JPH0424529Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a muting device for a tape recorder deck.

[Conventional technology]

Conventionally, the peach shown in FIG. 1 has been known as this type of device. In the figure, numeral 1 is an equalizer;
2 is an input selector/flat amplifier, 3 is an electronic volume, 4 is a tone control, 5 is an isolator, 6 is a muting circuit, 7 is a head,
8 is a reel stand; 9 is a tape transport and head support mechanism including the head 7, reel stand 8, etc.;
10 is a microprocessor, 11 is a keyboard,
Reference numeral 12 denotes a drive circuit that transmits drive commands to the tape transport and head support mechanism (hereinafter referred to as drive mechanism) 9. The operation based on the following configuration will be explained. To only discuss the muting motion in the figure,
Until a command to "play" is issued from the keyboard 11, the muting circuit 6 mutes the tape. For example, in a tape recorder deck equipped with a music search function, the head 7 normally mutes the tape slightly even during fast forwarding or rewinding. Since the equalizer 1, input selector/flat amplifier 2, electronic volume 3, tone control 4, and isolator 5 are in operation, the following muting operation is performed. Mute is applied during operations other than playback or recording monitoring. Mute is applied at the same time as the playback or recording monitor transitions to other operations. Switch to playback or recording monitor, and after the system stabilizes, the mute is removed. The above three operations may take time in the microprocessor 10, or the muting circuit 6 may have a time constant. Since the conventional device is configured as described above, a muting circuit is required to prevent noise other than when recording and monitoring, such as pop noise and queuing sound, and this muting circuit has a large attenuation ability and a time constant. had the disadvantage of requiring a complex circuit to be constructed.

[Purpose of invention]

This idea was made to eliminate the drawbacks of the conventional ones as described above, and by changing the microprocessor program, it is possible to perform mutating accurately without providing a muting circuit like the conventional one. It is an object of the present invention to provide a muting device for a tape recorder deck capable of performing operations.

[Structure of the idea]

For the above purpose, the present invention provides a tape recorder deck comprising a microprocessor, a tape transport mechanism, a head support mechanism and an electronic volume controlled by the microprocessor. command, during at least one operation including a stopped state except for playback and recording monitoring, or when switching the operation of the tape recorder deck, the switching of the tape transport mechanism, etc. starts, or the switching of the operation ends immediately before the start of this switching. At a predetermined time until later, the set value of the electronic volume is significantly lowered while the set value of the electronic volume immediately before the start of the first operation or just before the start of the switching is stored in the microprocessor;
After the above-mentioned one operation is completed or after the above-mentioned predetermined time has elapsed, the set value of the above-mentioned electronic volume is returned to the set value immediately before being significantly lowered.

【Example】

Hereinafter, an embodiment of this invention will be described based on the drawings. FIG. 2 shows a conventional configuration in which the muting circuit 6 in FIG. 1 is removed. The operation will be explained based on the above configuration. First, immediately after turning on the deck power, microprocessor 1
0, the value of the electronic volume 3 becomes significantly low, and the deck comes to a halt. The setting value of the electronic volume 3 stored in the microprocessor 10 is as follows.
It is set to a very small value, except when the value was set before the tape recorder deck was activated. Therefore,
The set value of the electronic volume 3 is an extremely small value until the microprocessor 10 receives a reproduction or recording monitor command. Next, when the microprocessor 10 receives a command for playback or recording monitoring operation from the keyboard 11, the microprocessor 10 first puts the drive circuit 12, tape transport, head support mechanism 9, etc. into an operating state. As soon as this transition operation reaches a steady state, the microprocessor 10 returns the value of the electronic volume 3 to the set value stored before the tape recorder deck was operated. The purpose of the muting operation performed in this invention is to reduce pop noise, so after the tape transport, head support mechanism 9, etc. shift to the playback or recording monitor operation state, until the value of the electronic volume 3 is restored. It doesn't take a long time. Further, when the tape recorder deck receives a command to shift to playback or recording monitoring operation, the microprocessor 10 stores the current setting value of the electronic volume 3 and changes the electronic volume 3.
is lowered to the minimum value, and a signal corresponding to the command for playback, recording, etc. received by the drive circuit 12 is transmitted to the drive circuit 12, and the operations of the tape transport and head support mechanism 9 are shifted. That is, unless the command received by the microprocessor 10 is for playback or recording monitoring, the value of the electronic volume 3 remains reduced to the minimum value, but when the command for playing or recording monitoring is received, the drive circuit 12, The tape transport and head support mechanism 9 transition to operation according to the above commands, and when each system reaches a steady state after this transition, the value of the electronic volume 3 changes to the above value stored in the microprocessor 10. It is starting to return to . In addition, although this invention has been explained in the case of a tape recorder deck for both recording and playback, it may also be used for playback only.Furthermore, even if an amplifier is provided after the electronic volume 3, when switching the operation of the tape recorder deck, If the amplifier does not generate noise, the same effects as in the embodiment can be achieved.

[Effect of the idea]

As described above, according to this invention, the operation of the conventional muting circuit is made to be performed by the electronic volume commanded by the microprocessor, so the muting circuit is not necessary, and the amount of attenuation during muting is reduced. Guaranteed by the characteristics of the electronic volume. In addition, the switching of the operation of the tape transport mechanism, which is a source of pop noise, and the control of the electronic volume are easily controlled by microprocessor programming, making it possible to easily create a system in which mute-on precedes the pop noise. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a conventional tape recorder deck, and FIG. 2 is a block diagram showing an embodiment of this invention. 3...Electronic volume, 7...Head, 8...
Reel stand, 9... Tape transport and head support mechanism, 10... Microprocessor, 1
1...Keyboard, 12...Drive circuit.

Claims (1)

[Claims for Utility Model Registration] A tape recorder deck comprising a microprocessor, a tape transport mechanism, a head support mechanism, and an electronic volume controlled by the microprocessor, , during at least one operation including a stop state excluding the time of playback and recording monitoring, or the start of switching of the tape transport mechanism etc. when switching the operation of the tape recorder deck, or from immediately before the start of this switching until after the switching of the operation is completed. At a predetermined time, the set value of the electronic volume is significantly lowered while the set value of the electronic volume immediately before the start of the first operation or immediately before the start of the switching is stored in the microprocessor, and after the end of the first operation, the set value of the electronic volume is significantly lowered. Alternatively, the muting device for a tape recorder deck is characterized in that, after the elapse of the predetermined time, the set value of the electronic volume is returned to the set value immediately before being significantly lowered.