JP2003059192A - Disk reproduction system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproduction system that allows a read section to reproduce audio data recorded on a disk such as a DVD(digital video disc) without violation of the standards and transmits the reproduced audio data to a receiver side. SOLUTION: A data distributor 15 is provided to a DVD player side, transmits both L/R data as one frame comprising odd and even number lines alternately through two interface lines (cables) 24, a receiver side data arrangement device 20 arranges the data and outputs the data at a high rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing system, for example, a disc reproducing system for reproducing digital audio data recorded on a recording medium such as a DVD (Digital Video Disk).

[0002]

2. Description of the Related Art Conventionally, recording and reproduction of audio and video have been performed mainly by using a magnetic tape. However, since such a magnetic tape is a sequential recording system, it is necessary to sequentially perform reproduction (reading), and there is a drawback that random reproduction cannot be performed. As a recording means that solves the above-mentioned drawbacks of the sequential recording / reproducing method using a magnetic tape or the like and enables random access, the above-mentioned DVD or CD (Compac
A music / video recording / reproducing device using a t Disc) has been developed and put into practical use.

Conventionally, a sampling rate (sampling or digitizing speed) higher than 48 kHz, for example, in a DVD.
A case where digital data is reproduced and output from a digital device for which is set will be described with reference to FIGS. 5 and 6. FIG. 5 shows a linear PCM 96 in a DVD reproducing device.
The operation during k-disk playback is shown. On the other hand, FIG. 6 shows transmission in dual (mono) mode.

First, in FIG. 5, the disc reproducing apparatus comprises a linear PCM 96k audio disc 31, a reading section 32, a 48k digital filter 33, a rate converter 34, a changeover switch 35 and an interface transmitter (TX) 36.

The operation of the disc reproducing apparatus shown in FIG. 5 will be described. Of the information read from the linear PCM 96k audio disc 31 by the reading unit 32, it is determined whether the disc is a linear PCM 96kHz or not by referring to TOC and navigation. To do. When the reading unit 32 determines that the output is linear 96 kHz, the output is
It is input to the 48k digital filter 33. And
(Sampling) 48kH by rate converter 34
Switch 3 converted to z rate and switched to H side
The TX 36 outputs a digital output at a rate of 48 k through the signal 5. As a result, as shown in the timing chart on the right side of FIG. 5, the left channel signal L and the right channel signal R are
, L0-R0 is L0 �, L1-R1 is R0 �,
L2-R2 is converted into L1 �, L3-R3 is converted into R1 � On the other hand, in the case of a signal of 48 kHz, the reading unit 32 does not switch the switch 35 to the H side and is directly sent to the TX 36 and output.

Further, in the device in which the dual mode (mono mode) shown in FIG. 6 is set, the linear PCM 96k
The audio data read by the reading unit 32 from the audio disc 31 is distributed to the L (left signal) only and the R (right signal) only by the L / R data distributor 37, which is half the rate of the 96k stereo data (48kH).
z). And the sorted data is
Two signal lines with the same bit rate as 48 kHz stereo are used to transmit by independent TX 36A and 36B for Lch (left channel) and Rch (right channel), and 96 kHz data transmission is realized. . This state is shown in the timing chart on the right side of FIG.

[0007]

According to the above-mentioned conventional technique, there are the following problems. That is, 96 kH
It is technically possible to output z-data, but the device is expensive. In addition, since the channel status is set only up to 48 kHz according to the interface standard (for example, EIAJ and CP-340 standard, etc.), the receiving side amplifier (amplifier) and recording equipment are also supported except for some commercial equipment. There is nothing to do. Further, in the disc reproducing device shown in FIG. 5, the component of 24 kHz or higher originally included in the source is not reproduced due to the sampling theorem. Further, in the disc reproducing device shown in FIG. 6, only monaural operation is lost when the disc reproducing device is connected to a device having only a general receiver configuration. Further, the signal component of 24 kHz or more is reproduced as aliasing noise.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a disc reproducing system adopting a data transmission system of a disc reproducing device which enables high quality reproduction without violating the standard. The purpose is to provide.

[0009]

In order to solve the above-mentioned problems, the disc reproducing system according to the present invention adopts the following characteristic structure.

(1) In a disk reproducing system in which audio data recorded on a linear PCM 96 kHz audio disk or the like is read and reproduced by a reading unit and transmitted to a receiver such as an amplifier, the audio data read by the reading unit is a data sorter. A disk reproducing system in which both L / R data are set as one frame, and the frames are sequentially distributed to two transmission lines by alternating odd numbers and even numbers.

(2) The disc reproducing system according to the above (1), in which the receivers receive the two systems of interfaces distributed by the data distributing unit, and the distributed distribution data thus obtained are aligned by a data aligner.

(3) The disc reproducing system according to the above (1) or (2), in which a control line which is connected independently of the interface is provided and it is discriminated that a sortable device is connected.

(4) One of the two transmission lines is used as a dedicated interface so that only predetermined devices can be connected, and information such as the start of distributed transmission is superimposed on the voice data for transmission. Disc playback system.

(5) The disc reproducing system according to any one of (1) to (4), wherein the transmission line and the control line are combined into one composite interface line.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of a preferred embodiment of a disc reproducing system according to the present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 1 is a configuration block diagram showing a first embodiment of a disc reproducing system according to the present invention.
2 is a timing chart thereof. In the data transmission system of this disc reproducing device, 96 kHz linear PCM audio data is digitally transmitted to a DVD player and an amplifier (amplifier) with an interface receiver. The data transmission system of this disc reproducing device is a linear PCM 96k audio disc 11, a reading unit 12, 48.
k Digital filter 13, switches 14, 16, data distributor 15, DVD player side including a pair of interface transmitter (TX) 17 and corresponding device detector 18, interface receiver (RX) 19, data aligner 20, distributor Detector 21 and switch 22
, A control line (inter-device control line) 23 for connecting the DVD player side and the receiver side, and two standard digital interfaces (48 kHz rate × 2) 24.

First, the reading unit 12 detects that the inserted disk 11 is a linear PC by TOC or navigation.
It is determined whether the sound is M96 kHz sampling sound. If the reading unit 12 determines that the sound is linear 96 kHz sampling, the switches 16A and 16B are set to H level.
Switch to the side. In this way, the audio data output by the TX 17A and 17B is output by the data distributor 15.
Data that is divided into two systems, odd frame data and even frame data, is selected for each frame. Then, RX1 on the receiver side is transmitted via the respective TX 17A, 17B and digital interfaces 24A, 24B.
It is sent to 9A and 19B.

Furthermore, the corresponding device detection unit 18 causes the DV
It is determined whether or not the device connected to D can reconstruct the data sequence distributed to the two systems. If it is determined that the 48k digital filter 13 can be reconfigured, the switch 14 is switched to the H side to bypass the 48k digital filter 13 (bypass).

Next, the receiver side will be described. RX
19A and 19B receive the data string output from the DVD player side via the inter-device control line 23. The data aligner 20 rearranges the two received data strings. The distribution detection unit 21 determines whether or not the transmitted data is the distributed data of 96k rate. When the distribution detection unit 21 detects distribution transmission,
The switch 22 is switched to the H side, and the D / A (digital-
The data string sent to the analog converter is passed through the data aligner 20.

The control line 23 and the two digital interface lines 24A and 24B may be provided separately. Further, the control line 23 and the interface lines 24A and 24B may be integrated into one composite interface line. This makes it easier to handle the interface line.

Next, FIG. 3 is a system configuration diagram showing a second embodiment of the disc reproducing system according to the present invention.
FIG. 4 is a timing chart thereof. In FIGS. 3 and 4, the same reference numerals are used for the components corresponding to the components shown in FIGS. 1 and 2 for convenience of description.

Also in the disc reproducing system of the second embodiment, the linear PCM 96 kHz audio disc 11, the reading unit 12, the 48 kHz digital filter 13, the switches 14, 16A and 16B, the data distributor 15, the pair of TX17A, are provided on the DVD player side. 17B and a corresponding device detection unit 18 are included. On the receiver side, a pair of R
It includes X19A, 19B, a data aligner 20, a sorting detector 21, and a switch 22. But DVD
Between the player side and the receiver side, one dedicated interface line (or cable) 25 and one general (or standard) interface line (or cable) 26 are provided.

As described above, one of the two interface cables is used as the dedicated interface cable 25, and the information such as the start of distribution transmission is superimposed and transmitted together with the voice data. With this configuration, the inter-device control line used in the above-described first embodiment is eliminated, the connection is simplified, and the possibility that an odd line and an even line are misconnected is eliminated. For example, the connection on the odd frame side is the dedicated interface cable 25, and the connector has a specific configuration.

In each of the above-described embodiments, the compatible device detecting section 18 may detect the termination on the receiver side. Alternatively, a DC bias may be applied to the input section on the receiver side, and the reproducing apparatus (DVD player) side may detect the DC bias at the time of connection. In that case, it is not necessary to use a dedicated interface, and a general (standard) interface can be used. Furthermore, the distribution detection unit 21 may use user bits instead of channel data. Further, the distribution detection unit 21 may apply a DC bias to the interface output on the player side and detect it on the receiver side.

[0025]

As can be understood from the above description, according to the disc reproducing system of the present invention, the following remarkable practical effects can be obtained. First, in the case of connecting only in-house equipment, a digital signal of 96 kHz sampling rate of a disc such as a DVD can be transmitted to the receiver side such as an amplifier without violating the standard, and the reproduction quality can be improved. . Further, since the transmission rate is 48 kHz or less, the conventional device can be used for the input / output unit. Even when it is connected to a general device having a reception function up to 48 kHz, it functions without any problem because the filtered and thinned data is transmitted. Furthermore, if the number of distributions and the number of transmission lines are increased, DVD audio 192k
48/4 set by the interface standard such as Hz
Data transmission at an integer multiple rate of 4.1 / 32 kHz is possible.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing a first embodiment of a disc reproducing system according to the present invention.

2 is an operation timing chart of the embodiment shown in FIG. 1. FIG.

FIG. 3 is a system configuration diagram showing a second embodiment of a disc reproducing system according to the present invention.

FIG. 4 is an operation timing chart of the embodiment shown in FIG.

FIG. 5 is an explanatory diagram of a conventional disc reproducing system.

FIG. 6 is an explanatory diagram of a conventional disc reproducing system.

[Explanation of symbols]

11 linear PCM 96 kHz audio disk 12 reading unit 13 48 kHz digital filter 14, 16A, 16B, 22 switch 15 data distribution unit 17A, 16B interface transmitter (T
X) 18 Compatible device detection unit 19A, 19B Interface receiver (RX) 20 Data aligner 21 Distribution detection unit 23 Control line 24A, 24B Digital interface cable 25 Dedicated interface cable 26 Standard interface cable

Claims (5)

[Claims] 1. A reading unit reads and reproduces audio data recorded on a linear PCM 96 kHz audio disk or the like,
In a disc reproducing system for transmitting to a receiver side such as an amplifier, the audio data read by the reading unit is input to a data distributor, and both L / R data are set as one frame, and the frames are sequentially transmitted to two lines of an odd number. And a disc playback system characterized by transmitting evenly distributed. 2. The data distributed by the data distribution unit
2. The disc reproducing system according to claim 1, wherein the system side interface is received by the receiver side, and the obtained sorted reception data is aligned by a data aligner. 3. The disc reproducing system according to claim 1, wherein a control line which is connected independently of the interface is provided to determine that a sortable device is connected. 4. One of the two transmission lines is used as a dedicated interface so that only a predetermined device can be connected, and information such as the start of distribution transmission is superimposed on the voice data for transmission. Item 1. The disc reproducing system according to Item 1. 5. The disc reproducing system according to claim 1, wherein the transmission line and the control line are combined into one composite interface line.