analyzed pattern by replacing the previously stored reference shutter sound with the previously stored reference shutter sound. The method of claim 1, wherein the memory, Under the control of the CPU, the digital voice signal provided from the buffer is given the same number as the sequence number of the captured image photographed by the still camera, the address to be stored is allocated, and the assigned number is assigned. And storing the address of the audio signal and simultaneously storing the digital voice signal at the assigned address. The method of claim 1, wherein the external output device, Digital audio signal recording / playback device for still cameras comprising at least one of headphones and speakers. The method of claim 1, A peripheral interface unit connectable to said digital audio signal recording / reproducing apparatus, said peripheral apparatus having an interface for editing said digital audio signal; And the central processing unit is configured to output the digital audio signal stored in the memory to the peripheral device in response to a request of the peripheral device. The method of claim 8, wherein the peripheral device, Digital audio signal recording / playback device for still cameras, including a personal computer. According to claim 1, wherein the digital audio signal recording / reproducing apparatus, A compression rate adjustment button installed in the user interface to allow a user to select a compression rate of the digital voice signal; A voice signal compressor for compressing the digital voice signal converted by the analog / digital converter and outputting the compressed voice signal to the buffer; And A decompressing unit which decompresses the compressed voice signal output from the memory by the play button and outputs the decompressed audio signal to the digital / analog converter; The central processing unit controls the voice signal compression unit to compress the digital voice signal in response to the compression rate input by the user by the compression rate adjustment button in the recording mode, and before compressing the compressed voice signal in the playback mode. And a digital audio signal recording / reproducing apparatus for a still camera, for controlling the decompression unit to reproduce the digital audio signal. The digital audio signal recording / reproducing apparatus according to any one of claims 1 to 10, A main body and a support; The main body is provided with the speaker for outputting the audio signal to be reproduced on the front side, the operation unit including the recording mode selection button, the playback button and the compression ratio adjustment button on the back, and the digital audio signal recording / playback apparatus A display unit for displaying the operation state of the and the voice signal input unit formed with a plurality of jacks for receiving the external voice is installed, the memory for storing the digital voice signal is built in the lower portion of the main body, the side A peripheral device interface unit connected to the peripheral device is installed in the peripheral device; The support portion is fastened to a coupling groove formed at a lower end of the still camera in a state in which the still camera is seated on an upper end thereof, and a fastening member for supporting and fixing the still camera is installed, and the still camera is fastened and fixed to the support portion. The built-in microphone is built in the shutter sound detection area so as to detect the shutter sound generated from the still camera when the camera is activated. A digital audio signal recording / reproducing apparatus for a still camera, which is built in a predetermined position. The method of claim 11, And a hand grip attached to the side of the main body to prevent separation of the digital audio signal recording / reproducing apparatus when a user attaches the digital audio signal recording / reproducing apparatus. .