JP3365331B2 - Vector quantization apparatus and vector quantization method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vector quantizing device and a vector quantizing method, and in particular, it is possible to embed watermark information in an encoded bit string when encoding a digital signal such as voice or image. The present invention relates to a vector quantization device and a vector quantization method.

2. Description of the Related Art As a conventional vector quantizer, watermark information is embedded in a designated bit of a 5-bit index by embedding position designating information in a digital code string composed of vector-quantized indexes, and a fixed index is provided. There is proposed a method of selecting a quantized vector having the minimum distortion with respect to an input vector and outputting the index value thereof (Japanese Patent Laid-Open No. 10-224).
342 publication).

[0002]

In this case, since the embedding position is fixed, the data and watermark information obtained by encoding with the watermark information embedded in the same input signal sequence of finite length. There is a problem that the place where the watermark information is embedded is specified from the difference data by comparing the data obtained by encoding without embedding. Also, since the watermark information embedding position is not determined in consideration of the signal at the time of reproduction, the influence of the embedded watermark information is over the entire signal at the time of reproduction, and the watermark information embedding position In some cases, there is a problem that the user can easily recognize the deterioration of the reproduced signal. Therefore, an object of the present invention is to make it difficult to easily specify the embedding position of the watermark data, to enable the user to accurately grasp the unauthorized use of the information after vector quantization, and for the user to recognize the watermark information. An object of the present invention is to provide a vector quantizing device and a vector quantizing method capable of preventing deterioration of a reproduced signal due to addition from being easily grasped.

[0003]

In order to solve the above-mentioned problems, the structure according to claim 1 is a vector quantizer for vector-quantizing input signal data, wherein time-axis / frequency-axis conversion of the input signal data and The frequency axis waveform cutout data obtained by performing the waveform cutout is vector-quantized and has index generation means for generating index data, wherein the index generation means adds watermark information data to the index data. In doing so, it is characterized by comprising watermark information adding means for adding the watermark information data to the index data for the frequency axis waveform cutout data corresponding to the frequency band component on the higher frequency side than the predetermined frequency. .

According to a second aspect of the present invention, in the configuration of the first aspect, the index generating means is stored in a plurality of codebook means for storing the index data in advance and the corresponding codebook means. A plurality of encoding means for allocating the index data to the frequency axis waveform cutout data, wherein the encoding means corresponding to a frequency band component on a higher frequency side than a predetermined frequency is the codebook means. When allocating the index data using, the index data stored in the codebook means is randomly selected to be within a predetermined error range with respect to the original waveform cutout data when decoded. It is characterized by doing.

According to a third aspect of the present invention, in the configuration of the first aspect, the index generating means is stored in a plurality of codebook means for storing the index data in advance and the corresponding codebook means. A plurality of encoding means for allocating the index data to the frequency axis waveform cutout data, and when there are a plurality of the encoding means corresponding to a frequency band component on a higher frequency side than a predetermined frequency, At least one encoding means selected at random from the encoding means, when allocating the index data using the codebook means, when decoding from the index data stored in the codebook means Run the index data within the specified error range with respect to the original waveform cutout data. It is characterized by selecting the beam.

According to a fourth aspect of the present invention, in the vector quantizer for vector-quantizing the input signal data, the frequency axis waveform cutting obtained by performing the time axis / frequency axis conversion and the waveform cutting of the input signal data. When adding the watermark information data to the output data, the frequency axis waveform cutout data including a large number of frequency band components on the higher frequency side predetermined based on the frequency band components included in each frequency axis waveform cutout data is added to the frequency axis waveform cutout data. It is characterized in that a watermark information adding unit for adding watermark information data is provided.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the time axis / frequency axis conversion of the input signal data is performed to output the frequency axis input signal data.
The frequency axis conversion means and the frequency axis input signal data are interleaved to generate interleaved frequency axis input signal data, and the interleaved frequency axis input signal data is subjected to waveform cutting to obtain frequency axis waveform cutout data. It is characterized in that it is provided with an interleave / waveform cutting means for outputting.

According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, the input signal data is audio data, and the predetermined frequency is a human hearing characteristic. It is characterized in that it is determined as a frequency that has little effect on the hearing.

According to a seventh aspect of the present invention, in the vector quantization method for vector-quantizing an input signal, frequency axis waveform cutout data obtained by performing time axis / frequency axis conversion and waveform cutout of the input signal. A vector quantization is performed to generate index data, and the index generation step adds the watermark information data to the index data, and the frequency band is higher than a predetermined frequency band. It is characterized by comprising a watermark information adding step of adding the watermark information data to the index data for the frequency axis waveform cutout data corresponding to a component.

According to the structure of claim 8, in a vector quantization method for vector quantizing an input signal, frequency axis waveform cutout data obtained by performing time axis / frequency axis conversion and waveform cutout of the input signal. When adding watermark information data to the frequency axis waveform cutout data containing a large number of frequency band components on the higher frequency side that are predetermined based on the frequency band components included in each frequency axis waveform cutout data, the watermark information It is characterized by including a watermark information adding step of adding data.

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described with reference to the drawings. [1] First Embodiment [1.1] Configuration of Vector Quantization Device FIG. 1 shows a schematic configuration block diagram of the vector quantization device. The vector quantizer 10 cuts the waveform of the input signal data DIN and outputs it as the cut-out waveform data DP, and the time-axis / frequency-axis conversion of the cut-out waveform data DP to cut the frequency axis. A frequency conversion device 12 that outputs the output waveform data DPF and an index generation unit 13 that generates an index based on the frequency axis cut-out waveform data DP and outputs the bitstream data DBS are configured.

FIG. 2 is a detailed block diagram of the index generator 13. In this case, the index generator 13
Represents the frequency axis cut-out waveform data DPF in six frequency bands (frequency bands L1, L2 from the low band side to the high band side,
M1, M2, H1, and H2) are classified and processed. In this case, the boundary between the frequency band L2 and the frequency band M1 has, for example, a sampling frequency of 44.1.
In the case of [kHz], it is set to about 7 [kHz], and the boundary between the frequency band M2 and the frequency band H1 is set to about 14 [kHz]. Note that this is merely an example, and can be appropriately changed based on human perception characteristics or design concept.
The index generating unit 13 vector-quantizes the frequency axis cutout waveform data DPFL1 which is the frequency axis cutout waveform data DPF belonging to the frequency band L1 which is the lowest frequency band, and outputs the first low band index data DPIDL1. A first low-frequency vector quantizer 15 and vector quantization of the frequency-axis cut-out waveform data DPFL2 which is the frequency-axis cut-out waveform data DPF belonging to the frequency band L2, and outputs the second low-frequency index data DPIDL2. 2 low-frequency vector quantizer 16 and vector quantization of frequency-axis cut-out waveform data DPFM1 which is frequency-axis cut-out waveform data DPF belonging to frequency band M1 to perform first mid-range index data DPI
The first mid-range vector quantizer 17 that outputs DM1 and vector quantize the frequency-axis cut-out waveform data DPFM2 that is the frequency-axis cut-out waveform data DPF belonging to the frequency band M2, and then perform the second mid-range index data DPIDM2. And a vector quantization of the frequency axis cut-out waveform data DPFH1 which is the frequency axis cut-out waveform data DPF belonging to the frequency band H1 (for example, 10 kHz or more). A first high frequency vector quantizer 19 that outputs high frequency index data DPIDH1, and vector quantization of frequency axis cut waveform data DPFH2 that is frequency axis cut waveform data DPF that belongs to frequency band H2 that is the highest frequency band. The second high frequency index data DPI
And a second high-frequency vector quantizer 20 that outputs DH2.

Further, the index generating unit 13 includes an embedding position information storage unit 21 for storing embedding position data DFP of watermark information, a random number generating unit 22 for generating and outputting random number data DRN, and watermark information data DWM in advance. And a watermark information storage unit 23 for storing, and watermark information data DWM is added to the input first high band index data DPIDH1 and output as first watermark added high band index data DPWM1 or second high band index data. Watermark embedding unit 2 which adds watermark information data DWM to DPIDH2 and outputs it as second watermark-added high frequency index data DPWM2
4 and either the first high band vector quantizer 19 or the second high band vector quantizer 20.
4 and performs the selecting operation of the vector quantizer for outputting either the corresponding first watermark added high frequency index data DPWM1 or the second watermark added high frequency index data DPWM2 to the multiplexer 28 described later. At the same time, the vector quantization unit selection unit 25 that outputs the selection data DSEL and the switch units 26-1, 26-2, 27- that are turned on / off under the control of the vector quantization unit selection unit 25.
1, 27-2, first low band index data DPIDL1, second low band index data DPIDL2, first middle band index data DPIDM1, second middle band index data DPID
Bitstream data D based on M2, first high band index data DPIDH1, second high band index data DPIDH2, first watermark added high band index data DPWM1 and second watermark added high band index data DPWM2
And a multiplexer 28 that generates and outputs a BS.

[1.2] Operation Waveform Cutout Device 11 of Vector Quantizer Cuts the waveform of the input signal data DIN and outputs it to the frequency conversion device 12 as cutout waveform data DP. Frequency converter 12 Time axis / frequency axis conversion of the cut waveform data DP is performed to cut the frequency axis cut waveform data DPF.
Is output to the index generation unit 13. As a result, the first low-frequency vector quantizer 15 of the index generator 13
Is the frequency axis cutout waveform data D belonging to the frequency band L1.
The frequency axis cut-out waveform data DPFL1 which is PF is vector-quantized, and the first low frequency index data DPIDL1 is output to the multiplexer unit 28. Similarly, the second low-frequency vector quantizer 16 uses the frequency axis cut-out waveform data D that is the frequency axis cut-out waveform data DPF belonging to the frequency band L2.
The vector quantization of PFL2 is performed and the second low band index data DPIDL2 is output to the multiplexer unit 28. The first middle band vector quantization unit 17 determines the frequency axis which is the frequency axis cutout waveform data DPF belonging to the frequency band M1. The cutout waveform data DPFM1 is vector-quantized, and the first middle-range index data DPIDM1 is output to the multiplexer unit 28. The second middle-range vector quantization unit 18 causes the frequency axis cutout waveform data DPF belonging to the frequency band M2. Vector quantization of the frequency axis cut-out waveform data DPFM2, and outputs the second middle band index data DPIDM2 to the multiplexer unit 28, and the first high band vector quantization unit 19 sets the frequency band H1
Vector quantization of the frequency axis cut-out waveform data DPFH1 which is the frequency axis cut-out waveform data DPF belonging to, and outputs the first high-frequency index data DPIDH1 to the switch unit 26-1 and the second high-frequency vector quantization unit. 20 is the frequency band H2
Vector quantization is performed on the frequency axis cut-out waveform data DPFH2 which is the frequency axis cut-out waveform data DPF belonging to, and the second high band index data DPIDH2 is output to the switch unit 26-2.

Here, referring to FIG. 3A, the first low band vector quantizer 15 and the second low band vector quantizer 1
6, the configuration of the first mid-range vector quantizer 17, the second mid-range vector quantizer 18, the first high-range vector quantizer 19 and the second high-range vector quantizer 20 The conversion unit 15 will be described as an example. The first low band vector quantizer 15 uses the first low band index data DPI.
Codebook 51 that stores DL1 and Codebook 51
And an encoder 52 that encodes the frequency axis cut-out waveform data DPFL1 that is input based on the stored contents. On the other hand, the embedding position information storage unit 21 stores the embedding position data DFP of the stored watermark information in the watermark embedding unit 2
4, the random number generator 22 generates random number data DRN for randomly selecting the watermark information embedding position, and outputs the random number data DRN to the watermark embedding unit 24.
The stored watermark information data DWM is sequentially added to the watermark embedding unit 24.
Output to.

Then, the watermark embedding unit 24 specifies the embedding position by the embedding position data DFP and the random number data DRN,
Watermark information data DWM is added to the input first high-frequency index data DPIDH1 and output as the first watermark-added high-frequency index data DPWM1 to the multiplexer unit 28 via the switch unit 27-1 or the second high-frequency index data DPWM1. Watermark information data DWM is added to the area index data DPIDH2, and the second watermark added high area index data DPWM2 is added.
As the multiplexer unit 28 via the switch unit 27-2
Output to. As a result, the multiplexer 28 determines that the first low band index data DPIDL1, the second low band index data DPIDL2, and the first middle band index data DPID.
M1, second medium band index data DPIDM2, first high band index data DPIDH1, second high band index data DPIDH2, first watermark added high band index data DP
WM1 and second watermark added high frequency index data DPWM
The bit stream data DBS is generated and output based on 2, and the bit stream data DBS is transmitted via a transmission path (not shown).

The bit stream data will be described with reference to FIG. FIG. 4 is an explanatory diagram of the configuration of the bitstream data DBS. Bitstream data D
The BS is roughly composed of header information data DHD and vector index information data DVI. The header information data DHD corresponds to, for example, ID data DID having a value that does not overlap in the world with which the vector quantizer 10 can be specified, encoding method data DEM indicating an encoding method, and the bit stream data DBS. Title data DTI indicating a title to be displayed and m pieces of watermark position information data DWM indicating a position including the watermark information.
P1 to DWMPm, and is configured. In this case, the ID data DID is “GUID (Glov
al unique ID) ”or the like. Also, ID
The header information data DHD other than the data DID may be encrypted by a predetermined encryption method. The data included in the header information data DHD is not limited to these, and various data can be included as necessary.

[1.3] Vector Decoding Device Next, the vector decoding device will be described. [1.3.1] Configuration of Vector Decoding Device FIG. 5 shows a schematic configuration block diagram of the vector decoding device. The vector decoding device 30 converts the input bit stream data DBS (see FIG. 3) into the encoding method data DEM.
The frequency axis cut-out waveform data DPFL1, DPFL2, DPFM1, DPFM2, DPFH1, DPF are decoded by a decoding method corresponding to the coding method corresponding to the above or a predetermined decoding method.
Decoding unit 31 for outputting as H2 and frequency axis cut-out waveform data DPFL1, DPFL2, DPFM1, DPFM2, DPFH1, DPFH2
Of the time axis conversion device 32 that performs the frequency axis / time axis conversion and outputs as the time axis cutout waveform data DPT, and the frame generation that generates the frame based on the time axis cutout waveform data DPT and outputs the output signal data DOUT. Device 33,
Output watermark information data based on the watermark position information data DWMP (= any of the watermark position information data DWPM1 to DWPMn in the bitstream data DBS, or the watermark position information data input from an external watermark position information database not shown) And a watermark information decoding unit 34 that outputs DWMOUT.

The decoding unit 31 separates the bit stream data DBS into the first low band index data DPIDL.
1, the second low band index data DPIDL2, the first mid band index data DPIDM1, the second mid band index data DPIDM2, the first high band index data DPIDH1, the second high band index data DPIDH2, and the first high band index data DPIDH1. Instead of the first watermark-added high-frequency index data DPWM1 or the second high-frequency index data DPIDH2, the demultiplexer unit 35 that outputs the second watermark-added high-frequency index data DPWM2;
The first low-frequency vector decoding unit 36 that decodes the low-frequency index data DPIDL1 and outputs the frequency axis cut-out waveform data DPFL1 and the second low-frequency index data DPIDL2 that outputs the frequency axis cut-out waveform data DPFL2 Second
The low-frequency vector decoding unit 37 and the first middle-frequency index data DPIDM1 are decoded, and frequency axis cut-out waveform data DPFM
A first middle band vector decoding unit 38 that outputs 1, a second middle band vector decoding unit 39 that decodes the second middle band index data DPIDM2, and outputs frequency axis cut-out waveform data DPFM2, and a first high band vector decoding unit 39. First high band vector decoding unit 40 that decodes the high band index data DPIDH1 or the first watermark added high band index data DPWM1 and outputs the frequency axis cut-out waveform data DPFH1, and the second high band index data DPIDH2 or the second watermark Decode the additional high frequency index data DPWM2, and extract the frequency axis waveform data DPFH2
And a second high frequency vector decoding unit 41 which outputs

The watermark information decoding unit 34 does not necessarily have to be included in a device such as a decoding device used by general users that does not necessarily require watermark information.
Here, prior to the description of the vector decoding device, the structure of the bit stream data DBS ′ when the watermark position information data is input from the external watermark position information database will be described with reference to FIG. The bit stream data DBS 'is roughly classified into header information data D
It is composed of HD and vector index information data DVI. The header information data DHD is, for example,
The vector quantization device 10 is provided with ID data DID having a value that does not overlap in the world and watermark position storage information data DWMST indicating the storage position of the watermark information on the watermark position information database. There is.

Also in this case, "GUID (Gloval unique ID)" or the like is used as the ID data DID.
Further, the watermark position storage information data DWMST may be encrypted by a predetermined encryption method. The data included in the header information data DHD is not limited to these,
It is possible to include various data as needed. When the watermark position storage information data DWMST is passed to the watermark position information database side, the watermark position information database outputs the watermark position information data corresponding to the watermark position storage information data DWMST to the watermark information decoder 17 as the watermark position information data DWMP. Will be done. Therefore, the bit stream data DBS does not directly include the information regarding the position where the watermark information is embedded, so that the data security can be further ensured.

[1.3.2] Operation of Vector Decoding Device The demultiplexer unit 35 of the vector decoding device 30 is
The bit stream data DBS is separated into the first low band index data DPIDL1, the second low band index data DPIDL2, the first mid band index data DPIDM1, the second mid band index data DPIDM2, the first high band index data DPIDH1, and the The first high band index data DPIDH2 and the first high band index data DPIDH1 instead of the first
Watermarked high frequency index data DPWM1 or second
Instead of the high frequency index data DPIDH2, the second watermark added high frequency index data DPWM2 is output to the corresponding vector decoding units 36 to 41. The first low band vector decoding unit 36 uses the first low band index data DPIDL.
1 is decoded and the frequency axis cutout waveform data DPFL1 is output to the time axis converter 32.

Similarly, the second low-frequency vector decoding unit 37
The second low band index data DPIDL2 is decoded, the frequency axis cut-out waveform data DPFL2 is output to the time axis conversion device 32, the first middle band vector decoding unit 38 decodes the first middle band index data DPIDM1, The frequency-axis cut-out waveform data DPFM1 is output to the time-axis converter 32, and the second mid-range vector decoding unit 39 outputs the second mid-range index data DPI.
The DM2 is decoded, the frequency axis cut-out waveform data DPFM2 is output to the time axis converter 32, and the 1 high frequency vector decoding unit 40
And the first high frequency index data DPIDH1 or the first
Decode watermark added high frequency index data DPWM1,
The frequency axis cut-out waveform data DPFH1 is output to the time axis converter 32, and the second high frequency vector decoding unit 41 decodes the second high frequency index data DPIDH2 or the second watermark added high frequency index data DPWM2 to obtain the frequency axis. The cut-out waveform data DPFH2 is output to the time axis converter 32. The time axis converter 32 uses the frequency axis cut-out waveform data DPFL1, DPF.
The frequency axis / time axis conversion of L2, DPFM1, DPFM2, DPFH1, and DPFH2 is performed, and the time axis cutout waveform data DPT is output to the frame generator. The frame generator 33 generates a frame based on the time axis cut-out waveform data DPT and outputs it as output signal data DOUT.

As a result, the user can output the output signal data D
It is possible to play back images and sounds corresponding to OUT. On the other hand, the watermark information decoder 34 uses the watermark position information data DWMP (= any of the watermark position information data DWPM1 to DWPMn in the bit stream data DBS, or
Output watermark information data DWMOUT is output based on (watermark position information data input from an external watermark position information database (not shown)). Thus, if the copyright information is included as the output watermark information data DWMOUT, the source of the output signal data DOUT can be easily specified.

[1.4] Effects of the First Embodiment As described above, according to the first embodiment, since the watermark information data is added and embedded in the index data of the high frequency band, In particular, when the input signal data corresponds to an audio signal such as a voice signal or an acoustic signal, the watermark information data is embedded in a frequency band that has little influence on the human auditory perception characteristics, so that the listener's ears can hear it. It is less perceptible, and the effect on the effective sound quality can be reduced.

[1.5] Modification of First Embodiment [1.5.1] First Modification In the above description, in each vector quantizer, vector quantization is performed by the most basic configuration. However, when selecting the index data corresponding to the non-embedded position of the watermark information, not only the first candidate index data with the smallest error but also other index data belonging to a predetermined predetermined error range are randomly generated. If it is configured to randomly select, when the difference data is obtained by comparing the bitstream data generated without watermark information and the bitstream data generated with watermark information However, the difference data including information other than the watermark information is obtained, which makes it difficult to extract the watermark information and To malicious attacks such 竄 or erasing, it is possible to obtain a bit stream data including a stronger watermark information.

[1.5.2] Second Modification In the above description of the first modification, the case of embedding watermark information has been described. The first vector with the smallest error when selecting index information in the vector quantizer on the region side
If not only the candidate index data but also other index data belonging to a predetermined error range is randomly selected by a random number, a malicious attacker can generate bitstream data without including watermark information. Even if the difference data is obtained by comparing the watermarked data and the bitstream data generated by including the watermark information, the difference data including the information other than the watermark information is obtained in the same manner. It is possible to make it difficult to extract information and obtain bitstream data that is resistant to falsification or deletion of watermark information.

[1.5.3] Third Modification In the first modification, the selection of the index data corresponding to the non-embedding position of the watermark information has been described. For example, as shown in FIG. When performing vector quantization on the frequency axis cutout waveform data of the highest frequency band using the codebook CBH2, it belongs to not only the first candidate index data with the smallest error but also a predetermined error range. Other index data may be randomly selected by random numbers.

[1.5.4] Fourth Modification Also, one or more of the plurality of codebooks (codebooks CBH1, CBH2 in FIG. 6) corresponding to the frequency band on the high frequency side. Alternatively, the index data may be selected for only the selected codebook by using a random number or the like by the same method as in the third modification, and for the other, the first candidate index data with the smallest error may be selected. It is possible.

[2] Second Embodiment In the above first embodiment, no processing was performed on the frequency axis cutout waveform data DFP, but FIG.
Frequency axis cut-out waveform data DFP1 to DF as shown in (a)
When P4 is obtained (the numbers 1 to 24 in the figure represent subdivided frequency bands), the obtained frequency axis cutout waveform data DFPFP1 to DFP4 are interleaved, Among the interleaved frequency axis cut-out waveform data DFPFP1 'to DFP6' obtained as shown in 7 (b), the watermark information data is obtained for the interleaved frequency axis cut-out waveform data DFP6 'containing the most high frequency components. It is also possible to add the index data to obtain index data '(see FIG. 7C). As a result, even when interleaving is performed, by adding watermark information to index data that includes components from higher frequencies that have less influence, especially when the input signal data corresponds to a voice signal or an acoustic signal. In this case, the watermark information data is embedded in a frequency band that is less affected by human hearing characteristics, and is less likely to be perceived by the listener's ears, so that the effect on effective sound quality can be reduced.

[3] Modification of Embodiment [3.1] First Modification In the above description, the most basic vector quantizer was described as the vector quantizer, but the vector quantizer is multistage. The present invention can also be applied to a multi-stage vector quantization device that performs quantization and a conjugate vector quantization device that performs vector quantization by combining a plurality of index data. [3.2] Second Modification In the above description, the case where the input signal data is audio data has been mainly described, but it is based on not only human auditory characteristics but also human perceptual characteristics such as visual characteristics. The same effect can be obtained by adopting a configuration in which the watermark information is embedded in a frequency band in which the embedding of the watermark information is difficult to perceive.

[0031]

According to the present invention, since the watermark information is embedded in the frequency band in which the embedding of the watermark information is difficult to be perceived based on the human perceptual characteristics, the reproduction signal is deteriorated by the user when the watermark information is added. You can make it difficult to grasp. When embedding watermark information,
By embedding randomly or embedding information other than watermark information, it is not possible to easily specify the embedding position of the watermark information, and it is possible to accurately grasp the unauthorized use of the information after vector quantization. .

[Brief description of drawings]

FIG. 1 is a schematic configuration block diagram of a vector quantization device according to a first embodiment.

FIG. 2 is a detailed configuration block diagram of an index generation unit according to the first embodiment.

FIG. 3 is a schematic block diagram of a vector quantization unit and a vector coding unit.

FIG. 4 is a diagram illustrating the configuration of bitstream data.

FIG. 5 is a schematic configuration block diagram of a vector decoding device.

FIG. 6 is an explanatory diagram of a processing operation of the first embodiment.

FIG. 7 is a diagram illustrating the processing operation of the second embodiment.

[Explanation of symbols]

10 ... Vector quantizer, 11 ... Waveform cutting device, 12
... index generating unit, 15 ... first low band vector quantizing unit, 16 ... second low band vector quantizing unit, 17 ... first middle band vector quantizing unit, 18 ... second middle band vector quantizing unit,
19 ... 1st high-frequency vector quantization part, 20 ... 2nd high-frequency vector quantization part, 21 ... Embedding position information storage part, 22 ... Random number generation part, 23 ... Watermark information storage part, 24 ... Watermark embedding part , 25 ... Vector quantizer selection unit, 26-1, 26-2,
27-1, 27-2 ... Switch section, 28 ... Multiplexer section, 30 ... Vector decoding device, 31 ... Decoding section, 32
... time axis conversion device, 33 ... frame generation device, 34 ... watermark information decoding unit, 35 ... demultiplexer unit, 36 ...
First low band vector decoding unit, 37 ... Second low band vector decoding unit, 38 ... First middle band vector decoding unit, 39 ... Second
Middle band vector decoding unit, 40 ... First high band vector decoding unit, 41 ... Second high band vector decoding unit, 51 ... Codebook, 52 ... Encoder, 61 ... Codebook, 62 ... Decoder, DIN … Input signal data, DP… Waveform cutout data, DP
F ... Frequency axis waveform cutout data, DBS ... Bitstream data, DFP ... Watermark embedding position information data, DWM ... Watermark information data, DHD ... Header information data, DPIDL1 ... First low band index data, DPIDL2 ... Second low Range index data, DPIDM1 ... first middle range index data, DPIDM2 ... second middle range index data, DPIDH1 ...
First high frequency index data, DPIDH2 ... Second high frequency index data, DPFL1, DPFL2, DPFM1, DPFM2, D
PFH1, DPFH2 ... Frequency axis cut-out waveform data, DPWM1 ... 1st
Watermark added high frequency index data, DPWM2 ... Second watermark added high frequency index data

Continuation of front page (56) Reference JP-A-11-316599 (JP, A) JP-A-11-272299 (JP, A) JP-A-11-205153 (JP, A) JP-A-10-224342 (JP , A) JP-A-10-65912 (JP, A) JP-A-10-112657 (JP, A) JP-A-11-259068 (JP, A) JP-A-3-60529 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H03M 7/30 G09C 5/00 G10L 19/00

Claims (8)

(57) [Claims] 1. A vector quantizer for vector-quantizing input signal data, wherein vector quantization of frequency-axis waveform cut-out data obtained by performing time-axis / frequency-axis conversion and waveform cut-out of the input signal data. And an index generating unit for generating index data, the index generating unit corresponding to a frequency band component on a higher frequency side than a predetermined frequency when adding watermark information data to the index data. A vector quantization device comprising watermark information adding means for adding the watermark information data to the index data for the frequency axis waveform cutout data. 2. The vector quantization device according to claim 1, wherein the index generation means stores a plurality of codebook means for storing the index data in advance, and the index data stored in the corresponding codebook means. A plurality of encoding means for allocating to the frequency axis waveform cutout data, wherein the encoding means corresponding to a frequency band component on a higher frequency side than a predetermined frequency is When allocating the index data, it is possible to randomly select index data that is within a predetermined error range with respect to the original waveform cutout data when decoded from the index data stored in the codebook means. Characteristic vector quantizer. 3. The vector quantization device according to claim 1, wherein the index generating means stores a plurality of codebook means for storing the index data in advance, and the index data stored in the corresponding codebook means. A plurality of encoding means for allocating to the frequency axis waveform cut-out data, and when there are a plurality of the encoding means corresponding to the frequency band component on the higher frequency side than the predetermined frequency, the encoding means At least one encoding means selected at random among the index data stored in the codebook means when the index data is assigned using the codebook means Randomly select index data that is within a predetermined error range for waveform cutout data A vector quantizer characterized by: 4. A vector quantizer for vector-quantizing input signal data, wherein watermark information is included in frequency-axis waveform cut-out data obtained by performing time-axis / frequency-axis conversion and waveform cut-out of the input signal data. When adding data, the watermark information data is added to the frequency axis waveform cutout data that includes a large number of frequency band components on the higher frequency side that are predetermined based on the frequency band components included in each frequency axis waveform cutout data. A vector quantization device comprising watermark information adding means. 5. The vector quantization apparatus according to claim 4, wherein the time axis / frequency axis conversion means performs time axis / frequency axis conversion of the input signal data and outputs frequency axis input signal data, and the frequency axis. Interleaving / waveform cutting means for outputting frequency axis waveform cutout data by interleaving input signal data to generate interleaved frequency axis input signal data, and performing waveform cutout of the interleaved frequency axis input signal data. A vector quantizer, which is provided. 6. The vector quantizing device according to claim 1, wherein the input signal data is audio data, and the predetermined frequency is audible based on human audible characteristics. A vector quantizer characterized by being defined as a frequency with little influence on the above. 7. A vector quantization method for vector quantizing an input signal, wherein vector quantization of frequency axis waveform cutout data obtained by performing time-axis / frequency-axis conversion and waveform cutout of the input signal is performed. And an index generating step of generating index data, wherein the index generating step adds the watermark information data to the index data, the frequency corresponding to a frequency band component on a higher frequency side than a predetermined frequency. A vector quantization method comprising a watermark information adding step of adding the watermark information data to the index data for axial waveform cutout data. 8. A vector quantization method device for vector-quantizing an input signal, wherein watermark information data for frequency-axis waveform cut-out data obtained by performing time-axis / frequency-axis conversion and waveform cut-out of the input signal. When adding, a watermark for adding the watermark information data to the frequency axis waveform cutout data containing a large number of frequency band components on the higher frequency side that are predetermined based on the frequency band components included in each frequency axis waveform cutout data. A vector quantization method comprising an information adding step.