JPH10285248A - Transmitter, receiver and transmission and reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter capable of transmitting audio signals of plural source devices to an IEEE 1394 bus by one data packet. SOLUTION: Analog audio signals AA1 to AAn from the plural source devices are converted into digital audio signals DA1s to DAns in the same sampling timing in respective AD converters 12-1 to 12-n, converted into parallel signals in a serial-parallel signal converters 22-1 to 22-n, after that additional data is added in a data adding circuits 24-1 to 24-n and defined as data blocks DB which is grouped by the same sampling timing. And the DB in one isochronous cycle is transmitted to the IEEE 1394 bus 20 by one data packet ISDT.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter, a receiver, and a transmission / reception system for transmitting / receiving AV signals of a plurality of source devices via four transmission paths, and more particularly to a transmitter, a receiver, and a transmission / reception system capable of transmitting / receiving AV signals of a plurality of source devices simultaneously. It is about.

[0002]

2. Description of the Related Art A transmitting / receiving system for transmitting AV signals by connecting devices such as a DVD (Digital Video Disk) and a digital camera equipped with an IEEE 1394 interface via an IEEE 1394 bus is known. In the IEEE 1394 transmission / reception system, one data packet is assigned only one predetermined channel number. Therefore, if devices connected to the IEEE 1394 bus are nodes A, B, C, and D, for example,
Data packets from node A to multiple nodes B,
Although it is possible to transmit data to C and D, a plurality of nodes A, B, C
Unable to transmit data to That is, when transmitting data from a plurality of nodes, a plurality of data packets having different channel numbers are required.

[0003]

Problems when transmitting and receiving AV signals using the IEEE 1394 transmission and reception system are as follows. (A) When a source device having an IEEE 1394 interface and an AV signal input device are directly connected to an IEEE 1394 transmission line, the AV signals of a plurality of source devices are collectively transmitted as one data packet and transmitted to a corresponding AV signal input device. It is difficult to deliver. Since multiple data packets can be included in one isochronous,
AV signals from a plurality of source devices can be delivered to corresponding AV signal input devices by using a plurality of data packets, but in this case, a plurality of channels of isochronous signals are consumed. (B) When a plurality of IEEE 1394 devices not equipped with an IEEE 1394 interface are connected to a common transmitter equipped with an IEEE 1394 interface, and the AV signal of each source device is transmitted to the IEEE 1394 transmission path via the transmitter equipped with the IEEE 1394 interface,
Since a switch is interposed between the plurality of source devices and the transmitter having the common IEEE 1394 interface, one of the plurality of source devices is selected and connected to the transmitter having the common IEEE 1394 interface. Also in this case, it is difficult to transmit the AV signals of a plurality of source devices connected to a common transmitter to a corresponding AV signal input device in one data packet.

An object of the present invention is to provide a transmitter, a receiver, and a transmission / reception system which can overcome the above-mentioned problems.

[0005]

The transmitter (10) of the present invention has the following (a) to (d). (A) A plurality of AV input units (12) to which AV signals from a plurality of source devices are input (b) Predetermined data is added to each AV signal input to each AV input unit (12) to add data A data adder (24) for generating a signal; and (c) a data block forming means (26) for combining data add-on signals related to AV signals output at substantially the same time in each source device into one data block (26) ( d) A data block in one isochronous cycle is divided into one data packet by an IEEE 1394 transmission line (2
Data block output unit (18) to output to (0)

[0006] In the present specification, the AV signal means an audio signal and / or a video signal. That is, A
The V signal means only an audio signal or only a video signal, and includes both mixed signals. The AV signal input from the IEEE 1394 to the AV input unit (12) may be not only an analog signal but also a digital signal. If the signal is an analog signal, the signal is converted into a digital signal by an AD converter. If the signal is a digital signal, the AD converter is omitted.

The additional data added by the data adder (24) may be of any type as long as it is added data. For example, (a) when the number of bits of the IEEE 1394 transmission line (20) is larger than the number of bits of the AV signal input to the data adder (24), bit alignment (padding: p
a predetermined digit “0” to be added for
Or (b) the IEEE 1394 transmission path (20) has a bit number of I
More than the number of bits of the audio signal of EEE1394,
When using the surplus bits for label insertion,
Think of it as additional data.

[0008] Each AV signal from each source device is converted by the data adder (24) into a data addition signal to which additional data has been added. As the data addition signal, those related to the AV signals output at substantially the same time in each source device are combined into one data block by the data blocking means (26). Data blocks in one isochronous cycle are output from the data block output unit (18) to the IEEE 1394 transmission line (20) by one data packet. In this way, the AV signals related to a plurality of source devices are carried in one data packet, and the
E1394 transmission line (20)
The efficiency and convenience of the EEE1394 transmission line (20) can be improved.

The receiver (30) of the present invention comprises the following (a) to
(E). (A) A predetermined data packet is transmitted over an IEEE 1394 transmission path.
(20) Data block input unit (32) taken in from (20) (b) A data addition signal relating to an AV signal output at substantially the same time in each source device by inputting a data packet input at data block input unit (32) 1 each other
Data block separating means (34) for separating the data blocks into one data block; (c) data additional signal extracting means (40) (d) for extracting a data additional signal relating to an AV signal of a predetermined source device from the data block An additional data remover (42) for removing additional data from the data additional signal selected by the data additional signal extracting means (40); (e) an AV signal based on the output of the additional data remover (42) to an AV signal input device AV output unit for output (38)

The data block input unit (32) receives a predetermined data packet from the IEEE 1394 transmission line (20). The fetched data packet is separated by the data block separating means (34) into data blocks in which the data addition signals relating to the AV signals output at substantially the same time in each source device are combined into one. The data addition signal extraction means (40) extracts a data addition signal related to the AV signal of one predetermined source device from the data block. The extracted data additional signal is subjected to additional data removal in an additional data remover (42), and the AV signal from which the additional data has been removed is output from an AV output unit (38) to an AV signal input device. Thus, the AV related to a plurality of source devices
A predetermined A from the data packet transmitting the signal together
The V signal can be extracted and output to an AV signal input device.

The receiver (30) of the present invention has the following (a) to
(E). (A) A predetermined data packet is transmitted over an IEEE 1394 transmission path.
(20) Data block input unit (32) taken in from (20) (b) A data addition signal relating to an AV signal output at substantially the same time in each source device by inputting a data packet input at data block input unit (32) 1 each other
Data block separating means (34) for separating the data blocks into a single data block (c) A
A plurality of data addition signal extraction means for extracting a plurality of data addition signals relating to the V signal; and (d) a plurality of data addition signals for removing additional data from each data addition signal extracted by each data addition signal extraction means. Additional data remover (42) (e) A plurality of AV output units (38) for outputting an AV signal based on the output of each additional data remover (42) to an AV signal input device

The data block input section (32) receives a predetermined data packet from the IEEE 1394 transmission line (20). The fetched data packet is separated by the data block separating means (34) into data blocks in which the data addition signals relating to the AV signals output at substantially the same time in each source device are combined into one. The data addition signal extracting means (40) extracts a plurality of data addition signals related to the AV signal of another predetermined one source device from the data block. Each of the extracted data additional signals is subjected to additional data removal in an additional data remover (42), and each AV signal after removal of the additional data is output to each AV output unit.
(38) is output to each AV signal input device. Thus,
An AV signal relating to a plurality of source devices can be output to each AV signal input device from a data packet transmitting the AV signals relating to a plurality of source devices together.

The transmitting / receiving system (50) of the present invention comprises the following (a)
And (b). (A) The above-mentioned transmitter (10) (b) The above-mentioned receiver (30)

According to another transmission / reception system (50) of the present invention, one or a plurality of transmitters (10) and one or a plurality of receivers (30) are further arranged in series on an IEEE 1394 transmission line (20). Has been established.

The number of the transmitter (10) and the number of the receivers (30) connected to the IEEE 1394 transmission line (20) are not limited to one, but include a plurality of each.

According to another transmission / reception system (50) of the present invention, a transmitter (10) and a receiver (30) constituting the same node
including.

One node includes a transmitter (10) and a receiver (3
0) and may be both the transmitter (10) and the receiver (30). For example, the MD player is 1
Of the transmitter (10) and the receiver (30) constituting the number of nodes
Connected to the input unit (12) and AV output unit (38).
An AV signal input device that outputs an audio signal to a source device to which an audio signal is input from the V output unit (38) and to the AV input unit (12) during reproduction.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of the transmitter 10. The transmitter 10 includes a plurality of transmitters A in order from the input side to the output side.
D converters 12-1 to 12-n, IEEE 1394 format converter 14, transmission buffer 16, and IEEE 1394 transmission unit
18 in the IEEE 1394 transmission unit 18
It is connected to the 1394 bus 20. Analog audio signals AA1 to AAn (stereo) from respective source devices such as a radio tuner and a CD player of an AV apparatus are input to corresponding A / D converters 12-1 to 12-n, and are converted to digital audio. It is converted into the audio signals DA1s to DAns.
The converted digital audio signals DA1s-DA1s-D
Ans is a serial signal. Also, the AD converter 12-1
The conversion timings, i.e., the sampling timings, in .about.12-n are the same. In the IEEE 1394 format converter 14, first, the serial-parallel signal converter 22 converts the signals DA1s to DAns into parallel signals DA1p to DAnp, respectively, and adds the additional data in the next data adding circuits 24-1 to 24-n. Then, data addition signals DT1p to DTnp are written in the transmission buffer (RAMrx) 16 in the order of DT1p to DTnp. At this time, the audio signals having the same sampling timing are separated by the data control circuit 26 into one.
It is managed as one data block DB.

The additional data added in the data adding circuits 24-1 to 24-n is, for example, 32 bits in the IEEE 1394 bus 20 according to the rules.
The parallel signals DA1p to DAnp input to 24-n are 3
When the number of bits is less than 2 bits, a predetermined digit "" is added for padding.
0 "and IEEE1394 audio signals are usually 24
Since this is a bit, eight bits are left over when it is put on the IEEE 1394 bus 20, and this is a label when this is used for label insertion.

As an example, sampling timings in the AD converters 12-1 to 12-n are n1 to nx, and data sampled at the timing n1 is DT1p (n1) to DT1p (n1).
DTnp (n1), data sampled at timing n2 is DT1p (n2) to DTnp (n2), and data sampled at timing nx is DT1p (n
x) to DTnp (nx), and the data blocks corresponding to the respective timings are DB (n1) to DB (nx).
Is defined as follows: DB (n1) = DT1p (n1) to DTnp (n1) DB (n2) = DT1p (n2) to DTnp (n2) DB (nx) = DT1p (nx) to DTnp (nx)

In the IEEE 1394 transmission unit 18, the IEEE 1394 transmission unit 18
According to the timing of Isochronous (isochronous) transfer specified in 1394, 1-Iso
The data blocks on the transmission buffer 16 are combined into a data packet DP for each channel, and a signal necessary for isochronous transfer is added to this DP, and an
IEEE13 as a digital data packet ISDTa
It is sent to the 94 bus 20.

As an example, assuming that the number of data blocks accumulated during the Isochronous timing (m-1 to m) is n, the IEEE1394 bus 20 is connected to the next Isochronous timing (m to m + 1). Shed
The data packet ISDTa (m) is as follows. DP (m) = DB (n1, m) + DB (n2, m) +... + DB (nn, m) ISDTa (m) = H + DP (m) + CRC where H is the audio data packet. Header, CRC
Is a data error correction code.

In this way, in the transmitter 10, AV signals (stereo) from a plurality of source devices are divided into data blocks at the same sampling timing in the AD converter 12, and further, data blocks within one isochronous cycle of IEEE 1394. IE in one packet
The data is transmitted from the IEEE 1394 transmission unit 18 to the IEEE 1394 bus 20.

FIG. 2 is a configuration diagram of the receiver 30. IEEE
The 1394 bus 20 is connected in order from the input side to the output side,
E1394 receiving unit 32, receiving buffer 34, IEEE13
A 94 format inverse converter 36 and a DA converter 38 are provided. The DA converter 38 is connected to an audio signal input terminal of the AV signal input device, and the AV signal input device is, for example, a speaker. An MD player, a cassette tape player, or the like becomes IEEE1394 during reproduction, but becomes an AV signal input device during recording, and has an input terminal connected to the DA converter 38 for recording. IEEE 1394 receiver 32
Are various data flowing on the IEEE 1394 bus 20.
Of the desired audio data packet ISD
Take out Ta. Then, the signal (header or CRC of the packet) added by the isochronous transfer is removed, and the signal is written to the receiving buffer (RAMtx) 34 as a DP signal. For example, an audio data packet ISDT
When a (m) is received, data blocks DB (n1, m) to DB (nn, m) are written in the receiving buffer 34. By repeating this operation for every 1-isochronous, the same data as the transmitting side is always received on the receiving side buffer 34.

In the next IEEE 1394 format inverse converter 36, the desired audio data is selected by the data selection circuit 40 from the data block DB on the receiving buffer 34.
The data DTxp is extracted, and the data added by the data adding circuit 24 of the IEEE 1394 format converter 14 of the transmitter 10 is removed by the next additional data removing circuit 42, and is converted into the original parallel audio signal DAxp. Then, the signal is converted into a serial audio signal DAxs by the next parallel-serial signal converter 44. For example, if the parallel audio signal DT2p is selected, a serial audio signal DA2s is output at the output.

The selected and output DAxs signal is
The A-converter 38 returns the analog audio signal AAx to the original one.

[0027] Thus, the receiver 30 has the IEEE 139
From the data packet sent from the transmitter 10 via the 4 bus 20, a data block in which the same sampling timing is put together is separated, and a predetermined IEEE 1394 audio signal is extracted from the data block. It can be output as an analog audio signal from the DA converter 38 to an AV signal input device such as a speaker.

FIG. 3 is a configuration diagram of another receiver 30. FIG.
The same parts as those of the receiver 30 are indicated by the same reference numerals, and differences will be described. In the receiver 30 of FIG. 3, the DA converter 38, the additional data removal circuit 42, and the parallel-serial signal converter 44
The number of DA converters 38-1 to 38-n equal to the number of audio signals from each source device included in a group of data blocks in the data control circuit 26 of the transmitter 10,
The additional data removing circuits 42-1 to 42-n and the parallel-serial signal converters 44-1 to 44-n are used. The data selection circuit 40 decomposes the plurality of data addition signals combined as a data block into individual data addition signals, and distributes each data addition signal to the additional data removal circuits 42-1 to 42-n. Thus, all the IEEEs included in the data packet
The 1394 audio signal can be output from the DA converters 38-1 to 38-n to the corresponding AV signal input devices.

FIG. 4 is a configuration diagram of a transmission / reception system 50 in which a plurality of (x) transmitters 10 and a plurality (y) receivers 30 are serially connected by an IEEE 1394 bus 20. FIG.
Then, the transmitter 10 and the receiver 30 are respectively IEEE13
It is a node of the transmission system 94 and can be connected and disconnected as appropriate. In this way, it is possible to construct the transmission / reception system 50 in which the transmitter 10 and the receiver 30 are 1: plural, plural: 1, and plural: plural. Each receiver 30 can independently select a data packet to be received and an audio signal included therein. In the IEEE 1394 transmission system, one node can also serve as both the transmitter 10 and the receiver 30.
The connection point of the IEEE 1394 transmission unit 18 of the transmitter 10 and the connection point of the IEEE 1394 reception unit 32 of the receiver 30 can be shared.

In the transmitter 10 and the receiver 30 in the drawing,
Although the data packet of the audio signal is transmitted and received via the IEEE 1394 bus 20, it is also possible to transmit and receive a video signal and a mixed signal of audio and video.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transmitter.

FIG. 2 is a configuration diagram of a receiver.

FIG. 3 is a configuration diagram of another receiver.

FIG. 4 is a configuration diagram of a transmission / reception system in which a plurality of transmitters and receivers are serially connected by an IEEE 1394 bus.

[Explanation of symbols]

Reference Signs List 10 transmitter 12 AD converter (AV input unit) 18 IEEE 1394 transmission unit (data block output unit) 20 IEEE 1394 bus (IEEE 1394 transmission line) 24 additional data addition circuit (data addition unit) 26 data control circuit (data blocking unit) Reference Signs List 30 receiver 32 IEEE 1394 receiving unit (data block input unit) 34 receiving buffer (data block separating unit) 38 DA converter (AV output unit) 40 data selection circuit (data additional signal extracting unit) 42 additional data removing circuit (addition) Data remover) 50 Transmission / reception system

Claims (6)

[Claims] 1. (a) a plurality of AV input units (12) to which AV signals from a plurality of source devices are input; and (b) predetermined data for each AV signal input to each of the AV input units (12). A data adder (24) for generating a data addition signal by adding
(C) data block forming means (26) for combining data addition signals relating to AV signals output at substantially the same time in each source device into one data block, and (d) a data block in one isochronous cycle Is transmitted by one data packet to the IEEE 1394 transmission path (2
A data block output unit (18) for outputting the data block to a data block (0). 2. (a) A predetermined data packet is transmitted by IEEE
Data block input unit to take in from 1394 transmission line (20)
(32), (b) combining the data packets input at the data block input section (32) into one data addition signal relating to the AV signal output at substantially the same time in each source device; Data block separating means (34) for separating data blocks into existing data blocks; (c) data additional signal extracting means (40) for extracting a data additional signal relating to an AV signal of a predetermined source device from the data block; An additional data remover (4) for removing additional data from the data additional signal selected by the additional signal extracting means (40).
2) and (e) an AV output unit (3) for outputting an AV signal based on the output of the additional data remover (42) to an AV signal input device.
8), a receiver characterized by having: 3. (a) A predetermined data packet is transmitted by IEEE
Data block input unit to take in from 1394 transmission line (20)
(32), (b) combining the data packets input at the data block input section (32) into one data addition signal relating to the AV signal output at substantially the same time in each source device; Data block separating means (34) for separating data blocks into data blocks, and (c) a plurality of data added signal extracting means for extracting a plurality of data added signals relating to AV signals of different source devices from the data blocks, respectively.
(40), (d) a plurality of additional data removers (42) for removing additional data from each data additional signal extracted by each data additional signal extraction means (40), and (e) each additional data remover ( A receiver comprising: a plurality of AV output units (38) for outputting an AV signal based on the output of (42) to an AV signal input device. 4. A transmission / reception system comprising (a) the transmitter (10) according to claim 1 and (b) the receiver (30) according to claim 2 or 3. 5. The system according to claim 4, wherein one or a plurality of said transmitters (10) and one or a plurality of said receivers (30) are arranged in series on an IEEE 1394 transmission line (20). The transmitter described. 6. The transmitter (10) constituting the same node
6. The transmission / reception system according to claim 5, further comprising a receiver and the receiver.