JPH0622072B2 - Tape recorder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder having a cueing function.

2. Description of the Related Art In recent years, various music cueing functions have been proposed in cassette type tape recorders. In particular, the direct music selection function that specifies an absolute address from the beginning of the tape to perform cueing is used for karaoke using a cassette tape. It is installed in many karaoke players because it is convenient when performing. Further, in the case of the direct music selection function, it is required to accurately find the specified absolute address, so that the accuracy is higher than that of other search functions. On the other hand, the means for realizing the cue function is to determine whether or not there is a space between songs, and the determination level and the determination time are set to constant values using a dedicated IC or a comparator to perform the determination. And the time constant of charging / discharging by resistance.

Problems to be Solved by the Invention However, in the conventional device, the mechanism at the time of cue running is to rotate the tape take-up reel base while keeping the motor speed constant, so the tape speed is proportional to the tape take-up diameter. And grow bigger. Therefore, in the case of the conventional method of making a judgment with a constant judgment time, if the judgment time is set so that the track interval can be detected at a position where the tape winding diameter is large, that is, a position where the tape speed is large, the tape winding diameter However, there is a problem in that a silent portion in a song is determined to be an interval between songs and a malfunction occurs at a position where the tape is small, that is, a position where the tape speed is small, and sufficient accuracy cannot be ensured.

The present invention solves such a conventional problem, and provides a tape recorder which accurately determines a music interval according to a tape speed.

Means for Solving the Problems A tape recorder according to the present invention comprises a signal detecting means for determining the presence / absence of a signal, a first counting means for counting the no-signal time by the output of the signal detecting means, and a tape winding device. Rotation detecting means for detecting the rotation of the reel stand, and second counting means for counting the rotation cycle by the output of the rotation detecting means,
First cycle storage means for storing the value of the second counting means during reproduction, and the second cycle storage means during high speed traveling
Of the first cycle memory means for storing the value of the second cycle memory means for storing the value of the counter means and the value of the second cycle memory means at the time of reproducing the tape position following the end of the high speed running. And a second calculation means for calculating the product of the calculation result of the first calculation means and the value of the first counting means, and a calculation result of the second calculation means. It is provided with a judging means for judging whether or not there is a music piece by comparing with a certain value.

Operation According to the present invention, with the above-described configuration, the cycle of the output pulse of the rotation detecting means at the time of reproduction and at the time of high speed traveling is stored in the second and third storage means, and the ratio between the two is calculated by the first calculating means. Is calculated to calculate the ratio of the tape speed during high speed running to that during playback, and the product of the calculation result by the first calculating means by the second calculating means and the value of the no-signal time detected during high speed running. It is possible to obtain the value of the no-signal time converted at the time of reproduction by calculating, and to judge whether it is between songs by the judging means.By calculating the tape speed ratio and calculating the no-signal time at the time of reproduction, Since the inter-track determination is performed, the inter-track determination can be accurately performed according to the change in tape speed.

Embodiment A tape recorder according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration in an embodiment of the present invention, in which 1 is a signal detecting means for discriminating the presence or absence of a signal, and 2 is a first counting for counting a no-signal time by an output of the signal detecting means. Means, 3 is a mechanism, 4 is a rotation detecting means for detecting the rotation of the take-up reel base of the mechanism 3, 5 is a second counting means for counting the cycle of rotation by the output of the rotation detecting means 4, and 6 and 7 are reproduction means. 1st and 2nd cycle storage means for storing the count value of the cycle by the second count means 5 during high speed and high speed running respectively, and 8 is a count value of the second count means according to the mode of the mechanism 6. The first
Selection means for selecting which of the second two cycle storage means 6 and 7 is to be stored, and 9 is for calculating the ratio of the value of the first cycle storage means 6 to the value of the second cycle storage means 7. 1 calculating means, 10 is a second calculating means for calculating the product of the calculation result of the first calculating means 9 and the first counting means 2, 11
Is a judgment means for comparing the calculation result of the second calculation means 10 with a certain constant value to judge whether it is between songs or not, and 12 is a control means for controlling the operation of each of the above parts.

FIG. 2 is a timing chart showing the output waveform of the signal detecting means 1, the output waveform of the rotation detecting means 4, and the operation mode of the mechanism 3 during the actual processing.

FIG. 3 is a flow chart showing the processing contents of each part of the system shown in the block diagram of FIG.

FIG. 2 shows the tape recorder configured as described above,
The operation will be described with reference to FIG.

First, at a time t ₁ in FIG. 2, the mechanism 3 is in a high-speed traveling state for cueing a song, and since the signal is detected by the signal detecting means 1, the process proceeds from step 21 to step 22. The counting means 2 of 1 has no count number (it is judged that there is no signal in step 21 and proceeds to step 24 and counts only), and the constant count number (C ₁
Therefore, the process proceeds from step 22 to step 23 and is reset. Next, when a no-signal portion is detected at time t ₂ in FIG. ₂ , the process proceeds from step 21 to step 24 in FIG. 3, and the first counting means 2 starts counting. Moreover, if the signalless part continues here, the first
Although the counting of the counting means 2 of 1 proceeds, the counted number is judged in steps 25 and 26, and when the numerical value reaches a constant value (C ₁ ), it proceeds to step 27 and stores it. Further, when the non-signal portion continues and the count number reaches a constant value (C ₂ ) larger than the constant value (C ₁ ),
From step 25 to step 28, the step 2
In step 8, the count number C ₁ of the first counting means 2 is cleared, and in the next step 29, the no-signal portion detected by the signal detecting means 1 is judged to be between tracks. The constant values C ₁ and C ₂ of the count are usually values corresponding to a time of 80 to 200 msec, depending on the mechanism used.

On the other hand, before the count by the first counting means 2 reaches the smaller constant value C ₁ and reaches the larger constant value C ₂ , the next presence signal is detected and the time t ₃ shown in FIG. 2 is detected. In this case, the process proceeds from step 21 to step 22 in FIG. 3, and in step 27, the count number equal to or greater than the constant value (C ₁ ) is stored.
Then, the current mode, that is, the high-speed traveling mode is stored, and the mechanism 3 is set to the reproduction mode via the output terminal E. Further, if the time t ₃ is reached before the count by the first counting means 2 reaches the smaller constant value C ₁ , there is no memory at step 27 when the process proceeds from step 21 to step 22. From step 22 to step 23, the count of the first counting means 2 is cleared and the non-signal portion is ignored.

On the other hand, regarding the rotation detection of the take-up reel stand, it is the second until the fall of the output of the rotation detection means 4 from H to L is detected.
Counting means 5 continues counting (steps 31, 3 in FIG. 3).
2), when the falling edge of H to L is detected, the selection means 8
Information on the current mode of the mechanism 3 is obtained from the control means 12 via the output terminal G, and the value of the second counting means 5 is set to the first cycle storage means 6 or the second cycle storage means 7 according to the mode. Memorize to

That is, first, in the high speed traveling mode of the mechanism 3 from time t _{1 to} t ₄ shown in FIG. 2, the process proceeds from step 31, 33 in FIG. 3 to step 35, and the high speed traveling state is judged in this step 35. Then, the process proceeds to step 36, in which the time t of the high speed traveling mode is
_The value corresponding to the cycle T ₁ immediately before ₃ is the second cycle storage means 7
Memorized in.

Further, the mechanism 3 from time t _{1 to} t ₄ shown in FIG.
From the high speed running mode of FIG. 3, the output of the rotation detecting means 4 falls from L to L at time t ₅ shown in FIG. Although it is detected, since it is the first time after the mechanism 3 is switched here, this is judged in step 33 and the process proceeds to step 34 to be ignored. When the trailing edge from H to L is detected again at time t ₆ , the process proceeds from step 31, 33 to step 35. In this step 35, the reproduction mode is determined and the process proceeds to step 37, from time t ₅ to t. period T ₂ of the between ₆ is to be stored in the first period storage means 6.

As described above, in steps 36 and 37, the cycle T _{1 of the} high-speed traveling mode stored in the second cycle storage means 7 and
Reproduction mode cycle T stored in the first cycle storage means 6
_As is clear from FIG. ₂ , since ₂ is immediately before and after the transition from the high speed running mode to the reproduction mode, it can be said that 2 is a cycle where the tape position is equal to the total tape length.

Next, through the output terminal F corresponding to the memory of “being equal to or greater than C ₁ ” of the control means 12, the first calculation means 9 causes the first cycle storage means 6 for the value of the second cycle storage means 7.
Is performed, that is, the ratio of the rotation cycle T ₂ at the time of reproduction to the rotation cycle T ₁ at the time of high-speed traveling is calculated, and the second calculation means 10 causes the first calculation means 9 to operate. A calculation is performed to calculate the product of the calculation result of 1 and the count value of the first counting means 2, that is, the value corresponding to the signalless time τ detected by the time t _{3 in} FIG. That is, first, step 3 in FIG.
8, the count of the first counting means 2 is a constant value (C
₁ ) It is judged from the memory in step 27 that it is above, and if it is C ₁ or above, the routine proceeds to steps 39 and 40. Then, in step 40, the steps 36,
The calculation is performed based on the rotation cycles T ₁ and T ₂ stored in 37 and the signalless time τ counted by the first counting means 2.

Here, the calculation contents of the first calculating means 9 and the second calculating means 10, that is, τ × (T ₂ / T ₁ ) is inversely proportional to the rotation cycle of the reel stand and the tape speed at that time if the tape positions are equal. Therefore, T ₂ / T ₁ corresponds to the tape speed ratio at the time of high-speed running to the time of playback, and the product of the tape speed ratio and the no-signal time τ at the time of high-speed running gives the no-signal time converted at the time of playback. Means the calculation of the value of.

Next, the judging means 11 compares the calculation result of the second calculating means 10 with a certain constant value (C ₃ ) to judge whether or not there is a music interval. If it is C ₃ or more, it is determined as “between songs” in steps 41 and 29 in FIG.
It is transmitted to the control means 12 via the input terminal A, and if it is less than C ₃ , it is determined that it is “not between songs”, and is transmitted to the control means 12 via the input terminal B, and the control means 12 stores it internally. Output terminal E to return to the high speed running mode
The mechanism 3 is controlled via (steps 41 and 42 in FIG. 3). It should be noted that D ₂ is a value corresponding to the minimum time (normally about 3 seconds) for determining the no-signal portion as the interval between songs during reproduction.

As described above, according to the present embodiment, the ratio of the tape speed at the time of high-speed running to that at the time of reproduction is calculated by the first calculating means 9 from the values of the first cycle storing means 6 and the second cycle storing means 7. Further, the second computing means 10 calculates the value of the no-signal time converted at the time of reproduction from the tape speed ratio and the no-signal time at the time of high speed running, and the judging means judges whether or not there is an intertrack. Therefore, it is possible to perform an accurate inter-track detection operation according to a change in tape speed.

As described above, according to the present invention, the signal detecting means for determining the presence or absence of a signal, the first counting means for counting the no-signal time by the output of the signal detecting means, and the rotation of the tape take-up reel stand Rotation detecting means for detecting the rotation speed, second counting means for counting the rotation cycle by the output of this rotation detecting means, and first cycle storing means for storing the value of the second counting means at the time of reproduction. A second cycle storing means for storing the value of the second counting means at the time of high speed running, and a second cycle storing means for the value of the second cycle storing means at the time of reproducing the tape position following the end of the high speed running. A first calculating means for calculating the ratio of the values of one cycle storing means; a second calculating means for calculating the product of the calculation result by the first calculating means and the value of the first counting means; The calculation result by the second calculation means By providing a judging means for judging whether or not there is a music interval by comparing with a fixed value, it is possible to realize a music interval detecting operation corresponding to a change in tape speed. It is possible to prevent a phenomenon in which a silent portion in a music piece is determined to be a space between music pieces at a small position and a malfunction occurs, and an excellent tape recorder having a high-accuracy cueing function can be realized.

[Brief description 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, and FIG. 3 is a flowchart showing the processing contents of each section. 1 ... Signal detecting means, 2 ... first counting means, 3 ... mechanism, 4 ... rotation detecting means, 5 ... second counting means, 6 ... first cycle storing means, 7 ... Second cycle storage means, 8 ... Selection means, 9 ... First calculation means, 10 ...
... second computing means, 11 ... judging means, 12 ... controlling means.

Claims (1)

[Claims] 1. A signal detecting means for determining the presence / absence of a signal, a first counting means for counting a signalless time by the output of the signal detecting means, and a rotation detecting means for detecting the rotation of a tape take-up reel stand. A second counting means for counting the rotation cycle by the output of the rotation detecting means, a first cycle storing means for storing the value of the second counting means at the time of reproduction, and a high speed running time. The second cycle storing means for storing the value of the second counting means, and the first cycle storing means for the value of the second cycle storing means at the time of reproducing the tape position following the end of the high speed running. The first arithmetic means for calculating the ratio of the values, the second arithmetic means for calculating the product of the arithmetic result by the first arithmetic means and the value of the first counting means, and the second arithmetic means By comparing the calculation result with a certain value Tape recorder characterized by comprising a determining means for one of determining whether between tracks.