JPH04254938A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a announce signal from being reproduced by executing a fade-out operation from a position indicated with absolute time information obtained by subtracting a prescribed value from the absolute time information indicating the recording position f a skip ID. CONSTITUTION:When a PLAY switch 10a is tuned on and set to reproduction mode, a music signal and an announcing signal are outputted as an audio signal and then whether or not a skip ID switch 10d is turned on is discriminated. When the announcing signal which is not outputted as the audio signal is acquired, the switch 10d is pressed, the same switch is turned on at the head position of the portion of the announcing signal and a control signal for forming the skip ID is outputted by a control circuit 8 to a signal processing circuit 3. The skip ID from the signal processing circuit is converted into a signal suitable for magnetic recording in a recording and reproducing circuit 2 and then recorded in a subcode information area via a rotary head 1. Thus, the announcing signal is prevented from being reproduced.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a digital audio tape recorder capable of a fade-out operation that attenuates the playback signal level over time. The present invention relates to a magnetic recording/reproducing device that can set the reproduction signal level to the lowest level.

0002

[Prior Art] A digital audio tape recorder (Digital Audio Tape Recorder) is a magnetic recording and reproducing device.
pe Recorder) is a home VTR (Vid
eo Tape Recorder), digital signals are recorded and reproduced track by track by moving two rotating heads with different azimuth angles at an angle with respect to the running direction of the magnetic tape. There are formed areas for recording information signals such as a PCM area for recording music signals, etc., and a subcode information area for recording subcode signals such as absolute time information indicating the operating status of each track and the position of the magnetic tape. ing.

[0003] Normally, the above-mentioned subcode information area indicates a break in program information consisting of, for example, a music signal or an announcement signal for one song, and includes a start ID (start index signal) used as a cue signal, etc. During playback, a skip ID that causes the program to fast forward in the forward direction until the next start ID is detected is recorded, and the skip ID can be recorded at an arbitrary position by the operator during playback of program information. It has become. As a result, if the digital audio tape recorder does not need to play an announcement signal, for example, by recording the skip ID at the beginning of the announcement signal part and recording the start ID at the beginning of the next music signal, the digital audio tape recorder can record the skip ID at the beginning of the next music signal. It is now possible to reproduce only the audio signal.

By the way, the above-mentioned announcement signal is, for example, when the announcement signal continues at the end of a series of music signals.
Using the start ID and skip ID described above, it is possible to play from the beginning of each music signal part, but for example, if an announcement signal is superimposed in the middle of a series of music signals, The music signal is suddenly switched to another music signal midway through, which causes a great sense of discomfort to the listener.

[0005] Therefore, some conventional digital audio tape recorders are capable of a fade-out operation that attenuates the playback signal level over time. After detecting the ID and performing a fade-out operation, high-speed fast forwarding is performed to the position where the start ID is recorded. As a result, conventional digital audio tape recorders, for example, gradually reduce the size of the announcement signal that follows a certain music signal, and after narrowing it down to the minimum playback signal level, play the next music signal. Even if an announcement signal is superimposed in the middle of a series of music signals, it is possible to minimize the sense of discomfort when switching music signals.

[0006]

[Problems to be Solved by the Invention] However, in the digital audio tape recorder, which is the conventional magnetic recording and reproducing device described above, after detecting the skip ID, the fade
Since the out operation is executed, for example, an announcement signal that is unnecessary for the listener after the skip ID is played back even though it is attenuated, and there is a problem that it is not possible to sufficiently reduce the discomfort when switching the music signal. .

[0007] Accordingly, an object of the present invention is to provide a magnetic recording/reproducing apparatus that can complete a fade-out operation before detecting a skip ID.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the magnetic recording/reproducing device of the present invention detects a position based on absolute time information recorded on a magnetic recording medium such as a magnetic tape, and detects a position on the magnetic recording medium such as a magnetic tape. In the magnetic recording and reproducing device capable of performing high-speed fast forwarding from the recording position of the skip ID recorded on the magnetic recording medium and a fade-out operation that attenuates the reproduction signal level of the signal reproduced from the magnetic recording medium over time, the fade-out operation described above is provided. The out operation is characterized in that it can be executed from the position indicated by the absolute time information that is obtained by subtracting a predetermined value required to complete the fade out operation from the absolute time information indicating the recording position of the skip ID.

[0009]

[Operation] According to the above configuration, it is possible to perform a fade-out operation from the position indicated by the absolute time information obtained by subtracting a predetermined value from the absolute time information indicating the recording position of the skip ID. It becomes possible to complete the fade-out operation by the time the recording position is reached. As a result, the magnetic recording/reproducing device completes the fade-out operation before detecting the skip ID, so it is possible to prevent the playback of announcement signals that are unnecessary for listeners after the skip ID, and when switching music signals. This makes it possible to sufficiently reduce the sense of discomfort.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The digital audio tape recorder, which is a magnetic recording and reproducing apparatus according to this embodiment, moves two rotary heads having different azimuth angles at an angle with respect to the running direction of a magnetic tape, which is a magnetic recording medium. Digital signals are recorded and played back track by track.
Each track is formed with a PCM area for recording music signals, etc., and a subcode information area for recording subcode signals such as absolute time information indicating the operating status of each track and the position of the magnetic tape.

As shown in FIG. 3, the above-mentioned digital audio tape recorder includes a mechanism 6 consisting of a mechanical system for stabilizing the running of the magnetic tape and the rotation of the rotating head drum, and a mechanism 6 provided on the above-mentioned rotating head drum. The rotary head 1 is configured to electromagnetically convert information signals such as the above-mentioned subcode signals and record them on a magnetic tape, and also to reproduce the recorded information signals from the magnetic tape. ing.

The rotary head 1 is connected to a signal processing circuit 3 via a recording/reproducing amplifier circuit 2 that amplifies information signals to a predetermined voltage level.
For example, after being amplified by the recording/playback amplifier circuit 2, the input RF (Radio) is subjected to waveform equivalent and waveform shaping.
By demodulating the frequency) signal and performing various signal processing such as error detection and correction, it is composited into a digital audio signal, and it also performs subcode reproduction and synchronization signal detection. .

The above signal processing circuit 3 includes a fade circuit 4
The fade circuit 4 adjusts the playback signal level after analog conversion of the digital audio signal amplified by the recording/playback amplifier circuit 2 and composited by the signal processing circuit 3. A fade-out operation that attenuates over time is executed when a fade control signal is input. The above fade circuit 4 is connected to a D/A conversion circuit 5,
This D/A conversion circuit 5 is configured to convert a digital audio signal inputted via the fade circuit 4 into an analog signal.

On the other hand, a control circuit 8 connected to the signal processing circuit 3 includes the above-mentioned fade circuit 4, a servo circuit 7 for controlling the mechanism 6, and an absolute control circuit for subcode information in the reproduced signal when the skip ID is recorded. It is connected to a storage circuit 9 that stores time information Tm and an operation circuit 10. still,
When the control circuit 8 is composed of a microcomputer, the storage circuit 9 described above is a RAM (Random Access Mechanism) built in this microcomputer.
mory) may be used.

The above operation circuit 10 includes a PLAY switch 10a that outputs an operation signal, a fade out switch 10b, a start ID switch 10c, and a skip ID switch.
Various operation switches such as a switch 10d and a STOP switch (not shown) are provided, and the PLAY switch 10a outputs an operation signal to the control circuit 8 to control a reproduction mode for reproducing information signals recorded on the magnetic tape. The circuit 8 is configured to execute the process.

Furthermore, when the fade-out switch 10b is turned on in the playback mode, it performs a fade-out operation that attenuates the playback signal level over time, and when it is turned on before the playback mode, it performs a fade-out operation that will be described later. The fade-out operation is executed in the fade-out operation mode (hereinafter referred to as skip fade mode).

Further, the start ID switch 10c executes an after-recording mode for a certain period of time in which the subcode information area is in a recording state and another area is in a playback state, and records the start ID in the above-mentioned subcode information area. It looks like this. Moreover, the skip ID switch 10d is
The dubbing mode described above is executed for a certain period of time, and a skip ID is recorded in the subcode information area, and the absolute time information Tm of the subcode information is stored in the storage circuit 9 described above.

The above-mentioned control circuit 8 stores a program having various routines whose operating states can be changed by control signals from the operation circuit 10. A routine for storing absolute time information Tm in the storage circuit 9 from subcode information in the signal, and a routine for storing the absolute time information Tm stored in the storage circuit 9
A comparison value (T
m-t) and absolute time information Tp recorded in the subcode information area of each track of the magnetic tape, and when the two match, a routine is provided for executing a fade-out operation.

[0020] The above predetermined value t is desirably set to a time that can reduce the playback signal level to the minimum level after starting the fade-out operation. It may be fixed to the type,
Alternatively, it may be arbitrarily set by the operation circuit 10.

The operation of the magnetic recording/reproducing apparatus with the above configuration will be explained.

First, when the PLAY switch 10a is turned on to execute the playback mode, the information signal recorded on the magnetic tape is electromagnetically converted by the rotary head 1, and is amplified, waveform-equalized, and waveform-converted by the recording/playback amplifier circuit 2. This results in a shaped RF signal. This RF signal is output to the signal processing circuit 3, undergoes signal processing such as demodulation, error detection, and error correction, and is composited into a digital audio signal. And this digital audio signal is
It is output to the D/A conversion circuit 5 via the fade circuit 4,
It will be output after being converted to an analog signal.

Next, the start ID switch 10c is turned to O.
If the result is N, an operation signal will be output from the operation circuit 10 to the control circuit 8, and the control circuit 8 that received this operation signal will change the setting from the playback mode to the dubbing mode, and also change the setting from the signal processing circuit. 3, a control signal for forming a start ID is output.

When the above-mentioned dubbing mode is set, the recording state is set in the subcode information area, while the playback state is set in other areas. At this time, the signal processing circuit 3 that has received the control signal forms a digital signal that becomes the start ID, and the start ID made of this digital signal is suitable for magnetic recording on the magnetic tape in the recording/reproducing amplifier circuit 2. After the signal is converted into a signal, it is recorded via the rotary head 1 in the subcode information area of the track recorded on the magnetic tape.

After a certain period of time has elapsed, the above-mentioned dubbing mode is canceled and the PLAY switch 10a is turned on.
The playback mode will be changed to the current state.

By the way, if the series of program information recorded on the above-mentioned track consists of, for example, a music signal and an announcement signal, when the PLAY switch 10a is turned on to set the playback mode, the music signal and the announcement signal are For example, it may be desired to output only a music signal as an audio signal.

Therefore, when only the above-mentioned music signal is output as an audio signal, a skip ID for executing high-speed fast forwarding is recorded, for example, in the subcode information area at the beginning of the announcement signal portion. That is, as shown in FIG. 2, when the PLAY switch 10a is turned on and set to playback mode, music signals and announcement signals are output as audio signals (S
1). After this, it is assumed that the skip ID is recorded for the first time, and the number of recordings N is set to 1 (S2), and the skip ID is set to 1 (S2).
It is determined whether the switch 10d has been turned on (S3).

The determination in S3 above is executed in the playback mode, and the operator listens to the music signal and announcement signal output as audio signals, and selects the skip ID switch for the music signal portion to be output as an audio signal. 10d will be turned OFF. Therefore, the determination result in S3 is NO, and S6 is executed. Then, in S6, it is determined whether a stop mode has been set using a STOP switch (not shown), and if the stop mode has not been set, S3 is executed again (S6).

On the other hand, if an announcement signal that is not output as an audio signal is heard, the skip I
The D switch 10d is pressed, and this pressing turns on the skip ID switch 10d at the beginning of the announcement signal portion. Skip ID above
When the switch 10d is turned on, the above-described post-recording mode is set, and a control signal for forming a skip ID is output from the control circuit 8 to the signal processing circuit 3. Then, the skip ID output from the signal processing circuit 3 is converted into a signal suitable for magnetic recording on the magnetic tape by the recording/playback amplifier circuit 2, and then stored in the subcode information area of the track recorded on the magnetic tape. It will be recorded via the rotating head 1.

[0030] Also, the above skip ID switch 10d
When turned ON, the judgment result of S3 is YES and S4
is executed, and the absolute time information Tm(N) of the subcode information in the reproduced signal when the skip ID is recorded in the subcode information area is stored in the storage circuit 9 (S4). . After this, 1 is added to the number of recordings N,
By executing S3 again, skip IDs are added to multiple locations.
It becomes possible to record (S5). If the stop mode is set, the determination result in S6 is NO, and each skip ID is recorded in the subcode information area and the absolute time information Tm (N) corresponding to each of these skip IDs is recorded. The storage in the storage circuit 9 is completed.

Next, if the fade out switch 10b is turned on in the stop mode after the tape is rewound to the tape position where the PLAY switch 10a was first turned on or to a previous position, the skip fade is performed. mode will be executed. That is, as shown in FIG. 1, it is determined whether the fade out switch 10b is turned on in the stop mode state, and if the fade out switch 10b is turned on, Y
S8 is executed as ES (S7), and it is determined whether the playback mode is set with the PLAY switch 10a (S8).

If the reproduction mode is set, S9 is executed with YES, and the number of recording times N is set to 1 (S9). When the number of recordings N is set to 1, absolute time information Tm(N) corresponding to the number of recordings N is retrieved from the storage circuit 9, and this absolute time information Tm(N) is used to perform the fade-out operation. It is subtracted by a predetermined value t set at a time that can reduce the reproduction signal level to the minimum level after the start. Then, the comparison value (T
m(N)-t) will be compared with the absolute time information Tp of the subcode information in the reproduced signal, and this comparison will be repeatedly performed until the two match (S
10).

When the above comparison value (Tm(N)-t) and the absolute time information Tp match, the fade-out operation is executed as YES, and a fade control signal is output from the control circuit 8 to the fade circuit 4. It turns out. Then, the fade circuit 4 that received this fade control signal controls the D/
The reproduction signal level output from the A conversion circuit 5 is attenuated over time (S11). After this, the absolute time information Tm(N) and the absolute time information Tp will be compared, and this comparison will be continued until the two match.
This will be repeated along with the out movement (S1
2).

[0034] If the above absolute time information Tm(N) and absolute time information Tp match, the comparison result in S12 is YES.
Therefore, S13 is executed, and the presence or absence of the skip ID is determined. Then, if the skip ID is detected, S14 is executed, whereas if the skip ID is not detected, the process ends (S13).
.

When S14 is executed, a skip operation of fast forwarding in the traveling direction is started (
S14). This skip operation will continue until the start ID is detected, and if the start ID is not detected, the skip operation will stop and end (
S15). On the other hand, if the start ID is detected,
If YES is selected, cue & playback mode will be executed. As a result, even if the playback position by the rotary head 1 overruns the start ID recording position during high-speed fast forwarding by skip operation, the playback mode start position will be returned to the start ID recording position (S16
).

[0036] Rotating head 1 in the above cueing & playback mode.
When the is returned to the recording position of the start ID, it is determined whether or not it is in the stop mode, and if it is in the stop mode, it will be stopped at the recording position of the start ID. If not in mode,
It will be executed again from S10 (S17).

In this manner, the magnetic recording/reproducing apparatus according to this embodiment records the recording position of the skip ID using the absolute time information Tm (
N) in the memory circuit 9, and when the skip fade mode is executed, the above absolute time information Tm(
Comparison value (Tm(N)-t) obtained by subtracting the predetermined value t from N)
and the absolute time information Tp of the subcode information in the reproduced signal, and the fade-out operation is completed by the time the recording position of the skip ID is reached. As a result, the magnetic recording/reproducing device completes the fade-out operation before detecting the skip ID, so it is possible to prevent the playback of announcement signals that are unnecessary for listeners after the skip ID, and when switching music signals. This makes it possible to sufficiently reduce the sense of discomfort.

[0038]

Effects of the Invention As described above, in the magnetic recording/reproducing apparatus of the present invention, the fade-out operation that attenuates the reproduced signal level over time is performed based on the absolute time information indicating the recording position of the skip ID. This is a configuration that can be executed from the position indicated by the absolute time information obtained by subtracting the predetermined value required for .

[0039] As a result, the fade-out operation can be executed from the position indicated by the absolute time information obtained by subtracting a predetermined value from the absolute time information indicating the recording position of the skip ID, so that the recording position of the skip ID is reached. It is now possible to complete the fade out operation by
By being able to prevent the reproduction of, for example, an announcement signal that is unnecessary for listeners after the skip ID, it is possible to sufficiently reduce the sense of discomfort when switching music signals.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a routine for executing a skip fade mode.

FIG. 2 is a flowchart showing a routine for recording a skip ID and storing absolute time information Tm.

FIG. 3 is a block diagram of a magnetic recording/reproducing device.

[Explanation of symbols]

1 Rotating head 2 Recording/playback amplifier circuit 3
Signal processing circuit 4 Fade circuit 5 D/A conversion circuit 6 Mechanism 7 Servo circuit 8 Control circuit 9 Memory circuit 10 Operation circuit 10a PLAY switch

Claims (1)

[Claims] Claims 1: Position detection based on absolute time information recorded on a magnetic recording medium, high-speed fast forwarding from the recording position of a skip ID recorded on the magnetic recording medium, and fade-out for attenuating the playback signal level over time. In the magnetic recording/reproducing device capable of performing the fade-out operation, the fade-out operation is performed at a position indicated by absolute time information obtained by subtracting a predetermined value required to complete the fade-out operation from absolute time information indicating the recording position of the skip ID. A magnetic recording/reproducing device characterized by being more executable.