JPH0439138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a plurality of mechanism parts, and a signal reproduced by a reproduction head placed on a first mechanism part is transferred to a second mechanism part. The present invention relates to a tape recorder that enables so-called dubbing recording, in which recording is performed using a recording head.

BACKGROUND TECHNOLOGY In recent years, tape recorders of this type have been equipped with a tape type detection means that detects a notch hole provided at a predetermined position in the half according to the type of tape, and has been equipped with a tape type detection means that detects a notch hole provided at a predetermined position in the half according to the type of tape. Many tape recorders now have a so-called autotape selector function that allows values and recording equalizer characteristics to be set.

An example of the conventional tape recorder mentioned above will be described below with reference to the drawings.

FIG. 2 is a block diagram of the main parts of a conventional tape recorder. In FIG. 2, 1 and 2 are the first and second mechanism parts, 3 is the playback head placed on the first mechanism part 1, and 4 is the first playback head placed on the first mechanism part 1. Tape type detection means; 5 is a recording/playback head placed on the second mechanism section 2; 6 is a second tape type detection means placed on the second mechanism section 2; 7 and 8 are the first and second tape type detection means; A compact cassette 9 having a cutout hole A for detecting the tape type, which is attached to the mechanism section 1 and the second mechanism section 2, detects when the first mechanism section 1 is in the playback operation state. Regenerative amplifier that receives a reproduced signal as input, 1
0 is the first one provided in the negative feedback path of the regenerative amplifier 9.
An equalizer element 11 is connected to the output transmission path of the regenerative amplifier 9 and a second equalizer element 12 selectively shunts high frequency components by opening and closing operations of a first switching means 15, which will be described later. When the recording/reproducing switch 17 is in the reproducing state, the second reproducing amplifier inputs the reproducing signal from the recording/reproducing head 5; Equalizer element 14 is a fourth equalizer element that is connected to the output transmission line of regenerative amplifier 12 and selectively shunts the high frequency component by opening and closing operation of second switching means 16, which will be described later.
Reference numerals 15 and 16 indicate first and second switching means that perform opening and closing operations in response to commands from a first command end 18a and a second command end 18b of a control means 18, which will be described later; When performing the recording operation, the switch is made to the recording side, and the output signal from the recording amplifier 27, which will be described later,
A recording signal superimposed on a bias current from a bias oscillator 28, which will be described later, is supplied to the recording/playback head 5, and when the second mechanism section 2 is in the playback operation state, it switches to the playback side and operates the recording/playback head. A recording/reproducing switch 18 inputs the playback signal from 5 to the second playback amplifier 12; 18 indicates the first tape type detection means 4 and the second tape type detection means 6;
Control means 19 and 20 output predetermined logic commands to the first command terminal 18a and the second command terminal 18b in response to the opening/closing operation of the first regenerative amplifier 9 and the second regenerative amplifier 12. 21 is a mixing amplifier that amplifies the signal mixed by the mixing resistors 19 and 20. 22 receives the output signal of the mixing amplifier 21 as an input, and the level at the output terminal 23, which will be described later, is A voltage amplifier that amplifies the voltage to a predetermined value; 23 is an output terminal connected to the output end of the voltage amplifier 22; 24 is an input terminal to which a recording source signal is connected; 25 is an input terminal that adjusts the input level from the input terminal 24; An input level adjustment means 26 adjusts the level to a level suitable for recording, which inputs the output signal from the input level adjustment means 25 to a recording amplifier 27 (to be described later) when performing normal recording operations, and mixes when performing dubbing operations. a dubbing operation changeover switch 2 configured to input the output signal of the amplifier 21 to a recording amplifier 27 to be described later;
7 is a recording amplifier 28 whose input is the signal inputted through the dubbing operation changeover switch 26 and whose output is connected to the recording side of the recording/reproduction changeover switch 17;
is a bias oscillator whose output is connected to the recording side of the recording/reproducing switch 17 so as to supply a bias current to the recording/reproducing head 5 when the second mechanism section 2 is in the recording operation state.

The operation of the tape recorder configured as described above will be explained below.

First, the recording compact cassette 8 is attached to the second mechanism section 2, and only the mechanism section 2 is used for recording operation, and a source signal source from a tuner or the like is connected to the input terminal 24 to record it. To explain the normal recording operation, the source signal input to the input terminal 24 is adjusted to a level suitable for recording by the input level adjustment means 25, and then the source signal input to the input terminal 24 is adjusted to a level suitable for recording.
a to the recording amplifier 27 via the common terminal 26c.
The amplified output signal is superimposed on the bias current from the bias oscillator 28, and is applied from the recording side terminal 17a of the recording selector switch 17 to the recording/playback head 5, which operates as a recording head, via the common terminal 17c. compact cassette 8
will be recorded.

Next, a recorded compact cassette 7 such as a music tape is attached to the first mechanism section 1, and the first mechanism section 1 is put into a playback operation state.
To explain the dubbing operation in which the recording compact cassette 8 is attached to the second mechanism section 2 and the second mechanism section 2 is in the recording operation state, the playback head 3 placed on the first mechanism section 1 is activated. The regenerated signal is sent to the first regenerative amplifier 9.
The output signal is inputted to the mixing amplifier 21 via the mixing resistor 19, and the output signal is inputted from the terminal 26b of the dubbing operation switch 26 to the recording amplifier 27 via the common terminal 26c, similar to the above-mentioned normal recording operation. second
Dubbing recording is performed on a final recording compact cassette 8 attached to the mechanism section 2 of the cassette.

Next, the recorded compact cassette 7 is attached to the first mechanism section 1, and the first mechanism section 1
To explain the reproducing operation with only the reproducing operation state, the output transmission line of the mixing amplifier 21 is
The process up to the point where the amplified reproduction signal is output is the same as in the dubbing operation described above, and the output signal from the mixing amplifier 21 is input to the voltage amplifier 22, and after being voltage amplified to a predetermined output level,
By applying the signal to the output terminal 23, the recorded compact cassette 7 mounted on the first mechanism section 1 is played back. Furthermore, we will explain the playback operation in which the recorded compact cassette 8 is attached to the second mechanism section 2, only the second mechanism section 2 is in the playback operation state, and the recording/playback head 5 is operated as the playback head. The playback signal played back by the recording/playback head 5 operating as
The amplified output is input to the second regenerative amplifier 12 via the mixing resistor 20 and amplified, and then the output is input to the voltage amplifier 22 to achieve a predetermined output level. After the voltage is amplified so that
3, the recorded compact cassette 8 mounted on the second mechanism section 2 is played back.

Next, the first mechanism part 1 and/or the second
The compact cassette 7 and/or the compact cassette 8 mounted on the mechanism section 2 of the tape type detector 4 and the first tape type detection means 4 and/or the second
The relationship between the tape type detection means 6 and playback frequency compensation (equalizing) will be explained.

Conventionally, there are four types of tapes that are commonly called: Type = Normal, Type =
It is called chrome, type = ferrichrome, type = metal.

In addition, playback frequency compensation characteristics are generally standardized in the form of specifying the frequency characteristics of playback amplifiers, including Japan's JIS standards, DIN standards, etc. for compact cassettes (tape speed 4.8
cm/S), the midrange is a straight line of 6dB/octave, with two bends in the low and high ranges. (The frequency at the bending point is called the turn-over frequency.) If the low-range and high-range turnover frequencies are ₁ and ₂ , the above-mentioned characteristics can be found as a function of frequency, and the time constant at ₁ and ₂ above can be found as a function of frequency. They are generally expressed as T ₁ (μsec) and T ₂ (μsec), respectively.

Therefore, the above-mentioned four tape types and playback frequency compensation characteristic standards (T ₁ (μsec), T ₂ (μsec))
The general relationships are as follows: Type...T ₁ = 3180μsec, T ₂ = 120μsec Type Type Type...T ₁ = 3180μsec, T ₂ = 70μsec.

Therefore, during playback, it is necessary to change the high frequency time constant (T ₂ (μsec)) depending on the type of tape.
In recent years, a system has been introduced in which a predetermined cutout hole is provided in each half of a compact cassette for each tape type, and this is automatically detected to enable switching.

The relationship explained above will be further explained using FIG. 2.

First, assuming that the compact cassette 7 attached to the first mechanism section 1 is of the type (normal) and does not have a cutout hole A in the half, the contact of the tape type detection means 4 is closed, and the control means A negative logic command is output from the first command terminal of the first regenerative amplifier 9, the first switching means 15 is opened, the second equalizer element 12 does not function, and the high frequency component of the output signal of the first regenerative amplifier 9 is is not shunted. In this state, the first equalizer element provided in the negative feedback path of the first regenerative amplifier 9 controls the low frequency (T ₁ =
3180 μsec), and has a frequency characteristic with a bending point in the high range (T ₂ = 120 μsec).

Next, when the compact cassette 7 attached to the first mechanism part 1 is a tape type other than the type and it is necessary to select T ₂ = 70 μsec, assuming that there is a notch hole A in the half, the tape type detection The contacts of the means 4 are opened and a positive logic command is output from the first command end 18a of the control means 18, and the first
The switching means 15 is closed, and the second equalizer element 12 functions to shunt the high frequency component of the output signal of the first regenerative amplifier 9, so that the frequency characteristic is T ₂ =70 μsec. There is.

Note that the second tape type detection means 6 provided in the second mechanism section 2 and the second tape type detection means 6 of the control means 18
command end 18b and second switching means 16
The operation and relationship between the third equalizer element 13 and the fourth equalizer element 14 are also the same as in the first mechanism described above.

Problems to be Solved by the Invention However, in the above configuration, the first mechanism section is in the reproducing operation state, and the first regenerative amplifier to which the reproducing signal is input from the reproducing head and the second
Since a second reproducing amplifier is provided to input the reproduction signal when the recording/reproducing head is operated as a reproduction head, the number of parts increases and the cost also increases. Therefore, the regenerative amplifier can be integrated by providing a switch means that is switched in response to commands from the control means that issue commands with different logic depending on whether the first or second mechanism is in the regenerative operation state. When configured with two
Additionally, there is a problem in that it is necessary to determine whether the tape type detection means placed on either of the second mechanism sections should function, and to detect the tape type.

In view of the above-mentioned problems, the present invention is designed so that even if there is only one reproducing amplifier, the tape type detection means on the side to be reproduced is always selected with priority,
To provide a tape recorder capable of performing appropriate playback frequency compensation even when compact cassettes of different tape types are simultaneously loaded in first and second mechanism parts.

Means for Solving the Problems In order to solve the above problems, the tape recorder of the present invention has a first tape recorder mounted on a first mechanism section.
a head and a first tape type detection means, a second head and a second tape type detection means mounted on the second mechanism section, and a second head and a second tape type detection means mounted on the second mechanism section; a regenerative amplifier which inputs the signal switched by the switch means; when the first mechanism section is in the reproducing operation state, and when the second mechanism section is in the reproducing operation state. control means for issuing commands with different logic depending on the state; and selection means for selecting either the first or second tape type detection means in response to the logic command from the control means. It is prepared.

Effects According to the present invention, when a logic command is issued from the control means so that the reproduction signal from the first head is input to the reproduction amplifier, that is, the first mechanism section is in the reproduction operation state. , the first tape type detection means is selected and a different logical command from the above is issued from the control means so that the reproduction signal from the second head is input to the reproduction amplifier, i.e. When the second mechanism is in the reproducing operation state, the second tape type detection means is selected.

Embodiment A tape recorder according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the main parts of a tape recorder according to an embodiment of the present invention. In FIG. 1, 1 and 2 are the first and second mechanism parts, 3 is a reproduction head (first head) placed on the first mechanism part 1, and 4 is a reproduction head placed on the first mechanism part 1. 5 is a recording/playback head (second head) placed on the second mechanism section 2; 6 is a second tape type detection means placed on the second mechanism section 2; Tape type detection means, 7 and 8
28 is a compact cassette having a cutout hole A for tape type detection, which is attached to the first mechanism section 1 and the second mechanism section 2; Switch means 29 inputs the reproduction signal from the recording/reproducing head 5 to the reproduction amplifier 29 (described later) via the reproduction head 2 or the recording/reproduction switching switch 17 (described later) in response to a predetermined logical command from the control means 33. A regenerative amplifier which inputs the reproducing signal from the reproducing head 3 or the recording/reproducing head 5 selected by the switch means 28; 30 is a first equalizer element provided in the negative feedback path of the regenerative amplifier 29;
31 is a second equalizer element which is connected to the output transmission line of the regenerative amplifier 29 and selectively shunts the high frequency component by the opening/closing operation of switching means 32, which will be described later. A switching means 34 that performs an opening/closing operation in response to a logic command switches either the first tape type detection means 4 or the second tape type detection means 6 in response to a predetermined logic command from the control means 33. The selection means 17 switches to the recording side during dubbing operation or normal recording operation,
A recording signal superimposed with an output signal from a recording amplifier 27 (described later) and a bias current from a bias oscillator 28 (described later) is supplied to the recording/reproducing head 5,
When the second mechanism section 2 is in a reproducing operation state, a recording/reproducing switch switches to the reproducing side and inputs the reproducing signal from the recording/reproducing head 5 to the reproducing amplifier 29 via 28b of the switch means 28; 2
2 is a voltage amplifier that receives the output signal of the regenerative amplifier 29 and amplifies the voltage so that the level at an output terminal 23 (described later) becomes a predetermined value; 23 is an output terminal connected to the output terminal of the voltage amplifier 22; 24; 25 is an input level adjusting means for adjusting the input level from the input terminal 24 to a level suitable for recording; 26 is an input level adjusting means for adjusting the input level from the input terminal 24 to a level suitable for recording; 25
The output signal is input to a recording amplifier 27 (to be described later), and when dubbing is performed, the output signal is input to a reproducing amplifier 29.
A dubbing operation changeover switch 27 is switched to input the output signal from the recording amplifier 27 to a recording amplifier 27, which will be described later. The connected recording amplifier 28 supplies a bias current to the recording/reproducing head 5 when the second mechanism section 2 is in the recording operation state.
This is a bias oscillator whose output is connected to the recording side of the recording/reproducing switch 17 so as to supply the signal to the recording/reproducing switch 17.

The operation of the tape recorder configured as described above will be explained below.

First, the compact cassette 8 is attached to the second mechanism section 2, and only the mechanism section 2 is used for recording, and a source signal source from a tuner or the like is connected to the input terminal 24 to record it. To explain the recording operation, input terminal 2
The source signal input to 4 is adjusted to a level suitable for recording by the input level adjustment means 25, and then input to the recording amplifier 27 from the terminal 26a of the dubbing operation switch 26 to the common terminal 26c, where it is amplified. The output signal is sent to the bias oscillator 28
It is superimposed with the bias current from the recording side terminal 17a to the common terminal 17c of the recording/reproducing switch 17.
The data is added to the recording/reproducing head 5, which operates as a recording head, and recorded onto the compact cassette 8.

Next, a recorded compact cassette 7 such as a music tape is attached to the first mechanism section 1, and the first mechanism section 1 is put into a playback operation state.
To explain the dubbing operation in which the recording compact cassette 8 is attached to the second mechanism section 2 and the second mechanism section 2 is in the recording operation state, the playback head 3 placed on the first mechanism section 1 is activated. The reproduced signal is transmitted to the switch means 2 which is closed in response to a predetermined logical command from the control means 33.
The signal is inputted to the reproduction amplifier 29 through the 28a side of the 8, and after being amplified, is output and inputted from the terminal 26b of the dubbing operation changeover switch 26 to the recording amplifier 27 through the common terminal 26c.

Then, dubbing recording is performed on the final recording compact cassette 8 attached to the second mechanism section 2 in the same manner as in the normal recording operation described above.

Next, we will explain the playback operation in which the recorded compact cassette 7 is attached to the first mechanism section 1 and only the first mechanism section 1 is in the playback operation state. The process up to where the signal comes out is the same as in the dubbing operation described above, and the output signal from the regenerative amplifier 29 is input to the voltage amplifier 22, where the voltage is amplified to a predetermined output level, and then applied to the output terminal 23. As a result, the recorded compact cassette 7 attached to the first mechanism section 1 is played back.

Furthermore, we will explain the playback operation in which the recorded compact cassette 8 is attached to the second mechanism section 2, only the second mechanism section 2 is in the playback operation state, and the recording/playback head 5 is operated as the playback head. The reproduced signal reproduced by the recording/reproducing head 5 operating as a recording/reproducing head 5 is inputted from the common terminal 17c of the recording/reproducing switch 17 to the reproduction amplifier 29 via the reproduction side terminal 17b and 28b of the switch means 28, and is thereafter inputted to the reproduction amplifier 29 as described above. The reproducing operation of the recorded compact cassette 8 mounted on the second mechanism section 2 is performed in the same manner as when only the first mechanism section 1 is brought into the reproducing operation state.

Next, the selection operation of the first tape type detection means 4 and the second tape type detection means 6, and the selection operation of the first tape type detection means 4 and the second tape type detection means 6 are performed.
The switching operation of the equalizer element 30 and the second equalizer element 31 will be explained.

First, when a type (normal) compact cassette 7 is attached to the first mechanism section 1 and it is put into the playback operation state, a predetermined logic (positive logic) command is issued from the control means 33. Then, the 34a side of the selection means 34 is closed and the first tape type detection means 4 is selected.

At this time, assuming that there is no cutout hole A in the cassette half of the compact cassette 7 of the installed type (normal), the contact of the first tape type detection means 4 is closed, so the switching means 32 is closed. The second equalizer element 31 does not function and the high frequency component of the output signal of the regenerative amplifier 29 is not shunted.

In the above state, the first equalizer element provided in the negative feedback path of the regenerative amplifier 29 creates a frequency characteristic with bending points in the low range (T ₁ = 3180 μsec) and the high frequency range (T ₂ = 120 μsec). becomes.

Furthermore, in the above state, a compact cassette 7 other than the type (normal) is inserted into the first mechanism section 1.
If it is put into the playback mode with the tape installed, the steps up to the point where the first tape type detection means 4 is selected are the same as when the above-mentioned type of compact cassette 7 is installed. There is a notch hole A in the cassette half of the compact cassette 7 of the type other than the installed type, and the contact of the first tape type detection means 4 is open, so the switching means 32 is opened and the second tape type detection means 4 is opened.
The equalizer element 31 functions and the regenerative amplifier 2
The high frequency part of the output signal of 9 is shunted, T ₂ = 70μsec
The frequency characteristics are as follows.

Incidentally, when the second mechanism 2 is brought into the reproducing operation state with the compact cassette 8 of this type or another type attached to the second mechanism section 2, the control means 33 controls the first mechanism section 1. A different logic (negative logic) command than when in the reproducing operation state is issued, and 34b of the selection means 34
is selected, and the subsequent operation is performed by the first mechanism section 1.
In the same way as the operation explained in , T ₂ =
A switching operation of 120 μsec and T ₂ =70 μsec is performed.

As described above, according to this embodiment, the first head and the first tape type detection means placed on the first mechanism section, and the second head placed on the second mechanism section and a second tape type detecting means, a switch means for switching the reproduced signal from the first or second head, a reproducing amplifier inputting the signal switched by the switch means, and a reproducing amplifier receiving the signal switched by the switch means; a control means for issuing different logic commands when the first mechanism section is in a regeneration operation state and when the second mechanism section is in a regeneration operation state; and a control means for responding to the logic command from the control means. selecting means for selecting either the first or second tape type detecting means, switch means for switching the reproduction signal from the first or second head; By configuring the selection means for selecting one of the type detection means to be controlled by the same logical command, when the first mechanism section is in the playback operation state, the first tape type detection means When selected and the second mechanism is in a reproducing operation state, the second tape type detection means may be selected.

Effects of the Invention A first head and a first tape type detection means placed on the first mechanism section, and a second head and second tape type detection means placed on the second mechanism section. , a switch means for switching the reproduced signal from either the first or second head, a regenerative amplifier receiving the signal switched by the switch means, and the first mechanism section in a reproducing operation state. and when the second
a control means for issuing a different logic command depending on when the mechanism section of the tape is in a reproducing operation state; and a control means for issuing one of the first or second tape type detection means in response to the logic command from the control means. By providing a selection means for selecting the tape type, even if one reproduction amplifier is provided for the first and second heads, the tape type detection means on the side to be reproduced can always be selected preferentially. , it is possible to perform appropriate playback frequency compensation even when compact cassettes of different tape types are installed in the first and second mechanism sections at the same time, and the playback amplifier is integrated into one. It is possible to provide a tape recorder capable of simple dubbing operation at low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts of a tape recorder according to an embodiment of the present invention, and FIG. 2 is a block diagram of main parts of a conventional tape recorder. DESCRIPTION OF SYMBOLS 1...First mechanism section, 2...Second mechanism section, 3...Reproduction head, 4...First tape type detection means, 5...Recording/reproduction head, 6...
...Second tape type detection means, 7 and 8...
Compact cassette, 17... Recording/playback switch, 22... Voltage amplifier, 23... Output terminal, 2
4...Input terminal, 25...Input level adjustment means,
26...Dubbing operation selection switch, 27...
Recording amplifier, 28...Switch means, 29...Reproduction amplifier, 30...First equalizer element, 31
... second equalizer element, 32 ... switching means, 33 ... control means, 34 ... selection means.

Claims (1)

[Scope of Claims] 1. A first head and a first tape type detection means placed on the first mechanism section, and a second head and a second tape type detection means placed on the second mechanism section. tape type detection means; switch means for switching between the first and second heads; a reproduction amplifier inputting the signal switched by the switch; and the first mechanism section. control means for issuing commands with different logic when the second mechanism section is in a regeneration operation state and when the second mechanism section is in a regeneration operation state; or a selection means for selecting either the second tape type detection means. 2. The switch means for switching the reproduction signal from the first or second head and the selection means for selecting either the first or second tape type detection means are controlled by commands of the same logic. A tape recorder according to claim 1.