JPH03181087A - Disk player - Google Patents

Abstract

PURPOSE:To prevent mixture of noise due to communication and the degradation in quality of reproduced sounds by displaying the reproducing time of a musical program recorded on a disk based on time data generated in an operation part before the start of reproducing of the musical program. CONSTITUTION:A reproducing device part 6 consists of a control part 11, a microcomputer 12, a signal processing part 13, a mechanical part 14, etc., and an operation part 2 incorporates a control microcomputer 22 for signal control and operation, a TOC (table of contents) data memory 23, a muting circuit 25, and an amplifier 26 or the like. The reproducing time of the musical program recorded on the disk is displayed based on time data which is generated in the operation part 2 before the start of reproducing of the musical program based on TOC data sent from the reproducing device part 6 to the operation part 2 through a multicore cable 5a. Thus, mixing of noise due to communication and the degradation in quality of reproduced sounds are prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disc player, and in particular, a vehicle-mounted CD player in which an operating section such as a CD changer and a reproduction device section such as an amplifier or a speaker are separated from each other. This technology relates to a technology for preventing digital communication signals from being mixed into the playback sound in a disc player that is installed in a disc player and uses a single multicore communication cable to transmit operation signals and playback sound between the two. be.

[Conventional technology]

A typical in-vehicle CD player, as shown in Figure 2,
Broadly divided, an operation section 2 includes a plurality of operation buttons 3 and a display section 4.
, a playback unit 6 containing a CD magazine 7 and the like, and a single communication cable (multi-core cable) 5 for transmitting signals (operation signals and re/l sounds) between the two. The operating section 2 is installed near the driver's seat of the vehicle, and the reproducing device section 6 is often installed separately in the trunk or the like at the rear of the vehicle. This is because they cannot be placed nearby. There are two types of power source 0 (feeder wire): one built into the communication cable 5 and one provided separately. However, the digital communication wire between the operation section and the playback device section and the playback signal wire are placed inside this cable 5. It is stored.

The playback unit 6 is different from a normal CD player (for general home use), as shown in FIG. It has a built-in CD magazine 7, etc., which stores CDs 9 (also referred to as CDs) 9, and is configured to select and play one of the CDs in response to a user's push instruction from the operation button 3. .Specifically, the operation section 2
Both the reproduction device section 6 is equipped with a control microcomputer, and digital communication is performed between these microcomputers. The digital communication wire within the cable 5 transmits mechanical operation signals from the operation section 2 to the mechanical section of the playback device section 6, and information other than the playback sound of the CD 9 (TOC data, song information) from the playback device section 6 to the operation section 2. number data and elapsed time data), and this information is displayed on the display section 4. Furthermore, the reproduced sound from the CD 9 is amplified by an amplifier via a reproduction signal wire, and then outputted from speakers (not shown) (installed on the left and right sides of the operating section 2 or on the left and right sides of the front or rear of the vehicle).

[Problem to be solved by the invention]

By the way, in the conventional disc player 1 described above,
As mentioned above, since the digital communication wire between the operation section 1 and the playback device section and the playback signal wire are housed in the same cable 5, even if processing such as using shield wires is applied to each, the playback signal will not be connected to the playback signal. This often causes leakage of digital communication signals, which is often mixed into the reproduced sound as noise. In particular, since the time display data during playback uses the information on the CD disc, for example, the elapsed time and remaining time In order to display such information, it has conventionally been necessary to constantly supply time information, which has caused the problem that noise cannot be avoided. Therefore, if the CD player is constructed so as not to display the time during playback (as many CD players are), there is a drawback that the usability and operability become poor for the user.

[Means to solve the problem]

In the disc player of the present invention, the playback device section and the operation section are housed in separate casings, and communications such as transfer of operation signals and playback sound are performed between the two using a single multi-conductor cable. Various types of reproduced data are displayed on the display section provided in the operation section (in , the time during the playback of the performance song recorded on the disk is displayed before the playback of the performance song starts. The above problem is solved by displaying TOC data sent from the playback device to the operation unit via a multi-core cable and based on time data generated by the operation unit. It is constructed so that time display can be performed without mixing in noise due to communication.

〔Example〕

An embodiment of the disc player of the present invention will be described with reference to FIG. 1 and the like. FIG. 1 is a signal system diagram of the main parts of a disc player 10 of the present invention. In this figure, the same components as in FIG. 2 are given the same numbers.

As shown in FIG.
1. Microcomputer 12. Signal processing section 13. The CD magazine 7 is built into the mechanical section 14. The signal processing section 13 is equipped with a D/A converter, etc., and converts the digital audio signal detected and reproduced from the disk 9 into an analog signal, and outputs it to the operation section 2 via the reproduction signal wire 5a. 2 is a controller 1 to roll microcomputer 22 for signal control and calculation. TOC data memory 23. Muting circuit 25. It has a built-in amplifier (amplifier) 26, etc. The microcomputer 22 for this controller 1 is configured to exchange signals in both directions with the microcomputer 12 of the playback unit 60 size via the digital communication wire 5b, and the microcomputer 22 for the controller 1 is configured to exchange signals in both directions via the digital communication wire 5b. Indication signals from both 12 and 22 are sent via diodes DI and D2, respectively.

The display of the time (elapsed time, remaining amount time, etc.) during disc playback on the disc player IO is based on the TOC sent from the playback unit 6 to the operation unit 2 immediately before disc playback.
In other words, the elapsed time data in the disk is not used), and the noise generated by communication (serial communication of data) is eliminated from the playback. This is prevented by eliminating the need for communication between discs.Also, during fast-forward playback of discs, audio signals are transmitted intermittently, communications are performed when audio signals are not being transmitted, and time is displayed using disc data. 2 During fast-forward playback, which ensures correct display, only approximate sound information is originally played back, so there is no particular problem if the interval is shortened even during intermittent playback.

Muting of the playback signal occurs when there is no operation input to the control panel to stop playback, or when there is no longer a "signal indicating that playback is in progress" from the playback device (between songs, when all songs are finished, or when playback operation stops due to a problem. etc.), this is done by supplying the control i&II signal to the muting circuit 25. "
If the "signal indicating that playback is in progress" is provided as an independent signal line, its operation will be performed statically, so it will not be mixed into the signal line. Also, this signal can be transmitted directly or indirectly (
(via the microcomputer 22 in the operation unit 2) and the muting control unit (muting time 1!825). The microcomputer 22 in the operation unit 2 performs time display calculations when this signal indicates that playback is in progress.
This is because it takes some time until the reproduction start command is actually sent, the reproduction device section 6 enters the reproduction state, and the reproduction sound is generated from the speaker.

Next, an example of use and specific operation of the disc player of the present invention will be described with reference to the flowchart of FIG. 4 and the signal waveform diagram (timing chart) of FIG. 5. As a preliminary preparation, the CD machine 7 with the disk 9 set therein is loaded into the playback unit 6.

(1) Enter the disc number using the operating hand I3 of the operating section 2 (step ■), press PLAY-'r -3b (step At this point, the song number is specified.

■P1^Y key In response to manual input, the operation section 2 sends a reproduction command for the specified disc number to the reproduction device section 6 (step ■).

(After loading the specified disc, the playback section 6
First, the I' OC data recorded in the TOC information recording section is read out and stored in the memory within the microcomputer 12, and also transferred to the operation section 2. The operating section 2 receives the TOC information and stores it in the TOC data memory 23 (step 2).

0) The playback unit 6 plays the specified song (Step ■),
After transmitting the information on the playback order of the songs to the operation unit 2 (step ■), the controller 2 sets the playback raw signal line J to the playback state (for example, "L-Pa") together with the song start signal on the disc (step ■). , As a result, the serial communication shown in FIG. 5(B) is stopped (step 2).

(5) The operation unit 2 receives the +fj order information, checks that the "reproduction raw signal line" has become "L", and then cancels muting. See Figure 5 (^), step ■) A reproduced signal is output (see (C) in the same figure).

(5) At the same time, start counting the elapsed playback time (step (2)) and display the elapsed time and remaining amount time on the display section 4 according to the specified display mode.

l7) When one song finishes playing and there is a break between songs (step ■), the playback section 6 sets the "playback raw signal line" to "H", and in response to this, the operation section 2 applies muting (
Step @).

■During this time, the playback unit 6 will change the song number,
The data is sent to the operation unit 2 to enter the playback state, and the "refocus signal line" is set to "L".

■The operation unit 2 checks that the "refocus signal line" has become "L", cancels muting, and starts counting the elapsed playback time, and calculates the elapsed time and remaining amount according to the specified display mode. The time is displayed on the display section 4 (step 0).

■When the stop button 3a is pressed during playback of a disc, it stops (ST
OP) When operated (step [phase]), the operating section 2 applies muting (step ■) and sends a stop command to the playback section 6.

(When all 10 songs have been played (step ■), the playback section 6 sets the "refocus signal line" to "LI+," and in response, the operation section 2 applies muting.

Thereafter, the playback unit 6 notifies the operation unit 2 that the playback has ended (step o).

02) Even if some trouble occurs during playback (step 0) and the playback section 6 stops playing, the above steps (10)
Similarly, after muting is applied by setting the "refocus signal line" to "OFF", this is communicated to the operation unit 2, and a message indicating that a failure has occurred is displayed (step @).

Note that in the case of work (It) to 02), counting of the elapsed playback time is naturally also stopped.

0 When a pause operation is performed during playback (step [phase])
First, the operation section 2 performs the muting step■
), the count of the playback elapsed time is also temporarily stopped, and a pause command is transmitted to the playback unit 6. The reproducing unit 6 receives this and reproduces -
At the same time, the refocusing signal line J is set to “H”.
”.

(When an operation is performed to cancel playback-time stop,
The operation unit 2 sends a reproduction restart command to the reproduction unit 6. As a result, the reproducing section 6 enters the reproducing state and the "refocusing signal line" is set to "L".

05) In response to this, the operation unit 2 cancels the childbirth needing and restarts counting the elapsed regeneration time (step [phase]). In this case, the regeneration unit 6 switches the "refocus signal line J" to " Before setting it to “L”, set the elapsed time information to
The operation section 2 may be configured to receive the information and set the content of the playback elapsed time.

Next, the time calculation method will be explained with reference to Table 1. Table 1 is an example of information on the CD disc.

In this table, Prog, No. (program number) is the mountain number, and Index (index) NOl is the number that divides the program into small sections, with 00 being between songs, and 01 and above being numbers between songs. It represents the inside. Note that there are cases where it is divided into 02.03 and cases where it is not. P and time indicate the elapsed playback time within each program, and are displayed in minus numbers between songs. In addition, A and time include the gap (therefore, the sum of P and time is not equal to 8]) and indicates the elapsed time from the beginning of the disc.

(1) Display of the elapsed time of the song currently being played "The elapsed time from when the playback raw signal j became the playback state is measured by the microcomputer 22 of the operation unit 2 from the time P and is displayed. Displayed in section 4.

■Display of the remaining time of the song currently being played Subtract the elapsed time obtained in step (1) above from the total time data of the song currently being played stored in the TOC data memory 23 of the operating section 2. The remaining amount time is obtained and displayed on the display section 4.

(Displays the remaining time of the entire disc. T stored in the TOC data memory 23.

From the C data, the total playing time of the entire disc (■1),
Calculate the sum (ET) of the playing times of the songs that have been played up to now, and subtract the elapsed time obtained in step (1) from the result of (TTi (ET) to obtain the remaining time. to be displayed.

(4) Display of remaining time in songs whose playback order has been programmed Calculate the total playing time (TT) of the programmed songs and the sum (ET) of the playing time of each assistant who has finished playing up to the present, and (
The elapsed time obtained in operation (1) is further subtracted from the subtraction result of 0)=(FT) to obtain the remaining time, which is displayed on the display unit 4.

Note that the remaining time for tasks (3) and ('l) can also be determined by adding the total performance time of unplayed songs and the remaining amount of time obtained in task (2). In addition, the above-mentioned “playback raw signal (
"till signal)" has the above Index No. 00.
You can make it depending on whether it is or not.

In addition to the above-mentioned Q code, there is a P code, which is the start information of the song written only at the beginning of the west part (approximately 2 seconds). In addition, TOC information is written in the program t4o, 00, which includes ■La5t Pr
og, No, (how many songs are included?); ■Start time of each program, time (time for each program will be created from now on); ■Lead-out time, etc. are entered. In addition,
The program number is ``8A'' for the part where there is no program.
However, the lead-out time is indicated by program No.
becomes 'AA'^, indicating the time.

In other words, it indicates that there are no songs after this,
Alternatively, it is information indicating the total performance time of all songs.

In the above explanation, a disk is used as the recording medium, but it is not limited to this, and any recording medium that records both information such as music and digital signals such as data and control signals. If available, a source such as a DAT may be used.In other words, it is not limited to a disc player, but may also be a recording device that satisfies the above conditions. The technical idea of the present invention can be applied to any type of playback device.

〔effect〕

Since the disc player of the present invention is configured as described above, it solves the problems of the conventional example and completely prevents the time display during disc playback (playing) from being mixed with the playback sound due to noise generated by data communication. This makes it possible to avoid deterioration in playback quality.

[Brief explanation of drawings]

FIG. 1 is a schematic block system diagram of a disc player of the present invention, and FIG.
Figure 3 is a perspective view of the CD magazine and disk installed in the playback device, Figure 4 is a flowchart for explaining the operation of the present invention, and Figures 5 (^) to (C) are signal waveforms for explaining the operation. It is a diagram. 2... Operation section, 3... Operation button, 4... Display section, 5
...Communication cable, 5a...Reproduction signal wire, 5b
...Digital communication wire, 6...Playback device section, 7
...CD magazine, 8...tray, 9...disc (CD), 10...disc player, 11...
Control section, 12...Microcomputer, 13...Signal processing section, 14...Mechanical section, 22...Control microcomputer, 23...TOC data memory 25...
Muting circuit, 26...amplifier, D I r
D2...Diode.

Claims (4)

[Claims] (1) The playback device section and the operation section are housed in separate housings,
1 for communication such as transfer of operation signals and transmission of playback sounds between the two parties.
In a disc player configured to display various data reproduced from the disc on a display section provided in the operation section, the time during playback of a performance song recorded on the disc is displayed using a multi-core cable. is configured to be displayed based on time data generated by the operating section based on TOC data sent from the playback device section to the operating section via the multi-core cable before the playback of the performance music starts. A disc player characterized by the following. (2) Communication for operation of the operation unit during disc playback should be performed after muting the playback sound of the performance song, and communication between the playback unit and the operation unit should be performed while the playback sound is being output. The disc player according to claim 1, wherein the disc player is configured so as not to perform the above operation. (3) Communication such as time display during fast-forward playback of a disc is configured such that the fast-forward playback sound is intermittently muted and the above-mentioned communication is performed only during the muting. disc player. (4) The multi-core cable has a signal output from the playback device side indicating that playback is in progress as an independent signal line;
2. The disc player according to claim 1, wherein the operation section is configured to perform operations such as displaying the performance time and starting addition and subtraction based on this signal.