JPH06349145A - Reproducing device - Google Patents

Abstract

PURPOSE:To rapidly and accurately retrieve a target track in a reproducing device for reproducing a digital signal like a DCC player, etc. CONSTITUTION:When a front and rear music heads retrieval command is received by a system controller 10 while reproducing a magnetic tape 1, high speed retrieval operation is instructed to a mechanism control means 3. By a marker identification means 9, a marker is identified from an output signal of an auxiliary signal identification means 5 by returning to the head of the marker by controlling the mechanism control means 3 for identifying the marker which was not identified at the time of high speed retrieval from the output signals of the auxiliary signal identification means 5 and an unrecorded part detection means 8 and reproducing it. When the target music head marker is detected by the system controller 10, a tape retrieval end command is outputted to the mechanism control means 3.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a digital compact
The present invention relates to a reproducing device for reproducing a digital signal such as a cassette tape (hereinafter referred to as DCC) player.

[0002]

2. Description of the Related Art In recent years, a reproducing apparatus such as a DCC player has been put into practical use, which can search for a program by using a marker which is auxiliary information indicating the state of the program recorded on a magnetic tape. A DCC player will be described below as an example of the above-described conventional reproducing apparatus with reference to the drawings.

FIG. 4 is a block diagram of a conventional reproducing apparatus. In FIG. 4, the reproducing apparatus controls the mechanism drive means 2 for running the magnetic tape 1, the mechanism control means 3 for controlling the mechanism drive means 2, and the search for the beginning of the track recorded on the magnetic tape 1. Auxiliary signal reproducing means 4 for reproducing an auxiliary signal including a marker signal which is necessary auxiliary information and a label signal which is a signal for protecting identification of the marker, and auxiliary information from the auxiliary signal obtained from the auxiliary signal reproducing means 4. Auxiliary signal identifying means 5 for identifying, a system controller 6 for inputting an output signal of the auxiliary signal identifying means 5 to control the mechanism controlling means 3 to search for the beginning of the magnetic tape 1, and for searching for the front and back tunes. The operation switch 7 for

The operation of the reproducing apparatus configured as described above will be described below. First, when the front or rear bend search switch of the operation switch 7 is pressed while the signal of the magnetic tape 1 is being reproduced, the system controller 6 determines that the front or rear bend search switch is pressed, A command for a high-speed tape search operation in the music head search direction is output to the mechanism control means 3.

Next, when the auxiliary signal identifying means 5 detects the marker of the target music beginning from the output signal of the auxiliary signal reproducing means 4, it outputs an instruction to end the tape search to the mechanism control means 3. Therefore, by searching for the marker recorded on the magnetic tape 1 at high speed, it is possible to accurately search for the target music head in a short time.

[0006]

However, in the conventional reproducing apparatus as described above, the method described below is used to identify the marker recorded on the magnetic tape during the high-speed search of the beginning of a music piece. In order to identify the marker, the non-label portion recorded on the tape on the tape output from the auxiliary signal identification means 5 in a predetermined period and the portion recorded with the marker in a predetermined cycle are continuously continuous for a predetermined time. Then, an envelope signal indicating the label portion that is recorded and a label signal output when the label portion is detected from the envelope signal are used. Normally, as shown in FIG. 3A, only the trailing edge of the envelope signal when the label signal is off is measured to measure the length between the envelope signals, and the marker is identified from the length of the envelope waveform. .

For example, in FIG. 3A, A is the length between the envelope signals of the non-label portion immediately before entering the label portion, and B is the length.
Is the length between the envelope signals in the label part. Since the fall of the envelope signal when the label signal is on is ignored when measuring the length between the envelope signals, the length of the label part B is not the last fall of the label part of the envelope signal, and Measured by capturing the falling edge of the envelope signal after the label signal of is turned off. And non
By comparing the lengths of the label portion A and the label portion B, and if the value of B / A is within a predetermined range, this label portion can be identified as a marker.

However, when a signal is recorded immediately after the marker is recorded, for example, a marker recorded at the final position of the signal recording on the tape is passed by fast-forwarding,
As shown in FIG. 3B, the non-recorded area is entered from the label area. At this time, the length A'between the envelope signals of the non-label portion just before entering the label portion can be measured, but the length B'between the envelope signals of the label portion can be measured under the condition that the label signal is off. Since there is no signal fall, it cannot be measured. Therefore, since the marker cannot be identified even if it passes through the marker, the advantage of the DCC player that the DCC player can accurately search for the front and back tune heads by using the marker recorded on the magnetic tape cannot be utilized. Had a point.

Further, when the marker is recorded at the same time when the recording of the signal is started in the non-recording part, for example, when the recording of the signal is started from the leader tape of the non-recording part,
When a marker or the like indicating the beginning of the recorded music is passed by fast-forwarding the tape, the label portion is entered from the non-recorded portion as shown in FIG. 3B. At this time, since the first falling edge of the embedded signal passes after passing through the label portion, the length between the label portion and the non-label portion immediately before entering the label portion cannot be measured. Therefore, since the marker cannot be identified even if it passes through the marker, the advantage of the DCC player that the front and rear tune heads can be accurately searched by using the marker recorded on the magnetic tape cannot be utilized. Had the problem.

In view of the above-mentioned conventional problems, the present invention accurately detects a marker before and after the beginning of a song by accurately detecting a marker which is auxiliary information indicating the state of a program recorded on a magnetic tape. The purpose of the present invention is to provide a reproducing apparatus that can be used.

[0011]

In order to solve the above-mentioned problems, the reproducing apparatus of the present invention has a mechanism driving means for running a magnetic tape, a mechanism controlling means for controlling the mechanism driving means, and a recording on the magnetic tape. Auxiliary signal reproducing means for reproducing an auxiliary signal including a marker which is auxiliary information indicating the state of the program and a label signal which is a signal for protecting the identification of the marker, and a signal on the magnetic tape which is not recorded. A non-recording portion detecting means for outputting a virgin signal, which is a signal output when the recording portion is running, an auxiliary signal identifying means for identifying auxiliary information from an auxiliary signal obtained from the auxiliary signal reproducing means, and an auxiliary signal identifying means. The marker identifying means for identifying the marker from the output signal of the non-recording portion detecting means, and the marker identifying means are used as auxiliary information at the time of high-speed search of the beginning of the track in the magnetic tape. When it detects that the label part recorded on the marker has entered the non-recorded part, the mechanism control means is controlled to return the tape position to the beginning of the label part and reproduce the auxiliary information to read back the auxiliary information. And a system controller for identification.

In order to solve the above-mentioned problems, the reproducing apparatus of the present invention has a mechanism driving means for running a magnetic tape, a mechanism controlling means for controlling the mechanism driving means, and a program recorded on the magnetic tape. Auxiliary signal reproducing means for reproducing an auxiliary signal including a marker which is auxiliary information indicating the state and a label signal which is a signal for protecting the identification of the marker, and an unrecorded portion on the magnetic tape where no signal is recorded. Non-recording portion detecting means for outputting a virgin signal, which is a signal sometimes output, auxiliary signal discriminating means for discriminating auxiliary information from the auxiliary signal obtained from the auxiliary signal reproducing means, auxiliary signal discriminating means and non-recording portion detection. Marker identifying means for identifying the marker from the output signal of the means, and the marker identifying means records the signal from the non-recording portion at the time of high-speed search of the beginning of the track on the magnetic tape. And a system controller for controlling the mechanism control means to return the tape position to the beginning of the signal recording section and reproducing the auxiliary information when the entry is detected. It is a thing.

[0013]

The present invention has the following functions due to the above-mentioned structure. When the marker identifying unit determines that the label section has entered the non-recorded section during high-speed search of the beginning of the magnetic tape, the reproducing apparatus controls the mechanism control section to return to the head of the label section and read back the auxiliary information to identify the auxiliary signal. By identifying the marker from the output signal of the means, it is possible to accurately search the front and back tune heads without skipping the marker.

Further, in the reproducing apparatus, when the marker identifying means determines that the signal recording section has entered from the non-recording section during high-speed music head search on the magnetic tape, the reproducing apparatus controls the mechanism control section to return to the head of the signal recording section and return to the auxiliary information. By reading back and identifying the presence or absence of the marker or the marker from the output signal of the auxiliary signal identifying means, it is possible to accurately search the front and back tunes without skipping the marker.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a block diagram of a reproducing apparatus in an embodiment of the present invention. In FIG. 1, a mechanism drive means 2 for running the magnetic tape 1, a mechanism control means 3 for controlling the mechanism drive means 2, a marker which is auxiliary information indicating a music head recorded on the magnetic tape 1, and a marker Auxiliary signal reproducing means 4 for reproducing an auxiliary signal including a label signal, which is a signal for protecting identification, and a virgin signal, which is a signal output when running on a non-recorded portion of the magnetic tape 1 on which no signal is recorded. A non-recorded portion detecting means 8, an auxiliary signal discriminating means 5 for discriminating auxiliary information from the auxiliary signal obtained from the auxiliary signal reproducing means 4, an output signal of the auxiliary signal discriminating means 5 and the non-recording portion detecting means 8. Marker identifying means 9 for identifying the marker more, and the marker identifying means 9 does not record from the label portion where the marker is recorded in the auxiliary information at the time of high-speed music head search in the magnetic tape 1. When the entry is detected, the system controller 10 that controls the mechanism control means 3 to return the tape position to the beginning of the label portion and reproduce it to read back the auxiliary information to identify the marker, and the front and back music heads. It is composed of an operation switch 7 for searching.

The operation of the reproducing apparatus configured as described above will be described below. FIG. 2 is a flowchart showing a part of the processing of the system controller 9. First, an operation for searching for a music head existing in front of the magnetic tape during reproduction of the signal from the magnetic tape 1 will be described as an example. When the front music beginning search switch of the operation switch 7 is pressed, the system controller 10 determines in step S30 of FIG. 2 that the front music beginning search switch is pressed and reaches the processing step 31 and the processing step 31. In step 3, a command for a high speed tape search operation is output to the mechanism control means 3 to bring the mechanism drive means 2 into a high speed search state, and the process proceeds to the judgment step 32. Decision step 32
In the marker identifying means 9, the virgin signal changes from OFF to ON from the output signal of the non-recording portion detecting means 8 (FIG. 3).
(N point in (b)) When the determination step 33 is reached. When the trailing edge of the envelope signal is finally captured from the output of the auxiliary signal identifying means 5 in the determination step 33 (FIG. 3B).
If the output of the label signal at point M) is ON, the process goes to step 34. The movement of the magnetic tape 1 by the processing so far is shown in FIG.

In processing step 34, a tape rewinding command is output to the mechanism control means 3 and the label signal of the auxiliary signal identifying means 5 is turned from on to off (FIG. 3 (b)).
(L point) in the high speed search state, and the processing step 37 is reached ((B) in FIG. 3B). In the processing step 37, a tape reproducing operation command is output to the mechanism control means 3 to set the mechanism driving means 2 in the reproducing operation state, and the process proceeds to the judgment step 38. In the judgment step 38, when the marker of the target music head is detected by the output of the auxiliary signal identifying means 5, the process goes to the process step 39, and if not, the process returns to the process step 31 and repeats the above steps (FIG. 3).
(C) of (b). In processing step 39, the system controller 10 outputs a tape retrieval end command to the mechanism control means 3.

As described above, according to the present embodiment, the marker discriminating means 9 judges that the magnetic tape running position has entered the non-recording portion from the label portion at the time of high speed search, and the magnetic tape is turned off from the label signal on. By rewinding until a certain point, and then re-identifying the marker from the output signal of the auxiliary signal identifying means 5 in the reproduction state, it is possible to accurately search the front tune without skipping the marker.

Further, when the system controller 10 detects that the marker identifying means 9 has entered the signal recording portion from the non-recording portion during the high-speed search of the beginning of the music on the magnetic tape 1,
By controlling the mechanism control means 3 to return the tape position to the beginning of the signal recording portion and reproducing it, the auxiliary information is read back to identify the presence or absence of the marker or the marker.

The operation of the reproducing apparatus configured as described above will be described below. FIG. 2 is a flowchart showing a part of the processing of the system controller 9. First, an operation for searching for a music head existing in front of the magnetic tape during reproduction of the signal from the magnetic tape 1 will be described as an example. When the front music beginning search switch of the operation switch 7 is pressed, the system controller 10 determines in step S30 of FIG. 2 that the front music beginning search switch is pressed and reaches the processing step 31 and the processing step 31. In step 3, a command for a high speed tape search operation is output to the mechanism control means 3 to bring the mechanism drive means 2 into the high speed search state, and the process proceeds to the judgment step 32. Judgment step 3
In 2, when the virgin signal changes from on to off (point P in FIG. 3C), the marker identifying means 9 goes to the decision step 35, and goes from the decision step 35 to the processing step 36. The movement of the magnetic tape 1 by the processing up to this point is shown in FIG.
It is shown in (E) of (c).

In processing step 36, a tape rewinding command is output to the mechanism control means 3 and the output of the virgin signal of the non-recording portion detection means 8 is changed from OFF to ON (point P in FIG. 3C). The high speed search state is set, and the processing step 37 is reached ((F) in FIG. 3C). Processing step 37
In step 3, a tape reproducing operation command is output to the mechanism control means 3 to bring the mechanism driving means 2 into the reproducing operation state, and the process goes to the judgment step 38. In the judgment step 38, when the marker of the target music head is detected by the output of the auxiliary signal identifying means 5, the process goes to the process step 39, and if not, the process returns to the process step 31 and the above steps are repeated (((c) in FIG. 3 (c)). G)). In processing step 39,
The system controller 10 outputs a command to end the tape search to the mechanism control means 3.

As described above, according to this embodiment, the marker discriminating means 9 judges that the magnetic tape running position has entered the signal recording portion from the non-recording portion at the time of high-speed search, and the output of the virgin signal from the magnetic tape is turned off. By rewinding from ON to ON, and then re-performing the presence or absence of a marker from the output signal of the auxiliary signal identifying means 5 in the reproducing state, the front and back tune heads can be accurately searched without skipping the marker. .

In the present embodiment, when searching for and identifying all other types of markers as well as searching for markers that are auxiliary information indicating the beginning of a program such as the above-described fast detection of the beginning of a music piece, Is also effective.

[0024]

As described above, according to the present invention, when the marker identifying means determines that the label portion has entered the non-recorded portion during high-speed retrieval in the magnetic tape, the mechanism control means is controlled to return to the head of the label portion to obtain the auxiliary information. The marker is identified by reading back and the output signal of the auxiliary signal identifying means, and when the marker identifying means determines that the signal has entered from the non-recording section to the signal recording section during high-speed search, it controls the mechanism control means to control the head of the signal recording section. By reading back the auxiliary information and identifying the presence or absence of the marker or the marker from the output signal of the auxiliary signal identification means, it is possible to accurately search the front and back of the beginning of the music without skipping the marker, and to check the marker information. Thus, it is possible to realize an excellent reproducing apparatus which can accurately reproduce a complicated tape.

[Brief description of drawings]

FIG. 1 is a block diagram of a playback device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a part of the processing of the system controller 9 of the reproducing apparatus in the embodiment of the present invention.

FIG. 3 is a diagram showing an example of an output signal at the time of passing a marker in the high speed search of the auxiliary signal identifying means 5 of the reproducing apparatus in the embodiment of the present invention.

FIG. 4 is a block diagram of a conventional playback device.

[Explanation of symbols]

 1 Magnetic Tape 2 Mechanism Driving Means 3 Mechanism Control Means 4 Auxiliary Signal Reproducing Means 5 Auxiliary Signal Identifying Means 6 System Controller 7 Operation Switch 8 Non-Recording Part Detecting Means 9 Marker Identifying Means 10 System Controller

Claims (2)

[Claims] 1. A mechanism drive means for running a magnetic tape, a mechanism control means for controlling the mechanism drive means, a marker which is auxiliary information indicating a state of a program recorded on the magnetic tape, and the marker. Auxiliary signal reproducing means for reproducing an auxiliary signal including a label signal which is a signal for protecting the identification of the above, and a virgin signal which is a signal output when running on a non-recorded portion of the magnetic tape on which no signal is recorded. A non-recording part detecting means for outputting the auxiliary signal, an auxiliary signal identifying means for identifying auxiliary information from the auxiliary signal obtained from the auxiliary signal reproducing means, and a marker from the output signals of the auxiliary signal identifying means and the non-recording part detecting means. And a marker identifying means for identifying a marker recorded in the auxiliary information at the time of high-speed search of the beginning of the track on the magnetic tape. A system controller that reads the auxiliary information by returning the tape position to the beginning of the label portion and reproducing it by controlling the mechanism control means when it detects that the label portion has entered the non-recording portion. A reproducing apparatus comprising: 2. A mechanism drive means for running a magnetic tape, a mechanism control means for controlling the mechanism drive means, a marker which is auxiliary information information indicating a state of a program recorded on the magnetic tape, and Auxiliary signal reproducing means for reproducing an auxiliary signal including a label signal, which is a signal for protecting the identification of the marker, and a virgin signal, which is a signal output when the unrecorded portion on the magnetic tape in which no signal is recorded is run. From the non-recording portion detecting means for outputting a signal, the auxiliary signal identifying means for identifying the auxiliary information from the auxiliary signal obtained from the auxiliary signal reproducing means, and the output signals of the auxiliary signal identifying means and the non-recording portion detecting means. Marker identifying means for identifying the marker, and the marker identifying means entered the signal recording portion from the non-recording portion at the time of high-speed music head search in the magnetic tape. When it is detected, the system controller controls the mechanism control means to return the tape position to the beginning of the signal recording portion and reproduce the auxiliary information to read back the auxiliary information and identify the marker or the marker. Playback device characterized by.