JPH0369065A - tape recorder device - Google Patents

Abstract

PURPOSE:To ensure a fade-out operation by making a ratio x of the inverse number of angular velocity of a supply reel to the inverse number of angular velocity of a take-up reel less than a ratio x' of the inverse number of subsequent angular velocity of the take-up reel to the inverse number of subsequent angular velocity of the supply reel. CONSTITUTION:Time for counting a prescribed number of pulses after a fixed time after commencing sound recording is measured to the time of S on the supply side and the time of T on the take-up side respectively, and the ratio of both time; x=S/T, i.e. the ratio of the inverse number of angular velocity of the supply reel to the inverse number of angular velocity of the take-up reel is calculated by an angular velocity ratio calculating device 51 and stored in a memory 52. Subsequently, the inverse number of x as to be x' is calculated continuously during recording, and x' is compared with the previously stored x by a comparison/detection device 53. Then, a recording input volume 6 is controlled upon detection of x'>x. By this method, the fade-out operation is surely performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fade-out circuit for a tape recorder, and particularly improves the fade-out operation at the end of the tape.

[Prior Art] Conventionally, recording/playback equipment such as a tape recorder has performed a so-called fade-out operation in which the level gradually decreases at the end of a song or the end of a tape. To do this, the recording level was manually adjusted as the end of the song or the end of the tape was approached during recording.

[Problems to be Solved by the Invention] Therefore, when manually adjusting the recording input level, the rate of decrease in the level becomes irregular, and especially when fading out at the end of the tape, the remaining portion of the tape is always affected. This requires complicated operations such as monitoring the volume with a tape counter or the like and adjusting the recording level accordingly, which poses a problem of lack of simplicity. It has also been proposed to gradually increase the erasing current during playback of a recorded tape to perform a fade-out operation, but due to magnetic properties, the erasure rate in the high range is larger than in the low range, so the reproduction of vocal [Means for solving the problem] This invention involves winding the entire tape onto a supply reel prior to recording, and detecting the angular velocity of the supply reel and the pick-up reel in the subsequent recording state. Then, after a certain period of time from the start of recording, calculate the ratio χ of the reciprocal of the angular velocity of the sub reel/the angular velocity of the pick-up reel, and after storing the χ, calculate the ratio χ of the angular velocity of the pickup reel, which is the reciprocal of χ, This tape recorder device calculates the reciprocal ratio χ' of the angular velocity, compares it with the above-mentioned χ, and generates a control signal when χ' becomes % or more, and the recording input level is gradually increased by the control output. This tape recorder device is characterized in that the tape recorder is controlled so that the number of digits decreases.

[Function] After the start of recording, the angular velocity ratio of the supply reel and the pick-up reel after the time required to perform fade-out at the end of the tape is calculated and stored, and when the reciprocal value of the angular velocity ratio becomes equal to or greater than the angular velocity, When approximated, the remaining amount of tape on the supply reel approximates the amount necessary for the fade-out.

[Example] In Fig. 1, la is a supply reel stand, and 1b is a supply reel stand.
is a take-up reel stand.

Reflective portions 11a and non-reflective portions 12a are alternately formed radially on both reel stands 1a11b.
The reflective parts are usually printed in silver and the non-reflective parts are printed in black. In the embodiment, five reflective portions 11a and non-reflective portions 12a are alternately formed on each reel stand.

2a and 2b are light emitting elements that irradiate light onto the reel stand, and 3a and 3b are light receiving elements that receive light reflected from the light emitting element on the reel stand, and the light from the light emitting elements is reflected by rotation of the reel stand. A signal is generated by receiving the light reflected by the portion, and then shaped into a pulse wave by waveform shaping circuits 4a and 4b. The angular velocity detection circuit of the reel stand is known as a device for detecting the end of a tape, etc.

Further, it is obvious that the value of the angular velocity of the reel stand is proportional to the tape winding outer diameter, that is, the remaining amount of tape on each reel.

The pulse output of each of the waveform shaping circuits is input to the CPU 5 as a rotation pulse signal of the reel stand. Said CPU
5 has a recording input control signal output terminal, and the recording hole capacitor is controlled by the output.

Next, to explain the operation, first, the entire tape is wound up on the supply side by a rewinding operation. Next, the recording operation is started. After a certain period of time has elapsed after the start of recording (the certain period of time is set as the time necessary to perform the fade-out operation at the end of the tape), for example, 20 seconds (the elapse of this time is performed by the internal clock operation of the CPU). , measure the outer diameter of the tape wound on the supply side and the take-up side.

This is done by measuring the time it takes for each reel stand to rotate once from each rotation pulse input to the CPU, that is, the angular velocity of each reel stand.

That is, as shown in FIG. 2, the time at which five pulses are counted each after a certain period of time after the start of recording is measured, and if the time on the supply side is 31 and the time on the take-up side is T, then the angular velocity calculation means 51 calculates the Time ratio χ=S/T
That is, the reciprocal of the angular velocity of the pick-up reel is calculated and stored in the memory 52.

Next, during recording, the reciprocal of χ-=T/S, that is, the reciprocal of the angular velocity of the supply reel, is calculated, and the comparison/detection means 53 compares χ' with the stored χ, and determines that χ' is % or more is detected, and upon this detection, the recording hole capacity control is controlled so that the recording input level gradually decreases. That is, when χ' is % or more, it indicates that there is a remaining amount of tape on the supply side that can be used for a certain period of time (20 seconds) necessary for performing fade-out.

Figure 3 shows an improved means of calculating χ' in order to more accurately detect when χ' has exceeded %. This is a means of measuring based on two points that are 180° apart from each other. That is, on the supply side, the time from the rising edge of the first pulse to the rising edge of the next 5th pulse is S l
-1 is measured.

Similarly, SI-2, SI-3, . . . are measured.

On the other hand, starting from the fall of the third pulse from the first pulse on the supply side, the time 52-1 from the fall of the next fifth pulse is measured, and in the same manner, the time 52-2 is measured.
．． 52-3...Measure.

The measured values are S l-1, S 2-1, S l-2,
S2-2.5r-3 and 52-3 are sequentially rewritten in the memory.

On the other hand, the take-up side is also T+-+, T2-+.

T1-2... are measured sequentially, and each T, -1. T
2-. , T, -2 is the angular velocity ratio χ′ between the latest measured value on the supply side, that is, the value currently in memory.
are compared, and when χ' becomes % or more, control of recording input is started as described above.

More specifically, when T 2-0 is measured, the measured value is calculated between the latest value S 2-0 on the supply reel side, and when T +-+ is measured, the measured value is calculated between the latest value S 2-0 on the supply reel side. When T2-1 is measured, calculation is performed between it and the latest value 51-3 on the supply reel side.

According to this, at the end of the tape, the outer diameter of the tape on the pick-up reel side becomes larger, and the time for one rotation of the reel stand becomes longer (about 3 to 4 seconds), resulting in a maximum of about 3.4 seconds. Although it is expected that an error of 1.7 seconds will occur, if the above-mentioned method is used, it is possible to suppress the error to within 1.7 seconds at maximum.

[Effects of the Invention] This invention described above has the effect that the time required for fade-out at the end of the tape winding can be accurately set to the time set after the start of recording, thereby ensuring the fade-out operation and simplifying the operation. have

Although the present invention has been described in the case where it is applied to a fade-out device, it can also be applied to the end detection of auto-reverse, that is, by setting the certain period of time to several seconds, the invention can be applied from the end of the tape to the end of the tape several seconds before the setting. It is possible to detect the position of and generate an auto-reverse signal.

In the present invention, various means have been proposed for the reel platform angular velocity detection means in addition to the embodiments, and these means can be employed in place of the embodiments.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the invention, FIG. 2 is a waveform diagram illustrating angular velocity detection, and FIG. 3 is a waveform diagram illustrating another means for calculating the angular velocity ratio.

Claims (1)

[Claims] [1] (1) Means for winding the entire amount of tape onto a supply reel prior to recording. (2) Means for detecting the angular velocity of the supply reel and take-up reel in the recording state. (3) Calculate x = reciprocal of the angular velocity of the supply reel/reciprocal of the angular velocity of the take-up reel after a certain period of time after the start of recording, and calculate the x (4) After storing said χ, means for calculating x' = reciprocal of the angular velocity of the take-up reel/reciprocal of the angular velocity of the supply reel and comparing it with said x. What is claimed is: 1. A tape recorder device, characterized in that it detects that x is greater than or equal to x, and uses the detection signal as a control means. [2] The tape recorder apparatus according to claim 1, wherein the control means controls a recording input control means that gradually reduces the recording input.