JPH0622073B2 - 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 by using a dedicated IC or a comparator, and the determination time is determined. It is set by the time constant of charging and discharging by the capacitor and the resistor.

The problem to be solved by the invention is that, in the conventional device, the mechanism at the time of cueing and 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. Grows. 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. Judgment means for judging whether there is a music interval by comparing with a certain value, and the minimum time for judging no signal as a music interval, the value during playback corresponds to the maximum and minimum tape speeds during high speed running The first and second constants converted into the value to be set are set, and the count value of the counting means is set to the first value.
If it is smaller than the constant, it is judged that it is not "between songs", and if it is the second constant or more, it is judged that it is "between songs". And a count value determining means for instructing the interval determining means to determine the music interval.

Operation According to the present invention, with the above configuration, the counting means counts the no-signal time during high-speed traveling, and the count value judging means compares the count value with the first and second constants. If it is smaller than the first constant corresponding to the maximum speed, it is not "between songs", and if it is larger than the second constant corresponding to the minimum speed, it is "between songs", and the first constant is further determined. If it is larger than the second constant and is smaller than the second constant, the inter-track determination means converts the no-signal time detected during high-speed running into a corresponding value during reproduction to perform inter-track determination, so that it is accurate according to changes in tape speed. It is possible to judge between different songs.

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 of an embodiment of the present invention, in which 1 is signal detection means for determining the presence or absence of a signal,
Reference numeral 2 is a first counting means for counting the time when the output of the signal detecting means is in a non-signal state, 3 is a music interval determining means, a rotation detecting means 4 for detecting the rotation of the tape take-up reel stand, and a rotation. The second counting means 5 for forming a cycle of, the first cycle storing means 6, the second cycle storing means 7 for storing the count value of the second counting means 5 at the time of reproduction and high-speed traveling, respectively, and Calculation for converting the no-signal time detected during high-speed running into a corresponding value during reproduction by the respective values of the first counting means second, first cycle storing means 6, and second cycle storing means 7. It is composed of a means 8 and a judging means 9 for judging the interval between songs according to the calculation result. Reference numeral 10 is a count value judging means for judging the music interval by the first and second constants with respect to the count value of the first counting means 2, and 11 is a judgment of the music interval judging means 3 and the count value judging means 10. Reference numeral 12 denotes a mechanism for controlling the mechanism in response.

FIG. 2 is a timing chart showing the output waveform of the signal detecting means, 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 12 is in a high-speed traveling state for cueing a song, the signal is detected by the signal detecting means 1, and the first counting means 2 is set to the step in FIG. It is reset by the processing of 21 to 23.
Next, when no signal portion is detected at time t ₂ in FIG. ₂ , the first counting means 2 starts counting by the processing of steps 21 and 24 in FIG. When the signalless portion continues and the count value of the first counting means 2 reaches the first constant C ₁ , that is, the inter-track determination time at the maximum tape speed, the count value determination means 10 detects this and the third It is stored internally by the processing of steps 25 to 27 in FIG. When the signalless portion continues and reaches the second constant larger than C ₁ , that is, the inter-track determination time at the minimum tape speed, the count value determination means 10 detects this, and steps 25, 28 in FIG. treatment of 29 judges that no signal section to be "between tracks", "is C ₁ or more" with transmitted to the control means 11 controls the operation of the system
Clear the memory. Note that C ₁ and C ₂ are usually values corresponding to a time of 80 to 200 msec, depending on the mechanism used.

On the other hand, when the next signal is detected at time t ₃ before reaching C ₂ as shown in FIG. 2, if “not less than C ₁ ” is not stored in the count value determination means 10, then it is not detected. The signal part is ignored, the value of the first counting means 2 is cleared (steps 21 to 23 in FIG. 3), and if “greater than or equal to C ₁ ” is stored, steps 21 and 22 in FIG. The current high-speed traveling mode is stored in the control means 11 by the processing of 23, and the mechanism 12 is set to the reproduction mode via the control means 11.

On the other hand, the inter-track distance judging means 3 is set to the reproduction mode and the value of the reel base rotation cycle at the time of high speed traveling stored in the second cycle storage means 7 by the rotation detection means 4 and the second counting means 5. From the value of the reel base rotation cycle at the time of reproduction, which is later stored in the first cycle storage means 6, and the value of the no-signal time during high speed traveling, which is stored in the first counting means 2, , A calculation for converting a no-signal time during high-speed running into a corresponding value at the time of reproduction, and a judgment means 9 for judging the calculation result of the calculation means 8 and a no-signal portion at the time of reproduction at the time of reproduction. A value C ₃ corresponding to the minimum time (usually, a value corresponding to about 3 seconds) is compared, and if C ₃ or more, “between songs”, and if less than C ₃ , “not a song”. Control means 11 for determining
The mechanism 12 is controlled via. When it is less than C ₃ , the control means 11 returns to the high-speed traveling mode.

The above operation is performed by steps 31 to 41, 29or42 in FIG.
It is realized by the processing of. Regarding the contents of calculation of the calculating means 11, the reel base rotation period T ₂ during reproduction, the reel base rotation period T ₁ during high speed traveling, and the no-signal time τ during high speed traveling are expressed as τ × (T ₂ / T ₁ ). Corresponding calculations are performed to calculate the corresponding no-signal time during reproduction.

As described above, according to the present embodiment, the count value determining means 10 performs the inter-track determination by setting the first and second constants as inter-track determination times corresponding to the maximum and minimum tape speeds. , If the count value of the first counting means 2 for counting the no-signal time is less than the first constant, it is "not between songs", and if it is more than the second constant, "it is between songs". It can be performed irrespective of the speed, and if it is equal to or more than the first constant and less than the second constant, the inter-track determination means 3
Thus, by performing the determination by converting the no-signal time during high-speed running at the time of reproduction, it is possible to perform an accurate inter-track detection operation according to a change in tape speed.

EFFECTS OF THE INVENTION As described above, the present invention provides the signal detecting means for determining the presence / absence of a signal with the counting means for counting the no-signal time, and corresponds to the count value the maximum speed and the minimum speed during high-speed traveling. By setting the first and second constants as the inter-track determination time and providing the count value determining means for performing the inter-track determination, if it is less than the first constant, "not a inter-track", or more than the second constant. If so, it can be judged that it is "between songs" regardless of the tape speed. Further, if it is equal to or more than the first constant and less than the second constant, the no-signal time detected during high speed running is determined by the tape speed ratio. By providing a music interval determination means for performing determination by converting to a corresponding value at the time of reproduction, it is possible to realize a music interval detection operation corresponding to a change in tape speed. It is possible to prevent the phenomenon that the silent part in the song is judged to be the interval between songs at a position where the speed is small and it malfunctions,
It is possible to realize an excellent tape recorder having a high-precision cueing function.

[Brief description of drawings]

FIG. 1 is a block diagram of a tape recorder in one embodiment of the present invention, FIG. 2 is a timing chart showing an operation example,
FIG. 3 is a flowchart showing the processing contents of each unit. DESCRIPTION OF SYMBOLS 1 ... Signal detecting means, 2 ... 1st counting means, 3 ... Music interval judging means (composed of each part of 4-9), 4 ... Rotation detecting means, 5 ... 2nd counting means , 6 ... First cycle storage means, 7 ... Second cycle storage means, 8 ... Calculation means,
9 ... Judgment means, 10 ... Count value judgment means, 11 ... Control means, 12 ... Mechanism.

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 A judging means for judging whether or not there is a space between songs, and a minimum time for judging no signal as a space between songs, the value at the time of reproduction is converted into a corresponding value at the time of maximum and minimum tape speed during high-speed running. , A second constant is set, and if the count value of the counting means is smaller than the first constant, it is determined that "it is not between songs", and if it is not less than the second constant, "it is between songs", A tape recorder comprising: a count value determining means for instructing the inter-musical distance determining means to perform inter-musical distance judgment if the first constant is equal to or larger than the second constant.