JP3058491B2 - Recording and playback system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording system for encoding information of sound or voice and recording it on plain paper.

[0002]

2. Description of the Related Art Conventionally, as a recording method of this kind, information of sound or voice is encoded, and this code is recorded on plain paper in a form which can be optically read, such as large and small black circles, bar codes, and graphs. (Japanese Patent Application Laid-Open No. 60-134384).

According to such a recording method, since sound and voice can be recorded on plain paper in an optically readable format, it is possible to combine the code with characters, figures, and the like. Document can be obtained.

[0004]

However, in the above-mentioned conventional recording method, when it is desired to add a voice message of about 1 to 2 seconds to a part of a letter or a document created by a word processor or the like, a general dot printer is used. There is a drawback that when a code such as a voice is printed by using, the recording density is lowered.

Further, when trying to reproduce a code recorded on plain paper by the conventional recording method, it is very difficult to extract data including audio information from read image data with practical reliability. There was a disadvantage that it was.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a recording and reproducing system which solves the above-mentioned disadvantages, records sound and voice codes at a high density, and reproduces information from the recorded codes with high accuracy. It is in.

[0007]

[0008]

[0009]

[0010]

[0011]

According to one aspect of the present invention, there is provided a reproducing apparatus for reproducing a code of sound or audio information recorded on a paper in an optically readable state. In the method, a moving average of a two-dimensional pattern of dots representing codes read optically is taken at a predetermined size, and a marker group defining a data block for storing the codes is specified from the maximum value of the moving average. , The positions of the dots are obtained from the positions of the markers, and the dots are extracted from these positions.

Further, according to the present invention, in a reproducing system for reproducing a code of sound or voice information recorded in an optically readable state on paper, a dot representing the code read optically is provided. With respect to the two-dimensional pattern, an image is obtained at a pixel interval smaller than the dot interval of the pattern, digital superimposition integration is performed on the image using an averaging operator, and a maximum value is obtained from the result. By repeatedly obtaining the largest value among the residual values removed, a marker defining a data block for storing the code is specified, the positions of dots are obtained from the positions of the markers, and these positions are determined. Is used to extract dots.

[0013] Further, the invention according to claim 3 is a sound recording system for encoding information of sound or voice and recording the code on paper in an optically readable format.
A marker group defining a data block for storing the code is recorded, and a dot representing the code is recorded at a predetermined position in the data block with reference to the position of the marker. A moving average of a two-dimensional pattern of dots representing the read code is taken at a predetermined size, a marker group that defines a data block for storing the code is specified from the maximum value of the moving average, and the position of the marker is specified. , The positions of the dots are obtained, and the dots are extracted from these positions.

According to a fourth aspect of the present invention, there is provided an audio recording system for encoding information of sound or voice and recording the code on paper in an optically readable format.
A marker group defining a data block for storing the code is recorded, and a dot representing the code is recorded at a predetermined position in the data block with reference to the position of the marker. With respect to the two-dimensional dot pattern representing the read code, an image is obtained at a pixel interval smaller than the dot interval of the pattern, and the image is subjected to digital convolution using an averaging operator. The marker which defines the data block for storing the code is specified by repeating the calculation of the maximum value of the remaining values excluding it, and the position of the dot from the position of the marker is specified. , And dots are extracted from these positions.

[0015]

[0016]

According to the first aspect of the present invention, the marker can be easily extracted, the data can be easily extracted from the recording pattern by the extracted marker, and the sound and the voice can be reproduced with high accuracy. .

According to the second aspect of the present invention, data can be extracted from a recording pattern with high accuracy even when recording data is read obliquely.

According to the third aspect of the present invention, it is possible to record and reproduce a sound or voice information with high accuracy.

According to the fourth aspect of the present invention, it is possible to record and reproduce sound or voice information with high precision, and to reproduce with high precision even when the information is read obliquely.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a block diagram for explaining a recording system according to the present invention. FIG. 2 is an explanatory diagram of a recording result recorded by the above recording method.

In FIG. 1, an analog signal from a sound input device such as a microphone (not shown) is applied to an input terminal 11. The input terminal 11 is connected to an analog / digital (AD) converter 12 so that an analog signal is input to the AD converter 12. The AD converter 12 converts an input analog signal into a digital signal. The output of the AD converter 12 is connected to the coder 13 so that the digital signal from the AD converter 12 is supplied to the coder 13. Coder 13
Is a device for efficiently recording voice by compressing information using a known voice information processing technology. From the coder 13, a code string compressed corresponding to the input analog signal is obtained. The output of the coder 13 is connected to a pattern generator 14 so that the compressed code sequence from the coder 13 can be supplied to the pattern generator 14. The pattern generator 14 outputs “0”
A two-dimensional pattern is generated that expresses a compressed code string consisting of a dot and a "1" as dot presence / absence on a predetermined dot position. The output of the pattern generator 14 is connected to a printer 15 so that the two-dimensional pattern can be given to the printer 15. The printer 15
The input two-dimensional pattern is converted to plain paper 200 shown in FIG.
The recording result 210 can be obtained on a part of the plain paper 200 by recording on the plain paper 200.

FIG. 1 shows the operation of the embodiment constructed as described above.
This will be described with reference to FIGS.

FIG. 3 is a diagram for explaining an example of a format of a pattern including audio information to be recorded on plain paper.

An analog signal from the sound input device is input to an AD converter 12 via an input terminal 11. The AD converter 12 converts an input analog signal into a digital signal. Since the AD converter 12 converts the data into an 8-bit numerical sequence at a sampling rate of 8 [KHz] in order to maintain the quality of a normal telephone voice, information of 64 [K bits] per second is obtained. Amount. This AD converter 1
The output of 2 is connected to the coder 13 and gives a digital signal to the coder 13. The coder 13 compresses information using a known audio information processing technique. For example,
PARCOR commonly used for compressing audio information
By using the analysis method, etc.
It can be compressed to about [K bits]. Therefore, a code string compressed corresponding to the input analog signal is obtained from the coder 13. The compressed code sequence obtained from the coder 13 in this way is supplied to the pattern generation unit 14. The pattern generator 14 outputs “0”
Then, a two-dimensional pattern expressed on a predetermined dot position is generated based on a compressed code string composed of the compressed code string “1” and the presence or absence of a dot, and supplied to the printer 15. The two-dimensional pattern is recorded on the plain paper 200 by the printer 15, and a recording result 210 is obtained on a part of the plain paper 200.

FIG. 3 shows a recording result 210 recorded on the plain paper 200 in this manner. That is, between the markers M arranged at equal intervals in the rectangular coordinate system, dots corresponding to one of the bits of the code string of the compressed audio information are recorded at predetermined positions. Here, the white circles shown in FIG. 3 indicate the positions of the dots, the circles M indicate the black dots for the markers, the four circles M touching each other indicate the markers, and the circles A
To H indicate predetermined positions of respective dots representing 8-bit data.

Assuming that each area divided by a dotted straight line connecting the markers is called a data block DB, this embodiment shows a case where information of 8 [bits] is recorded in each data block DB. . The markers are composed of four adjacent dots and are arranged vertically and horizontally at an interval of five dots.

Here, the dot size is reduced to 1/4 [mm].
Then, the recording density becomes 512 [bits / cm ² ], and about 10 [K bits] of information can be recorded in a desired sound or audio information recording area of about 2 [cm] × 10 [cm]. . Therefore, as shown in FIG. 1, a voice message of about 1 second can be recorded in a part of the letter. 1/4 [mm] of the dot size is a value that can be copied with sufficient fidelity in a current copying machine.

FIG. 4 is a block diagram for explaining a method of reproducing an original sound from information recorded on plain paper, according to an embodiment of the reproducing method of the present invention.

In FIG. 4, the image scanner 21
Reads the record result 210 on the plain paper 200 and
Convert to a dimensional pattern. The image scanner 21 that performs such a function can be realized by using a generally available reader using an optical sensor or the like. The output of the image scanner 21 is connected to a data extraction unit 22 so that a two-dimensional pattern from the image scanner 21 is supplied to the data extraction unit 22. The data extraction unit 22 extracts data bits from a two-dimensional pattern obtained from the image scanner. The data extracting unit 22 is connected to a decoder 23, and supplies the data bits extracted by the data extracting unit 22 to the decoder 23. The decoder 23 performs tempering of the extracted data bits into audio information. The processing content of the decoder 23 is related to the processing content of the coder 13 in FIG. The output of the decoder 23 is connected to a digital-to-analog (DA) converter 24, and the signal from the decoder 23 is supplied to the DA converter 24. The D / A converter 24 converts the digital signal into an analog signal and outputs it from the output terminal 25 to the outside as a reproduced sound signal.

The operation of the thus-configured reproduction system will be described with reference to FIGS.

FIG. 5 is a diagram for explaining a procedure for extracting data from a recording pattern. In the following, in order to make the description easy to understand, one data block DB
A description will be given of a nearby image as an example. The numerical value corresponding to each dot represents the intensity of light, and a description will be given assuming that a position with a dot is “1” and a position without a dot is “0”.

The image scanner 21 is a plain paper 200
Is read and converted into a two-dimensional pattern, and this two-dimensional pattern is supplied to the data extracting unit 22. In the data extracting unit 22, data bits are extracted from the two-dimensional pattern. Here, the data extraction unit 22
5A, the image read by the image scanner 21 has "0" and "1" arranged in a rectangular coordinate system according to the presence of a dot, as shown in FIG. It will be. The data extracting unit 22 includes a data storage unit. The extracted data is temporarily stored, and thereafter, the data stored in the data storage unit is read whenever necessary, thereby performing the following processing. Is made. Here, for simplicity of explanation, the pixel size of the image scanner is the same as the dot size, but in actuality, an image scanner with pixels smaller than the dot size is used, and the signal obtained by each pixel is used. The intensity is multi-step.

The data extraction unit 22 calculates the sum of the values of four adjacent pixels for the image of FIG. 5A with respect to the center of the four adjacent pixels as shown in FIG. An image in which "4", "2", "1", and "0" are arranged in a matrix is obtained. That is, when a moving average is calculated using a mask having the same size as that of the marker, as shown in FIG.
The position of the peak value of the moving average (in this embodiment, the value indicated by “4”) is the position of the marker. Data extraction unit 22
Calculates the data dot positions (A) to (H) from these marker positions as shown in FIG. 5 (d).
Next, based on the data dot positions (A) to (H), the data extraction unit 22 extracts a pixel value at the position, as shown in FIG.
Extract bits. Actually, the image scanner 21
The image sensed by is affected by rotation and distortion of the optical system, but the shape of the marker is close to a circle, so the position of the marker can be easily determined with high accuracy by the peak of the moving average, and the data based on the position of this marker・ Since dot sampling is performed, stable and accurate data extraction is possible even for rotation and optical system distortion.

The data bits extracted in this manner are tempered into audio information by the decoder 23. That is, when the recording result 210 is compressed by the PARCO analysis method, the decoder 23
It is decoded by the COR synthesis method and returned to audio information. The restored audio information is converted into a reproduced sound by the DA converter 24 and output from the output terminal 25. The analog signal from the output terminal 25 is amplified by an amplifier circuit or the like (not shown), and then the original sound is reproduced by a sound output device such as a speaker.

It should be noted that, in the above description, when the recording result 210 of the plain paper 200 is read by the image scanner 21 with the plain paper 200 set at an accurate position on the image scanner 21, The extraction operation has been described. However, in practice, the plain paper 200 may be set obliquely on the image scanner 21. Further, when the image scanner 21 is of a handy type, it may be read diagonally because it is operated by moving it by hand. The extraction operation of the data extraction unit 22 in this case will be described below with reference to FIGS.

FIGS. 6 to 8 are explanatory views for explaining the procedure of processing when a recording pattern is read diagonally.
In this description, the image scanner 2 having a pixel interval of 1/3 of the dot interval of the recording result 210 of the plain paper 200 will be described.
Description will be made below assuming that the data is read at step 1.

It is assumed that the image read by the image scanner 21 is f = (f _ij ). In this image f, as shown in FIG. 6, black dots M and dot circles A to H are read obliquely. Then, since the image scanner 21 reads at a pixel interval of ド ッ ト of the dot interval of the recording result 210, the image scanner 21 reads “black dots M” and “dots A to H” in FIG. 0 ”,“ 3 ”,
Data indicating values such as "7" and "6" is obtained. This data is provided to the data extraction unit 22.

In the data extracting section 22, first, FIG.
With the circular neighborhood type smoothing operator h = (h _ij ) shown in
The digital superposition integral of the input image f = (f _ij ) is performed. If the image obtained in this way is g = (g _ij ),
Is obtained.

[0040]

(Equation 1)

Next, the data extraction unit 22 obtains a pixel value g _i1j1 indicating the maximum value among the pixels of the image g, and obtains the pixel value g _i1j1.
Image g ′ = _i1j1 where the value of the pixel near the circle is “0”
(G ′ _ij ). This image g 'is obtained as follows. That is, when the ^{_{(i-i 1) 2 +}} (j-j 1) 2 <3.5 2,
g ′ _ij = 0 (i−i ₁ ) ² + (j−j ₁ ) ² ≧ 3.5 ²
The g ′ _ij = g _ij data extraction unit 22 then _{finds the} largest value g ′ _i2j2 among the pixels of the image g ′ _ij , and sets the value of the pixel near the circle of the pixel g ′ _i2j2 to “0”. The image g ″ = (g ″ _ij ) is obtained.

The data extraction unit 22 obtains (i ₁ , j ₁ ), (i ₂ , j ₂ ),... By repeating these operations. These values are the coordinates of the marker.

The data extracting section 22 terminates the repetition when the above-mentioned maximum value becomes equal to or less than a preset value.

When the marker is detected, the data extracting unit 22
As shown in FIG. 8, distances L ₁ , L ₂ , L ₃ , and L ₂ from marker M ₀ to other markers M ₁ , M ₂ , M ₃ , M ₄ , M ₅
The _four markers M ₁ , M ₂ , M ₃ , M ₄ are selected in ascending order of L ₄ , L ₅ (here, L ₁ <L ₂ <L ₃ <L ₄ <L ₅ ), and similarly, other markers M for markers M _1, other markers M for marker M _2, another marker M relative to the marker M _3, by selecting and so ...., data
Cut out block DB.

The data extraction unit 22 outputs the data block D
When B is cut out, the position of the data dot included in the data block is obtained, and the input image f =
By sampling the pixel at the position of the data dot from (f _ij ) and binarizing it at a predetermined threshold level, data can be extracted.

Therefore, according to the above apparatus, the plain paper 2
Even if 00 is set diagonally in the image scanner 21, data can be reliably extracted.

[0047]

[0048]

As described above, according to the first aspect of the present invention, it is easy to extract a marker, and it is easy to extract data from a recording pattern by using the extracted marker. Can be reproduced with high precision.

According to the second aspect of the present invention, data can be extracted from a recording pattern with high accuracy even when recording data is read obliquely.

According to the third aspect of the present invention, it is possible to record and reproduce a sound or information of a voice with high accuracy.

According to the fourth aspect of the present invention, there is an excellent effect that a sound or information possessed by a sound can be recorded and reproduced with high precision, and even if the information is read obliquely, the reproduction can be performed with high precision.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a recording system according to the present invention.

FIG. 2 is an explanatory diagram showing a recording result obtained on plain paper in an example of the present invention.

FIG. 3 is an explanatory diagram showing an example of a recording information recording format which is a feature of the present invention.

FIG. 4 is a block diagram showing a configuration example of an apparatus for reproducing from a recording result according to the present invention.

FIG. 5 is a diagram for explaining an operation of reproducing by the apparatus.

FIG. 6 is a diagram for explaining another operation of reproducing by the apparatus.

FIG. 7 is an explanatory diagram showing an example of an operator used when explaining other operations.

FIG. 8 is a diagram illustrating a data extraction operation in a data extraction unit of the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Input terminal 12 AD converter 13 Coder 14 Pattern generation part 15 Printer 21 Image scanner 22 Data extraction part 23 Decoder 24 DA converter 200 Plain paper 210 Recording result f Image h Operator

Claims (4)

(57) [Claims] 1. A reproducing method for reproducing a code of sound or voice information recorded in a state readable optically on paper, wherein a two-dimensional pattern of dots representing the code read optically is moved at a predetermined size. Taking an average, specifying a marker group that defines a data block for storing the code from the maximum value of the moving average, obtaining the position of the dot from the position of the marker, and extracting the dot from these positions A playback method characterized by: 2. A reproduction method for reproducing a code of sound or voice information recorded in an optically readable state on a sheet of paper, wherein a two-dimensional pattern of dots representing the code read optically is defined as: An image is obtained at a pixel interval smaller than the dot interval, digital superimposition integration is performed on the image using an averaging operator, and a result having a maximum value is obtained from the result. By repeatedly determining the position of the dot, a marker defining a data block for storing the code is specified, the position of the dot is determined from the position of the marker, and the dot is extracted from the position. Characteristic playback method. 3. Encoding information of a sound or voice,
In a recording method for recording this code on paper in an optically readable format, a marker group that defines a data block for storing the code is recorded, and a dot representing the code is determined based on the position of the marker. Recording at a predetermined position in the data block, taking a moving average of a two-dimensional pattern of dots representing an optically read code with a predetermined size, and storing the code from the maximum value of the moving average. A recording / reproducing method for identifying the marker group that defines the data block of (1), finding the position of the dot from the position of the marker, and extracting the dot from the position. 4. Encoding information of a sound or voice,
In a recording method for recording this code on paper in an optically readable format, a marker group that defines a data block for storing the code is recorded, and a dot representing the code is determined based on the position of the marker. The two-dimensional pattern of dots representing codes read optically is recorded at predetermined positions in the data block, and an image is obtained at a pixel interval smaller than the dot interval of the pattern, and the image is averaged. Data for storing the code by repeating digital superposition integration using an operator, finding the largest value from the result, and finding the largest value among the remaining values excluding it. Identify a marker that defines a block, find the position of the dot from the position of the marker, and extract the dot from these positions Recording and playback system which is characterized the door.