JPH0411223Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cassette tape recorder, and more particularly to a cassette tape recorder that performs fade-in recording during timer recording.

[Prior art]

Until now, there has been no cassette tape recorder capable of timer recording that also has a fade-in function.

For this reason, the timer recording section and the fade-in section were separated as shown in FIGS. 2a and 2b. That is, as shown in FIG. 2a, in the timer recording section, the output of the power supply circuit 1 rises at a predetermined set time due to the timer operation, and the timer output generating section 2 generates a low potential output at the rise of this output. When the setting switch 5 is previously set to timer recording, a low potential output is supplied to the recording instruction input and the playback instruction input of the operation key switch input section 3, and a recording and playback instruction signal is supplied to the mechanism operation output section 4. is supplied, and the cassette tape recorder is put into recording mode. Further, the fade-in section generates unit pulses from the pulse generating circuit 7 when the fade-in switch 10 is turned on with the fade switch 11 turned on as shown in FIG. 2B. This unit pulse is integrated by an integrating circuit 8, converted into a sawtooth voltage, and supplied to an electronic volume 9. A recording input signal supplied from the input terminal to a noise reduction circuit such as a Dolby circuit is faded in.

However, when using the conventional tape recorder as described above, the timer recording and fade-in functions are independent, so there is a problem that the sound rises sharply during timer recording and when recording starts, which may cause discomfort during playback. It was hot.

[Purpose of invention]

The present invention has been developed in consideration of the above problems, and it is a cassette tape that eliminates the drawbacks of the conventional method by fading in during timer recording and gradually rising to the specified recording level. The purpose is to provide a recorder.

[Example of idea]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

In one embodiment of the present invention, the same components as in the conventional example shown in FIG. 2 are denoted by the same reference numerals.

In one embodiment of the present invention, the configuration of the power supply circuit 1, timer output generation section 2, operation key switch input section 3, mechanism operation output section 4, setting switch 5, and operation key switch 6 is the same as that shown in FIG. 2a. It is the same as in the case, 5 ₁ is the recording setting contact, 6 ₁ is the recording setting contact
62 indicates the recording instruction key switch, and 6 ₂ indicates the playback instruction key switch. Further, the configurations of the pulse generator 7, the integrating circuit 8, the electronic volume 9, the fade-in switch 10, and the fade switch 11 are the same as in the conventional case shown in FIG. 2b.

In one embodiment of the present invention, the output of the timer output generator 2 is further supplied to an inverter 36 for inversion, and the flip-flop 33 is set by the output of the inverter 36. Flip Flop 33 Q
The output and the output of a tape detection circuit 32 for detecting the tape are supplied to a NAND gate 34, and the output of the NAND gate 34 is supplied to the pulse generator 7 together with the output of the fade-in switch 10. Further, the output of the NAND gate 34 is inverted by an inverter 35 and output from the flip-flop 33.
Reset.

The operation of one embodiment of the present invention configured as described above will be explained.

Power supply circuit 1 is turned on at a predetermined time by timer operation.
The output rises. At this rising output, the timer output generation section 2 generates a low potential output. If timer recording has been previously set by the setting switch 5, a low potential output is supplied to the recording instruction input and the playback instruction input of the operation key switch input section 3, and a recording and playback instruction signal is supplied to the mechanism operation output section 4. is supplied, and the cassette tape recorder is put into recording mode.

The low potential output from the timer output generator 2 is inverted by the inverter 36 and sets the flip-flop 33. As a result, a high potential output is input to the NAND gate 34. On the other hand, when the cassette tape driven in the recording state is the leader section, the tape detection circuit 32 generates a low potential output, which is input to the NAND gate 34. Therefore, when the cassette tape is the leader tape portion, the output of the NAND gate 34 is at a high potential, does not affect the pulse generator 7, and the electronic volume 9 is in the most narrowed state.

When the leader section ends, the tape detection circuit 32 generates a high potential output, and the output of the NAND gate 34 becomes a low potential. At this time, fade switch 11
When is turned on, Nand Gate 3
4, the fade-in switch 10 is turned on, and the pulse generator 7 generates a unit pulse. This unit pulse is integrated in the integrating circuit 8 and converted into a sawtooth wave, and the input/output attenuation ratio of the electronic volume 9 is sequentially decreased, and the recording input signal is supplied from the input terminal to a noise reduction circuit such as a Dolby circuit. It's faded in.

Also, the output of the NAND gate 34 is connected to the inverter 35.
The flip-flop 33 is reset by the generation of the low potential output of the NAND gate 34, that is, by the fade-in instruction.

In the above-described embodiment of the present invention, the fade-in of the recording input during timer recording has been explained, but it is also possible to similarly fade in the playback sound and the playback output during timer playback.

[Effect of idea]

As explained above, according to the present invention, since the recording input during timer recording is faded in, the generation of unpleasant sounds due to a large input at the start of recording can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention, and FIGS. 2a and 2b are block diagrams showing the structure of a conventional example. 1...Power supply circuit, 2...Timer output generation section,
3...Operation key switch input section, 5...Setting switch, 7...Pulse generation section, 8...Integrator circuit, 9
...Electronic volume, 32...Tape detection circuit,
33...Flip-flop.

Claims (1)

[Scope of utility model registration request] In a cassette tape recorder, a pulse generating means generates a pulse output when the power is turned on, a magnetic tape detecting means detects a recordable portion of the magnetic tape, and a generated output from the pulse generating means and a generated output from the magnetic tape detecting means are used. A cassette tape recorder comprising a fade-in means that operates.