JPH0333943Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an auto-reverse tape player,
In an auto-reverse tape player that has a so-called music scan function that runs a magnetic tape at high speed and plays only the beginning parts of multiple songs recorded on the magnetic tape, only one of the normal and reverse directions is used. By making it possible to perform a music scan of all songs recorded on the normal side and reverse side while the tape is running, the time required for music scan can be shortened. The invention relates to an auto-reverse tape player.

Conventionally, one of the functions provided by auto-reverse tape players is a function called a music scan. Music scan is a function that detects the start point of a song recorded on a magnetic tape while running it at high speed, and plays for several seconds each time the start point between songs is detected. The purpose is to let you know the general contents of all the songs included in a short period of time. FIG. 1 shows a conventional example of the music starting point detecting means. Reference numerals 1 to 4 in the figure are reproduction heads, in which reproduction heads 1 and 2 are for the normal side L and R channels, and reproduction heads 3 and 4 are for the reverse side R and L channels. 5 is a changeover switch, 6 and 7
8 represents a preamplifier, 8 represents a mixer, and 9 represents a waveform shaping circuit.

In the conventional example shown in FIG. 1, the reproduction signals from the reproduction heads 1 to 4 are switched between normal scan and reverse scan by a changeover switch 5, and are outputted via a preamplifier 6 to an L-channel reproduction signal a. , the R-channel reproduction signal b is outputted via the preamplifier 7, respectively. Then, the mixer 8 performs a mixing process on the L and R channel reproduction signals a and b, as shown in FIG.
An LR mixed signal c having a waveform shown in the figure is generated. Note that the illustrated arrows t ₁ , t ₁ , . . . in FIG. 2A indicate inter-song sections (no-signal regions), and the illustrated arrows t ₂ , t ₂ , . . . indicate song sections (music signal regions). Next, the LR mixed signal c generated in the mixer 8 is converted into a pulse signal d as shown in FIG. 2B in the waveform shaping circuit 9. Then, based on the pulse signal d output from the waveform shaping circuit 9, a music scan, which will be described later, is controlled by a CPU (not shown). That is, the music scan control by the CPU is to detect the rising edge of the solenoid pulse signal d inputted from the waveform shaping circuit 9, set it in a play state for a predetermined period of time (for example, 5 seconds) from the time of detection of the rising edge, and After playing for a second, the operation of causing the magnetic tape to run at high speed is repeatedly performed until the next rising edge is detected. The music scan operation in the conventional example shown in FIG. 1 will be explained with reference to FIG. The illustrated arrow N in FIG. 3 indicates the normal side recording mode on the magnetic tape, the illustrated arrow R indicates the reverse side recording mode, the shaded area represents the inter-track section, and the other portions indicate the song section. There is.

When performing the above-mentioned music scan, first rewind the magnetic tape (hereinafter referred to as REW).
Then, the reproducing heads 1 to 4 are positioned at the beginning of the magnetic tape. Then, by fast forwarding the magnetic tape in the normal direction (hereinafter referred to as FF), a music scan in the normal direction (in the direction of arrow FF in the figure) is performed. At this time, the changeover switch 5 shown in FIG. 1 is switched to select the outputs of the reproduction heads 1 and 2 on the normal side. When the music scan in the normal direction is completed, the changeover switch 5 is switched to select the output of the playback heads 3 and 4 on the reverse side, and also performs REW of the electromagnetic tape in the reverse direction (reverse direction indicated by the arrow REW). direction). The state of the Miyuszk scan is indicated by the illustrated arrows in Figure 3, where the thin arrow section represents the FF or REW state, the thick arrow section NP represents the normal play state, and RP represents the reverse play state. represents the state.

The conventional music scan method shown in FIG. 1 has been described above. However, in the conventional music scan method, as shown in FIG. The drawback was that it took a long time.

The present invention aims to solve the above-mentioned drawbacks, and performs a music scan of all songs recorded on the normal side and reverse side while the tape is running in either the normal or reverse direction. An object of the present invention is to provide an auto-reverse tape player that can shorten the time required for music scanning by making this possible.
This will be explained below with reference to the drawings.

Figure 4 is a block diagram for explaining the configuration of an embodiment of the present invention, and Figure 5 is a music diagram of the present invention.
FIG. 6 is a flow chart for explaining the music scan operation of the present invention, and FIG. 7 is a detailed explanatory diagram of the embodiment shown in FIG. 5.

In FIG. 4 showing the configuration of an embodiment of the present invention,
Reference numerals 1 to 9 in the figure correspond to those in FIG.
6' and 7' are preamplifiers, 8' is a mixer, 9' is a waveform shaping circuit, 10 is a CPU, 11 is a key input section,
Reference numeral 12 represents a display section, and reference numeral 13 represents an auto-reverse tape player mechanism.

The auto-reverse tape player of this invention is
As shown in FIG. 4, each of the reproduction heads 1 to 4 is independently provided with preamplifiers 6, 7, 6' and 7', and the reproduction signals of the L-channel and the R-channel are reproduced. Mixers for mixing signals are also provided independently on the normal side and the reverse side. That is, the mixer 8 mixes the normal side L-channel reproduction signal e and the R-channel reproduction signal f to generate and output the normal side LR mixed signal c, and the mixer 8' mixes the normal side L-channel reproduction signal e and the R-channel reproduction signal f. LR on the reverse side by mixing the L channel reproduction signal g and the R channel reproduction signal h.
It generates and outputs a mixed signal c'. and,
As explained with reference to FIG. 2, the normal side LR mixed signal c is converted into a pulse signal d in the waveform shaping circuit 9, and the reverse side LR mixed signal c is converted into a pulse signal d.
c' is converted into a pulse signal d' in a waveform shaping circuit 9'. Therefore, by simply running the magnetic tape in either the normal direction or the reverse direction, the CPU 10 can detect the starting points of all songs recorded in the normal and reverse directions. Note that the gain control signal i output from the CPU 10 is lower than that of the mixers 8 and 8' during play because the level of the playback signal during play is lower than that during FF and REW.
This is to increase the gain. Also,
The control signal j output from the CPU 10 is a switching signal for the changeover switch 5 that switches between normal play and reverse play in the play mode.

Next, the control operation of the CPU 10 during the music scan of the present invention is shown in FIGS. 5 and 6.
This will be explained with reference to the figures. Note that the symbols in FIG. 5 correspond to those in FIG. 3. The symbol NP in Fig. 6 is the normal play available flag, (NP → 1) represents the normal play available state, (NP → 0) represents the cancellation of the normal play available state, and the symbol RP represents the reverse play available flag. Available Flag (RP→1)
indicates that reverse play is possible (RP → 0)
indicates the release of the reverse play enabled state, and the symbol NR is the double detection flag (NR
→1) indicates that the starting point of a song recorded on the reverse side was detected during normal play.

As shown in the illustrated flowchart in FIG. 6, when a key input for starting a music scan is performed at the key input section 11, the playback head is positioned at the beginning of the magnetic tape.
Initial operations to continue REW are performed. After the initial operation is completed, a music scan as illustrated in FIG. 5 is performed. T ₀ in Figure 5
represents the starting point of Miyuszczyk scan, and
FF starts from time T ₀ , and when the song start point on the normal side (hereinafter abbreviated as N side) is detected at time T ₁ , normal play (hereinafter abbreviated as NP) is started for a predetermined time (this example (assumed to be set to 5 seconds). Then, FF is started again at time _T2 , which is 5 seconds after the time _T1 . The operation of the music scan from time T ₀ to time T ₂ above corresponds to ○I to ○○ in the flow chart shown in FIG. Furthermore, the music scan operation from time _T2 through time _T3 to time _T4 is performed in the same manner as the period from time _T0 to _T1 to _T2 described above. Then, FF starts again from the above T ₄ time point, and when the song start point on the reverse side (hereinafter abbreviated as R side) is detected at T ₅ time point, reverse play (hereinafter abbreviated as RP) elapses for 5 seconds. The test is carried out until _T6 . The above-mentioned music scan operation from time T ₄ to time T ₆ corresponds to the operation from ○R to ○Y via ○RO to ○NI in the illustrated flow chart of FIG.

In this way, the music scan is similarly performed from the above-mentioned time _T6 until the time Te when the reproducing head reaches the end of the magnetic tape. That is,
In this invention, NP is performed for 5 seconds from the time when the N side music start point is detected, and RP is performed for 5 seconds from the time the R side music start point is detected.
Continuing FF will result in Miyuszczyk Scanning. In addition to the scan operation mode described above, there is an operation when, for example, an R-side song start point is detected during NP. That is, the operation is performed when a song start point is detected on the N side at time T ₇ in FIG. 5 and a song start point on the R side is detected at time T _{8, which is before time T 9 when} the 5-second NP ends. be. In such a case, as shown in the circle in the flowchart of FIG. 6, the double detection flag NR is set to "1" at the time _T8 . In this way, when (NR→1) occurs during NP,
As shown in FIG. 5, REW starts from time _T9 when the NP ends. Then, from time T ₁₀ when the song start point on the R side is detected again,
RP is performed for 5 seconds. Note that, as described above, the FF is restarted from the time point _T11 when the RP ends, and the music scan is continued. The above-mentioned scanning operation from time T ₈ to time T ₁₁ corresponds to ○to~○ta~○chi or ○nu~○re~○so~○wa or ○yo in the illustrated flow chart in FIG. It is something. In addition, in the music scan operation of the present invention explained in connection with FIGS. 5 and 6, in order to avoid complicating the explanation and make it easier to understand, NP and RP are used to detect the starting point of the song. Although the explanation has been made as if they were performed simultaneously, since an overrun due to FF or REW occurs, the processing is actually performed as shown in FIG. 7. In other words, in the case of NP, after the FF has stopped, the NP is performed after backing up by REW for a predetermined time, and in the case of RP, the FF is stopped.
Start RP as soon as it stops.

The music scan operation of the present invention explained in connection with FIGS. 5 to 7 above is an embodiment in which music scan is performed while performing FF from the beginning of the magnetic tape. It is obvious that the present invention is not limited to this, and music scanning can be easily performed in the same way while performing REW from the end of the magnetic tape.

As explained above, according to the present invention, music scanning of all songs recorded on an electromagnetic tape can be performed simply by running the tape in either the normal direction or the reverse direction. It is possible to provide an auto-reverse tape player that makes it possible to shorten the time required for scanning.

[Brief explanation of the drawing]

Figure 1 shows the circuit configuration of the part related to signal extraction in a conventional auto-reverse tape player.
FIG. 2A is an LR mixed signal waveform diagram, FIG. 2B is a pulse signal waveform diagram, FIG. 3 is an explanatory diagram for explaining the implementation of the music scan in the conventional example shown in FIG. 1, and FIG. A block diagram for explaining the configuration of one embodiment of the present invention, FIG. 5 is an explanatory diagram for explaining an embodiment of the music scan in the present invention, and FIG. 6 explains the operation of the music scan in the present invention. 7 shows a detailed explanatory diagram of the embodiment shown in FIG. 5. In the figure, 1 to 4 are playback heads, 5 is a changeover switch, 6, 6', 7 and 7' are preamplifiers, 8 and 8' are mixers, 9 and 9' are waveform shaping circuits,
10 is the CPU, 11 is the key input section, 12 is the display section,
13 represents an auto-reverse tape player mechanism.

Claims (1)

[Scope of utility model registration request] In an auto-reverse tape player equipped with a normal drive playback head and a reverse drive playback head for reading information recorded on a magnetic tape, the normal drive playback head and the reverse drive playback head are operated while the magnetic tape is traveling in one direction. detection means for detecting the playback signals of the respective heads; and play means for playing and outputting the information until a predetermined time elapses from the point of detection based on the music start point detected by the detection means. An auto-reversing tape player having a function of playing the start portions of all songs recorded on the magnetic tape while the magnetic tape is running in one direction.