JPH0746410B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing an audio signal on a magnetic tape.

2. Description of the Related Art In recent years, a magnetic recording / reproducing apparatus has attracted attention because it can easily record and reproduce video and audio, and a magnetic recording / reproducing apparatus capable of switching the tape speed according to recording information or the like in three stages has been put into practical use.

An example of a conventional magnetic recording / reproducing apparatus capable of switching the tape speed to three levels of v, 2v, and 3v will be described below with reference to the drawings.

3 and 4 are a block diagram of a conventional magnetic recording / reproducing apparatus and a recording / reproducing equalizer characteristic. Third
In the figure, 1 and 1a are mode changeover switches which are switched according to the selected tape speed. Reference numeral 2 is a recording equalizer circuit in a first mode with a tape speed of 3v, 21 is a second mode with a tape speed of 2v, and 3 is a recording equalizer circuit in a third mode of a tape speed v. 4, 4a is a recording amplifier and a reproducing amplifier, 5 is a recording head, 6 is a magnetic tape, 7 is a reproducing head (generally, the recording head 5 is also used), 8 is a reproduction equalizer circuit of the first mode, and 22 is 2nd, 9th is 3rd
It is a mode reproduction equalizer circuit.

In FIG. 4, 11 is the first-mode recording equalizer circuit 2, 23 is the second-mode recording equalizer circuit 21, 12 is the third
The respective recording equalizer characteristics of the mode recording equalizer circuit 3 are shown.

13 is a reproduction equalizer circuit 8 in the first mode, 24 is a reproduction equalizer circuit 22 in the second mode, and 14 is a reproduction equalizer characteristic of the reproduction equalizer circuit 9 in the third mode.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described below.

First, when recording and reproducing an audio signal so that various characteristics such as frequency characteristics are the best, although the recording time per tape is short (first mode), the mode selector switch 1 shown in FIG. 3 is set to the first mode. The recording equalizer circuit 2 is connected to the recording tape to record on the magnetic tape 6 with the recording equalizer characteristic 11 in the curve of FIG. During playback, the mode selector switch in Fig. 3
1a is connected to the reproduction equalizer circuit 8 in the first mode,
Reproduction is performed with the reproduction equalizer characteristic of 13 in the curve of FIG.
Although various characteristics of the audio signal are slightly deteriorated as compared with those in the first mode, when it is desired to record / reproduce for a long time (third mode), the mode selector switch 1 shown in FIG. It is connected to the circuit 3 and recorded on the magnetic tape 6 with the recording equalizer characteristic of 12 in the curve of FIG. 4a. At the time of reproduction, the mode changeover switch 1a shown in FIG. 3 is connected to the reproduction equalizer circuit 9 in the third mode, and reproduction is performed with the reproduction equalizer characteristic 14 in the curve shown in FIG. 4b. Further, when the recording / reproducing time is relatively long and the characteristics of the audio signal may be in the middle between the first and third modes (second mode), the mode selector switch 1 shown in FIG. 3 is set to the second mode. It is connected to the recording equalizer circuit 21, and recording is performed with the recording equalizer characteristic of 23 in the curve of FIG. 4a. At the time of reproduction, the mode changeover switch 1a of FIG. 3 is connected to the reproduction equalizer circuit 22 of the second mode, and reproduction is performed with the reproduction equalizer characteristic of the curve 24 in the curve of FIG. 4b.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned configuration, since equalizer circuits for recording and reproducing are required for each of the first, second and third modes, the circuit is complicated and expensive. It had a problem that

In view of the above problems, the present invention provides a magnetic recording / reproducing apparatus having a simple circuit and inexpensive, and having a performance that is not much different from the conventional one.

Means for Solving the Problems In order to solve the above problems, the magnetic recording / reproducing apparatus of the present invention uses the first mode recording equalizer circuit and the first reproduction when recording / reproducing an audio signal at the tape speed of the first mode. A reproduction signal is obtained via the equalizer circuit, and at the time of recording / reproduction at the tape speed in the third mode, a reproduction signal is obtained via the third recording equalizer circuit and the third reproduction equalizer circuit to record / reproduce at the tape speed in the second mode. Sometimes
A configuration is provided in which a reproduction signal is obtained via the recording equalizer circuit of the third mode and the first reproduction equalizer circuit.

The present invention has the above-described configuration, and by selectively combining two equalizer circuits in the recording system and two equalizer circuits in the reproducing system, good recording / reproducing characteristics for three recording / reproducing modes, respectively. Therefore, the number of equalizer circuits is reduced as compared with the conventional configuration.

Embodiment A magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a magnetic recording / reproducing apparatus in an embodiment of the present invention, and FIG. 2 shows characteristics of a recording / reproducing equalizer. In FIGS. 1 and 2, the same structural blocks and characteristic curves as those of the conventional one shown in FIGS. 3 and 4 are designated by the same reference numerals.

The difference between FIG. 1 and FIG. 3 is that in FIG. 1, the recording equalizer circuit 21 and the reproduction equalizer circuit 22 of the second mode shown in FIG. 3 are removed and the second mode and the third mode are shared. The third recording equalizer circuit 3 is used,
The point is that the first reproduction equalizer circuit 8 is used commonly in the first mode and the second mode.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

Although the recording time per tape is short, when recording / reproducing an audio signal so that the various characteristics such as frequency characteristics are the best (first mode), the mode selector switches 1, 1a shown in FIG.
Is connected to the recording equalizer circuit 2 and the reproducing equalizer circuit 8 in the first mode, and recording / reproducing is performed by the recording equalizer characteristic 11 in the curve of FIG. 2a and the reproducing equalizer characteristic 13 in the curve of FIG. 2b.

When performing recording / reproduction for a long time (third mode), the mode changeover switches 1 and 1a of FIG. 1 are connected to the recording equalizer circuit of the third mode and the reproduction equalizer circuit 9 of the third mode, respectively. Recording / reproduction is performed with 12 recording equalizer characteristics in the curve of FIG. 2A and 14 reproduction equalizer characteristics in the curve of b.

When recording / reproducing for a relatively long time and proper audio signal characteristics (second mode), the mode changeover switches 1 and 1a shown in FIG. 1 are used to record the recording equalizer circuit 3 in the third mode. Then, by connecting to the reproduction equalizer circuit 8 in the first mode, recording with the recording equalizer characteristic of the curve 12, and reproducing by the reproduction equalizer characteristic of the curve 13, almost the same characteristic as the conventional one can be obtained.

By the way, when recording and reproducing in the second mode with the recording equalizer characteristic of the curve 11 in FIG. 2 and reproducing with the reproducing equalizer characteristic of the curve 13, the high-frequency compensation amount at the time of recording is insufficient and the high level at the time of reproduction is high. The frequency characteristics are too low.

Also, when this is reproduced by the reproduction equalizer characteristic of the curve 14, similarly, the high frequency characteristic is lowered too much, and further, the S / N ratio is deteriorated by the excessive reproduction high frequency compensation amount, and the curve 12 is also generated. When recording with the recording equalizer characteristic of and reproducing with the reproduction equalizer characteristic of the curve 14, the high frequency compensating amount is too large at the time of reproduction, and the frequency characteristic of the high frequency is raised too much. In comparison, good characteristics cannot be obtained.

As described above, according to this embodiment, in recording / reproducing in the second mode, the recording equalizer in the third mode is used for recording, and the reproducing equalizer in the first mode is used for reproducing, which is conventionally required. Also, the recording and reproducing equalizer circuit dedicated to the second mode is not required, the equalizer circuit can be reduced, and the recording and reproducing characteristics that are not significantly deteriorated as compared with the conventional configuration can be obtained.

As described above, according to the present invention, at the time of recording / reproducing an audio signal at the tape speed of the first mode, a reproduction signal is obtained through the recording equalizer circuit of the first mode and the first reproduction equalizer circuit to obtain the reproduction signal of the third mode. When recording / reproducing, a reproduction signal is obtained through the third recording equalizer circuit and the third reproducing equalizer circuit, and when recording / reproducing in the second mode, reproducing through the recording equalizer circuit in the third mode and the reproducing equalizer circuit in the first mode. By obtaining the signal, it is possible to reduce the recording and reproducing equalizer circuit dedicated to the second mode, which is conventionally required.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIGS. 2A and 2B are characteristic diagrams of a recording / reproducing equalizer circuit of FIG. 1, and FIG. 3 is a block of a conventional magnetic recording / reproducing apparatus. FIGS. 4A and 4B are characteristic diagrams of the recording / reproducing equalizer circuit of FIG. 1, 1a: Mode selector switch, 2 ... First mode recording equalizer circuit, 3 ... Third mode recording equalizer circuit,
4,4a ... Amplifier, 5 ... Recording head, 6 ... Magnetic tape, 7 ... Playback head, 8 ... First mode playback equalizer circuit, 9 ... Third mode playback equalizer circuit.

Claims (1)

[Claims] 1. A tape speed during recording / reproducing is gradually decreased.
It is possible to selectively switch to tape speed in the 1st, 2nd and 3rd modes,
When recording / reproducing an audio signal at the tape speed in the first mode, a reproduction signal is obtained through a first recording equalizer circuit having a first recording equalizer characteristic and a first reproducing equalizer circuit having a first reproducing equalizer characteristic. During recording / reproduction of an audio signal at the tape speed of the third mode, a reproduction signal is reproduced via a third recording equalizer circuit having a third recording equalizer characteristic and a third reproducing equalizer circuit having a third reproducing equalizer characteristic. When the audio signal is recorded / reproduced at the tape speed in the second mode, the reproduction signal is obtained via the third recording equalizer circuit and the first reproduction equalizer circuit having the first reproduction equalizer characteristic. A magnetic recording / reproducing apparatus characterized by the above.