JPH0328754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic fade-out recording device in a tape recorder that erases a portion of recorded content on a previously recorded magnetic tape and automatically fades out recording of a longer content.

Some conventional tape recorders were equipped with a fade-out device called an auto fader, but the start of the fade-out had to be entered manually. If you try to erase a longer song (representatively referred to as a ``song'') and then apply a fade-out to record a longer song, you will have to rely on the tape counter to start the fade-out, which may result in incorrect operation due to counter misalignment, etc. There was a risk that the previous song would remain or the beginning of the next song would be erased.

In the case of a tape recorder without a fade-out device, it is necessary to manually gradually reduce the recording level after starting the fade-out, which requires considerable skill.

The present invention eliminates the troublesome operation and fear of erroneous operation, and provides a tape recorder equipped with a control circuit that switches and controls the running of the magnetic tape and the recording/playback state according to input signals. The purpose is to erase part of the recorded content on a tape and record new content in its place with automatic fade-out.

Therefore, in the tape recorder, the present invention starts fast-forwarding the tape by turning on the first key switch, stores the fast-forwarding start point, and stores the fade-out starting point when an unrecorded section between songs is detected. and rewind the tape.
It stops at the fast-forward start point and enters recording standby, then turns on the second key switch to start recording, and then automatically starts fade-out from the previously memorized fade-out start point.
To provide an automatic fade-out recording device that finishes recording before reaching a non-recorded part between songs.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and the usual recording/reproducing circuit, magnetic tape drive circuit, etc. of a tape recorder are omitted from illustration.

Control circuit 1 manages the system control of the tape recorder, and controls FF, REW, STOP, REC PAUSE,
Controls the plunger or cam motor that operates the reel motor, capstan motor, headblock, etc. according to the REC PLAY and PLAY trigger input signals to fast forward, rewind, and stop the magnetic tape running and recording/playback status. , recording standby, recording, and playback states.

When the first key switch KEY1 is turned on, it turns on the transistor _Q1 and inputs the fast forward start signal FF to the control circuit 1.

When the second key switch KEY2 is turned on, it turns on the transistor _Q2 and inputs the recording start signal REC PLAY to the control circuit 1.

Reference numeral 3 designates a magnetic tape, 4 a playback head, and 5 a recording head.A non-recorded portion detection circuit 6 rectifies and smoothes the playback signal from the playback head 4, and when the output falls below a predetermined level, detects an already recorded magnetic field. An unrecorded portion between songs on the tape is detected and a rewind start signal REW is input to the control circuit 1.

During normal recording, the fade-out circuit 7 passes the recording signal as it is, inputs it to the recording head 5, and records it on the magnetic tape 3, but during fade-out operation, the fade-out circuit 7 gradually attenuates the recording signal and outputs it, reducing the recording level to zero. At the end of the narrowed fade-out, a stop signal STOP is output to the control circuit 1.

The counter 8 resets its count value in response to a fast-forward start signal when the first key switch KEY1 is turned on, or resets the count value at that time.
CS is memorized, and a pulse generator (not shown) starts adding up tape running pulses TP generated every fixed running distance of the magnetic tape 3. When a non-recorded section is detected and the rewind start signal REW is input to control circuit 1, the maximum count value at that time
A value obtained by subtracting a predetermined count value CF required for fade-out from CE (CE - CF) is stored as a count value at the fade-out start point, and then subtraction counting of tape running pulses during rewinding is started.

Then, when the count value reaches zero or the value CS stored at the start of fast forwarding, the recording standby signal REC PAUSE is input to the control circuit 1, and when the count value reaches CE-CF during recording, the fade-out circuit 7 starts operating. Input signal FAD.

Next, the operation of this embodiment will be explained with reference to the diagram of FIG.

Before starting recording, set the pre-recorded magnetic tape 3 and locate the beginning of the song that can be erased.
When key switch KEY 1 is turned on, the counter 8 stores the current count value CS (CS = 0 in the case of reset), and then the control circuit 1 puts the tape recorder in fast forward mode, so the counter 8 stores the current count value CS. Add and count the running pulse TP.

When the recorded magnetic tape 3 is fast-forwarded to the end of one recorded song, the unrecorded portion detection circuit 6 detects the unrecorded portion between the songs, and the control circuit 1 is thereby detected.
The magnetic tape 3 temporarily stops running and then switches to rewinding. During this time, the counter 8 calculates the value (CE - CF) obtained by subtracting the predetermined count value CF required for fade-out from the maximum count value CE at that time. After memorizing, the tape running pulse TP during rewinding is subtracted and counted.

When the count value reaches CS (or "0" if reset at the start of fast forwarding), the control circuit 1 stops running the magnetic tape 3 and puts the tape recorder into recording standby in response to the recording standby signal REC PAUSE from the counter 8. state.

Therefore, when the second key switch KEY2 is turned on, the control circuit 1 starts recording, and the recording signal passes through the fade-out circuit 7 and is output to the recording head 5.
is input and recorded on magnetic tape 3.

At this time, it goes without saying that the previously recorded contents are sequentially erased by an erase head (not shown).

The counter 8 adds and counts the tape running pulses even during recording, and the count value is CE-
When the CF is reached, the fade-out circuit 7 starts operating and gradually attenuates the recording signal to perform a fade-out.

When the recording level reaches zero and the fade out ends, a stop signal is sent from the fade out circuit 7.
STOP is output, and the control circuit 1 stops the running of the magnetic tape 3 to bring the tape recorder into a stopped state.

In addition, the stop signal from the fade-out circuit 7
It is not necessary to output STOP, and in that case, when the unrecorded part detection circuit 6 detects the unrecorded part between songs, it will enter the rewind state and enter the recording standby state at the recording start position, so that the control circuit 6 to play start signal
If you input PRAY, you can immediately play the recorded content.

The recorded content of pre-recorded magnetic tape is not limited to music, but if multiple content is recorded consecutively via an unrecorded section, some of the recorded content can be erased to create new content. It can be applied when trying to record.

Note that a preset counter 9 is inserted on the output side of the unrecorded portion detection circuit 6, as shown by the broken line in FIG. If this is preset, this function will be used when the unrecorded part detection circuit 6 detects an unrecorded part between the last recorded content that can be deleted and the next recorded content, in the same way as the conventional search function. By causing the preset counter 9 to output an output signal, new content can be recorded with automatic fade-out in place of a plurality of consecutive previously recorded content.

As explained above, according to the present invention, after locating the recording content that can be erased on a previously recorded magnetic tape, the first key switch is turned on to perform fast forwarding and rewinding. If you turn on the second key switch and start recording, there is no need to monitor the tape counter while recording, and the tape will automatically fade out from the desired point and start a new recording at the end of the recording, which can be erased. You can end the recording.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flow diagram showing the operation thereof. DESCRIPTION OF SYMBOLS 1... Control circuit, 3... Magnetic tape, 4... Playback head, 5... Recording head, 6... Unrecorded portion detection circuit, 7
...Fade out circuit, 8...Counter, KEY1
...First key switch, KEY2...Second key switch.

Claims (1)

[Scope of Claims] 1. A tape recorder equipped with a control circuit that switches and controls running and recording/playback states of a magnetic tape according to an input signal, comprising: a first key switch that inputs a fast forward start signal to the control circuit; an unrecorded portion detection circuit that detects an unrecorded portion of a recorded magnetic tape and inputs a rewind start signal to the control circuit; a second key switch that inputs a recording start signal to the control circuit;
a fade-out circuit that gradually attenuates the recording signal input to the recording head, and a count value that is reset or stored in response to a fast-forward start signal from the first key switch and starts adding and counting tape running pulses; A value obtained by subtracting a predetermined count value from the maximum count value at that time in response to a rewind start signal from the unrecorded portion detection circuit is stored as a count value at a fade-out start point, and subtraction counting of tape running pulses during rewinding is started; When the count value reaches zero or the value stored at the start of fast forwarding, a recording standby signal is input to the control circuit, and when the count value reaches the value stored as the count value at the fade-out start point during recording, the fade-out circuit is activated. An automatic fade-out recording device consisting of a counter that outputs a signal to start the operation.