JPH0341907B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to recording cancellation (retsuku cancel).
The present invention relates to a tape recorder having functions.

Prior Art A tape recorder that has a recording cancel function that rewinds the recording tape to the recording start position of the recording content and puts it in a recording standby state when the recorded content becomes unnecessary or if you want to re-record the recorded content. There is.

Conventionally, in tape recorders that have such a recording cancel function, when the cancel button is pressed after recording has started, rewind running is started to rewind the recording tape and erase the recording recorded on the tape. The signal was observed, and when a certain period of non-recording was detected, the non-signal detection circuit sent a pulse signal to the drive circuit, stopping the rewind run and placing the device in recording standby mode.

However, such a conventional recording cancellation method may cause the following malfunction.

(b) If you press the rect cancel button immediately after starting recording, the unrecorded part before the start of recording cannot be detected, and the unrecorded part of the previous recording may be detected by mistake. The camera may go into recording standby mode.

(b) If the unrecorded portion is too short during the recording cancellation operation, it may not be detected and the same malfunction as in (b) above may occur.

(c) If the recorded content is a narration (human voice), the system may detect a broken part of the narration and enter a recording standby state at that point.

(d) Even if the correct unrecorded part is detected, the error in the stopping position is large because the machine stops after rewinding.

Purpose This invention was made by paying attention to the problems with the conventional recording cancellation method, and aims to eliminate the above-mentioned malfunction and deviation of the stop position during the recording cancellation (retsuku cancel) operation. shall be.

Configuration Therefore, in the tape recorder having the recording cancel function according to the present invention, the counting circuit that counts the progress of the recording tape detects a non-recording signal for a time longer than a preset time by the non-signal part detection circuit at the start of recording and during recording. Each time a state is detected, the count value at that time is stored, and when a recording cancellation command is issued by the recording cancellation command means, the counter circuit repeats the recording tape up to the last stored count value. The film is rewound, and the mechanism section is placed in a recording standby state.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in the figure, three blades 5 are provided at equal angular intervals on a reel stand (drive shaft) 4 on the cassette deck side that rotates the reel 3 on which the recording tape 2 of the tape cassette 1 is wound. A photo sensor 6 composed of a light emitting element and a light receiving element facing each other with a blade in between is provided.

The photo sensor 6 generates a pulse each time the blade 5 passes due to the rotation of the reel stand 4, and sends it to the counter circuit 7 as a counter pulse CP corresponding to the progress of the recording tape 2.

The counter circuit 7 counts up the counter pulse CP in response to the up signal UP sent from the drive circuit 8 in the recording mode, and counts down the counter pulse CP in response to the down signal DW sent in the rewind mode. It has a function of storing the count value at the time when the play key is pressed at the start of recording and when a detection signal is inputted as a memory instruction signal ME from the no-signal portion detection circuit 9, which will be described later.

The no-signal portion detection circuit 9 is constituted by a timer whose timer time is set to a predetermined time in advance, and is operated by the recording mode signal REC from the drive circuit 8.

The no-signal detection circuit 9 inputs the source input signal REC IN during recording, starts a timer when the input signal falls, and then the next input signal does not rise within the set time. In this case, it is determined that there is no signal, and a detection pulse signal, that is, a memory instruction signal ME is output to the counter circuit 7.

The drive circuit 8 outputs various drive signals in response to the mode selection signal output in response to the operation of each operation key (not shown), the restore pause signal R/P, and the rewind signal REW from the counter circuit 7, and controls the reel stand. The controller 4 controls mechanical parts (not shown) such as a motor that drives the motor 4.

Reference numeral 10 denotes a recording cancel command signal generation circuit using a switch or the like, which generates a recording cancel command signal RC and inputs it to the counter circuit 7 when the read cancel key 11 is pressed.

Next, a recording cancel operation according to this embodiment will be explained.

At the start of recording, the record key and the play key are pressed in the same way as in conventional tape recorders, and when the play key is pressed, the counter circuit 7 stores the count value at that time.

After the recording starts, the counter circuit 7 counts the counter pulse CP from the photo sensor 6 to count the progress of the recording tape.
When the source input signal remains in a no-signal state for a period of time preset by the no-signal portion detection circuit 9, the no-signal portion detection circuit 9 detects it and outputs the memory instruction signal ME to the counter circuit 7. stores the count value at that time in place of the previously stored value.

In this way, the counter circuit 7 updates its memory contents each time the no-signal portion detection circuit 9 detects a no-signal portion.

When the read cancel key 11 is pressed, the recording cancel command signal generating circuit 10 generates a recording cancel command signal RC, and when the counter circuit 7 inputs it, a rewind signal is sent to the drive circuit 8.
Send REW.

Thereby, the drive circuit 8 outputs a drive signal for rewinding and brings the mechanical section into a rewinding state. At the same time, the drive circuit 8 sends a down signal DW to the counter circuit 7, so that the counter circuit 7 counts down the counter pulse CP from the photo sensor 6.

At this time, the counter circuit 7 compares the currently down-counted count value with the last stored count value, and when the contents of these two counters match, it sends a restore pause signal R/P to the drive circuit 8. Output.

As a result, the drive circuit 8 outputs a drive signal for recording standby, thereby placing the mechanical section in a recording standby state.

Therefore, when the read cancel key is pressed, only the recorded portion of the series of contents being recorded is rewound and the recording standby state is entered at the beginning.

That is, in this embodiment, the counter circuit 7 and the drive circuit 8 also serve as drive control means.

Further, in this embodiment, a signal from the play key is used as a memory command to the counter circuit 7 at the time of starting recording, but a signal from the resume pause key may also be used.

Effects As described in the embodiments above, in the tape recorder having the recording cancel function according to the present invention, the recording tape stop position at the time of recording cancellation is stored in advance by detecting the no-signal state of the source input during recording. Therefore, it is possible to significantly reduce malfunctions due to detection failures, which conventionally occur due to detection of non-signal portions during rewinding.

Furthermore, since the stop position is determined by detecting a no-signal state during recording, there is a margin of time relative to the running speed of the recording tape 2, and the error in the stop position can be significantly reduced.

Also, even if the recorded content is narration etc.
This prevents the device from malfunctioning, such as entering a recording standby state at a point where the voice is cut off.

In other words, in the conventional method, the setting time of the no-signal detection circuit is determined because the tape speed during rewinding has a range of 20 to 30 times the speed during recording or playback. Assuming the signal part is 2 seconds, the detection circuit setting time is 1/20~
Considering the worst condition (when the tape running speed is the highest), the setting time is 1/30 of the normal 2 seconds.
Make it.

Therefore, if the rewind running speed at the time of detection is 20 times that of recording running, a malfunction will occur because even a short no-signal portion of 2 seconds or less will be detected.

However, according to this invention, since the no-signal portion is detected in a recording state where the tape is always running at a constant speed,
The setting time of the detection circuit can be set more precisely, thereby preventing the above-mentioned malfunctions.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. 1...cassette tape, 2...recording tape, 3
... Reel, 4... Reel stand, 5... Feather, 6...
... Photo sensor, 7 ... Counter circuit, 8 ... Drive circuit, 9 ... No-signal portion detection circuit, 10 ... Recording cancellation command signal generation circuit, 11 ... Rec cancel key.

Claims (1)

[Claims] 1. In a tape recorder, there is a no-signal part detection circuit that outputs a detection signal when a no-signal state for a preset time or more is detected during recording, and a no-signal part detection circuit that counts the progress of the recording tape and detects the no-signal part when recording starts and the no-signal part. a counter circuit having a function of storing a count value at that time when a detection signal is input from the detection circuit; a recording cancellation command means for commanding recording cancellation; and a recording cancellation command that is issued by the recording cancellation command means during recording. A tape recorder having a recording canceling function, characterized in that it is provided with a drive control means which rewinds the recording tape to the last count value stored by the counter circuit and puts the mechanism section into a recording standby state when the counter circuit is issued.