JPH0566664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape recorder having a program selection function.

Prior Art Various song selection functions are used in cassette-type tape recorders, and in particular, in karaoke players using cassette-type tape recorders, a direct song selection function that selects songs by specifying an absolute address from the beginning of the tape has become popular. There is.

On the other hand, in order to prevent song selection malfunctions, it is common to configure the system so that signal detection is not performed from the start to the completion of the mechanism switching, which would make signal detection unstable. This is handled by setting a signal detection prohibition time, etc.

Problems to be Solved by the Invention However, some mechanisms are structured so that the tape and magnetic head come into contact before the switching is completed, and in this case, providing the above-mentioned prohibition time causes Near the start or end of a song, there is a possibility that the inter-song portion may be passed during the change, resulting in no song selection operation. Especially in the case of the direct song selection function,
Since the stored address and the actual address no longer match, the result is that subsequent direct music selection operations are permanently incorrect.

The present invention solves these conventional problems and provides a tape recorder that can accurately detect between tracks by improving the signal detection method during mechanism switching.

Means for Solving the Problems The tape recorder of the present invention includes a storage means for storing that the mechanism is in the middle of switching, a first counting means for counting from the start to the completion of the mechanism switching, and a tape recorder that stores the contents of the storage means. The vehicle is equipped with a discrimination means for selecting whether to perform inter-track recognition or to travel in the opposite direction to the current traveling direction when no signal is detected, and a second counting means to count a certain amount of time while traveling in the opposite direction. be.

Effects According to the present invention, with the above-described configuration, when the storage means and the first counting means memorize that the mechanism is being switched when no signal is detected, the discriminating means and the second counting means: By causing the vehicle to travel in the opposite direction to the current traveling direction for a certain period of time and then traveling in the original direction again, the song interval detection during the mechanism switching is re-detected in a stable state after the mechanism switching is completed. This makes it possible to ensure the detection operation between songs.

Embodiment Hereinafter, a tape recorder according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which 1 is a magnetic reproducing head, 2 is a first-stage amplifier, and 3 is a first-stage amplifier 2.
4 is a mechanism fast-forward travel command switch (hereinafter referred to as "fast-forward switch");
Reference numeral 5 denotes a storage means for receiving a command from the fast-forward switch 4 and storing that the mechanism is in the process of switching. Reference numeral 6 represents a memory means for receiving a command from the fast-forward switch 4 and counting a certain period of time until the mechanism change is completed and resetting the storage means. Counting means 1 and 7 detecting no signal based on the output of the signal detection means 3 and determining the state of the storage means 5 to select whether to recognize between songs or run in the opposite direction (rewinding direction). Means 8 is a second counting means that starts counting at the same time as the start of running in the opposite direction and gives a command to run in the original direction after a certain period of time has passed; 9 is an inter-song recognition that is set by the inter-song recognition output of the discriminating means 7; Means 10 is a mechanism control means, input terminal C is an input for running the tape in the fast forward direction with the tape in contact with the head, R and S are respectively for rewinding direction and music selection operation (stopping music selection, etc.). This is an input to 11 is a mechanism. Note that 12 is a part included inside the microcomputer when this embodiment is implemented using the microcomputer.

Figure 2A shows the recording state of the tape, Figures 2B and C are at position a of the tape shown in A, and Figure 2D is at position e of the tape shown in A, with the fast forward switch turned on. 4 is a timing chart showing the operation when turning ON.

FIG. 3 is a flowchart showing the control contents of the microcomputer 12.

The operation of the tape recorder having the configuration shown in FIG. 1 will be described above with reference to FIGS. 2 and 3.

First, as shown in Fig. 2B, tape position a in Fig. 2A is
When the fast forward switch 4 is turned ON (time T ₁ ), a command is given to the C input of the mechanism control means 10 through the processing of steps 21 to 24 in the flowchart of FIG. 3, and the mechanism 11 is switched to the fast forward state. is started. At this time, the storage means 5 is set to be in the mechanism switching mode, and the first counting means 6 also starts counting. 1st
The counting means 6 finishes counting after the switching of the mechanism 11 is completed, that is, after Δt ₁ has elapsed from the start of switching, and clears the contents of the storage means 5.

On the other hand, the reproduction signal passes through the magnetic reproduction head 1 and the first stage amplifier 2, is converted into a digital signal by the signal detection means 3, and is transmitted to the discrimination means 7.

Normally, as shown in Fig. 2B, a reproduced signal appears at time _T2 during switching of the mechanism 11, but since the level drop is small, the output of the signal detection means 3 does not change and the vehicle continues to run, and there is no signal at time _T3 . After the signal part b is reached and the inter-song detection time constant Δt ₂ has elapsed, the discriminating means 7 processes steps 28, 29, and 33 in FIG. The control means 10 causes the mechanism 11 to perform a song interval detection operation.

Next, as shown in Fig. 2C, tape position a in Fig. 2A is
When the mechanism 11 is activated, if an instantaneous drop in the signal level occurs in the unstable region during mechanism switching, the output of the signal detection means 3 will be the same as when there is no signal at time T ₄ , but at this time Storage means 5
Since the mode is set to the mechanism switching mode, the determining means 7 determines this and puts the mechanism 11 into the rewinding state via the R input of the mechanism control means 10 through the processing of steps 28 to 32 in FIG. The second counting means 8 starts counting. The second counting means 8 finishes counting at time _T5 after a certain period of time _Δt3 has elapsed, and reaches the tape position C in FIG. 2A. At this time, through the processing of steps 34 to ₃₈ in FIG.
is set, the first counting means 6 starts counting, and the discriminating means 7 enters an output inhibited state. In this case, while the mechanism is switching to the fast-forward state, the output of the signal detection means 3 becomes a no-signal state at time T ₆ , similar to the above-mentioned time T ₄ , but at this time, the discriminating means 7 becomes an output prohibited state. The third
The vehicle continues to run by processing steps 28 to 30 in the figure.
The first counting means 6 finishes counting at time _T7 after _Δt1 has elapsed, and the storage means 5 is reset by the processing of steps 25 to 27 in FIG. 3, and the output inhibited state of the discriminating means 7 is released. At this time, the tape in Fig. 2 A has only reached a point d before the initial starting position a, and by the time it passes a, the mechanism 11 is in a stable state and the signal level does not drop, so there is no signal at the non-signal part b. After Δt ₂ , the same process as in the case of FIG. 2B is performed, and the song interval recognition means 9
The tape is set at the same tape position b as in case 2, and the inter-track detection operation is performed.

Next, when the fast-forward switch 4 is turned on near the end of the song, such as tape position e in Figure 2A, the non-signal part b in Figure 2A will appear in the middle of the mechanism changeover, as in the case of Figure 2C. Since the time T ₁ to _{T 5} is reached
Following the same process up to this point, the film is rewound to position f in FIG. 2A and then fast-forwarded again, and after Δt ₁ has elapsed, position g in FIG. 7 is released, and at the subsequent time _T9 , the no-signal part b in FIG. 2A is reached again, and through steps 28, 29, and 33 in FIG. 3, the discrimination means 7 recognizes that it is between songs Then, the song interval recognition means 9 is set, and the mechanism control means 10 performs a song interval detection operation.

As described above, according to this embodiment, the storage means 5 and the first counting means 6 memorize that the mechanism is being switched, and if no signal is detected during the mechanism switching, the discriminating means 7 This is determined by the second counting means 8, and after the vehicle has traveled in the opposite direction for a certain period of time as determined by the count of the second counting means 8, it is caused to travel in the original direction again and the no signal detection is performed. By performing the process again in a stable state after the mechanism switching is completed, it is possible to prevent a erroneous operation in detecting a song interval due to a drop in the signal level during the mechanism switching, and a mistake in detecting a song interval at the time of starting near the end of the song.

Effects of the Invention As described above, the present invention includes a storage means for storing that the mechanism is in the middle of switching, a first counting means for counting from the start to the completion of the mechanism switching and clearing the contents of the storage means, and By providing a discriminating means that refers to the contents of the storage means and outputs different outputs depending on the contents, and a second counting means that is activated by the output of the discriminating means when the mechanism is being switched, there is no signal when the mechanism is being switched. If this is detected, the discriminating means starts traveling in the opposite direction, and after traveling for a certain period of time as determined by the second counting means, the vehicle travels in the original direction again. By running the old tape again in a stable state after the mechanism switch is completed and detecting no signal, it is possible to prevent false detection between songs due to a drop in signal level when changing the mechanism.
It is possible to prevent mistakes in detecting between songs when the mechanism is activated near the start or end of a song.
This makes it possible to realize a more reliable song interval detection function.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tape recorder according to an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of each part, and FIG. 3 is a flow chart thereof. 1...Magnetic reproducing head, 2...First stage amplifier, 3
...Signal detection means, 4...Fast forward switch, 5...
...Storage means, 6...First counting means, 7...Discrimination means, 8...Second counting means, 9...Song interval recognition means, 10...Mechanism control means, 11...Mechanism.

Claims (1)

[Claims] 1. A storage means for storing the mode from the start to the completion of mechanism switching, that is, a mode in the middle of mechanism switching, and a storage means for counting the time from the start to the completion of mechanism switching and clearing the contents of the storage means. a first counting means having an output; a signal detecting means for determining the presence or absence of a reproduced signal; and when the output of the signal detecting means becomes a no-signal state, the content of the storage means is referred to and changes depending on the content. a determining means for outputting;
a second counting means that is activated by the output of the determining means when the storage means is in the mechanism switching mode, performs counting for a certain period of time, and outputs an output when the counting is completed; and a determining means when the storage means is not in the mechanism switching halfway mode. The apparatus is configured such that the output of the discrimination means is blocked by the output of the second counting means and the blocking is canceled by the output of the first counting means, and the storage means is set by the mechanism. When the mode is in mid-switch mode, the output of the discriminating means determines travel in the opposite direction to the current traveling direction, the output of the second counting means determines travel from the opposite direction to the original direction, and the output of the inter-song recognition means determines the interval between songs. A tape recorder comprising mechanism control means for providing an output to drive the mechanisms to perform respective operations.