JPS6224324Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tape recorder with an automatic tuning tuner, and more specifically to a device for preventing malfunction of an automatic tuning device using a recording bias frequency signal in a tape recorder.

In a tape recorder, a recording bias oscillator operates during recording to supply erasing current and bias current to the erasing head and recording head, respectively.In equipment that combines a tape recorder and a tuner, the recording bias oscillator and tuner are in the same housing, there is a possibility that the tuner will receive the bias oscillation frequency or its harmonics when the recording bias oscillator is operating. Normally, the bias oscillation frequency of the recording bias oscillator and its harmonics are selected so as not to overlap with the frequency of regular incoming radio waves, but in the AM band (or LW band) in particular, the bias oscillation frequency is relatively strong. If the second and third harmonics exist within that band, the tuner will be set to the receiving state even though there is no regular incoming radio wave, and especially in the interval where the frequency of the incoming radio wave exists in each band. In synthesizer-type tuners that select channels by varying the frequency division ratio of a programmable frequency divider step by step to obtain a reception frequency that is an integral multiple of If the bias oscillation frequency of the tape recorder or its harmonics is present in the receiving band, automatic tuning will be performed even if there is no regular incoming radio wave. This causes the signal to stop, greatly interfering with normal broadcast reception. In particular, there is a greater possibility of malfunctions in tapes that require strong erasing current and recording bias current, such as metal tapes that have been used recently.

The present invention has been made to eliminate the above-mentioned drawbacks, and will be described in detail below with reference to the drawings.

In the figure, 1 shows the control section of the tape recorder, and 2 is a recording bias oscillator that operates during recording and supplies recording bias current and erasing current to the recording/playback head (or recording head) RH and erasing head EH, respectively. , P is a pause button, and R is a recording button. 3 is a control logic system that controls a motor (not shown), a tape drive mechanism, an electric circuit, etc. according to the operation of a pause button P, a record button R, and other operation buttons (not shown), and 4 is an output from a synthesizer tuner section to be described later. This is a switch circuit that turns on and off the recording bias oscillator 2 according to the control signal provided.

On the other hand, 5 shows the main parts of the automatic tuning device of the synthesizer tuner, 6 is an up scan tuning operation button, 7 is a down scan tuning operation button, and 8 is an operation button for each of the above operation buttons 6 or 7. a synthesizer tuner control system for automatically selecting stations by controlling an up-down counter, prescaler, etc. (not shown) according to the requirements;
Reference numeral 9 indicates a music source selection switch (not shown), which is linked to a function switch and a band selection switch, and is closed only when receiving the AM band (or LW band); 10 indicates each of the above-mentioned operation buttons 6 or 7; It works by operating,
A control signal is output to the control logic system 3 and the switch circuit 4 to put them in a pause state and stop the operation of the recording bias oscillator 2. Also, when the tuner receives a station and a predetermined period of time has elapsed, a release signal is generated. A scan command hold circuit 11 is designed to release the pause state and return the bias oscillator to the operating state, and 11 is a delay circuit. If a so-called hold-scan method is adopted in which the scan tuning operation is automatically started again after stopping for 5 seconds, a control signal indicating that synchronization has been achieved from the synthesizer tuner control system within the period of stopping. is output, the scan command hold circuit 10 malfunctions, the recording bias oscillator operates, and the pause is not released.In order to prevent this control signal from being released, the control signal is delayed for a predetermined period of time before being input to the scan command hold circuit 10. This is provided because a control signal will not be input to the scan command hold circuit 10 if the station is temporarily stopped at a station other than the desired station.

The configuration of the present invention is as described above, and its operation will be explained next.

The switch 9 is linked to the music source changeover switch (commonly known as the function switch), and is in an open state when the mode is not AM (or LW). When the recording button R is operated, a control signal is sent from the control logic system 3. A motor, a tape drive mechanism, an electric circuit, etc. (not shown) are outputted, and the bias oscillator 2 is operated to supply erasing current and recording bias current to erasing head EH and recording head RH, respectively. In this state, the switch circuit 4 is in a conductive state.
In this state, in order to record AM (or LW) broadcasts, selector switch 9 is set to AM band (or LW).
When switching to band), the switch 9 is closed, and by operating the up-scanning operation button 6 or the down-scanning operation button 7, the synthesizer control system 8 is operated to control the up-down counter, prescaler, etc. (not shown). At the same time, the scan command hold circuit 10 operates to output a control signal, send a pause command to the control logic system 3 via the switch 9, and force the tape drive mechanism (not shown) to operate. The operation of the recording bias oscillator 2 is stopped by opening the switch circuit 4 at the same time as entering the pause state. In other words, even if the recording mode is selected, the bias oscillator is stopped during tuning, so the bias oscillation frequency or its harmonics is AM (or LW).
Since it does not exist within the band, the automatic channel selection device will not malfunction as described above. When the scan tuning operation is stopped after tuning to the desired incoming radio wave, the synthesizer tuner control system 8 outputs a tuning signal indicating that the tuning has been performed, and the delay circuit 11 outputs the tuning signal after a predetermined period of time to the scan command hold circuit 10. The hold circuit 10 outputs a release signal to release the pause state of the control logic system 3, release the open state of the switch circuit 4 and make it conductive, and operate the recording bias oscillator 2 to enter the recording state. It is what you do.

Furthermore, in this embodiment, automatic tuning is performed using a hold-scan method in which the scan-tuning operation is restarted after stopping for 2 to 5 seconds each time a regular incoming radio wave is received. Even if a tuning signal is output from the synthesizer control system 8 when the station is temporarily stopped at a station other than the desired station, it is delayed by the delay circuit 11,
Since scanning is started again before the tuning signal is input to the scan command hold circuit 10, the hold circuit 10 does not output a release signal and remains in the pause state and the switch circuit 4 even if it receives a station other than the desired station. The open state is never released.

As described above, the present invention is a synthesizer tuner with a tape recorder that combines a tape recorder and a synthesizer tuner. There is a possibility that the bias oscillation frequency or its harmonics exist within the receiving band, and this is particularly dangerous.
When automatically tuning to record the AM band (or LW band), operate the up scan tuning operation button or down scan tuning operation button to stop the operation of the recording bias oscillator and force it. This system is designed to put the tape recorder into a pause state, completely eliminating the possibility that the automatic tuning device will malfunction due to receiving the bias oscillation frequency or its harmonics when tuning to the AM band (or LW band). At the same time, when selecting a station, the recording bias oscillator is stopped and the tape is forced into a pause state so that it does not run, so no distorted sound is recorded, and there is no waste of tape, which has great benefits. It is what it is.

[Brief explanation of the drawing]

The figure is a block diagram of the main part of an embodiment of the present invention. Explanation of symbols: 1... Tape recorder section, 2... Recording bias oscillator, 3... Control logic system, 4... Switch circuit, 5... Synthesizer tuner section, 8... Synthesizer tuner control system, 10... Scan command hold circuit, 1
1...Delay circuit.

Claims (1)

[Scope of utility model registration request] Control signal output means for outputting a control signal in connection with the tuning operation of the tuner with automatic tuning device; and release signal output means for outputting a cancellation signal in connection with the tuning of the tuner with automatic tuning device. , switch means for inputting the control signal to stop the recording bias oscillator of the tape recorder, and inputting the release signal to activate the recording bias oscillator, the recording bias oscillator is activated. When a tuning operation is performed in a state where the tuner is tuned, the recording bias oscillator is stopped by the control signal via the switch means, and when the tuner with automatic tuning device is tuned, the release signal is used to stop the recording bias oscillator. 1. A tape recorder with a tuner and an automatic tuning device, characterized in that the recording bias oscillator is returned to an operating state via a switch means.