JPH03183065A - Cd-i player - Google Patents

Abstract

PURPOSE:To access plural channels on a disk and to simultaneously take out contents by reading signals recorded to the plural channels, afterwards distributing these signals to the respective channels and forming the distributed signals to data by using a decoder. CONSTITUTION:When a user designates a disk 12 recording sightseeing guide data corresponding to the course of a sightseeing boat, a motor 14 is rotated by a read control part 10 and an optical pickup 16 starts reading. Signals show ing sightseeing guidance in a read data area 36 are converted into analog signal, successively sent to a digital processing part 38, converted into digital signal in this part 38, sent to a distributing circuit 44, controlled by a microprocessor 42 and distributed to the respective channels. Afterwards, respective decoders 46 taking charge of the respective channels convert the read digital signals to analog signals by a D/A converter 60 and the signals are outputted as sound signals from a speaker 68 through a buffer amplifier 62 and a low-pass filter 64.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides an AD-PCM (adaptive
Delta-Pulse Code Modulati
A CD that plays back signals recorded using the on) method.
1 (Compact Disk-Interactive
e) Regarding the player, the -layer details relate to a CD-I player that allows data to be read in units of designated channels.

(Background Art) For example, when providing tourist information on a sightseeing boat floating on a lake, there is a device that allows foreign tourists to hear the information in their native language.

In addition, multi-channel BGM (Back Grou
nd Music) There is a system similar to cable broadcasting.

The above-mentioned tourist information devices and cable broadcasting players have recording tapes and players for playing recording tapes for each language or each channel, and the equipment is large-scale. While researching a means of extracting data stored in multiple channels without using this large-scale device, the inventor discovered that
We have come to propose the use of act Disk (CD). For example, a CD-A (Compact Disk-A) records information corresponding to music sequentially on one track and accesses the information at random.
There is a method called Audio. In a CD-A, music information is recorded as a 16-bit signal in an area called a frame on a track for each song. Each frame is sequentially arranged in one channel (ch) on the track. In the case of CD-, PCM is used as the signal processing method.
(Pulse C.

de Modulation) method is used.

However, when the AD-PCM method is used as a signal processing method, it is possible to increase the amount of information that can be recorded and the number of channels by recording information in 8 bits or 4 bits. For example, a 16-bit stereo CD-
With A, the music recording time is 1 hour per channel (actually 7 hours).
For example, when recording 4-bit monaural music, it is now possible to record 8 channels (ch) and up to 8 hours.

This system was called CD-1, and a standard was finalized in February 1986, and functional specifications were established in 1987. However, in the conventional CD-1 player, even if there are many channels, access is only made sequentially starting from one channel.

The present invention was made by focusing on the multiple channels of CD-I, and is a CD-I that can access multiple channels simultaneously.
The purpose is to provide an I-player.

(Means for solving problems) In order to achieve the above object, the present invention has the following configuration.

That is, a distribution unit is provided for each channel, and a distribution unit is provided for each channel and distributes the read and digitized signal recorded in a plurality of channels on a disc using the AD-PCM method. The present invention is characterized by comprising a decoder that converts the signal distributed by the distribution section into data.

(effect) The effect will be explained.

The recorded signal is distributed to each channel by the distribution section. Therefore, the user can retrieve data from multiple channels at the same time.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, a player (playback device) of a device for simultaneously providing sightseeing guide information for sightseeing boats in eight languages will be described as an example.

FIG. 1 shows the block diagram of the CD-1 player of this embodiment.

Reference numeral 10 denotes a reading/control unit, which controls the motor 14 that rotates the disk 12 and controls the optical pickup 16 that reads signals recorded on the disk 12.
- Perform the rules. The signal read out by the optical pickup 16 is a high frequency analog signal. Here, the signals recorded on the disk 12 will be explained with reference to FIG. Third
The figure shows an outline of the track 18 on which signals are recorded, and it is actually formed in a spiral shape on the surface of the disk 12. A lead-in area 20 and a lead-out area 22 are provided at the beginning and end of the track 18, respectively, indicating the beginning and end of the track 18. After the lead-in area 20, a system reserve area 24, a disk label area 26, a path table area 28, and a directory area 30 are arranged, and these areas are
This is a system area occupied by the D-r player's system. After the system area is the index area 32
, a name file area 34, and a data area 36 are arranged. These areas are called program areas and are areas that users can use freely. In the index area 32, physical addresses and the like are recorded for each signal in a data area 36, which will be described later, for each unit (for example, one tourist guide for each content and language). In the name file area 34, identification codes of signals for each unit in the data area 36 are recorded. The signal in the data area 36 (signal indicating the content of recorded data) is recorded by AD-PCM signal processing.
The internal time is divided into 8 channels. In other words, in the diagram showing the first part 36a of the contents in the data area 36 in FIG.
The numbers 8 to 8 indicate each channel, and this is a recording method in which one channel of data can be obtained by reproducing only the signal corresponding to, for example, rl. Therefore, among the analog signals output from the reading/control section 10, the signals corresponding to the data area 36 are outputted sequentially. Table 1 shows the language assignment for each tourist information channel in this embodiment.

Table-1 In Figure 1, 38 is a digital processing section, which reads and
The sequential analog signal sent from the control unit IO is subjected to noise removal, phase correction, etc., and converted into a digital signal.

40 is a distribution section, which consists of a microprocessor 42 and a distribution circuit 44 controlled by this microprocessor 42. The contents of the data area 36, which have been sequentially converted into digital signals, are sent to the distribution circuit 44 from the digital processing section 38. The microprocessor 42 distributes this digital signal to each channel.

46 are decoders, one for each channel, which decodes the signal of the assigned channel sent from the distribution circuit 44 of the distribution section 40. The block diagram of this one-channel decoder 46 is shown in the second block diagram.
As shown in the figure.

In FIG. 2, 48 is a control circuit, and the distribution circuit 44
The digital signals for channels sent sequentially are converted into parallel signals and sent to the digital signal processor 50. A in the digital signal processor 50
D-PCM is decoded to create parallel digital audio signals.

After the digital audio signal generated by the digital signal processor 50 is temporarily stored in the memory 52, it is sent to the parallel-to-serial conversion circuit 54, where the digital audio signal is rearranged from parallel to serial (sequential) signals again. In addition, 56 is a select circuit, which is a circuit for determining whether or not the disc 12 is for CD-■.
8 is a time division circuit, which synchronizes the distribution circuit 44 and the control circuit 48.

The explanation will be given again by returning to the block diagram in FIG.

60 is a digital-to-analog converter (D/A converter), one for each channel, which converts the digital audio signal from the decoder 46 into an analog audio signal.

62... is a buffer amplifier, which amplifies the analog signal output from each D/A converter 60...

64... are low-pass filters, one for each channel, and are filter circuits for extracting only necessary low frequency components from the outputs from the D/A converters 60...

66 are also buffer amplifiers, which amplify the audio analog signals that have passed through the respective low-pass filters 64 to a predetermined level. Note that the D/A converter 60..., the buffer amplifiers 62...66..., and the low-pass filter 64... constitute an acoustic signal conversion circuit. This acoustic signal conversion circuit is a circuit for extracting the signals recorded on the disk 12 as audio signals such as voices. , when printing on a printer, it is replaced with another output circuit.

68 is a speaker which is an example of sound output.

The speakers 68... each have a buffer amplifier 66...
・Connected to. Therefore, each speaker 68 can simultaneously output audio signals corresponding to each channel. The sound output means is not limited to speakers, but may also be earphones, phone headphones, or the like.

Next, the operation of the CD-I player configured as described above will be explained.

The sightseeing boat guide device using the CD-1 player of this embodiment has tourist information data corresponding to the route of the pleasure boat.
- A disk 12 on which signals are recorded using the PCM method is set. When the user presses a start switch (not shown), the disk 12 is rotated by the motor 14 controlled by the reading/control unit 10, and the optical pickup 1
6 starts reading track 18 on disk drive 2. Disc 12 according to the information in lead-in area 20
61! is a CD-) disc! tv and the reading/control unit 1O controls the motor 14 and the like.

Signals indicating tourist information in the data area 36 read by the optical pickup 16 are sequentially converted into analog signals and sent to the digital processing section 38 one after another. The digital processing section 38 digitizes the analog signal and sends it to the distribution circuit 44 of the distribution section 40 . The sequential digital signal sent to the distribution circuit 44 is managed by the microprocessor 42, divided into signals for each channel, and each channel is sent to the target decoder 46 . This distribution is performed sequentially from channel 1 to channel 8, but because it is distributed at the speed of electrons, it appears to humans that the distribution is occurring simultaneously.

After being decoded by the decoder 46 into a digital signal indicating the content of the tourist information, the digital signal is converted by the D/A converter 60 into an analog signal indicating the audio signal, and then by the buffer amplifier 62... After being amplified, only the audio signal is taken out by a low-pass filter 64, and is amplified again to a predetermined level by a buffer amplifier 66.

At this stage, the audio signals of each channel are almost simultaneously reproduced into analog audio signals and output from the speakers 68 . . . at the same time.

If the user is Japanese, American, or French,
All you have to do is turn up the volume on channels 1, 2 and 7 to play tourist information in Japanese, English, and French, and turn down the volume on the other channels.

In that case, by increasing the distance between the speakers 68..., it is possible to prevent each other's voices from interfering with each other. In addition, speaker 68
If you use headphones instead of ..., you won't get in the way of each other's audio even if you're close.

In the case of CD-1, it is possible to record one hour for each channel, so for example, if you synchronize the tourist information content of all channels with the operation status and route of the pleasure boat, you can easily adjust the operation and timing of the pleasure boat. You can listen to the appropriate guidance in each language at the same time.

In the above-mentioned embodiment, an example was given in which the tour guide is provided in multiple languages, but in addition, for example, different music can be simultaneously broadcast on each floor of a department store. It can also be applied to simultaneous broadcasts of different movies and music for different seat classes on airplanes, and multi-channel sound in theaters. You can also mix multiple channels.
In addition to stereo broadcasting using multiple channels, for example, if the output of one channel is the sound of a small bird and the output of the second channel is the sound of a babbling stream, it is also possible to play a mixture of both channels. Furthermore, if it is used for one-man bus broadcasts and multiple channels are treated as one set of data for information on stops and the fees associated with the stops, it is possible to provide information on the stops and display the fees at the same time. In that case, the signal indicating the fare can be reproduced as a digital signal without using an acoustic signal conversion circuit and input to the display device, and the signal indicating the stop can broadcast the stop name via the acoustic signal conversion circuit. .

This distinction between signals indicating fares and signals indicating stops can be made possible by software support using a microcomputer.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments (of course, many modifications can be made without departing from the spirit of the invention). It is.

(Effects of the Invention) By using the CD-I player according to the present invention, it is possible to access a plurality of channels on a disc.

Therefore, it is possible to take out the contents of a plurality of channels at the same time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a CD-I player according to the present invention, FIG. 2 is a block diagram showing a decoder thereof, and FIG. 3 is an explanatory diagram showing the structure of tracks on a disc. 10...Reading/control unit, Engineering 2...Disk,
16... Optical pickup, 38... Digital processing section, 40... Distribution section, 46... Decoder,
60...D/A converter, 62...Buffer amplifier, 64...Low pass filter, 66...
・Buffer amplifier, 68...Speaker.

Claims (1)

[Scope of Claims] 1. A distribution unit that distributes signals recorded on a disc in a plurality of channels using the AD-PCM method, which are digitized after being read out, to each channel; and the channels. 1. A CD-I player, comprising: a decoder provided at each of the distribution sections for converting the signal distributed by the distribution section into data. 2. The CD-I player according to claim 1, further comprising an audio signal conversion circuit that converts the digitized data outputted from the decoder for each channel into analog and outputs it as an audio signal.