JPS63187297A - Recording/reproducing system for sound wave information - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is a recording and reproducing method for recording sound wave information on a sheet and reproducing the recorded sound wave information, more specifically, the sound wave information is recorded on the same sheet together with characters and images. Concerning methods for recording and reproducing.

Conventionally, records and magnetic tapes are well known as long-term violet sound wave information recording media. However, these require special equipment (tape recorder) for recording and playback.

Recently, cards and sheets have been coated with magnetic book film,
Magnetic information is written on the magnetic thin film, and letters, pictures, photographs, symbols, etc. are printed on it. In other words, one card or sheet carries both magnetic information and visible information.

Magnetic information can also be converted into audio information. However, recording both visible information and magnetic information requires two devices: a printing device and a magnetic recording device.

These two devices have completely different recording principles.

Card or sheet conveyance mechanisms may be shared, but write heads and head drivers must be provided individually.

With the recent development of office automation equipment, text creation and editing (character information processing) are now widely performed using word processors, and input, correction, and creation of illustrations, halftone images, etc. (illustration information processing, halftone information processing), etc. process)
Information processing can now be easily performed using additional input means such as a scanner, input board, or input tablet, and if necessary, a mouse, and advanced editing processing that combines these information processes on one screen has also been put into practical use. However, audio information is recorded on magnetic media and requires a dictation machine (tape recorder). Therefore, even if visible information and audio (sound wave) information are recorded on a single card or sheet, it is necessary to coat or paste a magnetic thin film on the card or sheet, and it is necessary to apply a magnetic thin film to the card or sheet. It requires two things: a printing press (including a copying machine) or printer, and a magnetic recording device. In view of the above-mentioned circumstances, the present applicant first made it possible to visually record audio information in a reproducible manner on a card or sheet, and to record character information and illustration information using a single recording means.

We have proposed an audio information recording and reproducing device that can reproducibly record audio information in addition to visual information such as halftone information.

FIG. 9 is an external view showing an example of the audio information recording and reproducing device previously proposed by the applicant, and FIG. 10 is a system diagram for explaining the operation of FIG. In FIG. 10, a word processor body 100 equipped with a CRT display 1161 and a floppy disk device 118, 119 includes a microphone 1211 and a speaker 1.
221, keyboard 1172, image reading scanner 117
1 and a laser printer 1173 are connected.

The combination of the word processor body 100, the keyboard 1172, and the laser printer 1173 is a so-called English-Japanese word processor.
2, and record the text on a floppy disk using the disk device 119, or write it using the laser printer 11.
73 to print out.

The combination of the word processor main body 100, the keyboard 1172, and the scanner 1171 is a so-called image processing device, which edits the image read by the scanner as necessary, records it on a floppy disk, or prints it out.

The word processor main body 100 is connected to a local network, and the word processor main body 100 and the keyboard 1172 . The scanner 1171 and laser printer 1173 constitute a so-called facsimile device, which prints out images received from other stations (facsimile devices), and also prints out image data of originals set in the scanner and records them on floppy disks. data stored in the internal memory of the word processor main body 100 is transmitted to another station.

The combination of the scanner 1171 and the laser printer 1173 is configured as a so-called digital copying machine, but there is an image reading mode in which only the scanner operates and provides a video signal (digital) to the host (word processor body 100), and a video signal from the host. It operates in three modes: a print mode for printing out (digital) images, and a copy mode for reading original images with a scanner and printing them out.

In addition to the conventional functions described above, the above-mentioned device is capable of storing the voice blown into the microphone 1211.

It has playback and printout functions, and audio data is processed alone or in combination with image information.The functions are summarized as follows.

a0 Document creation and editing function: You can create and edit various documents. For example, in addition to the functions of a standard Japanese/Roman word processor, you can use various fonts, input images, collections, forms, graphs, and numbers. creating and processing tables;
It is equipped with these synthetic editing, page layout, and document formatting functions.

b. Audio recording editing function...The audio captured by the microphone is converted into compressed data, and this compressed data is used alone or in the above a.
Processed in combination with text data.

C1 Audio printout function: Prints out the compressed data of the above.

d. Audio playback function: Plays back compressed data in RAM and compressed data on floppy disk to play back audio. The compressed data read by the scanner is played back into audio. In addition, the audio captured by the microphone is simultaneously played back by the speaker.

e. Function to use commercially available programs: Equipped with a function to use commercially available programs.

f. Terminal function: Equipped with a function to search for files in devices connected via the communication station, use programs, etc.

g. Print function: Equipped with a function to print created documents, audio compressed data, etc.

h. Copying function: Equipped with a function for performing normal copying.

i. Storage function: Equipped with a function to record created documents, audio compressed data, etc. on a floppy disk.

j. Search function: Equipped with a function to search for files in a file station (not shown) connected to the local network.

k.Transmission function...Using the local network,
A function for sending and receiving documents, audio compressed data, etc. between other stations (not shown), and sending and receiving documents, compressed audio data, etc. between external devices via a communication station (not shown).
It has the function of transmitting and receiving compressed audio data, etc.

As shown in FIG. 10, the word processor main body 100 uses a transceiver T in its communication control unit CCU120.
It is connected to the local network cable 12o1 via R.

This cable 1201 is, for example,
This is a local network cable disclosed in No. 28, to which various stations are connected. The word processor main body 100 is one workstation of this network.

Word processor body 100 which is a workstation
may be input with a mixture of audio (compressed data), documents (text, graphics), and images (pixels), or portions thereof. Here, the compressed data is data obtained by A/D converting an audio analog signal into 8-bit digital data in the digital processing circuit 121, and is
The data is compressed into 4-bit data by predictive encoding processing in 12), where text is a set of coded characters and graphics is coded graphical information, such as circles, arcs, etc. This is a collection of commands to draw etc. Also, an image (pixel) refers to an image in pixels (
Bit string information that is divided into pixels (dot pixels) and corresponds to black and white information, brightness and color information of a pixel with bits "1" and "0", and is used by the scanner 117 in FIG.
It is input from 1. Note that text and graphic information can also be input from the scanner 1171, but at the time of input, these are treated as image information. The word processor main body 100 also has functions for creating and editing documents. In other words, in addition to standard Japanese, Roman, and word processor functions, it also includes the use of various fonts, image editing, form creation, graph creation, illustration creation, creation and processing of numerical tables, composite editing of these, page layout, It has document formatting functions. In these processes, audio compressed data is also processed in the same way as these data. It also has programming capabilities and can create programs using standard languages. It also has a terminal function and can search for files on a host computer connected via a communication station, use programs, etc.

Furthermore, it has a storage function, and documents created with the main body 100 (
(including compressed audio data: the same applies below) or files,
and file station, host computer,
It has the function of storing documents or files transferred from facsimiles, other workstations, etc. on floppy disks. The image information can be stored after being compressed according to a specification. The main body 100 also has a search function. In other words, main unit 1, which is a file station and its own workstation,
It has a function to search for 00 floppy files.

The main body 100, which is a workstation, further includes:

It has a transmission function. That is, sending documents or messages to and from other stations, such as image synthesizers and facsimile machines, using the resources of the network;
It has the function of receiving data.

Note that the image information can be compressed and transferred if specified.

Data can be input into the main body 100 using a microphone 1211, a keyboard 1172, or a scanner 1171, an external facsimile signal via a communication line, or a host computer.

Transfer the completed document to another workstation, send it via fax, or print it to a laser printer.
173, input processing is performed as pixel (image) information from the scanner 1171. In this case, the main body 100 handles all information in pixels (dot bits: bits in audio compressed data), compresses the data, and sends it to the network. If the recipient of the transmission is a workstation, it will be treated as an e-mail.
When the workstation is working, the arrival of mail is displayed on a part of the screen of the display device 1161 to notify the operator. The operator is
At an appropriate time, the document can be recalled to the screen. In this case, since the information is in pixels, the data is restored from its compressed format, subjected to linear density conversion to pixels for screen display, and then sent to the display 1161. The original compressed information is.

Since it remains in memory, it is determined whether to save or delete it depending on the operator's instructions.

Next, as for how to use a scanner, firstly, there is the reading of various images, and secondly, there is the input of a large amount of documents.If all the images or documents are audio compressed data (usually audio from recording paper) There are three modes: playback), a part of which is compressed audio data, and a case where all of the data does not include compressed audio data.

In the word processor main body 100, audio.

When creating a text that is a mixture of text, graphs (illustrations), and pictures, audio is transmitted through the microphone 1211, text is transmitted through the keyboard 1172, and illustrations are transmitted through the keyboard 1172.
(graph processing input), pictures are input from the scanner 1171, and these are synthesized. In that case, by running an image processing program on the main body 100, it is possible to freely edit, such as moving two positions, enlarging, reducing, etc. To assist in this task, the display 116
Image 1 can be subjected to multi-window processing. In other words, the image on the screen can be either a completely divided image or an image made by stacking multiple sheets of paper offset from each other. In the former, each image is reduced, while in the latter, the image is The size remains the same, but some parts are no longer visible. In addition, the system status and currently available commands are also displayed in the system area on the display.

When the compound document created in this way is stored in memory, the code (text information, illustration information) and
Stored in the form of compressed pixels (halftone images, pictures, sounds). Also, if you want to send this compound document to another workstation in the same way as the image information mentioned above,
The other workstations receive the transmitted code and compressed pixel information and decompress the code (letters) and pixels (pictures, sounds) using a character generator to display this information on the display 1161. By doing this, the pit stream is developed on the bitmudge memory. If this pit stream information is DMA-transferred to the video RAM 116 of the display 1161, exactly the same information as that of the sending workstation will be displayed on the display 116 of the receiving workstation.
1 will be displayed on top. In the same way, the file station also develops the pit stream on the pit map memory, and the subsequent processing is the same as that for the pixel information described above to print or store the pit stream.

FIG. 11 shows the digital processing circuit 121 shown in FIG.
and a circuit diagram for explaining details of the analog processing circuit 122. The interface for A/D converting the audio signal, that is, the digital processing circuit 121 includes an amplifier that amplifies the audio signal of the microphone 1211, and an amplifier that adjusts the audio signal level. It consists of an offset adjuster, low-pass filter, sample-and-hold circuit, and A/D converter.

The audio signal is converted into 8-bit data and provided to microprocessor 112 via bus 1211.

Microprocessor 112 compresses the 8-bit data to 4 bits using predictive encoding, processes the compressed data in the same manner as pixel information, and writes it to memory.

In the case of audio playback, microprocessor 112 decodes the audio pixel information (compressed data) to obtain 8-bit data and outputs the audio signal (analog) via bus 1121.
is provided to an interface, ie, an analog processing circuit 122, for reproducing the data. The analog processing circuit 122 has 8
A D/A converter that converts bit data into an analog signal;
It is composed of a buffer amplifier, a low-pass filter, and an output amplifier, and energizes the speaker 1221 at a level corresponding to 8-bit data.

As mentioned above, the word processor main body 100 has various functions and handles a huge amount of image information and audio information, so it is equipped with a plurality of processors (CPUs). The main processor 111 performs parallel processing, that is, as shown in FIG.
and the sub-processor 112 are connected by a multipath 1110,
Communication between the two is performed via the main memory 113. Connection between the two is performed using an interrupt signal or a status signal.

The image data is transferred from the processor 111 to the processor 112 by
This is done via the memory 113.

Local buses 1111, 1110 are connected to both processors 111, 112, respectively, and memories 114, 115, . Keyboard 1172 and scanner 117 via parallel I10
1 and printer 1173, encoder compressor, decoder 115
1. Image processing units 1152, 1153
, external memory or FDD (floppy disk drive unit) 1 via controllers 118 and 119
181, 1191, CRT via controller 116
A display device 1161 and a communication control device 120 are connected.

The communication control device 120 connects the word processor main body 100 to a communication line, and when connected to one communication line, when there is a call from the line and when the processor 111 calls the line (another station). The processor 111 is connected to the communication line.

The processor 111 (CPUI) functions as the main processor of the word processor and manages all tasks except for display tasks. Therefore, the O8 (operating system) of the word processor 100 runs on this processor 111. Also, when in the idle state, the diagnostic program (Diagn)
ostic Program) can be run. Additionally, it has a built-in parallel processor 10, serial ■/○ ports, timer, and interrupt control circuit.

The processor 112 (CPU2) is a subordinate entity of the processor 111 (CPUI) as described above, and the CR
It operates for T-display image processing and audio data compression/playback processing. Using A/D conversion data (treated in the same way as pixels) sent from the digital processing circuit 121 and character codes, pixels, vectors, etc. sent from the processor 111 via the memory 113, the final A picture-filled document bitmap is synthesized on RAM (320KB). Then, the completed picture mixed document bitmap is transferred to (7) VRAM (192 KB) in the CRT controller 116.

When playing audio, the bitmap audio compressed data on the RAM is extracted and decoded one word (4 bits) at a time.
Bit data is created and provided to the analog processing circuit 122.

The CRT controller 116 generates a water-type direct synchronization signal and video signal for a high-resolution CRT display.
A VRAM is built in as a display memory, and data is transferred from the RAM in the processor 112. This controller 116 is a Japanese language landscape (Landsca).
pe) type CRT and boat rate type for English text (resolution 94
5x1260 dots) monochrome raster scan system can be connected.

Memory 113 is used to transfer image data (character codes, pixels, vectors) from processor 111 to processor 112. A character generator exists in a part of the memory area. Memory address space is 1024K
It is B.

Memory 114 is the main memory of word processor 100, and has a memory address space of 1.5 MB.

It also has dual port functionality, i.e. local bus 111
Interface with 1 and parallel I10 module 1
It has an interface with 17. As a result, scanner data is directly transferred from the parallel computer 10 module, and keyboard and mouse (indication of cursor position) codes are also transferred.

The parallel I10117 has 12 ports (96 bits) as a parallel I10 interface, and transfers scanner data (keyboard, mouse, and scanner data) directly to the memory 114 without going through the local bus 1111.

The keyboard 1172 includes three types of character keys (for kana-kanji conversion, for tablet kanji input, and for alphabetic characters) and 16 function keys.

The scanner 1171 has a maximum reading size of A3, a resolution of 12 dots/I1m (3000 PI), and can read sheet-type originals.

FDCs 118 and 119 control FDDs (floppy disk drive units) 1181 and 1191.

Floppy disks are double-sided double density (IMB/DRIV)
E) is used. In addition to storing programs, local files, kana-kanji conversion dictionaries, and character generators, these are also used as logout memories.

Once the floppy data is read into memory.

A separate floppy for recording texts, etc. is attached to one of the disks, and written texts, etc., are recorded and recorded texts, etc. are read out.

The image processing unit (IPUI) 1151 has a binary DCR (data compression and reproduction) function.

The image processing unit (IPU2) 1152 has a function of density conversion and enlargement/reduction. The density conversion is 12 → 4 dots/+wm.

12→6 dots/ymm, 12→8 dots/+i+a,
There are 8 → 12 dots/am, and the expansion/reduction is 0
．． It can be set between 5 and 2 times in 0.1 steps.

Image processing unit (IPU3) 1153 has an image rotation function. Rotates +90@ in one step.

The communication control device 120 controls the exchange of data transmitted via the local network, and performs protocol control including layers up to at least the data link level. In other words, control of the data link layer includes decomposition of data capsules. physical layer control includes data encoding (preamble generation/
removal (for synchronization), bit encoding/decoding)
and channel access (bit transmission/reception, carrier sense, collision detection).

The transceiver TR is directly connected to the communication medium (coaxial cable) of the local network, and is connected to the communication control device 120.
and transceiver TR are connected by a transceiver cable.

According to the above device, audio data is visibly recorded on paper or an equivalent sheet in the same way as ordinary characters or images are recorded. The recorded image of the audio data is visible, but 1
Normally people cannot recognize the meaning, but audio data is obtained by reading the image on the recording sheet with a widely used scanner, such as the scanner used in facsimile machines.

When this data is reproduced into an audio signal using the inverse logic of the digital conversion and a speaker is energized with this audio signal, the recorded audio is reproduced. Further, according to the above device, the level of the audio analog signal is A/D converted into digital data having a relatively large number of bits, for example, 8 bits or more, and furthermore, this digital data is predictively encoded to be, for example, 4 bits or less. It uses a digital conversion means that compresses digital data with a relatively small number of bits. According to this, digital processing of audio signals can be performed with relatively simple hardware and relatively simple program processing, and moreover, it can be recorded easily. Since the number of dots (bits) is reduced, it is possible to record audio over a relatively long period of time on a single piece of paper or a similar sheet or card (hereinafter, paper and similar sheets or cards are collectively referred to as a sheet). For example, word processors are often used for shorthand or dictation, but when dictation requires the use of a word processor,
It is possible to switch from text input to voice recording by instructing voice recording through keyboard operations, or to perform parallel processing of text input and voice recording.

In addition, there are cases where it is preferable to record the author's (or dictator's) real voice instead of or together with the signature on the word processor's text, but in such cases, the word processor's CPU, etc. If the digital conversion means hardware is connected to the CPU, etc., and an audio signal/digital signal converter is incorporated into the word processor, both text and audio data can be combined and recorded on one sheet. It is also possible to record text and audio data for each sheet. The recording device is essentially a word processor and does not require an audio recording device such as a tape recorder. Furthermore, since a sheet made of the same material is used for both text recording and audio data recording, a special audio data recording medium is not required.

Furthermore, in CAD (computer aided design), it is preferable to add the designer's explanatory voice or identification voice in addition to recorded drawings or illustrations, and even in facsimile, it is preferable to add the explanatory voice or identification voice of the designer in addition to the recorded drawings or illustrations. not.

It is desirable that the sender's voice be automatically reproduced from the data recorded on the original at the same time as the original is received, or by reproducing the audio signal from the received paper. It also includes information entered with a keyboard, input tablet, mouse, and/or image scanner.
Or, in addition to records of read graphs, illustrations, photographs, or pictures, it is preferable to record a combination of explanatory audio, background music, natural sounds, recitation audio, etc. According to the above device, These can be used for either.

The present invention has been made for the purpose of increasing the amount of sound wave information that can be recorded and reproduced in the above-mentioned sonic wave (audio) information recording and reproducing device. In order to achieve this purpose, in a sound wave information recording and reproducing method that records sound wave information on a sheet and reproduces the sound wave information recorded on the sheet, it is possible to reduce the amount of sound wave information by data compression or thinning. It is characterized in that it records a visual image on a sheet, reads the visible image, and reproduces sound wave information by data interpolation or expansion.

The present invention will be explained in detail below.

FIG. 1 is an overall block diagram for explaining one embodiment of the present invention, and in the figure, 1 indicates a microphone.

2 is an A/D converter, 3 is a controller having a buffer memory function, 4 is a data compression section, 5 is a data expansion section, 6
is a D/A converter, 7 is a data storage memory, 8 is a scanner, 9 is a printer, and 10 is a speaker. First, the sound wave information to be recorded is converted into an analog electrical signal by the microphone 1, and then the A/D converter. 2, the sound wave digital signal is converted into a sound wave digital signal at a certain predetermined sampling period.Next, this sound wave digital signal is compressed and encoded by the data compression unit 4, and printed as a visible image along with characters, images, etc. by the sheet printer 9. . For reproduction, the image scanner 8 reads this visible image, and the data decompression section 5 restores the sound wave digital signal.

D/A conversion is performed at a predetermined sampling period to produce an analog signal, and this analog signal is reproduced as a sound wave through the speaker 10.

The present invention has been made especially for the purpose of increasing the sound wave information in the above-mentioned sound wave information reproducing/recording device, and in the block diagram shown in FIG. The structure of part 5 is distinctive.

FIG. 2 is a diagram for explaining the actual sound waveform processed by the present invention and its encoding, and the middle part of FIG. 2(b') continues from the fist in FIG. 2(a). .

In the figure, A indicates maximum amplitude, B indicates minimum amplitude, and P indicates pitch. In Fig. 2, the waveform part means an irregular waveform part where the waveform or amplitude changes from moment to moment, and the amplitude part means a repeating part of the same waveform where the waveform is constant or the amplitude is constant or changing. , a silent section means a sound waveform below a certain threshold level.

In FIG. 1, the data compression unit 4 includes a silence/speech determination unit 4□, an encoding unit 42. Amplitude detection section 41. Pitch detection section 4
．． , a matched filter (detecting unit with the same waveform) 4s, etc., and the input sound waves are silent.

The sound determination unit 4□ determines whether there is a sound or not.

If it is a silent part, encoder 4. counts the number of data (time) of the silent part and encodes it.

On the other hand, if it is a sound part, it is checked whether the pitch has been detected by the pitch detection section 44, and if not, the input sound wave is encoded as is (for example, DPCM). For example, a matched filter 4. determines whether the input sound wave waveform (one pitch) has the same shape as the encoded waveform (one pitch). If the waveform has a different shape, the input sound wave is encoded as is. If the waveforms have the same shape (it is rare for the waveforms to be exactly the same, a threshold is set to check the degree of similarity), the amplitude detection unit 4. Encode the amplitude detected by .

FIG. 3 is a detailed diagram of the silence/speech determination section 41 shown in FIG. 1, in which 4□a is a memory; b is a determination unit, and this silent/sound determination unit 4□ determines whether the input sound wave is a silent part or a sound part, and it determines whether the input data is a predetermined value with a change amount. There is no sound when the sound is smaller, and no sound at other times. Specifically, it is determined whether the upper bits of the sound wave information input (multiple) are all 0. When the output is 0, there is no sound wave information, and when the output is 1 (in this case, there is sound) In this case, one of the higher-order bits is 1), indicating that sound wave information is present.

FIG. 4 is a detailed diagram of the encoding unit 42 shown in FIG. a is a counter, 4. b is a gate circuit that opens silently; 4. c is a gate circuit that opens when there is a sound and pitch cannot be detected.
Input terminal a receives the output signal from the silence/sound determination section 4□, input terminal A receives the sound wave information input signal from the controller 3, and input terminal C receives the undetectable output signal from the pitch detection section 44. , the input terminal d receives a sound wave information input signal from the controller 3, the input terminal e receives a detectable output signal from the pitch detection section 44, and the input terminal f receives a matched filter 4. The output signal (same waveform) is as follows.

In addition, an output signal from the amplitude detection section 4□ is supplied to the input terminal g, and the output signal from the amplitude detection section 4□ is supplied to the input terminal g.
3. Pitch detection section 44. Matched filter 4. The number of silent portion data (time) that appears at the output terminal i based on the information from the output terminal i, and the sound wave information signal (input waveform) that appears at the output terminal i.
, or the amplitude (maximum, minimum) signal appearing at output terminal j.

FIG. 5 shows the amplitude detection section 4 shown in FIG. In the detailed diagram of
In the figure, 4. a is the first delay circuit; 4. b is the first subtractor; 4. c is the second delay circuit; 4. d is the second subtractor, 4
．． e is a multiplier; 4. f is a comparator.

43g is a reference voltage (0 volt) generator; 4. h is a gate circuit that opens when the output of the comparator 43f is (-), and this amplitude detecting section 4. When a pitch is detected, the amplitude of the maximum point and minimum point of the waveform of one pitch of the input sound wave is detected.

FIG. 6 is a diagram for explaining the operation of the amplitude detection section shown in FIG. 5. When the signal levels at points a, b, and a in FIG. 5 are set as a, b, and a in FIG. .

FIG. 6(A) shows the case when b is the maximum, and FIG. 6(B) shows the case when b is the minimum. In both cases, the comparator 4
．． The output signal of f becomes (-). Moreover, FIG. 6(C) and FIG. 6(D) both show cases where b is not the maximum or minimum, and in these cases, the output signal of the comparator 43f is (+
).

FIG. 7 is a detailed diagram of the pitch detection section 44 shown in FIG. 1, in which 44a is the delay circuit 4. a controller that sets the delay time of c;4. b is a buffer.

44c is a delay circuit; 4. d is a subtracter, 44e is a converter (
44f is an adder, 44h is a reference voltage generator (threshold signal (Th: positive value close to OV) generator, L4mg is a comparator, and the sound wave input from input terminal a) The pitch of the information waveform is detected, and a pitch detectable output signal is output to the output terminal C, and a pitch detectable output signal is output to the output terminal C.

This pitch detection is performed when the current audio signal is Xn.

(where n is the current time, Xn is the amplitude, and j is the window (time width) for pitch detection.

Δt is the pitch, and j and Δt are 2.5ms in time.
It shall take a value of ~20m5 (general pitch width).

), Yn(Δt) is a certain (threshold value)
If it is smaller than the value of Δt, the pitch is determined as Δt, and otherwise it is assumed that the pitch cannot be detected. The matched filter calculates the correlation C between two signal sequences an and bn using the following formula.

(However, l an If If bn II is an, bn
represents the norm of ) Now, if C0 is a certain predetermined value (threshold value) and C>CI, then an and bn have the same waveform. Further, if C≦C0, an and bn have different waveforms.

FIG. 8 is a detailed diagram of the code/decoder 5□ shown in FIG.
In the figure, 5□a is a decoder, and 5□b is a silent part.

51c is a waveform section, 51d is an amplitude section, and 51e is an OR circuit. This code decoder decodes the encoded signal from the encoding section 42 inputted to the input terminal a into a sound wave information digital signal. , the silent section 51b outputs the same amount of data as silence, the waveform section 5□C restores and outputs the waveform, and 51d is the maximum point.

Based on the amplitude information of the minimum point, the waveform is the same as the one-pitch waveform restored immediately before (both congruent and similar cases are possible, but it is rare that the amplitudes are also the same, so in most cases it is "similar"). ) is synthesized and output.

Now, in the silence/speech determination section, if it is determined to be silent, the number of data (time) is encoded, and if it is determined to be voiced, the data is thinned out (for example, every other one), and the remaining data is (e.g. DPCM). For playback, silent parts are output as silent by the number of silent parts, and for sound parts, the data is restored and the parts thinned out by 1 are interpolated (
For example, the sound wave information data is reproduced (data expanded) by averaging the before and after.

As is clear from the above description, according to the present invention, the amount of sound wave information that can be recorded and reproduced can be increased, and the time that can be recorded on one sheet can be lengthened.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram for explaining one embodiment of the present invention, FIG. 2 is a diagram for explaining the actual sound wave waveform processed by the present invention and its encoding, and FIG. teeth,
4 is a detailed diagram of the encoding unit, FIG. 5 is a detailed diagram of the amplitude detection unit, and FIG. 6 is a diagram for explaining the operation of the amplitude detection unit. , FIG. 7 is a detailed diagram of the pitch detection section, FIG. 8 is a detailed diagram of the encoder/decoder, and FIG. 9 is an external view showing an example of the audio information recording/reproducing apparatus previously proposed by the applicant. FIG. 10 is a system diagram for explaining the operation of FIG. 9, and FIG. 11 is a detailed circuit diagram of the digital processing circuit and analog processing circuit shown in FIG. 1...Microphone, 2...A/D converter, 3.
...Controller, 4...Data compression section, 5...Data decompression section, 6...D/A converter, 7...Data storage memory, 8...Scanner, 9...Printer ,1
0...Speaker. 7 Yashi 6 3rd figure rb j14 Figure 5 Figure 6 (A) (B
) No. 7 rlA m6 figure-N Procedural amendment (Shark) March 26, 1988 Patent Application No. 19392 2, Name of invention Recording and reproducing method of sound wave information 3, Relationship with the person making the amendment Patent Applicant Otari Nakamagome Address 1-chome Nakamagome, Ota-ku, Tokyo [No. 13-6 Name (674) Ricoh Co., Ltd. Representative Hama 1
) Hiro 4, Agent address: 1-2-7 Furocho, Naka-ku, Yokohama 231
Shear Train Yokohama No. 807 Voluntary Issue 6, Claims column 7 of the specification to be amended, and Claims of the description of contents of the amendment are amended as shown in the attached sheet. Claim (1) In a sound wave information recording and reproducing method for recording sound wave information on a sheet and reproducing the sound wave information recorded on the sheet, the sound wave information is reduced in data amount by data compression or thinning. A method for recording and reproducing sound wave information, characterized in that the sound wave information is recorded on a sheet as a visible image, the visible image is read, and the sound wave information is reproduced by data interpolation or expansion. (2) The sound wave information recording and reproducing method according to claim (1), wherein the number of data for silent portions is encoded. The recording and reproducing method for sound wave information according to claim 1 or 2, characterized in that only how many times the amplitude is encoded is encoded. Playback method.

Claims (4)

[Claims] (1) In a sound wave information recording and reproducing method that records sound wave information on a sheet and reproduces the sound wave information recorded on the sheet, the sound wave information is compressed or thinned out to reduce the amount of data and converted into a visible image. A method for recording and reproducing sound wave information, which is characterized in that the sound wave information is recorded on a sheet, its visible image is read, and the sound wave information is reproduced by data interpolation or expansion. (2) The sound wave information recording and reproducing method according to claim (1), wherein the number of data for silent portions is encoded. (3) For the part where the same waveform continues at a certain pitch, encode the waveform for one pitch, and only check how many times the amplitude of the encoded waveform is for each waveform for one pitch. A method for recording and reproducing sound wave information according to claim 1 or 2, characterized in that the method encodes the sound wave information. (4) Regarding the sound part, the data is thinned out and data compression encoded.
or (2).