JPS6036913Y2 - Wireless microphone with tape playback mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wireless microphone equipped with a tape playback mechanism that can be used when broadcasting inside a moving body such as a train.

Recently, in-car broadcasting using wireless microphones has been put into practical use, and this has the advantage that the conductor can broadcast freely from any car while patrolling the inside of the car.

In-vehicle broadcasting using such wireless microphones generally requires a volume of voice that can withstand noise and clear sound quality, and also requires easy operation.

However, in-vehicle broadcasting using conventional wireless microphones has the problem of howling caused by the positional relationship between the broadcasting location and the in-vehicle speakers.

For example, to avoid problems with wireless microphones (
One possible method is to lower the sensitivity of the train's speakers (amplifier), but this method would lower the volume of the speakers in the train, making it difficult to hear the broadcast content due to the noise of the train running or the conversations of passengers, so the conductor would have to use the microphone instead. They are forced to bring their mouths close together and broadcast loudly.

It is clear that the sound quality of broadcasting in such a close-talk situation is extremely poor, and that the in-car speaker sound lacks clarity, and that the conductor's personal broadcasting technology is required to accurately convey the broadcast content to passengers. It has the disadvantage of being dependent on it.

The object of the present invention is to provide a device that can overcome the above-mentioned drawbacks by preparing a tape on which clear broadcast content is recorded in advance and incorporating a mechanism for playing this tape into a wireless microphone.

The invention will be described below with reference to illustrated embodiments.

The figure is a block circuit diagram showing an embodiment of the present invention, and the illustrated apparatus is preferably housed in a relatively small case so as to be portable and configured so that all operations can be performed with one hand.

When performing normal tape broadcasting, first press the start switch S.
Press down W1.

As a result, the voltage of the power supply B is supplied to the relay amplifier AMP, the tape drive mechanism section DK, and the tape playback amplifier section AMP2, and is also supplied to the wireless transmitter section TX via the diode D□, so that these devices operate. state.

Therefore, clear broadcast contents pre-recorded on a microcassette tape or the like are sequentially transmitted to the playback head HD and the tape playback amplifier AM by the operation of the tape drive mechanism DK.
It is output as an audio signal via P2, and this audio signal is further transmitted from the antenna ANT via the wireless transmitter TX.

Needless to describe in detail, the transmitted signal is detected and amplified by a suitable receiving device (not shown) and then provided to the in-vehicle speaker.

On the other hand, the contact point of relay RL is arranged in parallel with the start switch SW1, so there is no need to keep pressing the start switch SW1 until the broadcast is completed, and the tape continues to play even if it is turned off at the same time as the broadcast starts. being intimidated.

That is, the playback output of the tape playback amplifier section AMP2 is amplified by the relay amplifier AMP1, and then transferred to the transformer T.
1 is applied to the relay actuating coil L1 via the rectifying diode D2, and closes the contact CT of the relay RL.

By connecting a capacitor C in parallel with the relay operating coil L, the relay RL is configured to have a predetermined time element and repeats a number of times, thereby preventing malfunctions caused by the strength of the tape playback output. are doing.

Therefore, with such a configuration, when broadcast audio ceases to exist, in other words, when tape playback output ceases to exist,
When the discharge of the capacitor C is completed, the relay contact CT is opened, the power is turned off, and the tape broadcasting operation is automatically stopped.

Next, when broadcasting using the microphone MIC, the push button switch SW2 is pressed.

This causes the voltage of power supply B to change to microphone amplifier AM
At the same time as it is supplied to P3, it is supplied to the wireless transmitter TX via diode D3, and these devices are put into operation.

Therefore, the audio signal output from the microphone amplifier AMP3 is transmitted from the antenna ANT via the wireless transmitter TX, as in the case of tape broadcasting described above.

Note that the diode D□ is a diode for isolating the tape broadcasting circuit from the power source B during microphone broadcasting, and the diode D3 is a diode for isolating the microphone broadcasting circuit from the power source B during tape broadcasting.

As described in detail above, according to the present invention, tape broadcasting for transmitting general information and microphone broadcasting for transmitting special information can be appropriately selected and carried out. You can raise the volume inside the car sufficiently without worrying about the sound quality being disturbed.

Further, according to the present invention, the operation is simple, and in the case of tape broadcasting, the tape can be stopped automatically, so that the broadcasting duties of the conductor can be reduced.

It goes without saying that the present invention can be used not only for in-train announcements, but also on station platforms and the like.

[Brief explanation of the drawing]

The figure is a block circuit diagram of an embodiment of the present invention. Code explanation, SW□, SW2...Switch, HD
...Playback head, AMP□ ...Relay amplifier, AMP2 ...Tape playback amplification section, DK
...Tape drive mechanism section, TX ... Wireless transmission section, ANT ... Antenna, RL ...
...Relay L...Relay operating coil, C
T...Contact, C...Capacitor, B...
...Power supply, T...Transformer, MIC...
...Microphone, AMP3...Microphone amplifier, D1-D3...Diode.

Claims (1)

[Scope of utility model registration request] a first switch for selecting a tape broadcast mode; a tape reproduction amplification section for reproducing broadcast contents prerecorded on a tape; a second switch for selecting a microphone and a microphone broadcast mode; and a second switch for selecting a microphone and a microphone broadcast mode; Inputting the audio signal reproduced and output by the tape reproduction amplification section, inputting the audio signal of the broadcast content inputted to the microphone in the microphone broadcasting mode, and transmitting a transmission signal corresponding to each of the audio signals. A wireless microphone characterized by comprising: a wireless transmitter that selectively outputs;