JPH0364935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder equipped with two playback mechanisms that can be driven simultaneously. The cue detecting section allows each of the two playback mechanism sections to cue the tape.

Conventionally, in a tape recorder equipped with one playback mechanism, that is, a single-mechanical tape recorder, in order to locate the beginning of the tape, as shown in FIG. The switch Sbx is closed at the same time, and the power signal of the first power terminal (+Ba) via the series circuit of both switches Sax and Sbx, that is, the command signal for the song selection mode command, is output to the cue detection section 2, and the cue detection unit 2 is detected. When section 2 is controlled to the song selection state, both switches
Due to the operation of Sax and Sbx, when both switches Sax and Sbx are closed as shown in FIG.
The music selection state signal is output, the music selection state signal is input to the base of the NPN transistor Tr via the input resistor Rx, the transistor Tr is turned on, and the current at the second power supply terminal (+Bb) is transferred to the playback mechanism section (Fig. Plunger Px (not shown) to control music selection mode
The playback mechanism section is controlled to the song selection mode as shown in FIG. Note that a bias resistor Ry is provided between the base and emitter of the transistor Tr.

Then, the audio signal played from the tape (not shown) by the operation of the playback mechanism is transmitted to the signal input terminal.
INx is input to the cue detection unit 2 via the input circuit 3x, and as shown in FIG. When the non-track part is played, at tc when the playback of the track part changes to the playback of the non-track part,
The song selection state of the cue detector 2 is released, and the song selection state signal is momentarily cut off as shown in FIG. output, transistor Tr
is turned off, the reproducing mechanism section is switched to the reproducing mode, and the beginning of the tape is searched, as shown in FIG.

On the other hand, in a tape recorder equipped with two playback mechanisms, that is, a double-mechanical tape recorder, in order to cue the beginning of the tape by the operation of both playback mechanisms, the above-mentioned cue detection section 2 is used for each of both playback sections. It is also necessary to separately provide a reproduction circuit section, which makes the circuit complicated and expensive.

Therefore, in order to simplify the circuit, one cue detector 2 could be used to cue the tape only for one of the playback mechanisms, or a manual changeover switch could be used to detect the cue. A tape recorder has been devised in which the section 2 is used to locate the beginning of the tape in each of the playback mechanism sections, but it has the disadvantage that it is very inconvenient to use.

This invention has been made with the above points in mind, and will now be described in detail with reference to FIG. 3 showing one embodiment thereof.

As shown in FIG. 3, the operating section 1b includes a series circuit of a playback switch Saa and a fast forward/rewind switch Sba of one playback mechanism (not shown), and a playback circuit of the other playback mechanism (not shown). A series circuit of a switch Sab and a fast forward/rewind switch Sbb is provided, and when switches Saa and Sba are simultaneously closed in order to command the music selection mode of one of the playback mechanisms, the first command output terminal Oa is connected to the first power supply terminal. (+Ba) power signal, that is, one command signal of "1" is output, and conversely, in order to command the music selection mode of the other playback mechanism, switches Sab, Sbb
When they are closed simultaneously, the other command signal of "1" is output from the second command output terminal Ob.

Then, both command signals are connected to the first and second diodes.
It is input to the cue detection section 2 via Da and Db, and the cue detection section 2 is controlled to the song selection state.
The music selection state signal of “1” is the first and second one of the logic circuit 4.
It is input to one input terminal of each of NAND gates Ga and Gb.

By the way, one command signal is input to one input terminal of the gate Ga via the first resistor Ra, and the other command signal is input to the other input terminal of the gate Gb via the second resistor Rb. For example, one command signal may be sent to the operating unit before the other command signal.
When the music selection state signal and one of the command signals are input to the gate Ga, and when the gate signal of "0" is output from the gate Ga to one input terminal of the first NOR gate Gc, the gate A gate signal of "1" is output from Gd to one input terminal of the second NOR gate Gd, and at this time, both gates Gc,
Since a flip-flop is formed by Gd, the output of gate Gc becomes "1" and the output of gate Gc becomes "0", and the outputs of both gates Gc and Gd are held, and the command signal of the other gate is Even when the output is output to gate Gd, the output of gate Gc is held at “1” and the output of gate Gd is held at “0”.
is maintained. Conversely, if the other command signal is output before the other command signal, the output of gate Gc becomes "0" and the output of gate Gd becomes "1".
As before, the outputs of both gates Gc and Gd are held. Note that a third resistor Rc is provided between the other input terminal of the gate Ga and the ground point, and a fourth resistor Rd is provided between the other input terminal of the gate Gd and the ground point.

Then, when an output of "1" from the gate Gc, that is, one priority control signal, is output from one control output terminal Oc of the logic circuit 4, one priority control signal is transmitted through the fifth resistor Re of the plunger section 5. teNPN
input to the base of the first transistor Qa of type
The transistor Qa is turned on, and the first plunger Pa, which controls one of the playback mechanisms to the music selection mode, is connected to the second plunger.
A current flows through the power supply terminal (+Bb), and one of the playback mechanisms is preferentially controlled to the song selection mode. Also,
One priority control signal is input to the base of the NPN type second transistor Qb via the sixth resistor Rf of the input switching section 6, and the transistor Qb is turned on.

Therefore, the playback output of the tape input to the first signal input terminal INa by the operation of one of the playback mechanism sections is input to the cue detection section 2 via the first input circuit 3a, and the tape playback output is inputted to the cue detection section 2 by the cue detection section 2. When a song interval is detected, the song selection status signal of cue detection section 2 is cut off, and a release signal of "0" is sent to both gates.
Input to one input terminal of Ga, Gb, gate Gc
output becomes "0", one priority control signal is briefly cut off, the transistor Qa is turned off, one of the reproducing mechanisms is switched from the song selection mode to the reproducing mode, and the beginning of the tape is found.

Note that one priority control signal causes the transistor to
Since Qb is on, the second input circuit 3b to which the tape playback output of the other playback mechanism is inputted via the second signal input terminal INb is briefly cut off, and the second
The output from the input circuit 3b to the cue detection section 2 is then cut off.

Conversely, when the output of "1" from the gate Gd, that is, the other priority control signal, is output from the other control output terminal Od of the logic circuit 4, the other priority control signal causes the seventh resistor Rg of the plunger section 5 to The current from the second power supply terminal (+Bb) flows through the second plunger Pb which controls the other reproduction mechanism section to the music selection mode, and the transistor Qc is turned on. The playback mechanism section is preferentially controlled to the song selection mode. In addition, the other priority control signal is connected to the eighth resistor of the input switching unit 6.
The signal is input to the base of the fourth NPN transistor Qd via Rh, and the transistor Qd is turned on.

Therefore, since transistor Qb is off,
The second signal input terminal is activated by the operation of the other playback mechanism.
The playback output of the tape input to INb is input to the cue detection section 2 via the second input circuit 3b, and when the cue detection section 2 detects a song interval on the tape, the cue detection section 2 The music selection status signal of ``0'' is suddenly cut off, and a release signal of ``0'' is sent to both gates, as described above.
Input to one input terminal of Ga, Gb, gate Gd
output becomes "0", the priority control signal of the other is cut off, the transistor Qc is turned off, the other reproducing mechanism is switched from the music selection mode to the reproducing mode, and the beginning of the tape is performed.

Note that Ri, Rj, Rk, and Rl are transistors Qa~
These are the 9th to 12th resistors for bias provided between the base and emitter of each Qd.

Therefore, according to the embodiment, the operation section 1b is activated by the operation of the logic circuit 4 to which the music selection state signal of the cue detection section 2 and both command signals are respectively input.
When one command signal is output first,
One priority control signal is output from the logic circuit 4,
Conversely, when the other command signal is output from the operation unit 1b first, the other priority control signal is output from the logic circuit 4, and the logic circuit 4 sets and maintains the priority order of both command signals. The plunger section 5 to which each of the priority control signals is input controls one of the playback mechanism sections to be in the song selection mode based on one of the priority control signals, and the other playback mechanism section is controlled to be in the song selection mode based on the other priority control signal. When the input switching unit 6 outputs one priority control signal,
When only the playback output from the tape of one playback mechanism section is input to the cue detection section 2 and the priority control signal of the other is output, only the playback output from the tape of the other playback mechanism section is input to the cue detection section 2. 2, the cueing detection of both playback mechanism sections can be automatically performed by one cueing detection section 2, and the cueing detection of both playback mechanism sections can be performed with a simple circuit configuration. At the same time, the usage performance can be significantly improved.

As described above, according to the tape recorder of the present invention, the cue detection of each of the two playback mechanism sections can be automatically performed by one cue detection section, and the usability of the tape recorder is significantly improved. This is something that can be provided.

[Brief explanation of drawings]

FIG. 1 is a block wiring diagram of a part of a tape recorder equipped with one playback mechanism, FIGS. 2 a to c are timing charts for explaining the operation of FIG. 1, and FIG. 3 is a tape recorder of the present invention. FIG. 2 is a block wiring diagram of one embodiment of the invention. 1b...operation unit, 2...cue detection unit, 4...
Logic circuit, 5...Plunger section, 6...Input switching section, INa, INb...Signal input terminal, Oa, Ob
...Command output terminal, Oc, Od...Control output terminal,
Pa, Pb...Plunger.

Claims (1)

[Claims] 1. In a tape recorder equipped with two playback mechanism sections that can be driven simultaneously, a command signal for instructing the song selection mode of each of the playback mechanism sections is output from each command output terminal provided for each of the playback mechanism sections. an operation section, and a cue detection section that is controlled to be in a song selection state by the two command signals, outputs a song selection state signal, and detects the interval between songs on the tape played by each of the playback mechanism sections to cancel the song selection state. , when the one command signal and the music selection state signal are input, one of the priority control signals is output from one control output terminal, and the one priority control signal is held, and the other command signal and the music selection state signal are input. a logic circuit that outputs the other priority control signal from the other control output terminal and holds the other priority control signal when the state signal is input; and a logic circuit that outputs the other priority control signal from the other control output terminal and holds the other priority control signal; a plunger section having one plunger that controls the other playback mechanism section to a music selection mode in accordance with the priority control signal of the other side; an input switching unit that inputs only the tape playback output by the unit into the cue detection unit and inputs only the tape playback output by the other playback mechanism unit to the cue detection unit according to the other priority control signal; A tape recorder characterized by: