JP2001083993A - Method for transmitting music data information and device for transmitting music data information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for transmitting music data information capable of performing a music regeneration or recording accumulation according to a transferred music data by transferring original music sampling frequency information as additional information together with transfer sampling frequency information. SOLUTION: An original fs signal is supplied to an over sampling means 1103, and original fs information is supplied to a system control part 1007. The data subjected to over sampling processing in the over sampling means 1003 is subjected to band limitation so as to have a desired band by an LPF 1004, and set to a desired sampling frequency by a re-sampling means 1005 to take out a transfer fs signal. The system control part 1007 supplies desired parameters 1008, 1009 for fs conversion to the LPF 1004 and the re-sampling means 1005. The transfer fs signal and the transfer fs signal supplied by the system control part 1007, and the original fs information are inputted to an IEC 958 and an output means 1006.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for digitally transmitting music information and music data.

[0002]

2. Description of the Related Art Conventionally, digital transmission of music information and music data in the form of a serial signal is carried out by IEC.
There are international standards such as 958 and IEEE1394.

[0003] IEC958 is a method used for transmitting 2-channel linear PCM data, and is a CD (compact).
Discs) and DVDs (digital versatile discs) are widely used for digital data transmission. Information on the sampling frequency is transmitted using the channel status. FIG. 7 is an explanatory diagram of the IEC958 channel status. The information of the sampling frequency is transmitted as 4-bit information using 8 bits to 11 bits following the channel number as shown in FIG. In the related art, the sampling frequency for receiving and reproducing is the same as the sampling frequency for transmission, and is simply referred to as the sampling frequency. In the present invention, the conventional sampling frequency information is considered to represent the sampling frequency related to the transmission rate, and is hereinafter referred to as transmission fs information. Accordingly, the conventional sampling frequency is called transmission fs. Table 1 shows a conventional transmission fs information and a table of transmission fs. These are defined by the current IEC standard.

[0004]

[Table 1]

[0005] IEEE 1394 is a system used for digital video and the like, and is expected to be widely used for transmission of audio and video signals in the future. As in IEC958, in IEEE1394, the sampling frequency is FDF (Format Dependent F
ield) in the header data. (Table 2) shows the conventional transmission f in IEEE1394.
5 shows a table of s information (SFC) and transmission fs (kHz).

[0006]

[Table 2]

[0007]

The conventional music information and music data transmission method described above aims at simply reproducing the transmitted music data.
In D, etc., the sampling frequency is 96 kHz or up to 19
A frequency of 2 kHz has been adopted as a standard, and MPEG4
AAC (Advanced Audio Coding) considered for the application of
In such a compression method, introduction of a low sampling frequency such as 8 kHz or 12 kHz is planned, and it is not enough to simply reproduce the transmitted data.

FIG. 1 shows an example of device connection for data transmission. In FIG. 1, reference numeral 10 denotes a music data transmitting device for transmitting music data, 30 denotes a music data receiving device for receiving music data, and 20 denotes a music data transmission interface for transmitting music data.

Assuming that the music data transmitting device 10 is, for example, the latest DVD player and the music data receiving device 30 is a device conforming to the current standard, if the sampling frequency that cannot be handled by the current standard, the music data transmitting device 10
It is necessary to do some processing in. That is, it is necessary to convert the original music (for example, 192 kHz) on the DVD player side after converting it to 32 kHz, 44.1 kHz or 48 kHz defined by the current standard, and then transmitting the original music (for example, 192 kHz) on the DVD player side. And then converted to 48kHz and transmitted.

In this case, although the information of the sampling frequency (192 kHz) of the original music can be understood by the player performing the downsampling, since the information of the sampling frequency of the original music is not transmitted to the external device that receives the data, the information is not known. There was a first problem of disappearance. For this reason, even if a device with high performance and high sound quality is prepared for the device on the receiving side, the quality may be lower than the sound of 192 kHz / 24 bit / 2ch on the transmitting side. In addition to the down-sampling described above, there is a similar problem in the case of up-sampling and transmission, or in the case where 48 kHz is converted to 44.1 kHz by fs and transmitted.

In the case where the same data is repeatedly transmitted R times (R is an integer of 2 or more) in the future, which is not implemented at present, the receiving device thins out the data once every R times. There was a second problem that the information was not transmitted despite the necessity of doing it.

When music data is transmitted at a transmission rate of S times (real number of S> 1) or 1 / S times, data is stored in a storage medium at a rate different from a normal reproduction rate. This is generally called high-speed dubbing.
Although the sampling frequency is simply transmitted as information, the music data receiving device 30 has a third problem in that it is not possible to know from transmission data that processing should be performed at a different rate than usual.

As described above, in addition to the fs conversion, there is a possibility of an R-times repetition transmission mode in which the original fs signal is repeated R times and transmitted at an R-times rate, an S-times transmission mode, and the like. In such a case, it is considered important to know the original fs on the receiving side. However, in the conventional transmission, there is no information on the sampling frequency of the original music, and the music data receiving device 30 cannot know it. Was.

The present invention relates to a digital music transmission,
A music data information transmission method capable of performing music reproduction or recording / accumulation according to transmitted music data by simultaneously transmitting information relating to music data sampling. And the provision of equipment.

[0015]

According to a first aspect of the present invention, there is provided a data transmission information for transmitting music data and its additional information, the original data representing the sampling frequency of the original music of the music data. A music data information transmission method and apparatus characterized in that music sampling frequency information (hereinafter, referred to as original fs information) is transmitted and the sampling frequency of the original music of the music data transferred on the receiving side is known.

According to a second aspect of the present invention, there is provided a music data transmitting apparatus in which transmission mode information indicating which signal processing is performed on the transmission data is added to the music data signal. Music data information transmission method and apparatus, which ensures appropriate processing of music data.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method and an apparatus for transmitting music data in the case of using IEC958 and IEEE1394 transmission standards as embodiments of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1 shows a connection example of a consumer digital audio device used as a music data information transmitting apparatus of the present invention.

In FIG. 1, the music data transmission device 10 includes a DVD player, a set-top box and the like. The music data receiving device 30 includes an AV amplifier, a mini disk, a digital TV, and the like. The music data transmission interface 20 is IEC95
8 or an IEEE 1394 interface device.

First, a method and apparatus for transmitting music data information using IEC958 will be described.

FIG. 2 is a structural diagram of a channel status in which new information is added to the conventional IEC958 in order to transmit additional information used in the present invention.

In FIG. 2, 4 bits of original fs information (original music sampling frequency information) are allocated to 36 to 39 bits following the word length information. Of course, there is no unused portion in this position in the past. (Table 3) Original fs information and original fs
The contents (No. 1) of (kHz) are shown as a first example.

[0023]

[Table 3]

These have been devised so that they are assigned as much as possible in relation to the conventional transmission fs information. However, "000
0 "is 44.1 kHz in the transmission fs information, but the original f
The s information was not displayed. This is to hide the current device that does not send the original fs information since the current device conforming to the conventional standard is required to transmit “0” in the unused area. This avoids compatibility issues in interconnecting existing equipment with new equipment. 44.1 kHz is "100" which is not used for transmission fs information.
0 ". Other 32 kHz and 48 kHz were allocated to the same data position as the transmission fs information.
In Table 3, in addition to the sampling frequency newly added to DVDs and the like, sampling frequencies used in MPEG-AAC and the like, which are expected to need to be added in the future, are also assigned. As a result, from 8kHz to 1
Fs up to 92 kHz can be represented. This is 32k
It corresponds to 1/4 of Hz to 4 times of 48 kHz.

[0025]

[Table 4]

Table 2 shows the second example of the original fs information and the contents (No. 2) of the original fs (kHz).
In Table 4, similarly to Table 3, negative logic of the conventional transmission fs information is adopted in order to hide “0000”. That is, 44.1 kHz is "1111" at 4 / "0000" and 4
8 kHz is "1011" at / "0100". Others are similarly devised so as to have the same definition as the transmission fs information by expressing the negative logic. On the other hand, since the additional definition of fs is also useful in transmission fs information, a method of additionally defining new transmission fs information is shown in (Table 5). In Table 5, 44.1 kHz
Except for the non-display, it is the same as the assignment of the original fs information.

[0027]

[Table 5]

Further, in FIG. 2, transmission mode information is allocated to 30 to 31 bits by 2 bits. This position is also an unused area in the conventional standard. The contents of the transmission mode information are shown in (Table 6).

[0029]

[Table 6]

In Table 6, "00" is assigned to a real-time transmission mode indicating conventional transmission in order to maintain compatibility with the conventional standard. Hereinafter, "01" is the fs conversion transmission mode, "10" is the R-times transmission mode and "1"
1 "is the S-speed transmission mode.

Next, a description will be given of a music data information transmission method and apparatus using IEEE1394.

In the case of IEEE 1394, a new sampling frequency is defined for the transmission fs information and the original fs information in consideration of compatibility with the conventional standard as in IEC958.

[0033]

[Table 7]

[0034]

[Table 8]

[0035]

[Table 9]

Table 7 shows transmission fs information and transmission fs (kHz) newly added to the conventional SFC. Table 8 shows original fs information and original fs (kHz) which are newly added. FIG. Table 9 shows newly added S-speed information, transmission fs information, and transmission fs (kHz).
FIG. The original fs information and S double speed information are newly transmitted by extending the ancillary data. Therefore, conventionally, the information does not exist, and therefore, it can be freely assigned. However, the consistency with the transmission fs information is maintained as much as possible. Since the SFC alone does not sufficiently expand the transmission fs information, the S double speed information is defined by adding ancillary data. IEEE 1394 is a high-speed interface, has sufficient expandability, and enables a wide range of definitions.

[0037]

[Table 10]

Table 10 shows the contents of the IEEE 1394 transmission mode information. In Table 10, FD
The N flag of F is a flag indicating whether it is real-time or non-real-time. The relationship with the transmission mode information newly defined in the ancillary is as shown in (Table 10). IEC
Like "958", "00" is assigned to the real-time transmission mode indicating the conventional transmission in order to maintain compatibility with the conventional standard. Hereinafter, “01” is the fs conversion transmission mode, “10”
Is set to the transmission mode repeated R times and "11" is set to the S double speed transmission mode.

FIG. 3 is a block diagram showing an example of the configuration of the music data transmitting apparatus 10 when implementing an output device in the fs conversion transmission mode.

In the figure, reference numeral 1001 denotes an input terminal for inputting an original fs signal and a signal including original fs information. Reference numeral 1002 denotes an input unit. Here, the original fs signal and the original fs information are respectively extracted. The original fs signal is supplied to the oversampling unit 1003, and the original fs information is supplied to the system control unit 1007.

The data oversampled by the oversampling means 1003 is band-limited to a desired band by an LPF (low-pass filter) 1004, and the resampling means 1005 takes out a transmission fs signal at a desired sampling frequency. . The system control unit 1007 converts desired parameters 1008 and 1009 for fs conversion into LPFs.
1004 and resampling means 1005. Transmission f
The transmission fs information, the original fs information, and the transmission mode information supplied by the s signal and the system control unit 1007 are IE
The signal is input to the C958 output unit 1006 and is converted into the format of IEC958, and a signal is supplied from the IEC958 output unit 1006 to the music data transmission interface 20.

The original fs is obtained by the resampling unit 1005.
Is 1 / n (real number of n> 1), downsampling is performed, and if n times, upsampling is performed. In addition, it is possible to convert even a close frequency, and is generally referred to as fs conversion. In the LPF 1004, a parameter that is a cutoff frequency that is lower than the Nyquist frequency that has a lower fs at least before and after the fs conversion is set from the system control unit 1007. This is to remove aliasing distortion.

FIG. 4 is a block diagram showing an example of a configuration in which the music data transmitting apparatus 10 realizes an output device in the R-times repetition transmission mode.

In the figure, the same means as in FIG. 3 are denoted by the same reference numerals, and the description is omitted. The original fs signal is a repeater
In 1024, data is repeated according to the R parameter 1028 from the system control unit 1007. A transmission fs signal whose transmission rate is R times (R is an integer of 2 or more), transmission fs information,
The original fs information and transmission mode information are IEC9
The IEC958 output unit 1006 supplies a signal to the music data transmission interface 20 in the format of IEC958.

FIG. 5 is a block diagram showing an example of the configuration of the music data transmitting apparatus 10 when implementing an output device in the S-times transmission mode.

Similarly, in this figure, means similar to those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted. The input terminal 1001 is supplied with time scaling by a memory means (not shown), that is, an S double speed signal (real number of S> 1) compressed and expanded on the time axis.
It is. The original original fs information is extracted and supplied to the system control unit 1007. S fs signal is transmitted as it is fs
The signal is supplied to the IEC958 output means 1006 as a signal. The transmission fs information, the original fs information, and the transmission mode information are added, and a signal is supplied from the IEC958 output unit 1006 to the music data transmission interface 20.

As described above, signals are supplied from the respective output devices to the music data transmission interface 20 in various transmission modes.

It is needless to say that at least one or more functions of the configuration shown in FIGS.

FIG. 6 shows an example of the configuration of the music data receiving apparatus 30. Here, it is a block diagram showing the configuration of the receiving apparatus in the R-times repetition transmission mode.

In the figure, reference numeral 3001 denotes a terminal for receiving and inputting a signal of the music data transmission interface 20. This receiver is dedicated to specialized data for the purpose of explanation. What is transmitted by the music data transmission interface 20 is a transmission signal repeated four times with fs of 12 kHz.
The original fs information is “1011” (12 kHz), and the transmission fs information is “0100” (48 kHz). Transmission fs
Is 48 kHz, so the clock recovery PLL 3002
It can capture and lock to Hz. In the data strobe 3003, the input signal is converted to a clock recovery PLL.
Strobe with the clock recovered in 3002 to extract biphase mark data.

The IEC958 decoder means 3004 decodes and extracts a transmission fs signal, transmission fs information, original fs information and transmission mode information, respectively. The system control unit 3007 supplies a decimation parameter 3028 to the decimation unit 3005 based on the information. Transmission fs
It is set so as to thin out to 1/4 from the relationship between the information and the original fs information. The transmission fs signal of 48 kHz is taken out as data which is decimated to 1/4 by the decimation means 3005 and output as the original fs signal of 12 kHz.
Supply to 6. The signal is extracted from the output terminal 40 as an original fs signal.

On the other hand, the coincidence detecting means 3009 detects coincidence between the transmission mode information and the original fs information and supplies the system controller 3007 with the judgment result. System control unit 3007
Displays transmission fs information and / or original fs information and / or transmission mode information on a display means (not shown). Also, the result of the match detection means 3009 is displayed or
Tell the operator by alarm sound. As a result, even if the transmission mode information is missing, it is possible to display from the result of the coincidence detecting means 3009 that the transmission fs information is different from the original fs information, and to the operator for performing necessary receiving-side processing. Can be displayed. Of course, it is useful even for a standard or system that does not use transmission mode information at all.

Reference numeral 3009 denotes a coincidence detecting unit for comparing the transmission fs information with the original fs information. In this example, mismatch output data is obtained. Since the transmission mode information is a transmission mode repeated "10" R times, they are matched. If there is an error in the transmission data for any reason, the match detection means 3009
May not coincide with the transmission mode information. In this case, it is convenient to preferentially employ the information of the coincidence detecting means 3009 since the reliability is high. When the original fs information is not displayed, the coincidence detecting means 3009 always obtains the same judgment output as the coincidence.

Thus, the original 12 kHz fs
Since the signal can be decoded by sharing the clock reproduction PLL 3002 for 48 kHz, it is not necessary to provide a PLL dedicated to 12 kHz, or it is not necessary to provide an extremely wide capture range. The capture range can greatly contribute to higher performance and higher stability, such as improvement in jitter performance and improvement in pseudo lock avoidance performance.

Although FIG. 6 shows the receiver in the R repetition transmission mode, it is described in the other modes (fs conversion mode and S double speed transmission mode) by providing the reverse processing on the transmission side. Needless to say, it may be implemented with a plurality of functions so as to correspond to various modes.

In the above description, a block diagram has been described as an apparatus. However, these means can be realized as steps of software using resources such as a computer and a DSP (digital signal processor). Needless to say.

In the embodiment of the present invention, IEC9
As described above, the logical system is IEEE.
The same applies to 1394, and the same operation and effect can be exerted. In addition, the present invention produces effects in all applicable interfaces such as USB (Universal Serial Bus) and USB2 which is an extended standard thereof.

[0058]

As described above, according to the present invention, the music data transmitter transmits original music sampling frequency information and transmission fs information to the music data to be transmitted. Information can be known and displayed at the receiving device, and appropriate processing of reproduction or recording and accumulation can be automatically performed. The transmission mode information can convey the details of the processing in more detail. In addition, the R-time repetition transmission is economically excellent, for example, a common PLL and high performance can be realized in the receiving device. At the same time, it is suitable for multimedia transmission on a network or a PC (personal computer).

[Brief description of the drawings]

FIG. 1 is a block diagram showing a device connection example of a music data information transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of original fs information and transmission mode information in IEC958 channel status.

FIG. 3 is a block diagram showing an example of a configuration for realizing an output device in an fs conversion transmission mode as a transmission side of the music data information transmission device according to the embodiment of the present invention;

FIG. 4 is a block diagram showing an example of a configuration when an output device in an R-times repetition transmission mode is realized as a transmission side of the music data information transmission device.

FIG. 5 is a block diagram showing an example of a configuration for realizing an output device in an S-times transmission mode as a transmission side of the music data information transmission device.

FIG. 6 is a block diagram showing an example of a configuration for realizing a receiving apparatus in an R-times repetition transmission mode as a receiving side of the music data information transmitting apparatus.

FIG. 7 is a diagram showing the structure of a conventional IEC958 channel status.

[Explanation of symbols]

 Reference Signs List 10 music data transmission device 20 music data transmission interface 30 music data receiving device

Claims (30)

[Claims] 1. In data information transmission for transmitting music data and its additional information, music data transmitting original music sampling frequency information representing a sampling frequency of original music data as additional information together with transmission sampling frequency information relating to a transmission rate. Information transmission device. 2. At least 88.2 kHz, 96 kHz, 1
2. The music data information transmitting apparatus according to claim 1, wherein the transmitting apparatus transmits any one of the transmission sampling frequency information of 76.4 kHz and 192 kHz. 3. at least 8 kHz, 11.025 kHz,
2. The music data information transmitting apparatus according to claim 1, wherein any one of the transmission sampling frequency information of 12 kHz, 16 kHz, 22.05 kHz, and 24 kHz is transmitted. 4. The music data information transmission device according to claim 1, wherein transmission music frequency information indicating at least non-display is transmitted. 5. At least 88.2 kHz, 96 kHz, 1
2. The music data information transmitting apparatus according to claim 1, wherein one of the original music sampling frequency information of 76.4 kHz and 192 kHz is transmitted. 6. at least 8 kHz, 11.025 kHz,
2. The music data information transmitting apparatus according to claim 1, wherein any one of 12 kHz, 16 kHz, 22.05 kHz and 24 kHz original music sampling frequency information is transmitted. 7. The music data information transmitting apparatus according to claim 1, wherein the original music sampling frequency information indicating at least non-display is transmitted. 8. The music data information transmitting apparatus according to claim 1, wherein when the original music sampling frequency is equal to the transmission sampling frequency, the original music sampling frequency information has the same content as the transmission sampling frequency information. . 9. The transmission of music data information according to claim 1, wherein when the original music sampling frequency is equal to the transmission sampling frequency, the original music sampling frequency information indicates that the information is not displayed. apparatus. 10. When the original music sampling frequency is different from the transmission sampling frequency due to up-sampling, down-sampling, or sampling frequency conversion, the original music sampling frequency information is different from the transmission sampling frequency information. The music data information transmission device according to claim 1. 11. To increase the apparent transmission rate, R
When the original music sampling frequency is different from the transmission sampling frequency by performing the transmission by repeating (an integer of 2 or more) times, the original music sampling frequency information has a different content from the transmission sampling frequency information. The music data information transmission device according to claim 1. 12. The time axis is arbitrarily S times (S> 0 real number)
If the original music sampling frequency is different from the transmission sampling frequency by transmitting at a low speed or a high speed after being expanded or compressed by 1 / S times, the original music sampling frequency information should be different from the transmission sampling frequency information. The music data information transmission device according to claim 1, wherein 13. The music data information transmission apparatus according to claim 1, wherein the transmission is performed by adding transmission mode information indicating whether at least the original music sampling frequency information is different from the transmission sampling frequency information. . 14. In data information transmission for transmitting music data and its additional information, one of them is based on transmission sampling frequency information related to a received transmission rate and original music sampling frequency information indicating a sampling frequency of original music data. Alternatively, a receiving device for transmitting music data information, comprising a display means for displaying both. 15. In data data transmission for transmitting music data and its additional information, coincidence for comparing transmission sampling frequency information relating to a received transmission rate with original music sampling frequency information representing a sampling frequency of original music data. A receiving apparatus for music data information transmission, comprising: detecting means; and control means for performing mute, recording pause, alarm display, or display for prompting a next selection operation based on an output of the coincidence detecting means. 16. In data information transmission for transmitting music data and its additional information, transmission music sampling frequency information relating to a received transmission rate is different from original music sampling frequency information representing a sampling frequency of original music data. Transmission mode information detecting means for detecting whether or not transmission mode information indicating whether or not, and control means for performing a mute or a recording pause, an alarm display, or a display for prompting a next selection operation based on an output of the transmission mode information detecting means. A receiving device for transmitting music data information, comprising: 17. In data information transmission for transmitting music data and its additional information, coincidence for comparing transmission sampling frequency information relating to a received transmission rate with original music sampling frequency information representing a sampling frequency of original music data. Detecting means and control means for controlling by adopting the information of the match detecting means as a priority condition as exceptional processing when detecting that the transmission mode information matches even if the result is different. A receiving device for transmitting music data information, comprising: 18. In a data information transmission for transmitting music data and additional information thereof, music data transmitting original sampling frequency information representing a sampling frequency of original music data as additional information together with transmission sampling frequency information relating to a transmission rate. Information transmission method. 19. At least 88.2 kHz, 96 kHz,
The transmission sampling frequency information of any one of 176.4 kHz and 192 kHz is transmitted.
8. The method for transmitting music data information according to item 8. 20. at least 8 kHz, 11.025 kHz
19. The music data information transmission method according to claim 18, wherein any one of transmission sampling frequency information of z, 12 kHz, 16 kHz, 22.05 kHz, and 24 kHz is transmitted. 21. The music data information transmission method according to claim 18, wherein transmission sampling frequency information indicating at least non-display is transmitted. 22. at least 88.2 kHz, 96 kHz,
19. The music data information transmission method according to claim 18, wherein any one of 176.4 kHz and 192 kHz original music sampling frequency information is transmitted. 23. At least 8 kHz, 11.025 kHz
19. The music data information transmitting method according to claim 18, wherein any one of z, 12 kHz, 16 kHz, 22.05 kHz, and 24 kHz is transmitted. 24. The music data information transmission method according to claim 18, wherein at least original music sampling frequency information indicating non-display is transmitted. 25. The music data information transmission method according to claim 18, wherein when the original music sampling frequency is equal to the transmission sampling frequency, the original music sampling frequency information has the same content as the transmission sampling frequency information. . 26. The music data information transmission according to claim 18, wherein when the original music sampling frequency is equal to the transmission sampling frequency, the original music sampling frequency information has a content indicating that it is not displayed. Method. 27. When the original music sampling frequency is different from the transmission sampling frequency due to upsampling, downsampling, sampling frequency conversion, or the like, the original music sampling frequency information is different from the transmission sampling frequency information. 19. The music data information transmission method according to claim 18, wherein: 28. To increase the apparent transmission rate, R
When the original music sampling frequency and the transmission sampling frequency are different from each other by performing the transmission by repeating (an integer of 2 or more) times, the original music sampling frequency information is different from the transmission sampling frequency information. 19. The music data information transmission method according to claim 18, wherein: 29. The time axis is arbitrarily S times (S> 0 real number)
If the original music sampling frequency is different from the transmission sampling frequency by transmitting at a low speed or a high speed after being expanded or compressed by 1 / S times, the original music sampling frequency information should be different from the transmission sampling frequency information. 19. The music data information transmission method according to claim 18, wherein: 30. The music data information transmission method according to claim 18, wherein transmission is performed by adding transmission mode information indicating whether at least the original music sampling frequency information is different from the transmission sampling frequency information. .