KR20020003312A - Digital Recoder and Recording Method using the same - Google Patents

Abstract

PURPOSE: A digital recorder and a recording method of the recorder are provided to easily manage recording signals, to improve accuracy in recording and convenience of utilization of the recorder, and to keep security of recorded contents. CONSTITUTION: A digital recorder includes an interface(10) connected to a microphone and a speaker to amplify and filter audio signals, a CODEC(20) connected to the interface to perform digital-to-analog conversion for the audio signal, and the first storage means(30) for temporarily storing an input audio signal sampled into a digital signal through the CODEC. The recorder further has a key panel(50) having various operation buttons and a function key by which storage time of the input audio signal is designated before recording, the second storage means(41) for storing a recording signal according to key operation of the key panel, and a display(60) for visually displaying the operation state of the digital recorder. The digital recorder also has a program storage(80) for storing a driving program related with recording and reproduction operations of the recorder and recording operation of the input audio signal before recording, and a microprocessor(90) for controlling the recorder based on the driving program and for reading the input audio signal before recording and an audio signal that is inputted through the CODEC from the moment at which recording starts to the moment at which recording is finished from the first storage means to transmit the signals to the second storage means.

Description

Digital recorder and recording method {Digital Recoder and Recording Method using the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorder, and more particularly, to a digital recorder and a method for recording an audio signal before recording starts, encrypting and storing the audio signal when recording the audio signal, and easily managing the recorded data.

In general, the recorder refers to a device that converts an external input signal such as a user's voice signal into an electrical signal, records the magnetic signal, reads the magnetized signal recorded on the magnetic tape, and outputs the audible signal. Recently, due to the development of digital technology and computer devices, a digital recorder has been developed for sampling and storing an external input signal, which is an analog signal, as a digital signal, and converting and outputting the sampled digital signal to an analog signal. Doing.

However, in the case of a conventional analog / digital recorder, an operation of storing an external input signal such as a voice signal and outputting the same according to a user's operation is faithfully performed. If recording is required until the end of recording, data cannot be stored for several seconds immediately before recording (until the user decides whether to record, until the user presses the actual recording button or until the user presses the recording button and immediately before the actual recording operation is performed). There was a problem.

In addition, in the case of a conventional analog / digital recorder, when a storage medium (for example, a cassette tape or a MD (Mini Disk)) in which a recording signal is stored is stolen or lost, the recording contents are exposed to the thief / acquirer as it is. Depending on the importance of the content, the severity is significant.

Accordingly, the present invention has been made in view of the above circumstances, and provides a digital recorder and a method for easily managing a recording signal, improving recording accuracy and ease of use, and maintaining the security of recording contents. There is a purpose.

1 is a block diagram showing the internal configuration of a digital recorder according to the present invention.

2 is a diagram showing an information structure of recorded data according to the present invention;

3 is a flowchart for explaining a digital recorder and a recording method thereof according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: interface unit, 20: codec,

30: first memory portion, 40: drive drive,

41: second memory portion, 50: key panel portion,

51: unique number storage unit, 60: display unit,

70: encryption processing unit, 80: program storage unit,

90: microprocessor, M1: microphone,

S1: speaker.

The digital recorder according to the present invention for achieving the above object is an interface unit for amplifying and filtering an audio signal input and output connected to a microphone and a speaker, and a digital / analog signal for an input / output audio signal connected to the interface unit. A codec for performing conversion, first storage means for temporarily storing an input audio signal sampled as a digital signal through the codec, various operation buttons for user's recording operation, and a storage time designation of an input audio signal before recording starts Visually displaying the operation state of the key panel unit having a function key for the second key, the second storage means for storing the recording signal according to the key operation of the key panel unit, and the digital recorder according to the key operation of the key panel unit Recording and playback operations of the digital recorder and recording audio input signal prior to the start of recording. A program storage unit having a driving program associated with the work, and the overall control of the device based on the driving program of the program storage unit, and recording from the beginning of recording through the input audio signal and the codec before the start of recording for a predetermined time. And a microprocessor which controls the audio signal input until the end is read from the first storage means and transmitted and stored in the second storage means as a recording signal.

In addition, the present invention further comprises an encryption processing unit for converting the input audio signal transmitted via the codec into a predetermined bit encrypted code, wherein the microprocessor is configured to provide an input audio signal during recording operation through the key panel unit. And transmitting the data to the encryption processing unit to perform the encryption process and storing the data in the second storage means.

In addition, the digital recording method according to the present invention for achieving the above object comprises a first step of amplifying and filtering the input audio signal applied through the microphone, and a second step of sampling the amplified and filtered input audio signal into a digital signal; And a third step of temporarily storing the continuously input and sampled audio signal in the first storage means, and inputting the audio signal before the start of recording for a predetermined designated amount of time during the recording operation of the user and sampling and inputting from the start of recording to the end of recording. And a fourth step of reading the audio signal from the first storage means and transmitting and storing the audio signal to the second storage means.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing the internal configuration of a digital recorder according to the present invention.

In FIG. 1, reference numeral 10 denotes an interface unit for amplifying and filtering an audio signal input and output, which amplifies and filters an input audio signal applied through a microphone M1, and amplifies an output audio signal to a speaker S1. It is provided with an amplifying circuit and a filter circuit therein to apply. The microphone 10 may be provided inside the apparatus or connected through an external input terminal (eg, LINE IN terminal) (not shown).

In FIG. 1, reference numeral 20 denotes a codec connected between the interface unit 10 and a microprocessor, which will be described later, for sampling an input audio signal, which is an analog signal, into a digital signal, and converting the output audio signal, which is a digital signal, to an analog signal. 30 is a first memory unit for temporarily storing an audio signal sampled as a digital signal through the codec 20, and a microprocessor to be described later may convert the audio signal sampled through the codec 20 into the first memory unit. The memory unit 30 continuously stores the input audio signal by discarding the first stored audio signal when the storage capacity of the first memory unit 30 is exceeded.

In FIG. 1, reference numeral 40 denotes a drive drive provided with a corresponding drive to support a storage medium such as, for example, Compact Flash, Smart Media, Memory Stick, and the like. The drive is selectively provided according to the type of storage medium. In addition, reference numeral 41 denotes a second memory unit for storing audio signals transmitted from a microprocessor to be described later according to a recording operation of a user, which uses a large capacity memory card used for digital media such as compact flush, smart media, and memory stick. Done.

In the present exemplary embodiment, the drive drive 40 and the second memory unit 41 are distinguished and displayed due to the characteristics of the storage medium used, but it is also possible to use the storage means mounted in the device such as a hard disk or a flash memory. .

In FIG. 1, reference numeral 50 designates various operation buttons related to a recording operation and a storage time of an input audio signal before recording starts, and a predetermined recording number and a unique number assigned to an audio signal to be recorded (hereinafter referred to as a 'recording signal'). The key panel unit is provided with various function keys associated with. The recording number represents an identification number assigned to each recording signal during the recording operation of the user, and the unique number represents an identification number assigned to each user. Reference numeral 51 is a unique number storage unit for storing the unique number assigned to each user to identify the recorder, which may be selectively provided depending on whether the unique number is assigned. Reference numeral 60 denotes a display unit for visually displaying the operation state of the digital recorder according to the user's key operation.

In FIG. 1, reference numeral 70 denotes an encryption processing unit for converting an input audio signal transmitted through the codec 20 into an encrypted code of a predetermined bit, which may be selectively provided depending on whether or not the recording contents are secured. Do. Reference numeral 80 denotes a program storage unit provided with driving programs related to the recording and reproducing operations of the digital recorder as well as the recording operation of the input audio signal before recording starts.

And the following Table 1 briefly shows the various recording and playback functions provided through the digital recorder, the program storage unit 80 is provided with a predetermined drive program to support the functions of the following Table 1.

(Less than 100)

Function item detail of fuction Recording number assignment function It records the input audio signal by the user specified recording number, saves multiple recording signals with different recording numbers in the same storage medium, and supports moving to the selected recording number during playback. Unique number assignment function Record by adding the unique number which is the recorder's identification number to the input audio signal, and if the unique number contains the time information, the recorder's unique number, recording date, and recording time are displayed during playback. Sampling rate designation function Allows the user to record at a sampling rate of 4 to 44.1 Ksps Playback Speed Control Allows you to adjust the playback speed from 1 to 24 times normal playback speed Section repeat playback function Repeated playback from a certain time before the start of the playback start time to the end of the playback (specified by the user), and the repeat playback speed can be set at 0.3 ~ 1.5 times the normal playback speed. Channel selection function Allows the user to select channels for recording and playback (channel 1, channel 2, stereo channels)

In FIG. 1, reference numeral 90 denotes a predetermined amount of time (for example, 0 to 10 seconds) specified by the key panel unit 50 at the start of recording and controlling the entire apparatus based on the operation program of the program storage unit 80. Range from the first memory unit 30 to the second memory unit 41 by reading the input audio signal before the start of recording and the audio signal input from the start of recording until the end of recording. It is a microprocessor that controls transmission and storage.

That is, the microprocessor 90 receives the audio signal input through the microphone M1 and the interface unit 10 even before the recording button (not shown) of the key panel unit 50 is pressed. Through sampling to a digital signal through the first memory unit 30 is continuously stored, it is controlled to use it as an input audio signal before recording starts.

In addition, when the digital recorder is provided with the encryption processing unit 70 shown in FIG. 1, the microprocessor 90 stores the recording signal before storing the recording signal in the second memory unit 41. ) Is converted into an encrypted code of a predetermined bit and controlled to be stored.

In addition, the microprocessor 90 adds the recording number and the unique number to the recording signal stored in the second memory unit 41 when the recording number and the unique number are designated through the key panel unit 50. In addition to controlling the storage. In addition, it will be desirable to add the time information of the recording to the unique number so as to confirm the recorder and the recording date and time. 2 shows an information structure of data stored in the second memory unit 41, which includes the recording number A1, the unique number A2, the time information A3, and the recording signal A4. It is configured by. The recording number A1, the unique number A2, and the time information A3 are examples of additional information of the recording signal A4, and various additional information can be additionally set and assigned.

Hereinafter, an operation of a digital recorder and a recording method thereof according to the present invention will be described with reference to FIG. 3.

First, when the power of the device is turned on, the microprocessor 90 of FIG. 1 prepares for the recording of the external input audio signal and the reproducing operation of the recording signal A4 according to the operation program of the program storage unit 80. Initial drive starts (ST301 step)

When the initial driving of the device is completed, the external input audio signal applied through the microphone M1 of FIG. 1 is amplified to a predetermined level through the interface unit 10 and filtered to a predetermined frequency band to the codec 20 of FIG. 1. Is approved. In this case, the codec 20 of FIG. 1 samples the applied input audio signal into digital data, and the microprocessor 90 controls the sampling operation to be performed at a rate of 4 to 44.1 Ksps, for example, according to a user's key operation. .

The microprocessor 90 of FIG. 1 continuously stores the input audio signal sampled at a predetermined rate through the codec 20 in the first memory unit 30. In this case, the memory capacity of the first memory unit 30 is limited. When the storage capacity of the first memory unit 30 is exceeded, the external input audio signal sampled by discarding the data of the previously stored stack is discarded. The first memory unit 30 operates as a buffer (step ST302).

After that, the user who wants to record the memory card, that is, the second memory unit 41 is inserted into the driving drive 40 of FIG. 1. In this case, when there is no memory card inserted in the drive drive 40 or when the memory card is not properly inserted, the microprocessor 90 displays a predetermined error message on the display unit 60 (steps ST303 to ST305).

On the other hand, after the memory card, that is, the second memory unit 41 is properly inserted, the user operates the key panel unit 50 to record the recording number A1 and the unique number (a1) assigned to the recording signal A4 of FIG. A2) is designated, and the date information A3 of FIG. 2 is designated using an internal clock of the digital recorder, although not shown. (ST306) In addition, the user operates the key panel unit 50 of FIG. In this case, the recording time of the input audio signal can be specified before recording starts. For example, it is possible to specify the recording time of the input audio signal in 1 second units within the range of 0 to 10 seconds.

Thereafter, although not shown in FIG. 3A, the user operates the key panel unit 50 to re-specify the sampling rate or set other recording conditions such as specifying a recording channel. Press the record button (not shown) provided (step ST308)

Accordingly, the microprocessor 90 of FIG. 1 continuously reads the input audio signal before the start of recording from the first memory unit 30 and the sampled input audio signal from the start of recording until the end of recording. The encryption processing unit 70 transmits to the encryption processing unit 70 (step ST309), and the encryption processing unit 70 converts the transmitted input audio signal into an encrypted code of a predetermined bit (step ST310).

In addition, the microprocessor 90 of FIG. 1 stores the input audio signal converted into an encrypted code in the second memory unit 41 as the recording signal A4 of FIG. 2, and the recording number assigned to the recording signal A4. By assigning (A1), a unique number (A2) and time information (A3), the recording operation of the input audio signal is completed. (ST311)

Thereafter, the user who wants to reproduce the recording contents inserts the second memory unit 41 into the drive drive 40 of FIG. 1, and operates the key panel unit 50 to record the recording number assigned to the corresponding recording signal A4. Select / enter A1). Accordingly, the microprocessor 90 of FIG. 1 reads the recording signal A4 corresponding to the selected / input recording number A1 and reads whether the encryption signal is encrypted. In this case, it is also possible to assign a predetermined identification code for determining whether the encrypted recording signal A4 is encrypted and to determine whether the recording signal A4 is encrypted.

Therefore, when it is determined that the recording signal A4 is encrypted, the microprocessor 90 of FIG. 1 transmits the read recording signal A4 to the encryption processing unit 70 of FIG. 1, and the encryption processing unit 70 decrypts it. Done. In addition, the microprocessor 90 transmits the decoded recording signal A4 to the codec 20 and converts the converted audio signal into an analog signal. The output audio signal converted into the analog signal is amplified through the interface unit 10 and the speaker ( Output to S1). Meanwhile, when the recording signal A4 is not an encrypted signal, it is output through the codec 20, the interface unit 10, and the speaker S1 without undergoing a decryption process.

Therefore, according to the embodiment described above, when recording the input audio signal, the audio signal before the start of recording is also recorded, so that a precise recording operation can be easily performed. In addition, the recording signal is encrypted and stored, so that when the recording medium such as a recording tape is stolen or lost, the contents of the recording can be prevented from leaking to the outside. In addition, the recording signal can be easily managed by assigning a recording number for distinguishing the recording contents, a unique number for distinguishing the recorders, and time information indicating the recording date and time.

As described above, according to the present invention, when recording an audio signal, the signal before recording is also recorded, thereby ensuring the accuracy of the recording, and assigning an identification code to the recording, as well as encrypting and storing the recording. Management and security can be facilitated.

Claims (6)

Interface unit for amplifying and filtering the audio signal input and output connected to the microphone and speaker, A codec connected to the interface unit to perform digital / analog signal conversion on input / output audio signals; First storage means for temporarily storing an input audio signal sampled as a digital signal through the codec; A key panel unit having various operation buttons for recording operation of a user and function keys for designating a storage time of an input audio signal before recording starts; Second storage means for storing a recording signal according to a key operation of the key panel unit; A display unit for visually displaying an operation state of the digital recorder according to key operation of the key panel unit; A program storage unit provided with a driving program related to recording and reproducing operations of a digital recorder and recording operation of an input audio signal before recording starts; On the basis of the driving program of the program storage unit, and controlling the entire device, and inputs the audio signal before the start of recording for a predetermined time and the audio signal input from the start of recording to the end of recording through the codec from the first storage means. And a microprocessor which reads and transmits and stores the recording signal to the second storage means as a recording signal. The method of claim 1, And an encryption processing unit for converting the input audio signal transmitted through the codec into a predetermined bit encrypted code. And the microprocessor controls an input audio signal to be transmitted to the encryption processing unit during the recording operation through the key panel unit to perform an encryption process and to store the input audio signal in the second storage unit. The method of claim 1, Further comprising a unique number storage for storing at least one unique number assigned to each user to identify the recorder, The recording signal stored in the second storage means is provided with a recording number, a unique number, time information for confirming the recording date and time for identifying the recording contents, The recording number and the unique number is a digital recorder, characterized in that the user designates through the key panel. The method of claim 3, wherein And the microprocessor controls to display at least one of the recording number, the unique number, and the time information on the display unit when reproducing the recording signal stored in the second storage means. The method of claim 1, The second storage means is an external memory card for storing the recording signal, And a drive drive for driving the external memory card. A first step of amplifying and filtering an input audio signal applied through a microphone, Sampling the amplified and filtered input audio signal into a digital signal; A third step of temporarily storing the continuously input and sampled audio signal in the first storage means, A fourth input audio signal which is input from the first storage means to be read and input from the first storage means to the second storage means after inputting the input audio signal and the audio signal sampled from the start of recording until the end of recording. Digital recording method characterized in that it comprises a step.