JPS6238546A - cassette tape deck - Google Patents

Abstract

PURPOSE:To exhibit auto-reverse function by detecting the absence of reproduced output if the reproduced output does not exist over a certain time during tape running for reproducing, then fast forwarding automatically the tape, and detecting the end of the tape and reversing tape running automatically to restart reproducing. CONSTITUTION:When a cassette tape CT is driven forward, left and right outputs in the forward side of a head H are inputted to left and right audio amplifiers AL and AR through a switching gate SG by a signal FS indicating this state and are amplified there. Levels OL and OR are detected and are given to a NOR gate G1, and the output is '0' if either of inputs is '1', but the output is '1' to start a timer T if both inputs are '0'. Since a blank continued normally for several - several tens seconds between pieces of music or movements, the timer does not expire for parts between pieces of music or movements but expires only for the end of recorded contents if the timer is set to 15-20sec; and when the timer expires, a monostable multivibrator MM2 is operated and the output is given to a fast forwarding signal input FF. Thus, the blank time is minimized to eliminate defects of an auto-reverse mechanism.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a cassette deck.

[Prior art]

As prior art to this invention, there is a well-known auto-reverse mechanism. When the playback of the sticky tape in one direction (overlapping recording) is completed, the running of the tape is automatically reversed and the tape is played back in the opposite direction (and a whistling sound), thereby eliminating the need to turn over the cassette.

[Problem that the invention seeks to solve]

However, tape decks employing this conventional mechanism often suffer from inconveniences during playback. The reason for this is that the length of the content recorded on the tape is different between the front and back sides. For example, the first and second movements of a symphony are on the front side, and the third movement is on the front side. If the fourth movement is recorded on the back, and the sickle length is longer on the front than on the back, there is no problem because the tape will end shortly after the end of the second movement, and the tape will automatically reverse and proceed to the third movement. However, in the opposite case, and if the difference is large, there will be a long blank period from the end of %22 Raku until the end of the tape, which will significantly reduce the excitement of the tape. There was a problem in that the automatic reverse feature would not be fully utilized as the reverse side would have to be started manually after the reverse side was stopped.

This invention was made to solve the above-mentioned problems, and when the playback of one side of the tape is completed, which requires manual continuous feeding, the tape is automatically fast-forwarded to the end.
The purpose of this invention is to provide a cassette tape deck that can perform reverse playback.

[Means for solving problems]

When the cassette tape deck according to the present invention does not produce a playback output for more than a certain period of time while the tape is being played back and fed, it detects this fl and automatically switches to the tape retreat @ production to speed up and advance the tape. Furthermore, the tape end is detected and the tape feeding is automatically reversed to restart playback.

[Effect]

In this invention, if there is no playback output for a certain period of time while the tape is being played back, it is determined that the recording portion on that side of the tape has ended and it is π, and the tape is automatically fast-forwarded to the tape end and the tape end is detected. Since the playback is reversed, there is no need for human intervention (,
Also, the auto-reverse function can be fully utilized without sacrificing excitement.

〔Example〕

The figure is a circuit diagram showing the configuration of an embodiment of the present invention. In the figure, CT is a cassette tape, H-side head 1. DM
In the drive mechanism (including control circuit), FF, F.

Forward continuous feed and forward playback for R, FR and S.

Reverse playback, reverse continuous feed and stop signal input, FS,
R8 and Eij output signals for forward playback, reverse playback, and end of forward tape, respectively. SGI/-i cutting blade,
LDI, LD2Lri level detector, Gld N
OR gate, T-timer, MMI I MM2 r
MM31) A: M4 is a monostable multivibrator (hereinafter abbreviated as monomulti), Mke memory, G2. G4 OR gate, G3 AND gate with inhibit terminal,
SFF, Sp, axis, IJ'R and SSP'i forward playback and reverse playback respectively.

This is a switch for manual operation of continuous feed in the reverse direction and stop.

Next, the operation of this embodiment will be explained. When the cassette tape CT is attached to the drive mechanism DM and the forward playback switch SP is fully operated, the signal 8 is input from the input terminal F, and the tape is driven in the forward direction. %
Due to the FS, the left and right outputs of the head H in the forward direction are applied to the left and right sound NOR gates Gl, respectively, via the switching gate sG. NOR game) What is the input value of Gl?'1
"If the output level is OI+, both are 1Q'
If it becomes 1, the output becomes 1° and the timer T is activated.

Regarding the time limit of timer T, there is usually a gap of about 10 seconds between songs or movements.

If you set it to 15 to 20 seconds, there will be no timeout between songs or movements, and when the recording content is finished, the timeout number will be reached, and the output will be a mono multi-MM.

is operated, and its output is applied to the fast feed signal input FF via the gate G2 to cause the fast feed movement ff' to be performed.

When the tape reaches the end due to the fast feed operation, a signal K indicating the end of the tape in the forward direction is output and the monomulti MM3 is operated.
The output is reproduced in the reverse direction (
M 55 inputs are not applied and the cassette tape (IT is driven in the reverse direction. During the reverse direction drive, a signal to that effect is
s, the left and right outputs on the opposite side of the head H are switched to the switching gate S.
The signal is input to the left and right audio amplifiers ALI and AR via G, respectively, and is reproduced in the opposite direction.

Here, although the signal R8 during reverse direction drive is included in the timer T, all of the above operations are not required during reverse direction playback, so the timer T? Keep it in the reset state (this is for
Also, the signal of the forward playback operation switch SF is mono multi MMl'? Forward playback initial I
This is to prevent the timer T from operating in the evening while the audio signal is not visible, for example, after operating the switch.
If the monotrich MMx output is output for 0 seconds, the C audio signal will be present at f7 during that time, and the rest of the operation will be as described above.

Also, is memory M and gate G3 fast forwarding operation? This is done manually for tape winding, etc., and is normally unnecessary for subsequent automatic reversal playback.The state is stored in the memory M, and the tape end signal E is used to perform mono-multi play) AM3
Even if the output is output, it is to be suppressed by G3's Inhibit I child. When the output of Mono Multi 1 and Sign 13 is finished, Mono Multi MM4 will release IfIr f'E and release the memory of memory M to return to the original state. to return to.

The following description is based on one example only, and it goes without saying that other configurations are possible based on the spirit of the present invention.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, even when playing back a tape in which the contents on the front side are shorter than the contents on the back side, the blank time Is can be reduced, thereby eliminating all the drawbacks of the auto-reverse mechanism.

[Brief explanation of the drawing]

The figure is a circuit diagram showing the configuration of the -T only example of this invention.
, OR is the reproduction output, LDL, LDR level detector,
T-timer, G, NOR gate, G2, G4
(d OR gate, G3 AND gate, MMI −
MM4 beast multi, FF is forward direction continuous feed signal input, R
E is the key signature input for reverse playback, and E is the forward tape end signal output.

Claims (2)

[Claims] (1) With a tape cassette attached, run the tape in one direction to play the recording on one side, and run the tape in the other direction to play the recording on the other side. , a level detection timer circuit that runs the tape in one direction and detects that the tape playback output is not obtained for a predetermined period of time during tape playback; when the output of this level detection timer circuit is received, the tape is A cassette tape characterized by being equipped with a circuit that rapidly feeds the tape in one direction, and a circuit that detects the end of tape running and automatically reverses the running direction of the tape to reproduce the recording on the other side. deck. (2) The level detection timer circuit consists of playback level detectors for both left and right channels of the tape, a NOR gate that takes the outputs of these playback level detectors as two inputs, and a timer that is activated by the output of this NOR gate. A cassette tape deck according to claim 1, characterized in that: