JPH04364271A - Method and device for recording and transmitting information, information recording medium and information reproducer - Google Patents

Abstract

PURPOSE:To secure a high S/N ratio by replacing prescribed bits of lower order of an audio data with a non-audio data and transmitting it during the time when the audio data or its envelope signal as a compared value is in excess of a positive or negative specific value. CONSTITUTION:The non-audio data is given to a block forming means 22, and is block-structurized and outputted, while an analog audio signal is given via an A/D converting means 21 to a level detecting means 23 and a replacing means 24. The audio data to be outputted from the means 32 is monitored by the means 23, and when it exceeds the specific value, a replacement commencing command 26 is given to the means 24. Lower-order 4 bits of the audio data is replaced with a non-audio data block by the means 24 from the time of performing the commencing command to the time of finishing transmitting one non-audio data block outputted from the means 22. This output is given to an output processing means 25, and a digital data to be outputted is modulated and outputted to suit characteristics of a transmitting path and a recording medium. As a result, a high S/N ratio can be secured even in the case of a small sound volume.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information recording and transmitting device and method for recording and transmitting information by mixing non-acoustic data with acoustic data, an information recording medium, and an information reproducing device. It is.

[Conventional technology]

As a conventional device for transmitting a mixture of acoustic data and non-acoustic data, there is, for example, an information recording and transmitting device disclosed in Japanese Patent Laid-Open No. 58-219832. FIG. 14 is a format diagram of signal transmission in this conventional information recording and transmitting device. In this figure, assuming that the signal which is the recording unit is a 16-bit format, the lower two of this signal format are
Using bit as flag code Fc, flag code F
Digital audio data and non-audio image data are transmitted by changing the format of the upper 14 bits according to c. For example, when the flag code Fc is "00", the first
14-bit linear quantized audio data Ad as shown in Figure 4(a), and 10-bit linear quantized audio data as shown in Figure 14(b) when the flag code Fc is "01" Ad and 4-bit image data Vd, and the flag code Fc is "10" as shown in FIG. 14(c).
When , 10-bit nonlinear quantized acoustic data A
d, 4-bit image data Vd, and flag code Fc are “
11'', 9-bit nonlinear quantized acoustic data Ad and 6-bit image data Vd are transmitted as shown in FIG. 14(d).

[Problem to be solved by the invention]

However, this method has the following drawbacks. One is that when non-acoustic data is mixed, the non-acoustic data is always recorded in the lower bits, so the number of bits for transmitting the acoustic data decreases and quantization noise increases. Therefore, there is a drawback that the S/N ratio of the acoustic signal is reduced.

This becomes a problem especially at low volumes when the acoustic signal is small. Furthermore, if all data is erroneously A/D converted as audio data, there is a drawback that noise will be reproduced even during silent periods. For example, if this information recording and transmission method is applied to a compact disc and acoustic data and non-acoustic data are recorded, when played back on a normal compact disc player, even when the acoustic data is 0, the non-acoustic data becomes the acoustic signal. This caused a major problem when considering compatibility with existing equipment.

The present invention has been made in view of the problems of conventional information recording and transmitting devices, and it is possible to achieve a high S/N ratio at low volumes even when transmitting non-acoustic data mixed with the lower bits of audio data. It is an object of the present invention to provide an information recording and transmitting apparatus and a method thereof that ensure a high ratio and do not reproduce noise during silent periods. Another object of the present invention is to provide a recording medium recorded by such a method, and further to provide an apparatus capable of reproducing audio data and non-acoustic data by reproducing signals recorded on the recording medium.

[Means to solve the problem]

The information recording and transmitting device according to the invention of claim 1 of the present application simultaneously transmits an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data. An information recording and transmission method for recording or transmitting, in which the value of acoustic data is the compared value, and at least one of the points in time when the compared value exceeds a positive specified value or becomes less than or equal to a negative specified value. The invention is characterized in that the lower K bits (K<N) of the non-acoustic data block are recorded or transmitted with a delay from the non-acoustic data block from the point in time. It is characterized by being long.

The invention according to claim 3 is an information recording and transmitting method for simultaneously transmitting an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data, If the value of the acoustic data is the compared value, and period A during which the compared value is greater than or equal to the positive specified value is longer than the specified time, period B during which the compared value is less than or equal to the negative specified value is longer than the specified time. In at least one of the cases, the lower L bits (L<N) of the audio data are replaced with the non-acoustic data block for a specified time period in period A or period B, and in other cases, the audio data is transmitted. The invention according to claim 4 is characterized in that in the above transmission method, the compared value is replaced with the value of the acoustic data and its envelope signal is used. . Further, the information recording medium according to the invention of claim 5 of the present application is:
This is an information recording medium recorded by each of the above methods.

Further, the information recording and transmitting device according to the invention of claim 6 of the present application simultaneously transmits an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data. An information recording and transmitting device, comprising a blocking means for adding a synchronization pattern to each predetermined bit of non-acoustic data to form a non-acoustic data block, and a provision that the value of the acoustic data is a compared value and the compared value is positive. level detection means for detecting at least one of the points at which the value is greater than or equal to the negative specified value and outputting a replacement start signal; The data block is divided into K bits, and the lower K bits (K
<N) with a non-acoustic data block, respectively, according to claim 7.
The invention is characterized in that the non-acoustic data block has a fixed length.

The invention of claim 8 of the present application is an information recording and transmitting device that simultaneously transmits an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data. a blocking means for adding a synchronization pattern to each predetermined bit of non-acoustic data to form a non-acoustic data block; level detection means for detecting at least one point in time when the level is below a specified negative value; delay means for delaying the acoustic data given to the level detection means by a predetermined time; and delay means using a replacement start signal given by the level detection means. and substituting means for dividing the obtained non-acoustic data block into K bits and replacing each of the lower K bits (K<N) of the acoustic data with a non-acoustic data block. The invention according to claim 9 is characterized in that in the level detecting means, the compared value is replaced with the value of the acoustic data, and an envelope signal of the acoustic data is used as the compared value.

The invention of claim 10 of the present application is an information reproducing device for reproducing a signal recorded or transmitted by replacing an acoustic data string and a non-acoustic data string consisting of N bits of acoustic data, wherein an input signal is given and N input processing means for outputting digital data of bits; separation determination means for monitoring lower predetermined bits of the digital data obtained from the input processing means and outputting a separation command when a synchronization pattern is detected; The apparatus is characterized by comprising a separation means for separating upper predetermined bits of the N-bit digital data reproduced by the input processing means as audio data and lower predetermined bits as non-acoustic data. The invention is characterized in that the separation determination means supplies a separation signal to the separation means at a constant time after the synchronization pattern is detected.

[Effect]

According to the information recording and transmission method and apparatus of the present application having such characteristics, a predetermined synchronization pattern is added to non-acoustic data, and the acoustic data or its envelope signal is used as a comparison value to set a positive or negative predetermined value. While the audio data exceeds the audio data, predetermined lower bits of the audio data are replaced with non-acoustic data and recorded or transmitted. Also, according to the information reproducing device of the present application,
The lower predetermined bits of the N-bit digital data reproduced by the input processing means are monitored to detect a synchronization pattern, and if a synchronization pattern is detected, the upper predetermined bits are converted into audio data and the lower predetermined bits by the separation means. is output as non-acoustic data.

〔Example〕

The information recording and transmitting apparatus, its information recording and transmitting method, and information recording medium of the present invention will be explained below. First, a first embodiment will be described with reference to FIGS. 1 to 4 and Tables 1 and 2. FIG. 1 is a diagram showing the principle of an information recording and transmitting method according to a first embodiment of the present invention.

First, FIG. 1(a) shows an analog audio signal 11 to be recorded, and a prescribed value 12 is set at a positive predetermined level. FIG. 1(b) shows the digital data to be transmitted or recorded in accordance with this, in which data string 13 is a data string in which the lower bits are not replaced, and data string 14 is a synchronization pattern and blocks as described later. A data string 14 including non-acoustic data is shown.

FIG. 2 is a block diagram showing the configuration of the information recording and transmitting apparatus in this embodiment. In this figure, an analog audio signal is given to A/D conversion means 21.

The A/D conversion means 21 converts the analog audio signal into A with a quantization bit number of 16 and a sampling frequency of 44.1 KHz.
/D conversion and converts it into acoustic data expressed in two's complement representation. Also, non-acoustic data is processed by blocking means 22.
given to. The blocking means 22 adds a synchronization pattern and data indicating the amount of non-acoustic data to create a block structure, and outputs a non-acoustic data block. The output of the A/D converting means 21 is given to a level detecting means 23 and a replacing means 24. The level detection means 23 is A/
The value of the acoustic data output from the D conversion means 21 is monitored, and if the value exceeds the specified value 12 shown in FIG. 1(a), a replacement start command is given to the replacement means 24. The replacement means 24 replaces the lower 4 bits of the audio data with a non-acoustic data block from the time when the replacement start command is issued until the transmission of one non-acoustic data block output from the blocking means 22 is completed. , the output thereof is given to the output processing means 25. The output processing means 25 modulates the output digital data according to the characteristics of the transmission path and recording medium and outputs the modulated data. Further, 26 is a replacement start signal that transmits a replacement start command from the level detection means 23 to the replacement means 24.

Now, FIG. 3 shows a block diagram of an information reproducing apparatus that receives and reproduces data, and a digital signal obtained from a transmission path or a recording medium is given to input processing means 31. The input processing means 31 demodulates this signal and provides a digital signal to the separation determination means 32 and the separation means 33. Separation judgment means 3
Reference numeral 2 detects a synchronization pattern starting from the lower four bits of the digital data, and supplies a separation signal 34 to the separation means 33 when a predetermined synchronization pattern is detected.

The separating means 33 separates the digital data into acoustic data and non-acoustic data in accordance with this separation command. Now, FIG. 4 shows an example of data that is blocked by the blocking means 22, where 41 is a synchronization pattern, 43 is non-acoustic data, and 42 is the amount of non-acoustic data 43 included in the non-acoustic data block. It is data.

Next, the operation of this embodiment will be explained. First, on the data sending side, the A/D conversion means 21 converts the audio data into 16-bit digitized audio data expressed in two's complement representation as described above. The level detection means 23 monitors whether or not the specified value 12 is exceeded, and the points t1 and t when the specified value is exceeded.
In step 2, a replacement start command is output. This replacement start command is transmitted to the replacement means 24 by setting the replacement start signal 26 to L. The blocking means 22 adds a synchronization pattern and a data length to the non-acoustic data to form a non-acoustic data block and outputs it. The synchronization pattern 41 is added to detect non-acoustic data blocks on the data receiving side, and should preferably be one that is unlikely to occur in normal audio data. In this embodiment, (OFFFO)h is the synchronization pattern 41. When this pattern is transmitted by replacing the lower 4 bits of audio data, the lower 4 bits of the data of 4 consecutive samples are (O)h, (F)h, (F)h, (O), respectively.
It is transmitted in the form of h. Here, a sample is one piece of digital data, and in this embodiment, indicates 16-bit audio data or digital data. Since the lower bits of the audio data output from the A/D conversion means 21 are close to random numbers, it is considered that the probability that the values of the lower 4 bits of four consecutive samples are the same as the above is considered to be low. Also, non-acoustic data 4 included in the non-acoustic data block
The data 42 indicating the data amount of No. 3 indicates the period for separating the non-acoustic data 43 on the data receiving side,
This is fixed length data that indicates the number of samples that need to be separated. For example, data 42 indicating the amount of non-acoustic data 43
The size of the data is 8 bits, and the non-acoustic data 43 is
If it is a 6-character ASCII code called "low", 8 bits of data are required for each character, so the amount of data of the non-acoustic data 43 is 48 bits, and the data 42 indicating the amount of data of the non-acoustic data 43 is (OC)h (48 [bits] ÷ 4 [bits/sample]). In this way, the non-acoustic data block shown in FIG. 4 is formed. Based on the acoustic data to be transmitted, the non-acoustic data block output from the blocking means 22, and the replacement start signal 26, the lower four of the acoustic data are The bit is replaced with a non-acoustic data block divided into 4 bits and output.The non-acoustic data block shown in Figure 4 is 9 bytes in size, so it is output continuously from the time the replacement start command is received. Replacement is performed for 18 samples.

This corresponds to the replaced data string 14 shown in FIG. 1(b). The digital data output from the replacement means 24 is processed by the output processing means 25 in accordance with the characteristics of the transmission path and recording medium, and is output. For example, when using a compact disc as an information recording medium, the digital data output from the replacing means 24 is
ross Interleave Reed-Solo
mon Code) and EFM (Eight t
o Fourteen Modulation) Modulation is performed to add control signals such as synchronization signals and time information, and the data is recorded on a compact disc.

Now, if the positive specified value 12 is (0100) h and the non-acoustic data block is (OFFO...57) h shown in FIG. 4, the acoustic data input to the level detection means 23 and the replacement start signal 26, The relationship between the data output from the replacement means 24 is as shown in Table 1 below. Here, the acoustic data is sent to the level detection means 2 in order from the smallest sample number.
3 shall be input.

Next, the operation on the data receiving side will be explained. The digital data processed on the transmission side in accordance with the characteristics of the transmission path is demodulated by the input processing means 31. For example, in the above example, a signal is read out using an optical pickup from a compact disc on which acoustic data and non-acoustic data are recorded.
It is demodulated by performing processes such as synchronization signal detection, EFM demodulation, and CIRC cancellation, and 16-bit digital data is output. The separation determining means 32 monitors the lower four bits of this digital data and detects a synchronization pattern. Then, it is monitored whether the lower four bits of the data of four consecutive samples are (O)h, (F)h, (F)h, (O)h in order. When the synchronization pattern 41 is detected, the following data length 42 is read and a separation command is sent to the separation means 33 to separate data corresponding to this data length. The separation command is communicated by pulling the separation signal 34 low. In this example, the data length 42 is (OC)h, so 12
A separation command is sent to perform separation on sample data.

When the separation signal 34 is H, the separation means 33 outputs the digital data output from the input processing means 31 as audio data as it is, and when the separation signal 34 is L, it separates the upper 12 bits and lower 4 bits of the digital data. and output them as acoustic data and non-acoustic data, respectively. next second
The table shows the digital data input to the separation judgment means 32,
The relationship between the separation signal 34 and the data output from the separation means 33 is shown.

(Left below) As a result of such separation, as shown in Figure 1 (a) and (b), when the acoustic signal 11 is greater than the positive specified value 12, the lower 4 bits of the acoustic data are replaced with non-acoustic data. Data column 1
4 is transmitted, and when the value of the acoustic data is smaller than the positive specified value, the acoustic data string 13 is transmitted as is.

In this way, according to this embodiment, by selectively mixing non-acoustic data in the lower bits of the portion where the amplitude of the acoustic signal is large, it is possible to ensure a high S/N ratio even at a low volume, and also to prevent errors. Even when all the data is reproduced as audio data, the influence on the audio signal can be reduced.

Next, a second embodiment will be described with reference to FIGS. 5 to 7 and Tables 3 and 4. FIG. 5 is a principle diagram of the information recording and transmitting apparatus in the second embodiment, and the same parts as in FIG. 1 are given the same reference numerals and detailed explanations are omitted. FIG. 6 is a block diagram of an information recording and transmitting apparatus for transmitting data, and the same parts are given the same reference numerals and explanations will be omitted. In this embodiment, the blocking means 62 takes non-acoustic data as input and creates a block structure by adding a synchronization pattern for every fixed amount of data, and provides a fixed-length non-acoustic data block to the replacing means 64. . The replacement means 64 replaces the lower four bits of the acoustic data with a non-acoustic data block for a certain period of time from the time when it receives a replacement start command given from the level detection means 23. Further, in FIG. 7, the separation determining means 72 is a separation determining means that monitors the lower bits of the digital data output from the input processing means 31 and outputs a separation command for a certain period of time after detecting a synchronization pattern.

The non-acoustic transmission block shown in FIG. 8 does not have a data portion corresponding to the data length 42, and is a format diagram of a non-acoustic data block composed of a synchronization pattern and non-acoustic data.

Next, the operation of this embodiment will be explained. In the information recording and transmitting apparatus, an analog audio signal is converted into a digital value by an A/D converting means 21, and a fixed length non-acoustic data block is provided to a replacing means 64 by a blocking means 62. The replacement means 64 replaces and outputs the lower 4 bits of the acoustic data every 4 bits of the non-acoustic data block for a certain period of time T from the time when it receives the replacement start command at time t3, and in other cases, it replaces the input output the acoustic data as is. Therefore, as shown in FIG. 5(b), a data string 14 in which the lower bits are replaced for a certain period T is output.

Table 3 shows the relationship between the acoustic data output from the A/D conversion means 21, the replacement start signal 26, and the digital data output from the replacement means 64. Here, the positive specified value 12 is (0
100)h, and the acoustic data is input to the level detection means 23 in order from the smallest sample number.

(Left below) Next, the operation on the data receiving side will be explained. The input processing means 31 and the separation means 33 operate in the same manner as in the first embodiment.

The digital data output from the input processing means 31 is given to the separation determination means 72 and the separation means 33. The separation determining means 72 monitors the lower four bits of the digital data output from the input processing means 31 to detect a synchronization pattern. That is, it is monitored whether the lower 4 bits of the data of 4 consecutive samples are (O)h, (F)h, (F)h, (O)h in that order. Once the synchronization pattern is detected, a separation command is sent to separate the non-acoustic data from the following 12 samples of digital data. Separation means 33
Then, as in the first embodiment, digital data is separated into audio data and non-acoustic data according to the separation command.

Table 4 shows the relationship between the digital data given to the separation determining means 72, the separation signal 34, and the data output from the separation means 33. However, it is assumed that the positive specified value 12 is (0100)h, and the acoustic data are input to the separation judgment means 2 in order from the smallest sample number.

As a result, digital data in which the lower 4 bits of the acoustic data are replaced with non-acoustic data blocks for a certain period T from time t3 and t4 when the value of the acoustic signal exceeds the positive specified value 12 in FIG. The sequence 14 is transmitted, and the otherwise unreplaced acoustic data sequence 13 is transmitted.

Therefore, according to this embodiment, the following advantages can be obtained by mixing fixed-length non-acoustic data blocks in the lower bits for a certain period of time from the time when the value of acoustic data exceeds a positive specified value. One is that non-acoustic data can be transmitted in preset units by adjusting the number of bits to be replaced and the size of the non-acoustic data block.

For example, in this embodiment, non-acoustic data is transmitted in units of 6 bytes. Therefore, when actually transmitting non-acoustic data, it becomes easy to handle the non-acoustic data. Second, by recording data in a portion of the acoustic signal where the amplitude is large, non-acoustic data can be transmitted with less influence on the acoustic signal when all data is reproduced as acoustic data.

Next, a third embodiment of the present invention will be described using FIGS. 7 to 10 and Table 5. In this embodiment, the blocks of the information reproducing device and the non-acoustic data blocks are the same as those in the second embodiment described above.

FIG. 9 shows the analog signal and the digital data to be transmitted. When the analog audio signal 11 is continuously larger than the positive specified value 12 for a certain period of time, the digital data whose lower bits have been replaced by the non-acoustic data block is transmitted. Indicates the sending state.

FIG. 10 is a block diagram showing the configuration of the information recording and reproducing apparatus on the data sending side, and the same parts as in the conventional example described above are given the same reference numerals and detailed explanations will be omitted.

In this embodiment, the digital signal of the A/D conversion means 21 is given to the level detection replacement instruction means 103 and the delay means 107. The level detection replacement instruction means 103 is the A/D conversion means 2
1 detects that the period during which the value of the acoustic data output from 1 is equal to or greater than the positive specified value 12 continues for a predetermined time or more, and when the acoustic data corresponding to this portion starts to be output from the delay means 107, the replacement means 64 A replacement start signal 26 is sent to the address. Further, the delay means 107 is the A/D conversion means 2.
The acoustic data outputted from 1 is temporarily stored, and after a predetermined time has elapsed, the data is sequentially outputted starting from the data inputted first and given to the replacement means 64.

The other configurations are similar to those of the embodiment described above.

Next, the operation of this embodiment will be explained. First, on the information recording and transmitting device side, the size of the audio data block is a fixed length of 8 bytes, and the audio data block shown in FIG. 8 is transmitted, and the prescribed time to be delayed by the delay means 107 is 16 samples. When the A/D conversion output is given from the A/D conversion means 21, the delay means 107 temporarily stores the audio data until data after 16 samples is sent from the A/D conversion means 21, and then outputs it. Further, the level detection and replacement instruction means 103 monitors whether the value of the acoustic data from the A/D conversion means 21 is equal to or greater than the specified value 12. When the value of the acoustic data exceeds (0100)h, it is monitored whether 16 samples of data of this level or higher are continuously sent.

When 16 samples are consecutive, the replacement start signal is set to L. The replacement means 64 replaces the lower 4 bits of the audio data delayed by 16 samples from the delay means 107 with a non-acoustic data block for 16 samples from the time when the replacement start signal becomes L. Table 5 shows the relationship between the acoustic data output from the A/D conversion means 21, the replacement start signal 26, the acoustic data output from the delay means 107, and the digital data output from the replacement means 64.

(Left below) Next, the information reproducing device on the data receiving side will be described. On the data receiving side, the sent digital data is demodulated in the same way as the data receiving in the second embodiment, and the separation determining means 7
2 and is input to the separation means 33. The separation determination means 72 monitors the appearance of the synchronization pattern 41 in the lower 4 bits of the digital data, and when the synchronization pattern appears, the separation signal 34 is output while the subsequent 12 samples of digital data are input to the separation means 33. Let be L. Separation means 3
3, digital data is separated into upper 12 bits and lower 4 bits according to this separation signal 34, and outputted as acoustic data and non-acoustic data, respectively.

As a result, as shown in FIG. 9, the lower 4 bits of the audio data are replaced with a non-acoustic data block only during a period 91 in which the period in which the audio signal 11 is greater than or equal to the positive specified value 12 lasts for a certain period Ta or more. A data string 14 is transmitted; otherwise, an audio digital data string 13 is transmitted.

No non-acoustic data blocks are transmitted during a period 92 that does not last longer than the specified time Ta even if the value of the acoustic data 11 exceeds a positive specified value.

As described above, in this embodiment, a fixed length non-acoustic data block is transmitted when the period in which the acoustic signal exceeds the positive specified value continues for a specified period of time or more, so that the following advantages can be obtained. One is when transmitting non-acoustic data mixed with the lower bits of audio data, by recording only in the parts where the level of the audio signal is high, fixed length data can be transmitted while reducing the effect on the audio signal. can do.

In particular, even if the volume suddenly decreases, non-acoustic data will not be recorded in the low-acoustic portion, so the impact on auditory perception can be reduced.

Furthermore, even when all 16-bit digital data is converted into an audio signal as audio data on the data receiving side, the effect that noise is not output as audio during silent periods can be obtained.

Next, regarding the fourth embodiment of the present invention, FIGS. 8 and 11 to 13
This will be explained with reference to the figures and Table 6. In FIG. 11(a), 11 is an analog acoustic signal, and in FIG. 11(b)
shows the envelope signal 111.

FIG. 11(c) shows the digital data to be transmitted, which is a data string 14 in which the synchronization pattern and data are replaced with lower bits during the time period when the envelope signal exceeds the positive specified value, and data with no replacement at other times. This shows a state in which column 13 is sent out.

FIG. 12 is a block diagram showing the configuration of the information recording and transmitting apparatus of this embodiment, and the same parts as those of the above-described embodiments are given the same reference numerals, and detailed explanation will be omitted. In this embodiment, the digital audio data output from the A/D conversion means 21 is given to an envelope calculation replacement instruction means 123 and a delay means 127. The envelope calculation replacement instruction means 123 calculates the value of the envelope of the acoustic data output from the A/D conversion means 21, and the acoustic data whose corresponding envelope value is equal to or greater than a positive specified value is transmitted from the delay means 127. Replacement means 6 when output
A replacement start command is sent to 4.

Further, the delay means 127 consists of a first-in, first-out type storage device that holds the applied acoustic data and outputs it after a certain period of time.
The delayed output is given to replacement means 64. The other configurations are similar to those of the embodiment described above.

Next, the operation of the fourth embodiment will be explained. In the following explanation, it is assumed that the positive specified value 12 is (1000)h, and the non-acoustic data block to be replaced with the lower bits of the acoustic data has a fixed length as shown in FIG. Further, in this embodiment, for the sake of simplicity, the envelope is defined as a straight line connecting data having maximum values of adjacent samples. Data having a maximum value indicates data having a larger absolute value than the two sample values before and after. First, the data sending side will be explained. A/D conversion means 21
gives 16-bit acoustic data to the envelope calculation/replacement instruction means 123 and the delay means 127 as in the first embodiment. An example of acoustic data is shown in FIG. 13 and Table 6. In Table 6, it is assumed that data is output from the A/D conversion means 21 in order from the smallest sample number.

(The following is a blank space) The delay means 127 delays the input acoustic data by a certain period of time, for example, 50 samples, and outputs the delayed data to the replacement means 64. This delay absorbs the time difference from the time when the acoustic data is output from the A/D conversion means 21 to the time when the envelope calculation delay instruction means 123 finishes determining whether to issue a replacement start command for that data. It is for the purpose of

Next, the envelope calculation replacement instruction means 123 performs the following processing. First, a positive local maximum value detection process is performed.

This is data that has a maximum value when three judgments are simultaneously correct: whether the target data has a positive value, is larger than the previous input data, and is larger than the next input data. do. For example, in FIG. 13, if data 134 with sample number [N+10] is the data to be inspected, this data has a positive value and the preceding and succeeding data 1
Since it is larger than 36 and 137, it is determined that the data has a positive local maximum value.

Second, the envelope equation is calculated. This is done by calculating the equation of a straight line that connects data with adjacent positive maximum values. In this example, data 133 of sample number N and data 134 of sample number N+10 are data having adjacent positive maximum values, so a straight line connecting them is calculated using the following equation. In Cartesian coordinates where the vertical axis is X and the horizontal axis is Y, where X is the sample number and Y is the data value, the envelope is the coordinates (N, (800)h) and (N+(A)h, (18
00) h). Therefore, for simplicity, the envelope is calculated using only the upper 12 bits (with the lower 4 bits set as 0). Generally (x1, y1) and (x2, y2
) is the equation of the straight line passing through . Expressing the above value in decimal and substituting it, Y=
409.6X+2048-409.6N This corresponds to straight line 132 in FIG. Table 6 shows the envelope values corresponding to the sample numbers of each acoustic data calculated using this formula.

Third, calculate the sample number of the data to start replacing. This is the envelope equation (1
) to find the value of the envelope 132 corresponding to the sample number, and the value of the envelope corresponding to which sample is initially the positive specified value 131, and in this example (100
0) This is done by checking whether it is greater than or equal to h. In this example, data 138 of sample number [N+5] corresponds to this.

Fourthly, when the data having the sample number to start replacement obtained in the previous process is output from the delay means 127, the replacement start signal 26 is set to L and a replacement start command is sent to the replacement means 64.
Send to. At this time, the acoustic data and the replacement start signal 26 are synchronized by the envelope calculation replacement instruction means 123 and the delay means 12.
7 at the same timing, and that the envelope calculation replacement instruction means 123 recognizes the amount of delay in the delay means 127, and that the envelope calculation replacement instruction means 123 should start the replacement. This can be achieved by recognizing the sample number of the acoustic data. That is, the envelope calculation replacement instruction means 123 is the A/D conversion means 21.
The sample number of the acoustic data output from the delay means 127 is determined by counting the number of acoustic data output from the delay means 127 and adding the delay time in the delay means 127 to the sample number of the input acoustic data. For example, data of sample number N is A
The sample number of the acoustic data output from the delay means 127 when output from the /D conversion means 21 is [N-50]
It is. Next, the sample number of the audio data to start replacement obtained in the third process is compared with the sample number of the audio data output from the delay means 127, and when they match, a replacement start command is output. Now, in the processing up to this point, it is necessary to wait for the data that comes after that data to determine whether or not to replace it. For example, to detect data that has a positive maximum value, the value of the data after that data is required, and whether the lower bits that do not have a maximum value are replaced depends on the data that has a positive maximum value after that data. You won't know until it's entered. For this reason, a time lag occurs between the output of audio data from the A/D conversion means 21 and the determination of whether or not to replace the data. In order to absorb this, delay means 127 for synchronization is provided. Therefore, it is necessary to perform the processing from inputting audio data to determining whether or not to replace the data within the delay time of the delay means 127.

Next, the replacement means 64 and the output processing means 25 perform operations similar to those in the second embodiment, and output acoustic data and non-acoustic data from the transmission path or information storage medium. The operation on the data receiving side is the same as in the second and third embodiments described above. As a result, digital data 14 in which the lower bits of the acoustic data are replaced with non-acoustic data blocks is transmitted for a certain period of time from when the value of the envelope 111 becomes equal to or higher than the positive specified value 12 in FIG. In this case, the acoustic data 13 is transmitted as is. The perceptual volume is expressed by the width of the volume signal, that is, the envelope 111, and the microscopic value of the acoustic signal 11 does not have much meaning. That is, even if the value of the acoustic data obtained by A/D converting the acoustic signal 11 is 0, if the amplitude of the entire waveform of the acoustic signal is large, the perceptually loud volume is large;
Even if non-acoustic data is mixed with this 0 acoustic data, it does not cause much problem in terms of auditory sense.

As described above, in this embodiment, the envelope is used as the value to be compared, and the lower bits of the audio data are replaced with the non-acoustic data block from when the value of the envelope exceeds a positive specified value, thereby achieving the following advantages. is obtained. One is that the influence on the acoustic signal can be reduced by mixing non-acoustic data only in portions that are audibly loud. 2
One of the advantages is that data can be recorded continuously in areas with high volume, and non-acoustic data can be transmitted in relatively large units. Thirdly, since the parts with and without noise persist to some extent, the effect is that the noise becomes less noticeable to the listener's senses.

In each of the embodiments described above, the number of bits of the audio data is 16 bits, but the audio data may have any number of bits such as 20 bits or 8 bits.

Further, in each embodiment, the number of bits for replacing acoustic data with a non-acoustic data block was set to 4 bits, but any value may be used as long as it is less than the number of bits of acoustic data. Furthermore, the synchronization pattern is not limited to the patterns listed in each of the embodiments described above, but may be any pattern that allows the information reproducing device to detect a non-acoustic data block. For example, [(*FFFF*)h: However, * is (F
) Any number other than h] or (01234560)h can be selected. Furthermore, in each reception described above, a case has been described in which only positive specified values are specified, but only negative specified values may be specified, or both positive and negative specified values may be specified. Furthermore, in each of the above-mentioned devices, a compact disk was explained as a recording medium, but a transmission path such as an optical fiber or a coaxial cable may also be used, and various media such as digital audio tape for transmitting and recording digital data may be selected. Can be done. Furthermore, in the first embodiment, when forming a non-acoustic data block, it has data corresponding to the data amount in order to detect the end of the non-acoustic data block at the time of separation. Various methods can be employed to detect the end of a non-acoustic data block, such as by adding a pattern.

Further, although the non-acoustic data block is 9 bytes in the first embodiment and 8 bytes in the second to fourth embodiments, it can take any value. Furthermore, in the fourth embodiment, the envelope equation is a straight line passing through the data having two local maximum values, but the envelope may also be a curve obtained by quadratic approximation of the data having local maximum values for three adjacent units. good.

Furthermore, in the fourth embodiment, the delay time of the delay means 127 is set to 5.
0 samples, but an arbitrary length longer than the time required for the processing for the envelope calculation replacement instruction means 123 to output a replacement start command for the acoustic data output from the A/D conversion means may be selected. Can be done.

〔Effect of the invention〕

As explained in detail above, according to the present invention, when transmitting non-acoustic data mixed with the lower bits of acoustic data,
A synchronization signal is added to the non-acoustic data block, and the non-acoustic data block is recorded in the lower bits when the absolute value of the acoustic data is large or when the absolute value of the envelope data is large. Therefore, a high S/N ratio can be ensured even when the volume is low, and noise will not be reproduced during silent periods. Furthermore, it becomes possible to reproduce data including non-acoustic data blocks as is by using a recording medium such as a normal compact disc.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of the information recording and transmitting method in the first embodiment of the present invention, FIG. 2 is a block diagram of the information recording and transmitting device in the first embodiment, and FIG. 3 is a diagram of the information reproducing device in the first embodiment. Block diagram, FIG. 4 is a format diagram of a non-acoustic data block in the first embodiment, FIG. 5 is a principle diagram of an information recording and transmission method in a second embodiment of the present invention, and FIG. 6 is an information diagram in the second embodiment. A block diagram of the recording and transmitting device, FIG. 7 is a block diagram of the information reproducing device of the second embodiment, and FIG. 8 is a block diagram of the information reproducing device of the second embodiment.
, a format diagram of a non-acoustic data block in the fourth embodiment, FIG. 9 is a principle diagram of the information recording and transmitting method in the third embodiment of the present invention, and FIG. 10 is a block diagram of the information recording and transmitting device in the third embodiment. , FIG. 11 is a principle diagram of the information recording and transmitting method in the fourth embodiment, FIG. 12 is a block diagram of the information recording and transmitting device in the fourth embodiment, and FIG. 13 is a diagram of acoustic data and envelope curves in the fourth embodiment. The fourteenth explanatory diagram showing the relationship is a transmission signal format diagram of a conventional information recording and transmission method. 11...Analog acoustic signal 12...Positive specified value 13
... Data string with lower-order information replaced 14 ... Data string with lower-order bits replaced 21 A/D conversion means 22, 62 ...
Blocking means 23...Level detection means 24, 64
...Replacement means 31...Input processing means 32, 72...
Separation judgment means 33...Separation means 103...Level detection replacement instruction means 107, 127...Delay means 111...
...Envelope 123...Envelope calculation replacement instruction means. Patent applicant Yoshiki Okamoto, patent attorney representing Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] Claim 1: An information recording and transmitting method for simultaneously transmitting and recording or transmitting an acoustic data string consisting of acoustic data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data. The value of the acoustic data is the compared value, and the non-acoustic data block is processed from at least one of the points in time when the compared value exceeds a positive specified value or becomes less than or equal to a negative specified value. An information recording and transmitting method characterized in that the lower K bits (K<N) of the non-acoustic data block are recorded or transmitted with a delay from the non-acoustic data block. 2. The information recording and transmitting method according to claim 1, wherein the non-acoustic data block has a fixed data length. 3. An information recording and transmission method for simultaneously transmitting an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to the non-acoustic data, the method comprising: If the data value is the compared value, and period A during which the compared value is greater than or equal to a positive specified value is longer than the specified time, period B during which the compared value is less than or equal to the negative specified value is greater than or equal to the specified time. In at least one of the cases, the lower L bits (L<N) of the acoustic data are replaced with the non-acoustic data block for a specified time within the period A or the period B; otherwise, the An information recording and transmitting method characterized by transmitting and recording or transmitting acoustic data. 4. The information recording and transmitting method according to claim 1, wherein the compared value is an envelope signal of the acoustic data instead of a value of the acoustic data. Information record transmission method. 5. An information recording medium on which the acoustic data and non-acoustic data are recorded by the information recording and transmitting method according to any one of claims 1, 2, 3, or 4. 6. An information recording and transmitting device that simultaneously transmits an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to the non-acoustic data, a blocking means for adding a synchronization pattern to each predetermined bit of audio data to form a non-acoustic data block; level detection means for detecting at least one of the following points in time and outputting a replacement start signal; 1. An information recording and transmitting apparatus, comprising: substituting means for substituting each of the lower K bits (K<N) of the audio data with a non-acoustic data block. 7. The information recording and transmitting apparatus according to claim 6, wherein the non-acoustic data block has a fixed length. 8. An information recording and transmitting device that simultaneously transmits an audio data string consisting of audio data with a quantization bit number of N bits and a non-acoustic data block in which a synchronization pattern is added to non-acoustic data, blocking means for adding a synchronization pattern to each predetermined bit of audio data to form a non-acoustic data block; level detection means for detecting at least one point in time when the sound data is equal to or less than a specified value; delay means for delaying the acoustic data given to the level detection means by a predetermined time; The non-acoustic data block obtained from the delay means is divided into K bits, and the lower K bits (K<
1. An information recording and transmitting apparatus, comprising: replacing means for replacing each of N) with a non-acoustic data block. 9. The information recording and transmitting apparatus according to any one of claims 6, 7, and 8, wherein the level detecting means replaces the compared value with the value of the audio data and converts it into an envelope signal of the audio data. An information recording and transmitting device characterized by: 10. An information reproducing device for reproducing a signal recorded or transmitted by replacing an acoustic data string and a non-acoustic data string consisting of N-bit acoustic data, wherein an input signal is given and N-bit digital data is reproduced. an input processing means for outputting the input processing means; a separation determination means for monitoring lower predetermined bits of the digital data obtained from the input processing means and outputting a separation command when a synchronization pattern is detected; and a separation judgment means for outputting a separation command according to the separation command; An information reproducing apparatus comprising: separating means for separating upper predetermined bits of N-bit digital data reproduced by the means as audio data and lower predetermined bits as non-acoustic data. 11. The information reproducing apparatus according to claim 10, wherein said separation determining means provides a fixed time separation signal to said separating means after a synchronization pattern is detected.