JP2003264898A - Broadband theater system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system wherein the dangers of leakage of contents of a storage device and copying of the contents are wiped out in a process of contents distribution and a building block configuration of hardware can protect loss of data copy protection due to remolding of software or the like. <P>SOLUTION: Introducing a delay controller to the system in place of a storage device with a large capacity not needed by broadband brought into the system to realize protective functions, can eliminate a bottle neck of a home theater achieving widespread use and prevent illegitimate leakage of contents. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Broadband network, computer, audio, wireless LAN, home theater

2. Description of the Related Art Due to the wide band and high speed of communication,
The data stream containing the contents such as voice can now be easily captured by ordinary households. On the other hand, the demand for legal protection of content copyrights has become strict every day,
The reality is that the technical measures to make both sides compatible have not yet been realized. On the other hand, in order to obtain a stereoscopic sound effect indoors, it is a reliable method to arrange a plurality of speakers around the listener (listener) on the left and right and front and back. However, there are various problems in the system in which multiple speakers are arranged in the room. (A) In general, the output of an amplifier that drives these plural speakers together becomes enormous. At least 30W to drive one low efficiency high performance speaker
The above output is required, and in order to drive 6ch (6 pieces), a large output of 180 W or more is required, and a drive amplifier needs a considerable margin. A large output of -400W is required. An amplifier with such a large output and good sound quality is extremely expensive, physically large and heavy, and in addition, it generates high heat or noise of a cooling fan.

(B) A further problem is that the connection between the large output amplifier and each speaker crawls in the room. In order to realize this system, the star connection system in which the output terminal of the large output amplifier and the speaker are connected at a ratio of 1: 1 is a principle, and therefore + -2 speaker connection lines are required for each speaker. In the case of 6ch, a total of 12 wiring groups connecting the amplifier and the speaker group are required. (C) The twelve wires described above are routed around the room and wired up to a predetermined speaker. With a normal thin wire having a diameter of about 1 mm, the internal resistance causes deterioration of sound quality. For this reason, it is general to use thick speaker wiring with small resistance, but this is extremely expensive and heavy because it is a very thick metal wire. Because of this thickness, it is detrimental to the aesthetics of the room to route twelve speaker wires with a high rigidity of several meters into the room. If this is an office, it is possible to centrally arrange and hide such wiring groups under the floor according to the entire floor raising so that it does not appear on the floor, but such floor raising work is unrealistic in ordinary households. Is. This was a crucial obstacle to the spread of Home Theater.

(D) Furthermore, there is a strong demand for protection of content rights, and the risk of the content contents leaking to anyone other than the authorized contractor must be minimized. For this,
It is absolutely necessary to avoid holding and storing the content data outside the control of the right holder or the supplier. Conventionally, there has been an apparatus suitable for temporarily storing and storing the data in a storage device on hand, decrypting, reproducing, and viewing the data by performing necessary processing at a convenient time. When the speed of the line to be supplied is slow, this method has the effect of absorbing a large speed difference between the input and output, and was a technically effective configuration, but this speed difference decreases and there is no merit. On the other hand, this method of temporarily storing and recording content data on the receiving side is
It has become a problem because of the risk of inducing illegal copying.

[0004]

The typical problems are the following three. 1) Destroy a large number of cables that connect a plurality of speakers and their driving amplifiers from the room. 2) These three types, such as the speed difference of a plurality of data transfer systems, the delay added to each signal for giving a stereoscopic effect to the sound field between a plurality of speakers, and the phase delay of a timing reproduction device included in a plurality of terminal electronic devices. By accurately controlling the delay of and maintaining stable timing synchronization, a smooth and uninterrupted accurate sound image is reproduced. 3) For the purpose of facilitating synchronization of the entire transfer control, there is a method of installing a mass storage device in the transfer control device, storing the data including the content therein, and then transferring the data to a necessary terminal again. Although this has been done in the past, this is an insufficient system for protecting the confidentiality and protection of the stored content data, and it is an incomplete system in terms of copyright protection, so it is urgent to realize an alternative device. Is desired.

[0005]

An electronic device is attached to or built in the vicinity of a plurality of speakers, and a central control / electronic device for the electronic device digitizes an audio signal to the peripheral electronic device of each speaker. Is transmitted by wired or wireless means, the speaker wiring group having a large mass is unnecessary, and the above problem 1) is solved. Further, the central electronic device and the plurality of terminal electronic devices have a delay caused by absorbing speed differences of a plurality of data transfer systems, a delay added to each sound source signal for giving a stereoscopic effect to a sound field between a plurality of speakers,
Furthermore, the phase delay of the timing recovery device included in the plurality of terminal electronic devices. Problem 2) will be solved by introducing a timing delay control system that enables accurate control of these three types of delays.

Further, regarding the legal right protection of contents which will become a problem in the future, it is necessary to temporarily store the contents in a large-capacity storage device in order to save the trouble of synchronization by making the transfer of the entire system as an asynchronous transfer in the past. An easy method is to eject the data from there at any time, but this method reads data once stored in the storage device illegally for purposes other than the legitimate original purpose due to software / hardware tampering. It is not highly recommended as there is a high risk of being taken or taken out. The idea is to construct a synchronous system based on a unified clock without interposing such a large-capacity storage device inside the transfer system, and to create a smooth content without risking infringement of legal rights. We propose a system that enables transfer. Specifically, a control signal including a digitally encoded audio signal is transmitted from the central electronic device to a peripheral electronic device associated with each speaker via a digital signal line. In this case, the connection between the individuals is not the conventional star connection but a ring connection. This is to reduce the amount of wiring than the star connection,
This is because the reproduction signal between the speakers needs to be synchronized.

(B) Transmission to a peripheral electronic device attached to each speaker via a digital wireless LAN. In this case, there is no physical connection, and a signal is transmitted to the peripheral electronic device of each speaker by using the so-called multicast (multiple simultaneous broadcasting) function of the wireless network. The peripheral electronic device of each speaker has a receiving device corresponding to this wireless LAN, receives the digital control signal and audio signal transmitted from the central electronic device, decodes them, and internally outputs the audio signal required for each speaker. It is generated and supplied to the speaker and driven. In this case, since the conventional multicast communication has the same broadcast function as broadcasting, the transmission content of each channel is the same. Therefore, when the content of transfer data is different for each channel to each speaker like home theater, Not applicable. In this plan, by applying the same control as the multicast to the simultaneous transfer with different data only, it is possible to transfer different data with each other while maintaining the synchronization of each channel. It enables the realization of 3D sound sources.

The signals transferred in both a) and b) include
It includes a general control signal, a signal for controlling mutual synchronization of each speaker operation, and signal delay information for compensating an acoustic delay caused by a distance difference caused by the arrangement of each speaker and producing an appropriate stereoscopic effect. B) In the case of ring connection, the electronic devices attached to each speaker are sequentially connected to the series by digital information lines, and serial numbers such as 1, 2, 3 are given to each series. Each speaker has an attached electronic terminal device 12, 1.
Through 3, 14, 15, 16

1 are sequentially connected in a ring shape as indicated by the solid line.

Also in the case of the wireless LAN of (2), the installation position of each speaker is roughly determined. For example, 12 and 15 are left and right front, 13 and 14 are left and right rear, and the like. The physical distance of each speaker from the listener (listener) is arbitrary. In order to realize a stereoscopic effect using the sounds from these five speakers, first, in this case, the five sound source signals from the five speakers are synchronized on the time axis. The thing is a premise. If this is incomplete, the signals from each sound source arrive at each speaker at irregularly irregular timings, so the sound output from each speaker when played back is also completely disjointed, and the rise time of the important sound is also disparate. There is. For this reason, the auditory distance between each speaker and the listener varies and changes from moment to moment. In other words, because the listener's position in this sound field environment changes moment by moment, the listener feels swaying or spinning around and feels uncomfortable.

Even if synchronization is achieved, if the mutual delay time between the speakers is not properly set and the delay is 0, each sound source is reproduced as a sound source that is completely equidistant from the listener. , There is no perspective, which is the basis of three-dimensional sensation, and it is flat and surrounded by a cylindrical wall. In order to make this sound three-dimensional, it is necessary to add a delay corresponding to the distance to the actual sound image to the sound source signal handled by each speaker. As an example of giving this sound source delay, a plurality of sound source signals are appropriately delayed by using a DSP or the like in 11 central electronic control units, and these are individually distributed to respective speaker inputs. In the electronic device attached to each speaker, these signals are directly transmitted to D
If processing such as A conversion is performed and analog signals are supplied to the respective speakers, sound waves after appropriate delay are emitted from the respective speakers, and the stereoscopic effect of the listener is reproduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows. Reference numeral 11 denotes a DSP or an electronic device having a corresponding function, which is a central control processing device that executes control of the entire system and distribution of a sound source signal via a wire or wirelessly. It has a dynamic storage device A1 that manages the amount of delay depending on an internal computer. 12, 13, 14, 15, and 16 are individual electronic devices that receive a sound source signal distributed by wire or wireless from 11 and perform necessary processing to supply a driving signal to each speaker. Normally, it has a function of converting an input digital signal into an analog signal for driving a speaker.
Each of these has a necessary dynamic storage device for delay amount management of A2, A3, A4, A5 and A6. 17 receives the digital signal from 11 and modulates it to 12, 13, 14, 1
It is a wireless transmitter that transfers a digital signal and a control signal to 5, 16 and generally uses a standard protocol such as IEEE802-11b. IEEE1 for wired
In the serial transfer method such as 394, the connection is made in a ring shape, but in the wireless transfer, different contents are simultaneously transferred in parallel to each terminal, so that it becomes a star-shaped connection of 1: n. .

In the case of a star-shaped connection via radio, the synchronization process between the main device 11 and each terminal device must perform independent initialization between them. In this case, 11 first confirms that synchronization with all terminals is completed by the initialization process of the transfer system starting from normal RTS (Request to Send), and prepares and notifies the start of data stream transfer to each terminal device. I do. During this initialization period, a specific identification number is assigned to each terminal device, and accordingly the main device 11 composes a data packet with only the necessary data for each and sends the data to the appropriate terminal. This is because the content to be sent differs for each terminal. These measures are performed by the MAC layer (Med layer) in the data link layer of the LAN protocol.
eia Access Control Layer)
The frame description is used. Unlike the conventional transfer to the terminal, the characteristic of the implementation of the present invention is 1: 1.
However, the simultaneous parallel pseudo-multicast method of 1: 5 to 6 is adopted, but the difference from the normal multicast method is that the contents of transfer data to these plural terminals are all different.

[0013]

EXAMPLE Specific operation CD, DVD or other package media, or recording media such as hard disk, semiconductor memory, CDROM, etc., and digital signals including sound source signals taken in from the network are first sent to the central control unit 11 It is sent, separated from the video signal and the like there, and further decoded and separated into sound source signals of several channels for synthesizing a stereoscopic sound field. Therefore, attributes such as the amount of delay that the sound source signal of each channel should have are added as information. This information is indispensable for producing a stereoscopic effect, and expresses the distance and depth from the sound source. Based on this parameter information, 11 produces an appropriate delay for the digital sound source signal for each channel.

This delay is mainly generated by 11 central control processing units. Alternatively, the sound source signal including the parameter designating the delay amount is transmitted to the electronic devices 12 to 16 attached to the respective speakers.
It is also easy to transfer them to and synthesize individual delayed source signals there. The unique delay amount specified for each speaker and its accurate reproduction are the key points to faithfully reproduce the desired three-dimensional sound field. In order for each speaker to reproduce a sound source signal having an accurate delay amount under the control of each electronic device, it is necessary that they share common reference timing information. No matter how accurate the delay information is, if the reference points (zero points of delay) are not accurately shared, the resulting delay amounts will be different and meaningless. In order to solve the problem, in case of wired connection, 11 to 1
Connect the 6 electronic devices to the series and connect them in a ring.

Using the internal PLLs of these electronic devices 11 to 16, link synchronization between 11 and 12 is first taken, and then 1
It handles the synchronization between 2-13, then takes 13-14,
14-15 and 15-16 are sequentially synchronized, and finally 1
Returning to 6-11, the synchronization processing link is completed. Each P
Since the synchronization processing between LLs is completed in about 1-5 ms, the time until the LLs are circulated and 11-16 are synchronized is at most 30 ms or less. In this case, the master clock is 1
Assuming that only one central control processor occurs and all others are under its control, all 11-16 devices will synchronize exactly to one master clock frequency once this link operation completes. To do. Upon completion of synchronization of all PLLs, the reference timing origin between the speakers converges to one.

This synchronization operation is indispensable for accurate reproduction of a stereophonic sound image, and if accurate synchronization is not achieved, the auditory distances of the sound sources will be different. By this synchronization processing, the sampling clock of the digital / analog converter (hereinafter referred to as DAC) included in the electronic device attached to each speaker can be completely synchronized in the unit of the master clock of tens of MHz. The origin of the signal phase of the electronic device and amplifier attached to each speaker can be perfectly matched, and a very high-quality sound field expression can be obtained. To connect these electronic devices, an optical link system is mainly used to avoid induction noise such as electromagnetic waves. For this, terminals such as TOS link and ST link are used. In some cases, an IEEE 1394 type link is used.

A plurality of speakers and attached electronic devices are
As a method of connecting to the main electronic device which is a signal transmission source, there is a wireless parallel transfer method in addition to the above-described link forming method by wired serial connection. This is a wireless LAN
It is based on a format in which the same content is simultaneously broadcast to a plurality of terminals using the above. However, unlike the case of broadcasting, since the sound source signals required by the speakers corresponding to the respective terminals are all different from each other, a signal including all of them is sent to each terminal all at once, or the terminal side extracts a necessary signal for itself, or
There is a method in which an identification mark is attached to each terminal and different signals required by each terminal are transmitted by a method such as time division or frequency division. In each case, each speaker terminal has 11-
The terminal itself and the main electronic device of the transmission source recognize and determine which one of 16 is hit.

When a wireless LAN is used, each terminal has an individual ID (identification number), and different contents are individually transferred, or there is a method of sending information to all terminals in a batch.
In the former case, when frequency division transmission is performed to six terminals, for example, a frequency band for six channels is required. In the latter case, the frequency is good with one channel, but the transmission rate is required to be 6 times that of the former, and therefore the signal band is also required to be 6 times. In the receiving function on the terminal side, the former, in which only respective signals are sent, can retrieve information more easily. As a method of data multiplexing transmission to a plurality of terminals, a CDMA method that further utilizes a frequency hopping function can also be adopted. In any case, in this application, the indoor operation is premised, so that it is necessary to sufficiently consider the influence of high-power microwave oscillation such as a microwave oven at home. Be careful, as it will be closed.

It is necessary to avoid the frequency band that overlaps the frequency band used by the microwave oven as much as possible and select the frequency band used. Of course, there are not many cases where the microwave oven and the home theater system live together in the same room in actual use, but in Japan's small housing situation, radio waves penetrate these even if they are partitioned by sliding doors. However, in the case of the present invention, it is necessary to devise a part of the control as follows due to the characteristics of the content data. In other words, the contents of data in the transfer channels from 11 to 12, 13, 14, 15, 16 are all different, but in terms of control, the transfer channels are all the same type and the data transmission / reception timings are also the same. Is. In the embodiment, the MAC of the data string sent to each terminal
When transmitting and receiving the header portion (30 octets in length in the IEEE 802.11 standard) in the frame, the basic timing is confirmed for each frame, and if there is no deviation, the transfer data is judged to be valid for the first time. The stream transfer according to the present invention is different from the conventional method in that, for example, when transmitting independent data of a plurality of channels, there occurs a problem that synchronization cannot be achieved with a specific channel, and when the channel data of the frame portion is invalid, the conventional method is used. Normally responds to terminals requesting retransmission of data and each terminal requesting complete data transfer. In the implementation of the present plan, when such a situation occurs, a delay occurs only in the signal of the terminal connected to the specific channel, and the whole is reproduced in a disjointed manner. It is inconvenient.

In the case of the present invention, the transfer signal is the sound source signal of 5 to 6 channels, but fortunately the human auditory reaction is not so quick, so even if the sound from one speaker is cut off for a moment. However, if it does not exceed 100 ms, nothing will be noticed. Therefore, the terminal discards the unnecessary data received during that time, waits for new data, and continues playback from the next data, resulting in only a momentary interruption, and other speakers make normal sound. If this is the case, it will not cause any problems without being noticed by the listener. However, in the conventional method, when each terminal requests retransmission of complete data one by one, the transmission initialization is restarted and the data arrival delay is 100 ms.
Sometimes it exceeds several seconds and it takes several seconds, and the delay once generated on a specific channel cannot be recovered, so a delayed (timing misaligned) sound will continue to be output from the specific speaker until the end. Will be made.

According to the method of the present invention, however, a system including a plurality of terminals is first defined, and within that range, once synchronization is established, a plurality of data are simultaneously sent to the plurality of terminals. Transfer as a stream, and unless there is an instruction from the master transfer device that is the master, depending on the state of each terminal, the control of each transfer channel is not interrupted or restarted, and multiple types of data strings are streamed at once. , It is necessary to carry out uniform control so that the content is transferred to the point of separation and the content does not fall apart in the middle. This means that once multiple devices have been initialized as in this proposal, they are recognized as a single group, and then a system that supplies multiple data streams to corresponding terminals based on the timing of group synchronization is used. This makes possible stream transfer of integrated contents without stagnation.

The central data processing unit 11 supplies necessary signals to each terminal in a timely manner. In the conventional implementation of this purpose, data storage such as hard disk or digital tape recording is performed to facilitate control. There were many cases with functions. Having such a large-capacity storage or recording device is effective in simplifying the transfer control method, but it has the property of recording a large amount of content information temporarily or semi-permanently. This is an undesired function in terms of copyright protection. Therefore, in the present proposal, the function of recording content data such as digital sound source data in a collective form is excluded, and this recording portion is configured so that the content can be played only once. When the actual content is reproduced, it must be completely identical in time series to the original performance. If this is different for both, accurate sound source reproduction will not be achieved. Items necessary for this realization are:

(1) Reproduction of accurate timing. If this is not realized, the music will be different in terms of audibility when playing and when playing. That is, the timing clock cycle at the time of recording and the timing clock cycle at the time of reproduction must be exactly the same. (2) Supply of smooth and uninterrupted time series data. For example, even if the above (1) is accurate, if the smooth and uninterrupted supply of time-series data is not realized, the data stream is interrupted and the sound is interrupted each time.
It becomes very difficult to hear. In order to realize this (2), conventionally, one segment of the content data that has been considerably collected is once stored in a large-capacity storage / recording device, this large-capacity data is extracted at the request of the terminal, and transferred to each terminal. It was a sufficient situation if I was doing it.

In this method, the control of the data flow is simple, and since the storage function acts as a timing buffer, real-time transfer is not particularly required. Therefore, the execution speed at the time of writing and reading the hard disk is There was no problem if I was paying enough attention to the speed of the line. Moreover, due to recent advances in hardware, for example, once storing digital data for a few songs to a few dozen songs on a hard disk was extremely straightforward and easy to implement, this simple method is still widely used. It has been applied. However, due to the demands of the era as described above, it is not allowed to store a large amount of digital data including contents in the recording / memory function once without the sufficient recognition / understanding of the right holder. The situation has come to an end. For this reason, it is necessary to fundamentally review such a conventional technically simple implementation method and device. This proposal proposes a system that can smoothly supply high-quality contents to a well-meaning user with peace of mind while meeting the demands of the times.

The input of the main body electronic device is assumed to be content data obtained by a legal means that has cleared the copyright problem. When data is input, whether from the net or from a package such as a CD, the reproducing side and the output side are ready, and wait for data input in the "Ready" state.
This handshake synchronization is a prerequisite for starting smooth data transfer. Once this transfer starts, even if the data transfer rates of the transmitting side and the receiving side are different, it is necessary to absorb this discrepancy in some way and prevent frequent data interruptions. To this end, during transmission and reception, a "dynamic buffer" is actually provided inside the central electronic device to absorb the problems caused by the timing difference between the two. Although this dynamic buffer device is a temporary memory functionally equivalent to a FIFO, it is a temporary memory, and the stored contents change dynamically from moment to moment. Therefore, unlike the static memory used conventionally, it is impossible to read the stored contents again later, or to hold and manage the contents by a file name.

Since it is difficult to store the collected content data in the storage device for copyright protection, the content data can be temporarily stored and stored in a batch, and the content data can be quoted and used for control when necessary. Such a conventional configuration cannot be adopted. This is because with this configuration, a slight modification of the hardware or software can be used as an auxiliary device for copyright infringement. Therefore, in order to dispel such a suspicion, it is important that the electronic device does not include a hard disk used for this purpose or a large-capacity static storage device corresponding to the hard disk used for this purpose. A FIFO or the like is generally used as the configuration of the "dynamic buffer", but this configuration is well known. This dynamic buffer is installed in both the central electronic device and the terminal electronic device.

Incidentally, the dynamic buffer A1 of the central electronic device
And dynamic buffers A2, A3, A4 placed in the terminal electronics
The functional differences from A5 and A6 are as follows. A1 is for absorbing a macroscopic discrepancy between the input timing from an external Internet line, a mobile phone, a package media, etc. and the transfer speed for sending data to each system terminal. The format and speed of the former speed are substantially determined by the device, line, etc. connected to the outside. On the other hand, the latter is USB or IEEE 1394 with a system terminal (electronic device attached to a speaker terminal), or wirelessly IEEE802.
1b, BlueTooth, etc. It depends on the standard connection format adopted. For this reason, there may be a discrepancy between the transfer rates and timings of both input and output. In order to absorb this difference and prevent data interruption and data overflow (overflow) in the buffer, it is necessary to insert a dynamic buffer with an appropriate depth.

Further, the data required by each terminal has a time delay, especially in the case of a stereophonic sound source. In the case of, for example, the Dolby method, this delay amount is basically incorporated in the supplied original data, but strictly speaking, it is the speaker of 12, 13, 14, 15, 16 speakers in each room. It is necessary to finely adjust the delay amount depending on the installation position. These adjustment delays are added to the transmitted and supplied sound source data, processed as sound source data having a delay amount to be supplied to the system, and supplied to each terminal device. Dynamic buffers A2, A3, A4, A5 in the terminal device
Basic functions of A6. This is the sender's 11 in the configuration of the present invention.
Is a buffer required to maintain strict synchronization between the receiving side 12, 13, 14, 15, and 16. For each terminal, the sent digital data must be converted into an analog sound source signal, and for this purpose, a highly accurate DA converter is used. However, this DA converter
Not only the distortion of the signal itself, but also the irregularities and fluctuations of the clock to be driven are extremely sensitive to jitter. Therefore, in order to maintain good playback sound quality, 11, 12, 1
It is not preferable in terms of sound quality to use the clock whose period is locked by linking the PLL inside each of the terminal devices 3, 14, 15, 16 as it is as the reproduction clock of each DAC.

Because, it is only the clock period that is locked in the link configuration, and the phase between the clocks generated in each PLL cannot be sufficiently locked. Therefore, each terminal uses the internal clock generated by the PLL of each terminal within the locked fixed period as the conversion clock of each DA converter, so that the timing fluctuation of the entire system can be prevented by the DA converter of each terminal. Must be prevented from affecting. That is, the data supplied from the central electronic device 1 is sent out according to the clock locked in the common cycle by the PLL inside 11, but the clock received by each terminal is not locked in the cycle. However, it is a clock generated in the PLL of each terminal, and in the DA converter of the terminal, the received data is resampled by the clock of this individual PLL to perform analog conversion. Therefore, inside the terminal,
A clock of data supplied from the outside (from 11),
Since the clock used in each terminal has the same cycle in the long run and the details are different in actuality, there is a risk of timing deviation between them, and there is a danger of absorbing this difference. You need a buffer.

However, the delay adjustment amount for this is not so large as in the case of A1 of 11, but since the step is fine and the speed is high, A
Since it is difficult to control the delay amount by software as in No. 1, it is preferable to control by hardware. A method generally used for the transfer with the CD media is a method for achieving frame synchronization by utilizing a "word synchronization (Sync)" signal which is a signal for switching left and right data. This is the exact one
By using the "word synchronization (Sync)" signal synchronized with the basic clock of 28 fs or 256 fs as the sending sync signal of the dynamic data buffer in the main electronic device, the data string sent from the main electronic device and this are received. It is possible to achieve accurate frame cycle synchronization among a plurality of terminal devices.

By placing these dynamic buffers in place of conventional large-capacity static storage devices, all or part of copyrighted content data can be collectively stored in storage devices other than the transmitting side. It is possible to avoid the risk of being stored in. From the viewpoint of the user who is the viewer, even in a long movie such as a long movie or an opera, in the actual performance, the viewer usually has a break because the viewer's tension does not continue. It is rare for non-stop performances over time. In addition, it is meaningless to continue to watch content for more than 2 hours at home, considering that content is viewed in everyday life. That is, the process of collectively storing the contents of more than 2 hours over 30 minutes from the network and temporarily storing the contents in a large-capacity storage device such as a hard disk is an operation which has little meaning for the original purpose of content viewing. If the dynamic storage buffer device according to the present invention is adopted, data will be continuous unless the dynamic buffer becomes empty. Therefore, if there is a buffer storage capacity of about 1 gigabyte at most, the transfer of the supply network Unless you're running out of bandwidth
There is no concern that the buffer will become empty and the data will be interrupted while watching the contents for about 2 hours.

Further, in the user's payment cost, in the conventional method of once downloading a large content to the entire hard disk or the like, since the number of received packets is huge at the time of downloading, the packet proportional reception fee (download fee) is also high. Becomes Viewers usually have few opportunities to watch a large amount of content once downloaded from start to finish.
Most of the time, people appreciate the time of 1/2 or 1/10. In this case, the user pays the download fee to the supplier for several times the actual viewing time, which is not economical for general users. Moreover, this unused data, which is several times larger than the amount of data that can be viewed effectively, is actually delivered to the user terminal via the network, so the network line becomes unnecessarily congested and there is no margin in communication capacity. , The probability of causing unnecessary line congestion increases.

In addition, although taking in all of them at a convenient time and storing them in the storage device is less effective for the original purpose of content viewing as described above, in addition to the above-mentioned harmful effects, Problem arises. In other words, the conventional method of temporarily storing the contents in the large-capacity storage device has a property of easily causing a legally serious problem, that is, an illegal act, although the purpose is almost unnecessary. In other words, general users do not prefer to discard or re-download each time the content is originally limited to one limited viewing time, and those that are once acquired and stored in their own device are: It has the desire to appreciate as many times as you like. Further, it is also a desire to enjoy the content that he / she viewed with friends and the like. In this way, if the content data is stored in a storage device such as a hard disk under its own control and finished, it can be distributed or transferred to a third party or a friend, whether paid or free, to share the fun. Since it is easy to carry out a profit,
It is not easy to actually prohibit this. Although a mechanism to prevent such a kind of piracy has been devised using hardware and software, none of the techniques are absolute, and in fact, comparing the wisdom of the defender and the defender, The reality is that we're going to be crazy.

This is not only an adverse effect of the conventional system in which a large-capacity storage device, which is not always necessary for the original purpose, is easily introduced into the system, in exchange for the technical easiness to catch one side of data transfer. Without sufficiently avoiding the problems caused by the introduction, it leads to the situation where the market is provided with a device that triggers an illegal act against the copyright protection which will become more and more important in the future. In this way, the situation on the user side is unstable, and if there is room to use the content that has been arbitrarily captured, the rights of the content creator and the supplier side may not actually be protected. Occur. This is a harmful phenomenon in order to measure the sound distribution of contents. It can be said that the realization of a device that contributes to content viewing without the conventional large-capacity storage device, as in the case of the present invention, is of great social significance.

[0034]

The effects of the present invention include two events. (1) When configuring a home theater with excellent stereophonic effects in a room of a general household, the quality of wiring connecting several or more speakers and a central processing unit such as a main amplifier is a problem, and it is considerably thick. Since the quality of the sheath is required, the mass of the wiring metal becomes large, which is extremely inconvenient for wiring in the home, including poor appearance. By adopting the present invention, this can be replaced by a much thinner and easier-to-use digital transmission line or wireless, so that the wiring in the room is neat and the appearance is not spoiled, and the desired high-quality stereophonic sound can be realized.

(2) In order to realize the reproduction of digital contents without problems, it is essential to guard against illegal acts such as illegal copying of contents. Although various protection methods have been considered for this purpose, all of them temporarily store part or all of the content in a mass storage device such as a hard disk, perform file management, and then read the data. Are being supplied for processing. However, in this method, since a device such as a hard disk in which contents are once stored actually exists, it is necessary to thoroughly manage the physical and contents, and it is very difficult for a general person to protect the stored data in practice.

According to the present invention, since there is no mass storage device for statically storing and managing the content itself as described above, it is possible to collectively store, record, manage and reuse these contents. Absent. Therefore, since it is not possible to perform the actions such as storing, recording, managing, and reusing necessary for the acts such as illegal copying, the system provides the system in which the illegal acts cannot be performed in the first place. This makes it possible to avoid providing the general user with a configuration that is convenient for the original reproduction purpose and can be used for performing illegal acts such as copying, unlike the conventional art. In other words, as in the past, a system configuration is provided that facilitates the realization of both merit and demerit, and if the usage is not thorough, such as relying on control software or restrictions on the usage form of the user, some unscrupulous acts Cannot be effectively prevented. According to the present plan, the content supplier can legally supply the user's or a third party's content to the user without worrying about allowing such piracy. The user cannot own or occupy the content in the storage device once on his or her own device, so that the content may be mistakenly accidentally transferred or supplied to a third party. It becomes difficult, and the effect of suppressing such illegal acts by Service-to-Other persons is great.

[0037]

[Brief description of drawings]

FIG. 1 shows an implementation configuration of the present invention by wire or wireless.
A solid line connecting the respective elements indicates a wired connection that is connected by an actual physical line, and a broken line indicates a wireless connection. 11 is a central control electronic device. Reference numerals 12, 13, 14, 15, and 16 denote speakers arranged at positions that form a three-dimensional sound field and terminal devices that drive the speakers. A transmitter / receiver 17 modulates a signal from the central electronic device 11 and puts it on a radio wave. Reference numeral 18 indicates a listener. A1 is a dynamic storage device inside the central electronic device 11, A
2, A3, A4, A5, A6 are 11, 12, 13,
It is a dynamic storage device provided inside 14, 15, and 16.

[0038]

[Explanation of symbols]

11 is a central control electronic device. 12, 13, 14, 15, 1
Reference numeral 6 denotes a speaker arranged at a position forming a three-dimensional sound field and a terminal device for driving the speaker. A transmitter / receiver 17 modulates a signal from the central electronic device 11 and puts it on a radio wave. 1
8 indicates a listener. A1 is a dynamic memory device inside the central electronic device 11, and A2, A3, A4, A5 and A6 are each 1
1, 12, 13, 14, 15, and 16 are dynamic storage devices provided inside.

Claims (2)

[Claims] 1. In a system for receiving content data by connecting to a high-speed broadband digital network and reproducing the content data, a special means or device for temporarily storing or recording all or part of the content is provided. There is not, correction control on the time axis for fine adjustment for absorbing the difference between the network and the internal transfer speed, correcting the delay difference between a plurality of contents, and accurately reproducing the clock and data phase difference of the data reproduction system. A copyright-protected content reproduction system having a dynamic storage device that adjusts and manages only the delay amount according to the above. 2. In a system for receiving content data by connecting to a high-speed wideband digital network and reproducing the content data, the content data is transferred to an internal data transfer system having a plurality of branches realized via a wireless connection. In the system of playing back and playing back, there is no special means for statically storing or recording all or part of the content as a unit, and the necessary delay amount is unified by only the correction control on the time axis. In a content reproduction system having a dynamic storage device for dynamically managing,
The plurality of transfer channels are grouped, the transfer within the group is collectively controlled by the internal unified timing, and even if an error occurs in each transfer channel, the data is discarded without requesting retransmission, and the unification is performed. A device having a control function that enables smooth data transfer without deviating from the synchronization of individual channel transfers from the flow of the synchronization stream.