JP2009032335A - Recording/reproducing device of audio data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an audio data recording/reproducing device capable of recording a signal regarding an entered audio in a recording medium, and surely reading a reading-desired data portion from all the recorded data, and simple in configuration. <P>SOLUTION: High-speed Fourier transform processing is carried out for all data recorded in a recording medium A19 by a FFT processing part 25; frequency components and amplitude levels of the data are obtained to be recorded in a storage part 26; a signal of an audio corresponding to reading-desired data is entered from a code input part 6, and by collating frequency components and amplitude levels of partial data obtained by carrying out high-speed Fourier transform processing via the FFT processing part 25 with the stored processing result, the reading-desired data portion is specified. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention, for example, picks up a voice input from a microphone and converts it into an analog voice signal. The A / D converter converts the analog voice signal into a digital signal, and the digital signal is recorded as data. Or recording and playback of audio data in such a manner that the audio is recorded as digital data on a recording medium and then the recorded digital data is reproduced and output as an analog audio signal. Relates to the device.
In particular, the present invention relates to an improvement of reading and reproducing a desired data portion from data recorded on a recording medium, copying to another recording medium, and editing using the desired data portion.

  Today, the audio data recording / reproducing apparatus having such a configuration is multi-functional, and the present invention relates to a data editing function for performing editing using all or part of data recorded on a recording medium, and a recording medium. Recording of audio data comprising a data copy function for copying all or part of the data recorded on the recording medium to another recording medium, and a function for recording and outputting corresponding video in a timely manner A playback device is also included.

In recent years, a hard disk as a recording medium having a large capacity has been provided, and all audio received from broadcast media and video signals corresponding thereto are automatically recorded as data on the recording medium in association with each other. Among them, only the data desired by the user is re-recorded on a relatively inexpensive recording medium such as a DVD recording medium, so that the desired data can be subdivided from the entire data. There has been known an audio data recording / reproducing apparatus configured to select, retrieve and store as described above, and as a result, to enable simple reproduction of a data portion desired by a user.
An audio data recording / reproducing apparatus equipped with a recording medium with a large capacity does not have a large restriction on the amount of data that can be recorded. It is possible to record all or all of the audio signals received by long-time broadcasting, and in some cases, continue recording data related to broadcasting for one week or more.

When recording audio data or the like continuously as described above, it is not necessary to repeat the ON / OFF operation of the recording switch in small increments, and the recording is ON including a wasteful data recording portion. You can leave it on.
The operation of recording audio data having such a configuration substantially has a function for preventing the user from forgetting to turn on the recording switch and making a recording error when recording audio data or the like. As a result, it is effective and convenient.

On the other hand, in the recording / playback apparatus for audio data having a large recording capacity, the possibility that the total amount of recorded data increases as the recordable capacity of the data increases, and the total amount of recorded data increases. The more the user becomes, the more complicated the search for the data desired to be reproduced, the search for the target data portion desired to be re-recorded, and the more time is required. .
In particular, the problem becomes very serious when the entire data is too large and data to be reproduced or re-recorded is found within a predetermined time.
In order to solve such a problem, the invention disclosed in the following document is known.

JP 2001-326889 A

The invention disclosed in Patent Document 1 adds address information data to data to be reproduced for the purpose of easily searching and reproducing a desired data portion from a recording medium and reproducing the desired reproduction object. There is shown a recording / reproducing apparatus and a retrieval system for retrieving a data portion based on the additional address information data.
In the invention having such a configuration, it is premised that address information data is added to data to be reproduced, or address information can be added to data to be reproduced.

Therefore, when the address information data is not added to the data to be reproduced, or when the address information cannot be easily added to the data to be reproduced, the address information data is further added to the data to be reproduced. However, in the case where the reproducing apparatus is not provided with a means for reading the address information data, it is impossible to find the desired data portion to be reproduced (the position of the desired data with respect to the entire data) as a result. There is a problem that a desired data portion cannot be easily reproduced.
In addition, if a means for adding address information data to data to be recorded and a means for reading the added address information data are provided, there is a problem that the construction of the apparatus itself becomes large.

Similarly, as data similar to the above address information data, the time information data indicating the position of the data in absolute time or relative time with respect to the entire data, and the volume level of the audio signal in the received data. Examples include level information data indicating the position of the data.
However, in order to utilize data similar to these address information data, of course, it is necessary to provide means for adding data to be utilized to data to be reproduced and means for reading (searching). It is assumed that the desired data can be retrieved from the above data, and has the same problem as the invention disclosed in Patent Document 1.

  The present invention has been made in view of the above circumstances, and it is possible to record audio data on a recording medium having a large storage capacity and to easily find desired data from the recorded audio data. In addition, even if information data for indicating the data position is added to the data to be recorded (data to be reproduced) or no means for reading the information data is provided, the desired data is found ( As a result, the present invention provides an audio data recording / reproducing apparatus capable of reproducing the desired data and copying the desired data to an arbitrary recording medium.

The present invention performs fast Fourier transform processing on the entire area of data to be recorded, specifies the frequency component and amplitude level of the data, and obtains the result of the fast Fourier transform processing related to the data portion desired to be read out as the frequency component of the data. And the amplitude level, the audio data recording / reproducing apparatus is configured to specify the position of the data portion desired to be read with respect to the entire data.
The detailed configuration is such that digital data related to sound is recorded on a recording medium, a desired data portion is specified from all the data recorded on the recording medium, read, reproduced, copied, and edited. An audio data recording / reproducing apparatus for performing
A fast Fourier transform process is performed to extract which frequency components are included in the digital data related to the sound to be recorded, and at what amplitude level, and the processing result is recorded as search target data and desired to be read out. Similarly, at least a part of the data is similarly subjected to fast Fourier transform processing to create target data, and the target data is collated with the search target data to retrieve data desired to be read. Recording / reproducing apparatus.

As a specific method for specifying and reading out a desired data portion from the entire area of the digital data recorded on the recording medium, an audio signal or audio data corresponding to the desired data portion is read out as an instrument. Sound obtained by performing the above, a signal related to the sound, or digital data.
Moreover, examples of the musical instrument include guitars, electronic organs, pianos, violins, etc., and a method of inputting the voice of the musical instrument related to the data desired to be read by the microphone, or data including the voice of those musical instruments from the entire data. When there is a possibility of reading, there is a method of recording the sound of the musical instrument in a memory chip or the like in advance and outputting a signal or data relating to the sound from the memory chip when desired.

Now, the principle of the main part of the present invention will be described. Unless the sound is output continuously or a plurality of different sounds are output continuously, the frequency of the sound that is emitted changes with time. In many cases, audio can be recorded when a plurality of different sounds (a plurality of sounds having different frequencies) are output simultaneously.
By the way, when a series of single notes, a series of different single notes, etc. are recorded, the audio desired to be reproduced is the same at any recording time, so the desired audio can be read regardless of which part of the data is read. Can get no problem. Further, if the read voice is continuously repeated for a desired period during the reproduction period, the desired voice can be output only for the desired period.

On the other hand, when the audio to be recorded is a plurality of different audios, and when a plurality of audios are picked up at the same time, i.e., overlapped in time, each of the audios constituting the audio is regarded as an analog amount. As a result, the frequency of the signal constituting the sound of the recording target recorded as a composite signal of a plurality of different sounds is formed. Only when the components are specified or the frequency components are greatly different from each other, each sound signal is separated by passing through a filter, or only a specific sound signal is emphasized (attenuated) and extracted. Means for doing this are known.
However, the means of such a configuration is not effective for specifying the position of data desired to be read out from the entire data that the present invention seeks.

On the other hand, when fast Fourier transform processing is performed on a plurality of different sounds to be recorded, even if the sounds are synthesized by overlapping each other, The frequency of each voice included in the is separated and the content is revealed.
Therefore, the result of the frequency component is known by the fast Fourier transform process over the entire area of the audio data to be recorded, and the frequency component of the data related to the sound to be read is known by the fast Fourier transform process. For example, it is possible to specify the data portion desired to be read by determining the consistency by checking these frequency components and searching for the reading position based on the check result.

Furthermore, the input audio signal includes conditions such as the interval between the generated sounds constituting the audio signal, that is, the so-called rhythm in the performance of the musical instrument. In the present invention, for each audio interval of the input audio signal, Therefore, it is possible to obtain a more accurate collation determination by collating not only the components constituting the audio signal but also the intervals of the generated speech. The function for performing the above-described search is provided, and the search for the position desired to be read by determination collation is made faster and more reliable as a result of such a function.
In other words, for example, in the United States, it is known that an investigator uses a recording device, that is, a recording / reproducing device for audio data, when taking a record with a criminal. In the record taking that is performed, audio data as long as several hundred hours may be recorded.

When recording audio data with such a long recording time, if the data is recorded in chronological order, the data can be easily organized at a later date. It is advisable to describe the start date and time and record the sound as data.
In recording of audio data performed in this way, when reproducing data desired to be read out at a later date, the date and time of the data desired to be read out are input by voice, and fast Fourier transform processing is performed on the audio at that date and time. By performing the check and comparing the processing result with the result of the fast Fourier transform processing of the entire data, it becomes possible to easily search and find the data desired to be read.

However, when the storage capacity of the recording medium on which the read data is recorded is sufficiently large, for example, 60 gigabytes (GB), the data portion having the same frequency component as the frequency component related to the data that is truly desired to be read There are cases where there are multiple.
In particular, when the recorded audio data relates to the sound of a musical instrument in Western music, the output of the audio is performed such that the level of the audio, the length of the audio, etc. take discrete values, so the tempo differs greatly. Aside from the case, in the frequency component matching by the fast Fourier transform process, there is a very large number of data parts that are exactly the same as the data that is really desired to be read out and the data that is completely different from the requested data. In some cases, the search range can be narrowed to the extent that the matching parts match, but there is a problem that it cannot be said that the search means is very effective.

On the other hand, by making the collation voice data for searching the data desired to be read longer time data, it is possible to improve the search accuracy and make it easy to find the data that is truly desired to be read. Can be considered.
In such a method, if the length of the voice data for collation is longer, the search range is further narrowed, and it is easier to find the data that is truly required.
However, if collation voice data having a long time is prepared, in some cases, for example, data that would be desired to be read out is recorded on another recording medium from the beginning. Can be a reliable way to search.

Therefore, the inventor of the present invention adds a requirement indicating characteristics to the data portion desired to be read so that the result of narrowing down the search is further limited. Was completed.
In other words, for example, when the audio data is related to music, the candidate options for the desired data are limited to a narrower range by specifying a part of the desired data to be read and specifying the instrument related to the desired data. is there.

Specifically, if the musical instrument used for audio output with the desired data is the violin, guitar, piano, electric organ, etc. with respect to the desired data from the entire music data, the instrument is identified and the specific data Later, play one measure or less.
Here, in the entire data to be collated, the musical instrument to be used is specified, and the location of the data that is desired to be read out by the performance is very narrowly limited, and the frequency component is extremely low by the fast Fourier transform processing. Since the collation can be accurately performed, it is possible to obtain data that is truly desired to be read.

  The present invention provides high-speed recording over the entire area to be recorded when digital data such as a signal picked up by a microphone, a signal related to a sound received by a radio receiver, or a digital data related to a sound obtained by copying is recorded as digital data. The frequency component and the amplitude level of the digital data are extracted by Fourier transform processing and the extraction result of the whole area data is recorded, and when the data is partially read out from the digital data, the reading is desired. By configuring the data to be searched for desired data by extracting the frequency component and amplitude level of the data by fast Fourier transform processing and collating the extraction result of the desired data with the extraction result of the whole area data, Data indicating the position of the data of each part is recorded in the entire recorded data In addition, it is possible to easily obtain the position of the data desired to be read by providing a part of the data desired to be read, and the position of each partial data is recorded when the data is recorded. The desired data to be read can be reliably read by the configuration, and since the calculation for that is performed by the fast Fourier transform processing, the voice can be easily and quickly performed without increasing the configuration of the apparatus. A data recording / reproducing apparatus.

  When the audio data to be recorded is related to musical instrument performance or a human voice, the instrument or human voice is captured as extremely characteristic data in the fast Fourier transform processing in the present invention, so that it is desired to read out the data. The retrieval of the data of the portion to be performed can be performed more easily and speedily.

The present invention will be described based on the best mode shown below. However, the present invention is not limited to this embodiment.
FIG. 1 is a perspective view showing the external appearance of an audio data recording / reproducing apparatus 1, and FIG. 2 explains the configuration of the audio data recording / reproducing apparatus 1 in a state where recording media A and B are connected. It is a block diagram.

The audio data recording / reproducing apparatus 1 includes an input terminal 3, a right microphone 4, a left microphone 5, a code input unit 6, and an A / D converter disposed on or inside a casing 2 that is a main body of the apparatus. 7, clock 8, digital signal processor 9 (hereinafter referred to as “DSP 9”), recording / reproducing units 10 and 11, CPU 12, memory 13, operating unit 14, display unit 15, D / An A converter 16, an output terminal 17, and a speaker 18 are provided.
As described, in the figure showing the configuration of the audio data recording / reproducing apparatus 1, the recording medium A19 and the recording medium B20 are connected to the recording / reproducing units 10 and 11, respectively.

The recording medium A19 is specifically a hard disk and its storage capacity is relatively large, for example 60 GB, and the recording medium B20 is specifically a CD-R and its storage capacity. Is a relatively small capacity of, for example, 64 megabytes (MB).
A concave portion (not shown) is provided in the front portion of the casing 2 of the audio data recording / reproducing apparatus 1, and connectors (not shown) of the recording / reproducing portions 10 and 11 are provided in the concave portion, and a recording medium A19 is provided in these connectors. When the recording medium B20 is connected to each other, the recording medium A19 and the recording medium B20 are configured to take a position accommodated in the recess.

Reference numeral 21 denotes a lid, which is rotatable in the direction of arrow C with respect to the main body of the casing 2 and closes the recess.
The front part and the top surface of the casing 2 constitute a part of the operation part 13 and are provided with operation switches for the user to operate.

A liquid crystal display panel 22 of the display unit 14, a microphone grille 23 for the right microphone 4 and the left microphone 5, and a speaker grille 24 for the speaker 18 are disposed on the top surface of the casing 2.
Further, an input terminal 3 and a cord input unit 6 are disposed on the right side of the casing 2.

In the following, the function of each unit shown in FIG. 2 will be described.
The input terminal 3 is used to input an external audio signal from an external microphone, tuner, musical instrument microphone, or the like (not shown).
Both the right microphone 4 and the left microphone 5 are arranged so that the sound collection surface is in an upward direction from the top surface of the casing 2, and when the sound to be recorded is picked up, it is converted into an electric signal and further amplified to a predetermined level. This is sent to the A / D converter 7 later.

The code input unit 6 inputs analog sound (code) that is the same as or very close to the data that is desired to be read out, amplifies it to a predetermined level, and sends it to the A / D converter 7.
Specifically, the chord input to the chord input unit 6 is a voice signal of a person picked up by a microphone, a chord related to a voice from an electric guitar, an electronic organ, etc., or an instrument sound such as a piano or a violin. For example, a signal related to a sound obtained by picking up can be used.

The A / D converter 7 converts an input analog signal into digital data and sends it to the DSP 9.
The clock 8 has a function as an operation clock of the recording / reproduction control unit 27 and is used to set the date and time as a time measuring function. The data input to the recording / reproduction control unit 27 is attached with time data. And recorded on the recording medium A19.

When the DSP 9 receives the digital data related to the sound from the A / D converter 7, the DSP 9 performs a fast Fourier transform process for extracting which frequency component is included in the digital data related to the sound at what amplitude level. The processing result is recorded as search target data.
Further, when the DSP 9 receives the data related to the voice input from the code input unit 6 via the A / D converter 7, that is, the digital data obtained by converting the code, the digital data is similar to the above. Perform a fast Fourier transform process, and search for the data to be obtained by collating the same or very similar digital data from the search target data and the data obtained as a result of this process, and search the data A function is provided to find and call the corresponding location.

The DSP 9 includes an FFT processing unit 25, a storage unit 26, a recording / playback control unit 27, a storage unit 28, and an audio coding processing unit 29.
When the digital data is input from the A / D converter 7, the FFT processing unit 25 performs a fast Fourier transform process to extract which frequency components are included in each part of the continuous digital data at what amplitude level. To do.

The storage unit 26 is connected to the subsequent stage of the FFT processing unit 25 and stores the extraction result of the fast Fourier transform processing in the FFT processing unit 25.
The recording / playback control unit 27 receives digital data related to audio from the A / D converter 7 and the recording / playback unit 10 records the digital data from the A / D converter 7 on the recording medium A19. And control of reproducing digital data recorded on the recording medium A19.

Further, the recording / reproducing control unit 27 is characteristic among frequency components related to digital data to be recorded from the storage unit 26 storing data obtained by the fast Fourier transform process (extraction process) of the FFT processing unit 25. Control for reading out the extraction processing data indicating the component and recording the recording medium A19 in association with the recording time via the recording / reproducing unit 10, and the data relating to the frequency component recorded on the recording medium A19 and the arrangement thereof The control for reading out is performed.
Further, when a search request is made for the position of the arrangement of the digital data portion desired to be read out from the digital data recorded on the recording medium A19, the recording / reproducing control unit 27 causes the recording / reproducing unit 10 to The data relating to the frequency component obtained by the FFT processing unit 25 recorded on the recording medium A19 is read out, and a reference comparison is performed based on the read data and the arrangement of data corresponding to the position of the desired data. When the position of the digital data portion that the user wants to read is accurately searched in a short time, and the position of the desired digital data portion is determined by the search, the position of the digital data portion is searched as the playback start position (the playback position Control is performed to perform (movement).

In addition, the recording / reproducing control unit 27 controls the recording / reproducing unit 11 to record the digital data related to the sound from the A / D converter 7 on the recording medium B20, and the recording / reproducing unit 11 from the recording / reproducing unit 10. For recording the reproduced digital data related to the sound on the recording medium B20 and the control for the recording / reproducing unit 11 to reproduce the digital data related to the sound from the recording medium B20.
The recording / reproducing control unit 27 further matches the above-described input code from the data recorded on the recording medium A19 based on the extraction result by the FFT processing unit 25 stored in the storage unit 26. The arrangement is collated and read, and the read target digital data is recorded as it is on the recording medium B20, that is, the editing function is controlled.

When the data related to the sound from the A / D conversion unit 7 is subjected to FFT processing in the FFT processing unit 25 and a characteristic frequency component of the data is derived, the speech coding processing unit 29 operates the operation unit 14 with respect to the frequency component. Is converted into a musical instrument code that matches the timbre of the specific musical instrument that has been set by the operation, and stored in the storage unit 28 in association with the input audio signal.
The storage unit 28 stores the chord of the musical instrument. Further, the storage unit 28 indicates the type of audio signal for reading input from the code input means 6, such as an electric guitar, an electronic organ, a piano, and a violin. Is input, the type of the audio signal is stored.

The operation unit 14 receives an operation from the user and sends a message to that effect to the CPU 12 as a control signal. When the operation unit 14 inputs an audio signal for search from the chord input unit 6, if the audio signal is an audio signal related to a specific instrument, for example, an audio signal of an electric guitar, an audio of an electric organ In the case of a signal or the like, a signal for notifying the DSP 9 of the fact is also output.
The CPU 12 is located between the operation unit 14 and the DSP 9 and converts the operation content from the user into a predetermined control signal and outputs it.

The memory 13 records data for assisting the function of the CPU 12.
The display unit 15 is a diagram showing the current state of the apparatus, the content of the operation input to the operation unit 14, the recording and playback time, the recording level, and the frequency related to the processing in the FFT processing unit 25, and the input from the code input unit 6. The instrument code of the signal to be transmitted, the current time, etc. are displayed.

The D / A converter 16 is substantially connected to the subsequent stage of the recording / reproducing units 10 and 11, and receives digital data related to reproduced audio from the recording medium A19 and the recording medium B20 and converts it into an analog signal. The output level is processed to a predetermined level and then output.
The output terminal 17 is connected to the subsequent stage of the D / A converter 16 and outputs an analog signal related to sound to an external speaker or the like.

The speaker 18 is connected to the subsequent stage of the D / A converter 16, receives an analog signal related to sound, converts it into sound, and outputs it.
The audio data recording / reproducing apparatus 1 is configured as described above. In the following, the search for the desired data portion will be described.

In the audio data recording / reproducing apparatus 1, the output terminal of a radio receiver (not shown) is connected to the input terminal 3 in advance. This radio receiver is provided with a monitor speaker so that the monitor sound can be heard.
In addition, a certain amount of digital data relating to the sound from the radio receiver has already been recorded on the recording medium A19, and when the certain amount of digital data is recorded on the recording medium A19, the data is processed by the FFT processor 25. The frequency components included in the entire area are extracted by the fast Fourier transform process and the amplitude level is included, and the result obtained by the extraction is recorded in the recording unit 26 as search data. .

First, the user operates the operation unit 14 to turn on the main power supply of the audio data recording / reproducing apparatus 1 to the output state, and then records the audio signal from the radio receiver on the recording medium A19. The operation unit 14 is operated as described above.
Here, the audio signal from the radio receiver is sent to the A / D converter 7 via the input terminal 3, converted from an analog signal to digital data, and sent to the DSP 9.

When digital data related to the radio receiver is input to the DSP 9, it is sent to the FFT processing unit 25 and the recording / reproducing control unit 27.
When receiving the digital data, the FFT processing unit 25 extracts which frequency component is included in each data portion at what amplitude level by fast Fourier transform processing over the entire area of the received digital data. The extraction result is sent to the storage unit 26 so as to be stored as search data.

The FFT processing unit 25 divides the input digital data into several groups and performs arithmetic processing. When the number of groupings is set to N by devising the calculation order at that time, the FFT processing unit 25 The number of times is proportional to NlogN.
On the other hand, in normal conversion, the number of operations is proportional to 2 to the Nth power.
Therefore, the number of operations is much smaller when the fast Fourier transform process is performed. In particular, the number of operations can be reduced as the number N of grouping is increased, and the processing time can be shortened accordingly. Thus, the configuration of the calculation means can be simplified.

On the other hand, the digital data sent to the recording / reproducing control unit 27 is associated with the clock signal from the clock 8 and is sequentially recorded on the recording medium A19 by the recording / reproducing unit 10.
In this way, when the audio signal from the radio receiver is recorded as digital data on the recording medium A19, the radio broadcast indicates that the next broadcast song is “Spring Sea” which is a favorite song of the user. I heard it from the monitor speaker of the receiver.

Therefore, since the user is good at playing the violin and has the violin at hand, the user performs an operation for turning on the functions of the right microphone 4 and the left microphone 5 from the operation unit 14, and further from the chord input unit 6. An operation was performed to indicate that the input voice is a violin.
Here, the right microphone 4 and the left microphone 5 are enabled, and the operation unit 14 sends to the CPU 12 that a violin audio signal is input to the code input unit 6.

The operator, who is a user, played the music “Haru no Umi” along with the music from the monitor speaker so as to be collected by the right microphone 4 and the left microphone 5.
When the user finished playing the song “Haru no Umi”, the functions of the right microphone 4 and the left microphone 5 were turned off and recording of the audio signal from the radio receiver was continued.

As described above, since the recording capacity of the recording medium A19 is sufficiently large as 60 GB, the user further records the data related to the desired sound by causing the sound data recording / reproducing apparatus 1 to function. By recording the audio data using the audio data recording / reproducing apparatus 1, it is not possible to know where the digital data related to the song “Spring Sea” was recorded on the recording medium A19.
The user once said that he wanted to hear the song “Spring Sea” from his friend, so he stated that it was recorded as data on the recording medium A19, even if his violin performance was included. It was.

The friend said that the performance of Koto and Violin was actually something that he wanted to listen to even more, so I want him to listen to it.
Therefore, when the user operates the operation unit 14 and operates the operation unit 14 to set the search audio signal from the code input unit 6 to be related to the voice of the violin, the fact is stored in the storage unit 26. Remembered.

Here, the user operates the audio data recording / reproducing apparatus 1, attaches a microphone to the violin at hand, connects the output terminal (not shown) of the microphone to the cord input unit 6, The code for searching for the sea (data for retrieval and reading) was played on the violin.
The analog audio signal of the cueing code is sent to the FFT processing unit 25 as digital data by the A / D conversion unit 7.

The FFT processing unit 25 performs fast Fourier transform processing on the digital data related to the cueing code, extracts the amplitude level in which the frequency component is included in the data, and records the extraction result on the recording / playback control unit 27.
Here, the recording / playback control unit 27 performs primary processing based on the fact that the voice stored in the storage unit 28 is a violin with respect to the result of the fast Fourier transform processing related to the entire data stored in the storage unit 26. Multiply the data on the violin voice. Therefore, at this time, among the digital data related to the voice recorded in the recording medium A19, only the digital data related to the voice is left as a search target.

Next, the recording / playback control unit 27 obtains the result of the fast Fourier transform process related to the search / read cue code stored in the storage unit 26 for the digital data remaining as the search target obtained above. The digital data related to the cue portion of the song “Haru no Umi” is searched.
Here, both the result of the fast Fourier transform process related to the digital data remaining in the first-order fluid and the result of the fast Fourier transform process related to the digital data of the cue portion are characteristic frequency components in time series. Therefore, the part where the cluster of the arrangement of the frequency components completely coincides with each other is extremely limited.

The recording / playback control unit 27 searches and specifies the corresponding part (the data of the head of the tune “Spring Sea”) in the whole data in which the above-mentioned frequency component array clusters completely match each other as the secondary fluid. Then, the corresponding part is stored in the storage unit 26, and that effect is displayed on the display unit 15 via the CPU 12.
Here, if there are three locations in the whole digital data that are completely coincident with the cluster of frequency components related to the cue portion data of the tune “Spring Sea” by the second screen, the three locations Each position on the whole data is stored in the storage unit 26, and the display unit 15 displays that there are three corresponding portions.

Based on the content displayed on the display unit 15, the user operates the operation unit 14 so as to reproduce each of the found three cueing parts.
Here, in the DSP, the recording / playback unit 10 stores the corresponding digital data from among the digital data of the recording medium A19 for the three cueing parts stored in the storage unit 26 and found in the second screen. The recording / playback control unit 27 performs control so that playback is performed every 5 seconds.

Here, the three digital data reproduced from the recording medium A19 are output as audio from the speaker 18 via the D / A converter 16.
The user listens to the sound related to the three digital data from the speaker 18 and specifies the number of the data desired to be read, that is, the head portion of the song “Spring Sea”.

Next, when the user finds the head portion of the desired song “Spring Sea” from the digital data recorded on the recording medium A19, the user operates the operation unit 14 to record it on the recording medium A19. The recording / reproducing control unit 27 is caused to function so as to copy the sound data of the song “Haru no Umi” to the recording medium B20.
Here, the recording / reproducing control unit 27 controls the recording / reproducing unit 10 to reproduce and read out the audio data of the tune “Spring Sea” and to record the data on the recording medium B20. Control.

When copying this data, the user operates the operation unit 14 to output the monitor sound from the speaker 18, so that the user and the friend have recorded the digital data of the song “Spring Sea” on the recording medium B 20. Know that.
Note that the tempo of the sound output of the song “Spring Sea” from the speaker 18 at this time is the same as that received by the radio receiver by the action of the shock proof memory (not shown). The recording of the digital data “Sea” on the recording medium B20 is performed in a time according to the processing capability of the recording / reproducing unit 11.
The monitor sound “Haru no Umi” can also be heard from the output terminal 17 through an external speaker.

In the use of the audio data recording / reproducing apparatus 1 described above, there are three corresponding parts (corresponding candidates) in the digital data of the recording medium A19 in response to the input of the search violin voice. By increasing the length of the speech signal for search, that is, by increasing the size of the array of frequency components obtained by the fast Fourier transform process, the second-order fluid condition is made highly accurate. It is possible to further reduce the number of locations.
However, for example, in the case where the same sound or all the same sound is recorded as digital data halfway through the recording medium A19, the recording / playback control unit 27 has the number of data related to the sound desired to be read. All of them are stored in the storage unit 26 as detection results and a message to that effect is displayed on the display unit 15.

In the use of the audio data recording / reproducing apparatus 1 described above, the audio signal of the radio receiver is input from the input terminal 3 and the sound of the violin is picked up as an audio signal by the right microphone 4 and the left microphone 5. Input of a signal related to sound from only the input terminal 3 or pickup of sound from at least one of the right microphone 4 and the left microphone 5 may be used.
In the use of the audio data recording / reproducing apparatus 1 described above, the digital data relating to the cue code is given by inputting the audio picked up by the microphone from the code input unit 6 in order to search the data portion desired to be read out. However, if there is a lot of audio data that you want to read out, record the audio related to the corresponding cue code, and play the cue audio related to the desired call if necessary. There is a method of providing digital data related to a code.

  In the use of the audio data recording / reproducing apparatus 1 described above, since the audio desired to be read is related to a violin, that is, a musical instrument, the number of corresponding points increases and it is difficult to specify the truly desired read portion. The type of voice was specified as the next fluid.For example, the voice to be recorded is very characteristic, such as the dictation of the investigation, the dictation of the observation record, etc. In the case of including sound, if the date and place are input as search sound with the same sound as the sound to be recorded, the data that is uniquely desired to be read can be easily read.

The audio data recording / reproducing apparatus 1 can easily read out desired audio data in a short time even if many audios are randomly recorded as digital data on the recording medium A19 having a large storage capacity. There is no need for information data indicating the position of data desired to be read and means for reading the information data, and therefore the configuration is relatively simple.
The audio data recording / reproducing apparatus 1 records the digital data related to the tune “Haru no Umi” read from the recording medium A19 on the recording medium B20, and then records other digital data on the recording medium B20. It is also possible to easily perform editing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of the best mode for carrying out the present invention as seen from an obliquely upper front. FIG. 2 is a block diagram illustrating the configuration and functions of an apparatus in the best mode for carrying out shown in FIG. 1.

Explanation of symbols

1: Audio data recording / reproducing apparatus 3: Input terminals 4, 5: Microphone 6: Code input unit 7: A / D conversion unit 8: Clock 9: Digital signal processor (DSP)
10, 11: Recording / reproducing unit 12: CPU
14: Operation unit 16: D / A conversion unit 17: Output terminal 19: Recording medium A
20: Recording medium B
25: FFT processing unit 26, 28: Storage unit 27: Recording / reproduction control unit 29: Audio coding processing unit

Claims (2)

Audio data for recording audio data on a recording medium, specifying and reading out a desired data portion from the entire data recorded on the recording medium, and performing at least one of reproduction, copying, and editing A recording / reproducing apparatus,
The entire digital data related to the audio to be recorded is extracted as to which frequency component is contained in what amplitude level by fast Fourier transform processing, the extraction result is recorded as search data, and read out. Similarly, for at least a part of the desired data, the target data indicating the relationship between the frequency component and the amplitude level is created by fast Fourier transform processing, and the desired data is read by collating the target data with the search data. An audio data recording / reproducing apparatus characterized in that a search is performed. When a desired data portion is specified and read out from the entire area of the digital data recorded on the recording medium, a sound-related signal or sound-related data corresponding to the desired data portion can be obtained by playing a musical instrument. 2. The audio data recording / reproducing apparatus according to claim 1, wherein the audio data is a voice, a signal related to the voice, or digital data.

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