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FIELD OF THE INVENTION The present invention relates to a tape recorder with a built-in
microphone. 2. Description of the Related Art In general, a tape recorder is provided with a builtin microphone for the purpose of easily recording external sound. FIG. 3 shows a conventional
tape recorder. As shown in FIG. 3, the sound spread by the built-in microphone 1 passes between
the a and b terminals of the recording / reswitching circuit 2 and is led to the recording amplifier
3 which is activated during recording, and amplified by the recording amplifier 3. After that, it is
recorded on the tape 5 by the recording head 4. Reference numeral 6 in FIG. 3 denotes a first
built-in microphone bias resistor. As described above, the built-in microphone 1 used for picking
up external sound at the time of recording and recording on the tape in the device as described
above has a recording / reproduction switching circuit 2 on the reproduction side (b Switching
between terminals (c)) and the signal path is cut off. That is, the built-in microphone of the device
does not perform any function at the time of reproduction of the device. Thus, the present
invention is utilized to provide a built-in microphone that does not perform any function at the
time of reproduction so as to have a function for improvement of the reproduction sound quality
emitted from the speaker of the device. problem? Means for Solving the Problem In order to
solve the above problems, the tape recorder of the present invention places the built-in
microphone near or directly above the speaker, receives the reproduced sound and the sound
emitted from the speaker, amplifies it and reproduces it. It is characterized in that negative
feedback is applied to the reproduction amplifier only at times. Operation According to the
present invention, the built-in microphone, which has conventionally had no function during
device playback, receives the sound of the playback speaker and amplifies it to apply negative
feedback to the playback amplifier. It is used as a pickup for improving the sound quality at the
time of playback, while at the time of recording it exhibits the function of capturing the
conventional external sound and recording it on a tape, and connecting circuits for recording and
playback. By switching, one microphone can be used in common. EXAMPLES Hereinafter,
examples of the present invention will be described with reference to the drawings. FIG. 1 shows
an embodiment of the present invention. In FIG. 1, when recording an apparatus, an external
signal is captured by a microphone 1 built in the apparatus, and the signal passes through the
terminal of a changeover switch 2a that moves in conjunction with a recording / reproduction
changeover switch and is amplified by a recording amplifier 3. , Added to the recording /
reproducing head 4 and recorded on the tape 5. On the other hand, at the time of reproduction of
the device, the reproduction sound from the music tape or the radio detection output is applied
to the power amplifier input terminal 10, amplified by the power amplifier 7 and then added to
the speaker 8 and reproduced as reproduction sound.
The sound reproduced by the speaker 8 is seen by the microphone 1 arranged in the vicinity of
the speaker, passes through the terminal of the changeover switch 2b which moves in
conjunction with the recording / reproduction switch, amplified by the amplifier 9, and then
power amplifier It is added to 7 in the form of negative feedback. Therefore, as shown in FIG. 2,
the microphone 1 built in the device is disposed in the immediate vicinity of the periphery of the
speaker 8 or just above the cone paper 8a of the speaker 8, and the reproduced sound of the
speaker 8 easily reaches the microphone It is desirable to be configured to be able to. By thus
picking up the reproduced sound from the speaker and applying negative feedback t, the
distortion of the sound that has conventionally occurred at the time of large amplitude of the
speaker, the reproduction band of the sound becomes remarkable by the negative feedback in
the form including the speaker. Be improved. As described above, according to the present
invention, the microphone is disposed in the vicinity of or directly above the speaker, and the
function of recording an external signal on a wide tape at the time of recording with the
microphone arranged in this manner is the same at the time of reproduction. The microphone
can be configured to have a function for improving the sound quality of the speaker by
negatively feeding back the reproduced sound of the speaker to the reproduction amplifier by
the switching circuit interlocked with the recording / reproduction switch. The built-in
microphone, which has been functioning only during conventional recording, can also be used
during playback, which is extremely useful in practice.
Brief description of the drawings
FIG. 1 is a block diagram showing an embodiment of a tape recorder according to the present
invention, FIG. 2 is a sectional view of the main part thereof, and FIG. 3 is a block diagram of a
conventional tape recorder.
1 ииииииииииииииииии Built-in microphone, 2 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и recording and
playback head, 6 и и и и и и и и и 7 иии Power amplifier, 8 и и и и и и и и и и и и и и и и и и и и и и и и и и и power amplifier
input terminal. Fig. 1 f-Mike 7 = -4 7 + 7
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