JPH01232594A - Device for reproducing recording medium - Google Patents

Abstract

PURPOSE:To shorten the interval of music at the time of recording and reproducing by executing the digital processing of TOC information and channel information with a system controller and executing a search when the interval of the music is decided to be longer than a prescribed time. CONSTITUTION:In a digital recording and reproducing device, a system controller 15 reads a time T to the head of the next music from a pertinent surface which is obtained with the TOC information. Next, together with the start of play, time information (an absolute address) Q, of the pertinent music is read. When a T-Q1 is within the prescribed time, it is discriminated by a music end discriminating means 15a. When the end of the music is discriminated, a level at such a time is read and a silent condition is decided by a decision starting means 15b. When the silent condition is detected longer than the prescribed time, it is discriminated by a music interval discriminating means 15c. Next, Q data Q2 of the pertinent music are read and when a T-Q2 is longer than the prescribed time, the search is executed by a search command 15d. Thus, the time of the music interval can be shortened.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a recording medium reproducing apparatus having a function of fast-forwarding a recorded medium between songs.

[Summary of the invention]

The present invention knows the end time of the five songs based on the TOC information and channel information recorded before the start of the song, and activates the search command means only when the time from that point to the start of the next song is long. This is a recording medium playback device.

[Conventional technology]

Conventionally, this type of recording medium playback device has an automatic music selection device (
AIJTOHISICSEL, ECTIIH) is prepared and detects an unrecorded section while playing a recording medium 1, for example, a tape, and activates a function to search (fast forward) from the unrecorded section to the beginning of the next recorded section. be able to.

[Problem to be solved by the invention]

However, since the AMS function described above detects unrecorded sections in an analog manner, it is possible to detect and search not only unrecorded sections between songs, but even unrecorded sections within a single song. There was a possibility that it would go away. Also, for mechanical reasons, it is necessary to rewind the amount of time that has elapsed after detecting the recording section, which is the final point of the search, until the search stops. Doing so may even result in greater time loss. Furthermore, the above-mentioned AMSlq function is not desirable in terms of sound quality when used for dubbing. This recording medium playback device is used in tape players and the like, and a normal compact disc player simply plays back the unrecorded portions between songs. Therefore, the present invention focuses on the fact that, in some AAI formats, TOC information, channel information, etc. are recorded before the beginning of a song, like a compact disc, and the duration of the corresponding song is clear. The present invention aims to provide a recording medium playback device capable of executing a search only when the gap between songs is determined to be longer than a predetermined time, thereby reducing the gap between songs during recording and playback.

[Means to solve the problem]

Therefore, in the present invention, in a recording medium playback device having a function of fast-forwarding a recorded medium between songs, the end and beginning of a song can be determined based on TOC information and channel information recorded before the beginning of the song. end song determining means for setting the playback time of the corresponding song and determining whether or not a predetermined time before the end of the song has been reached; a determining start means for starting determining whether or not there is silence; an inter-song discrimination means that determines that it is between songs when a predetermined time has elapsed since the inter-song interval; and a search command means that outputs a search start command when the remaining time from the time of the inter-song judgment to the next song is equal to or greater than a predetermined value. Equipped with:

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. Here, recorded information on a digital audio disc 1 that is rotationally driven by a spindle motor 2 is read by an optical pickup 3. This pickup 3 has
It has a built-in laser diode, objective lens, focus actuator, tracking actuator, and even a photodetector. The output of the pickup 3 is sent to the focus servo circuit 4. The signal is input to each of the tracking servo circuit 5 and the phase comparison circuit 8 including an RF amplifier, and the focus servo circuit 4 generates a focus error, and a focus actuator in the pickup is driven according to the amount of this error. The tracking servo circuit 5 generates a tracking error and converts this error component! The signal is sent to the tracking actuator in the pick-up and the pick-up/tube feed servo circuit 6. The output of the pickup feed servo circuit 6 causes the pickup 3 to be fed in the radial direction of the disk 1. The phase difference between the reproduced clock signal obtained by the phase comparator circuit 8 and the reference tallock signal from the tallock generation circuit 14 is detected in the spindle servo circuit 7, and the spindle motor 2 is controlled so that the track linear velocity of the recording disk 1 is constant. is driven. The output of the phase comparison circuit 8 is E, which includes a frame synchronization circuit.
F M (Eight to Fourteen Mo
duration) is supplied to the demodulation circuit 9, and the demodulated output is used for de-interleaving, error detection, and error detection of the demodulated data signal.
The data is processed by a data processing circuit 10 that performs corrections, corrections, etc. Thereafter, the data is temporarily stored in the data memory 11, read out using a constant cycle tarlock signal from the tarlock generation circuit 14, and converted into an analog signal by the D/A (digital/analog) converter 12. This analog signal is outputted as left and right audio signals via an LPF (low pass filter) 13. On the other hand, the control signal in the data from the demodulation circuit 9 is supplied to the system controller 15, and various information such as one song number between each song in the song and audio mute 2 performance time are read. This system controller 15 is made up of one or more microcomputers, and controls the output of the operation section 17 to the key input display 18, and the entire system including each port system and data processing system. In addition, 1
6 is R for storing information from the system controller 15;
AM (random access memory). FIG. 2 shows one aspect of the P channel and Q channel for various control signals recorded on the digital audio disc described above. Discrimination between a song and a song is made by P channel “0” (during song) and “1” (between songs), but if the source song gap is 2 seconds or less, the P channel song interval is The indicated "1" is always held for 2 seconds. In this case, for example, as shown between songs 2 and 3, the signal changes from “0” to “1” in the previous song 2, so the signal of “1” of the P channel is always between the songs of the Shira source. I want it to match on the time axis. In addition, the Q channel has an MNR (music number) and an The signal is obtained. Then, in X, “00” is provided between the source songs,
Further, the number is "01" at the beginning of the song, and in songs that have multiple indexes in the song, X's are numbered sequentially. In the playback device shown in FIG.
The system controller 15 received from the demodulation circuit 9
The MNR of the Q channel of the control signal from the controller is read, and a command is issued to the pickup feed servo circuit 6 and the spindle servo circuit 7 so that the pickup is accessed to the beginning position of the MNR of the designated song, thereby selecting a song. . Next, the display contents of the display 8 will be explained. In the lead-in area of the recording disc 1, time information such as the playing time of each recording track, the elapsed time to the start point of each recording track, and the total playing time is stored. , read by the pickup and sent to the system controller 15 as a control signal.
and stored in RAM 16. On the other hand, by manually reading out and setting the above-mentioned time information using keys on the operating section 17, the read time information is displayed on the display 18 as minutes and 2 seconds or frames. Also, within the program area, the elapsed time within the song and the start time information from the start of the first song are recorded, and similarly, during performance, this time information is read by the pickup and sent to the system controller 15 for calculation processing. be done. Therefore, based on the input shift lever of the operation unit 17, the elapsed time and remaining time of the current song obtained by these calculations can be displayed on the display 18, as well as the current elapsed time and time from the start of the first song. It looks like this. The above-mentioned control signal also includes absolute address information (positional information ?f)), so that it is possible to display the recording position of a famous song, the pickup position, etc. Further, a timer circuit that operates based on the control signal obtained by the demodulation circuit 9 and the tally signal from the tally generating circuit 14 is built into the system controller 15. Next, the operation of the present invention will be specifically explained with reference to FIGS. 3 and 4. First, a key operation is performed on the operation section 17 to designate a song number according to the playing order, and the input signal is sent to the system controller 15. In the system controller 15, for example, MtJSICl. If it is specified to be played in the order of MUSIC2, the MNR of the Q channel at point A accessed by pickup 3 is detected, and at the same time audio mute is turned on, tracking servo circuit 5 and pickup sending servo circuit 6 ．． Furthermore, the spindle servo circuit 7 is controlled to a forced (reverse direction) fast-forward operation state, and the MtJSIC
The pickup 3 is accessed to point B, which is the starting position of oil introduction. The position of point B is detected at the falling timing of "1" of the P channel in MUSTC2 from "1 to 0". At this point, the focus servo circuit 4 is turned on, the spindle servo circuit 7 is controlled to the normal operating state, the pickup and the knob 3 are stopped, and the next music performance standby state is set. In this state, control by the system controller 15 is started as described later, and the audio mute is turned off. With tracking servo circuit 5 turned on, MUSICI
The performance begins. In the system controller 15, the TOC information is obtained from the TOC information in step 5101 in the next song performance standby state. The next song (in this case, MUSICl)
The time length (absolute address) T to the beginning of MUSIC2) is read, and at the same time as the performance starts in step 5102, the Q data which is the time length Wi (absolute address) of the corresponding song (MUSICI) is read. The time information of is assumed to be Ql. As a result, in step 5103, T-(h is calculated, and if it is not within a predetermined time 1, for example, 10 seconds, the process returns to step 5102, but if T-Q1≦1 osec, it is determined that the song is close to the end. In FIG. 3, it is displayed as the end song determination means 15a in the system controller 15. When the above-mentioned end song determination is made, step 5
In step 104, a variable is set to n=1, and in step 5105, the current level Dn is read. Then, in step 5106, for example, if the silent state is -60 dB, if Dn≦-60 dB, it is determined that the performance of the corresponding song has not finished yet, and step 5
Returning to step 104, if Dn≦-60dB, step 51
Move to 07. This is displayed as determination starting means 15b in the system controller 15 in FIG. In step 5107, a delay of 0.1 sec is applied,
In step 8108, the variable is set to n=n+1. Next, in step 3109, it is determined whether the low level is 11 or not, thereby determining whether the level of -60 dB or less has continued for 1 second or more. If it is short, such as 7 silences in the song, the process returns from step 5109 to step 5105, and when it is again determined in step 5106 that Dn≦-60dB, the process returns to step 5105, and the variable n= Initialized to 1. If a silent state of 1 second or more is detected, the process moves to step 5110. This corresponds to the song interval discrimination means 15 in the system controller 15 in FIG.
It is displayed as c. Next, in step 5110, the Q data is read again. If this is Q2, then in the next step 5111 T-Q2
It is determined whether or not is less than a predetermined time 1, for example, 1 sec. If TQ2<1 sec, the process moves to step 5112 and no search is performed, since the search will not substantially shorten the inter-musical time. If T Q2<1 sec, the process moves to step 5113 to perform a search. This is because the search can effectively shorten the time. This corresponds to the system controller 15 in FIG.
It is displayed as search command means 15d in . In this way, it is possible to perform a stop only when the interval between songs is long. In addition, in the above embodiment, the time for action 1 judgment. Although dB is specifically set, this can be selected and set as appropriate. Further, the flowchart of the embodiment is also an example, and for example, the end-of-song determining means determines whether a predetermined time before the end of the song has been reached, and the determination starting means starts determining whether or not there is no sound. Of course, the order may be reversed. Also, in the above example, the search is performed at the beginning of the next track number, but you may wish to limit the search to this. In this case, only the part with the sound will be played, and the rest will be searched. This means that such operations can be considered. In addition, instead of closing the gap between songs during playback, we can pause the silence for a certain amount of time, and then play from the beginning of the next song. Setting the state to an accurate fixed period of time can also be achieved through digital processing by the system controller 15. [Effects of the Invention] As described in detail above, the present invention digitally processes 'r oc information, channel information, etc. recorded before the start of a song using a system controller, and when the interval between songs is longer than a predetermined time. When it is determined that the song
For example, this length can be saved when recording to tape, and it can be effectively used at discos, party venues, etc. when it is necessary to shorten the silence between musical gaps.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a block diagram schematically showing the functions of the system controller, and FIG. 4 is a flowchart. 15... System controller 1-roller, 15a... End of song determining means, 15b... Judgment starting means, 15c... Song interval determining means, 15... Search command means. Patent applicant: Pioneer Co., Ltd. Agent: Patent attorney: Nobuko Konobu, Patent attorney: Susumu Murai, Figure 1, Figure 2

Claims (1)

[Claims] In a recording medium playback device that has the function of fast-forwarding the recording medium between songs, the playback time of the corresponding song is determined based on the TOC information and channel information recorded before the song begins, indicating the end and beginning of the song. an end-of-song determination means for determining whether a predetermined time has elapsed before the end of a song, a determination start means for determining whether or not there is silence; The present invention is characterized by comprising an inter-song discriminating means for determining that the inter-song period is present at times, and a search command means for outputting a search start command when the remaining time from the time of the inter-song determination to the next song is equal to or greater than a predetermined value. Recording media playback device.