JP3695942B2 - AV system with IEEE1394 bus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an IEEE 1394 bus equipped AV system in which a control device and a source device are connected by an IEEE 1394 (formally IEEE 1394-1995, but omitted in this specification, IEEE 1394) bus.
[0002]
[Prior art]
There has been proposed an IEEE 1394 bus equipped AV system in which a control device and a source device are connected by an IEEE 1394 bus (strictly called “IEEE 1394 high-speed serial bus”) and isochronously transfer AV data. In the AV system equipped with the IEEE1394 bus, up to 63 devices can be connected by the IEEE1394 bus, and even if each device is arbitrarily turned on / off, connected or disconnected, the bus reset is applied, and the topology is It is automatically reset.
[0003]
[Problems to be solved by the invention]
The control device is equipped with a command conforming to “AV / C Digital Interface Command Set (currently Version 1.0)”, and the source device is controlled asynchronously by transferring the command to the source device. However, it is difficult to control a source device that does not conform to “AV / C Digital Interface Command Set”. In a conventional IEEE1394 bus equipped AV system, control devices, "AV / C Digital Interface Command Set" in the command with asynchronous transfer defined by and U NI T INFO (0 data stream 0), the response is obtained Otherwise, it gives up the output of audio and video as a source device that cannot be controlled.
[0004]
In addition, in the IEEE1394 bus equipped with AV systems, scale is made on a large scale, the source device is distributed to each room, is located, the user, in addition to the throat of good UNA source device IEEE1394 bus in the room other than your own room You may not be able to figure out if it is connected to. In a conventional AV system equipped with an IEEE 1394 bus, the user can know what source device is connected to the IEEE 1394 bus as a source device that can be controlled by the control device, but the source of another room can be known. I didn't know what source devices were in the other rooms that were devices and could not be controlled by the control device.
[0005]
An object of the present invention is to provide an AV system equipped with an IEEE 1394 bus that can overcome the above-mentioned problems.
[0006]
[Means for Solving the Problems]
The IEEE1394 bus equipped AV system (10) of the present invention has the following (a) to (c).
(A) Demodulating means (11, 69) for demodulating the data stream isochronously transferred through the IEEE 1394 bus (13)
(B) Determination means (11, 66) for determining whether or not the demodulating means (11, 69) is a decodable data stream for each channel.
(C) Display means (19, 68) for displaying the determination result of the determination means (11, 66) to the user as the first information
[0007]
In this specification, “demodulation” is based on the general use of those skilled in the art, and encompasses both the concepts of demodulation and decoding. “Demodulation” is used as not excluding the concept of decoding.
[0008]
The demodulating means (11, 69) and the judging means (11, 66) may be provided in a common control device (11), or may be provided in separate IEEE 1394 bus connection devices (69, 66). . The first information displayed by the display means (19, 68) to the user may be only information indicating which channels can be demodulated by the demodulation means (11, 69), and further, the information about all channels. It may be information indicating whether the channel can be demodulated by the demodulation means (11, 69). Whether the demodulating means (11, 69) can demodulate the data stream is determined by, for example, the type of the data format of the isochronous resource channel extracted from the header information of the received packet by the judging means (11, 66). It becomes clear by examining. Packet header information, "Audio & Mu si c Data Transmission Protocol ( the current version is 1.0)" as long as it has been defined on the basis of the standard to say, the manufacturer and model of the source device (12a, 12b) It can be detected from the packet header information regardless of the above.
[0009]
It is assumed that the data stream asynchronously transferred via the IEEE 1394 bus (13) includes only audio, only video, and both audio and video. The source device (12a, 12b) is, for example, a CD player, an MD player, a DVD player, or the like. Whether or not the control device (11, 66) can control the source device (12a, 12b) depends on whether the control device (11, 66) is a UNIT INFO (AV / C Digital Interface Command Set) defined by, for example, “AV / C Digital Interface Command Set”. The command of 0 data stream 0) is asynchronously transferred to each source device (12a, 12b), and it is determined by whether or not there is a response. For a source device compatible with “AV / C Digital Interface Command Set”, UNIT INFO (0 data stream 0) is an essential command.
[0010]
The source device (12a, 12b) connected to the IEEE 1394 bus (13) has a control device (11, 66) that does not conform to the command of the source device (12a, 12b) and cannot be controlled. (12a, 12b). However, there are cases where the demodulating means (11, 69) can demodulate the data stream even if the source device (12a, 12b) cannot be controlled by the control device (11, 66). For example, a case where data format of the data stream is based on the "Audio & Mu si c Data Transmission Protocol" and words earthenware pots standards are defined. In this way, if the control device (11, 66) cannot be controlled and the source device (12a, 12b) is isochronously transferring a decodable data stream, the source device (12a, 12b) The user can know the information. In particular, there are many advantages when the AV system (10) equipped with the IEEE1394 bus becomes large-scale and a large number of source devices (12a, 12b) are arranged in a room different from the room where the user is located. In addition, operations such as playback and stop of the source device (12a, 12b) that the control device (11, 66) cannot control can be performed manually by the user directly to the location of the source device (12a, 12b), It will ask other people to operate.
[0011]
The IEEE 1394 bus equipped AV system (10) of the present invention further includes the following (d) and (e) .
(D) determination means (11,66) for determining the cans path knee of the node ID from the query to detect further that node ID to node ID in use by the query to the root node for the channels that are capable demodulated Detection means for detecting ID and / or device type (11, 66)
(E) the source device (12a, 12b) for each channel detecting means (11,66) detects a can path knee ID and / or device type to the user along with the first information as the second information Display means to display (19, 68)
[0012]
For example, if the source device (12a, 12b) performing isochronous transfer is compliant with “AV / C Digital Interface Command Set”, the command “Channel Usage (0AV data 2)” is used. If the root node is inquired by transfer, the node ID of the device using the isochronous resource channel can be received and returned from the root node by asynchronous transfer. Further, the detection means (11,66) is turned by the source device (12a, 12b) of the node ID navel of the can path knee ID and query the device type, to detect the can path knee ID and device type than answers be able to. Thus, the user can together with the first information and the second information to obtain, after viewing or recording, to consult the output to the AV output means for recording, etc. (16, 17).
[0013]
IEEE1394 bus equipped AV system of the present invention (10) further, (f) of the first information and second information, the channel selected by the user based on at least the first information demodulating means (11,69 ) And control means (1, 66) for outputting video and / or audio to the AV output means (16, 17).
[0014]
Since the demodulating means (11, 69) can demodulate the channel displayed in the first information as demodulating means (11, 69), if there is a user's selection, the demodulating means (11, 69). ) Is demodulated, and the AV output means (16, 17) outputs video and / or audio, and the user can watch it (this “viewing”), the source device is an audio-only source device such as an MD player. In this case, it is possible to include “listening” by outputting only sound. In this way, even if the control device (11, 66) is a source device (12a, 12b) that cannot be controlled, the user sees the first information, and the IEEE 1394 bus (13) from the source device (12a, 12b). AV data that is isochronously transferred can be output from the AV output means (16, 17) for viewing.
[0015]
According to the IEEE 1394 bus equipped AV system (10) of the present invention, the determination process of the determination means (11, 66) is executed each time a bus reset occurs in the IEEE 1394 bus (13), and the processing result is stored in the memory. The display processing by which the display means (19, 68) is written is performed based on the processing result read from the memory.
[0016]
When a source device (12a, 12b) is additionally connected to the IEEE 1394 bus (13) or a predetermined source device (12a, 12b) is removed from the IEEE 1394 bus (13), a bus reset is applied. The channel assigned to each source device (12a, 12b) and the node ID of each source device (12a, 12b) change. Each time a bus reset occurs in the IEEE 1394 bus (13), the determination process of the determination unit (11, 66) is performed again, and the result is re-recorded in the memory. Therefore, the information display by the display unit (19, 68) Reliability is improved.
[0017]
The IEEE 1394 bus equipped AV system (10) according to the present invention further includes (g) a demodulating unit for each channel determined by the determining unit (11, 66) as a data stream that can be demodulated by the demodulating unit (11, 69). There is channel scanning means (11, 66) for performing channel scanning for demodulating to (11, 69) and outputting video and / or audio to the AV output means (16, 17).
[0018]
The IEEE1394 bus equipped AV system (10) of the present invention has the following (a) to (c).
(A) Demodulating means (11, 69) for demodulating the data stream isochronously transferred through the IEEE 1394 bus (13)
(B) Judgment means (11, 66) for judging whether or not the IEEE 1394 bus (13) is a demodulatable data stream channel.
(C) The data stream determined by the determining means (11, 66) as a data stream that can be demodulated by the demodulating means (11, 69) is demodulated by the demodulating means (11, 69) by channel scanning and output as AV. Channel scanning means (11, 66) for performing channel scanning for causing the means (16, 17) to output video and / or audio
[0019]
The AV output means (16, 17) includes not only a speaker but also other AV output means such as a headphone and a recorder or a recorder.
[0020]
In this way, a channel scan is performed for the demodulatable channel, and the user can know what audio and video can be demodulated.
[0021]
According to the IEEE 1394 bus equipped AV system (10) of the present invention, when a channel is selected by the user for the channel being output from the AV output means (16, 17) during the channel scan by the channel scan means (11, 66). The channel scan is stopped and the output of the currently output channel is continued.
[0022]
During the channel scan, the user can select the channel when the favorite sound or video is output, and can continuously watch the channel thereafter.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram of an AV system 10 equipped with an IEEE 1394 bus. The AV receiver 11 and source devices 12 a and 12 b such as an MD player and a DVD player are connected by an IEEE 1394 bus 13. In the figure, the two source devices 12a and 12b are connected to the IEEE 1394 bus 13, but this is only for the sake of simplification of description, and the IEEE 1394 bus equipped AV system 10 includes the IEEE 1394 bus. The source device 12n is additionally connected through 13 or the source devices 12a, 12b and 12n once connected are disconnected after that. When a source device is newly connected or disconnected, or when each connected device of the IEEE 1394 bus equipped AV system 10 is switched on / off, a bus reset occurs and the node ID is changed. The AV receiver 11 is connected to the monitor 16 and the speaker 17 by a cable different from the IEEE 1394 bus 13, and transmits / receives data to / from them, and also transmits / receives data to / from the handy remote control 18 by light or infrared rays. Yes. The handy remote control 18 includes a display unit 19 for displaying an operation screen to the user and a key 20 operated by the user. The AV receiver 11 has a built-in demodulator and CPU in addition to an IEEE 1394 bus interface, which is naturally a connected device to the IEEE 1394 bus 13.
[0024]
FIG. 2 is a flowchart of the determination process performed by the CPU of the AV receiver 11. When the AV receiver 11 is turned on (powered on), a new source device is additionally connected to the IEEE 1394 bus 13, and a source device that has been connected to the IEEE 1394 bus 13 is disconnected, the IEEE 1394 bus 13 causes a bus reset. This determination process is performed every time a bus reset occurs, and further according to an appropriate instruction from the handy remote controller 18 by the user. In S30, since the isochronous resource channel is defined from 0 to 63, first, 0 is substituted for N as an initial value. In S31, the AV receiver 11 receives the isochronous resource channel N. In S32, it is determined whether or not channel N data has been received. If Yes, the process proceeds to S33, and if No, the process proceeds to S36. In S33, the header of the packet of received data is analyzed. In S34, it is determined whether the data stream can be demodulated by the demodulator of the AV receiver 11 based on the analysis of S33. Isochronous resource channel arbitration from the beginning, the data prefix comprises a packet, and a data end, the header information of the packet is referred to as "Audio & Mu si c Data Transmission Protocol" are defined based on the standard Therefore, by reading the header information, the type of the data format can be determined, and it can be determined from this type whether demodulation is possible. If the data stream can be demodulated, the process proceeds to S36 via S35, and if it cannot be demodulated, the process skips S35 and proceeds to S36. In S35, the isochronous resource channel N determined to be demodulated and the data format are stored in the RAM. In S36, N is incremented by 1. In S37, it is determined whether or not N is 64 or more. If the determination is No, the process returns to S31, and if Yes, the determination process is terminated. Thus, all of the channels that can be demodulated by the AV receiver 11 from among the channels currently flowing through the IEEE 1394 bus 13 are stored in the RAM.
[0025]
FIG. 3 is an example of a display screen in which the decodable channel list 21 created based on the determination result of FIG. The display screen of FIG. 3 is created by reading data from the RAM storing the data in S35 of FIG. This display screen may be automatically displayed after the determination process of FIG. 2 is completed, or the user may give an instruction from the key 20 of the handy remote control 18 and be called by the monitor 16. . For each channel, a data format (DataFormat), a node ID (Node ID), a device type (DeviceType), and a manufacturer (Company) are displayed. If an isochronous transfer device conforms to “AV / C Digital Interface Command Set”, the AV receiver 11 uses the channel to a plurality of nodes connected at that time. The node ID can be detected by inquiring about the current node ID using asynchronous transfer. In this case, each node can be inquired by sending one command individually, or can be inquired by sending one command to all nodes at once using broadcast transfer. You can also. The AV receiver 11 further inquires and detects the device type and manufacturer name using the asynchronous transfer to the detected node ID. The device type and manufacturer name may be detected between S34 and S35 in FIG. 2, or the data stored in S35 is read from the memory, and the demodulatorable channel list 21 is created based on the data. It may be done. The user looks at the demodulatable channel list 21 and knows the data format, node ID, device type, and manufacturer for each channel. In the demodulatable channel list 21 shown in FIG. 3, there are a total of five channels 0 to 4 that the AV receiver 11 can demodulate the data stream, of which three channels 0, 2, and 3 are “AV”. It can be seen that the source device conforms to “/ C Digital Interface Command Set”, and the node ID, device type, and manufacturer name have been found. When the user operates the key 20 of the handy remote controller 18 to select a channel to be viewed and confirms, the selected channel is output from the monitor 16 and the speaker 17 (in the case of only an audio data stream) There is no video output from the monitor 16 and only audio output from the speaker 17). In FIG. 3, channel 2 is selected. In the screen of FIG. 3, a SET key 22 and an EDIT key 23 are displayed in addition to the demodulatable channel list 21, and the SET key 22 will be described in S55 of the flowchart of FIG. When the user confirms the EDIT key 23, the display screen of FIG. 3 disappears and the screen is switched to the menu screen or the like. This demodulatable channel list 21 can be displayed on the monitor 16 not by the display unit 19 of the handy remote controller 18 but by the user's operation on the key 20 of the handy remote controller 18.
[0026]
FIG. 4 is a flowchart of channel scan processing. As can be seen from S50, this channel scan is performed after the display of FIG. 3. However, the channel scan may be performed by an instruction from the user as appropriate regardless of the display of FIG. When the list-up operation, that is, the display of the demodulatable channel list 21 of FIG. 3 is finished (S50), the user waits for a channel search (= channel scan) instruction (S51). When instructed, 0 is substituted for N as an initial value (S52), reception of isochronous resource channel N is started (S53), demodulated, and decoded according to the type of data format (S54), The decoded AV data is output from the monitor 16 and / or the speaker 17. When the user wants to watch the video from the monitor 16 and / or the sound from the speaker 17 and continue watching it, the user operates the key 20 of the handy remote control 18 to select the SET key 22 in the display unit 19, If it is decided, but it is desired to move to the output of the next channel, the SET key 22 is left without being decided, and a fixed time elapses (S55, S57). If the fixed time has passed without the SET key 22 being confirmed, N is incremented by 1 (S58), and N is not greater than the channel MAX of the demodulatable channel list 21 as the maximum channel? Is determined (S59). When the user confirms the SET key 22 within a predetermined time, the process proceeds to S56, the reception channel is fixed to the currently received channel, the channel scan is stopped, and output from the speaker 17 and / or the monitor 16 is in progress. So that the sound and video can be continuously viewed.
[0027]
FIG. 5 is a block diagram of another AV system 10 equipped with an IEEE 1394 bus. In the IEEE 1394 bus equipped AV system 10, the control device and the demodulation device are separated. That is, the personal computer 66 has a function as a control device, the amplifier / receiver 69 has a built-in demodulator, and the personal computer 66 and the amplifier / receiver 69 are connected together with the source devices 12a and 12b by the IEEE 1394 bus 13. The monitor 16 and the speaker 17 are input with the demodulated AV data from the amplifier / receiver 69 and output video and sound. The personal computer 66 displays an operation screen on the display 68, and the user operates the keyboard 67 to send an instruction to the personal computer 66. The amplifier / receiver 69 demodulates the data stream for the channel determined to be demodulatable by the personal computer 66, outputs the demodulated data to the monitor 16 and the speaker 17, and outputs video and audio from the monitor 16 and the speaker 17. .
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an AV system equipped with an IEEE 1394 bus.
FIG. 2 is a flowchart of determination processing performed by the CPU of the AV receiver.
FIG. 3 is an example of a display screen in which a decodable channel list created based on the determination result of FIG. 2 is displayed on the display unit of the handy remote controller.
FIG. 4 is a flowchart of channel scan processing.
FIG. 5 is a configuration diagram of another IEEE 1394 bus equipped AV system.
[Explanation of symbols]
10 AV system with IEEE1394 bus 11 AV receiver (control device , control means , demodulation means , determination means , detection means , channel scan means)
12a, 12b Source device 13 IEEE 1394 bus 16 Monitor (AV output means)
17 Speaker (AV output means)
19 Display section (display means)
66 PC (control equipment , control means , determination means , detection means , channel scan means)
68 Display (display means)
69 Amplifier and receiver (demodulation means)

Claims (6)

(A) demodulation means (11, 69) for demodulating the data stream that is isochronously transferred through the IEEE 1394 bus (13);
(B) By examining the data format type of the isochronous resource channel extracted from the header information of the received packet, the data format of the data stream is based on a standard called “Audio & Music Data Transmission Protocol”. Determining means (11, 66) for determining that the demodulating means (11, 69) is a demodulatable data stream for the channel ,
(C) display means (19, 68) for displaying the determination result of the determination means (11, 66) to the user as first information;
(D) A node ID in use is detected by an inquiry to the root node for a channel whose determination by the determination means (11, 66) can be demodulated, and a company ID of the node ID is obtained by an inquiry to the node ID. And / or detection means (11, 66) for detecting the device type, and (e) the company ID and / or device of the source device (12a, 12b) for each channel detected by the detection means (11, 66) The display means (19, 68) for displaying to the user the type as second information together with the first information;
An AV system equipped with an IEEE 1394 bus, characterized by comprising: (F) Of the first information and the second information, a channel selected by the user based on at least the first information is demodulated by the demodulating means (11, 69) to the AV output means (16, 17). Control means (1,66) for outputting video and / or audio,
The IEEE 1394 bus equipped AV system according to claim 1, wherein The determination process of the determination means (11, 66) is executed each time a bus reset occurs in the IEEE 1394 bus (13), the result of the process is written into the memory, and displayed by the display means (19, 68). 3. The IEEE 1394 bus equipped AV system according to claim 1, wherein the processing is performed based on a processing result read from the memory. (G) The demodulating means (11, 69) sequentially demodulates each channel determined by the judging means (11, 66) as a data stream that can be demodulated by the demodulating means (11, 69), and AV output means Channel scanning means (11, 66) for performing channel scanning for outputting video and / or audio to (16, 17),
The IEEE 1394 bus equipped AV system according to any one of claims 1 to 3 , wherein (A) demodulation means (11, 69) for demodulating the data stream that is isochronously transferred through the IEEE 1394 bus (13);
(B) Judgment means (11, 66) for judging whether or not the IEEE 1394 bus (13) is a channel of a decodable data stream;
(C) The demodulating means (11, 69) demodulates the data stream determined by the judging means (11, 66) as a data stream that can be demodulated by the demodulating means (11, 69) by channel scanning. Channel scanning means (11, 66) for performing channel scanning for causing the AV output means (16, 17) to output video and / or audio,
An AV system equipped with an IEEE 1394 bus, characterized by comprising: If there is a channel selection by the user for the channel being output from the AV output means (16, 17) during the channel scan by the channel scan means (11, 66), the channel scan is stopped and the channel currently being output The IEEE 1394 bus equipped AV system according to claim 4 , wherein the output of the IEEE 1394 bus is continued.

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