JPH0246135Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a stereo type tape recorder with a built-in telephone pick-up sensor, which allows normal stereo recording and playback, and at the same time allows This invention relates to a stereo tape recorder capable of recording the contents of a telephone on-board and also reproducing light music for use during waiting time while the telephone is in use.

Conventionally, the method of recording the telephone content and playing light music for use while waiting while the telephone is in use is to use a tape recorder that records the telephone content with a built-in or external telephone pick-up sensor. It has been known that a music box or other music playback device is placed near the telephone to provide light music while the telephone is in use.

However, in the conventional method, one music playback device such as a music box is required for each telephone, which increases costs for companies that use many telephones for business purposes. Furthermore, since the music playback device is relatively large in size, it has the disadvantage that it gets in the way when placed near a telephone.

The purpose of this invention is to solve the above-mentioned shortcomings, by configuring a stereo type tape recorder to be able to record the content of the telephone and also to play light music during the waiting time while the telephone is in use. So, while carrying the tape recorder,
The above operations can be performed using any telephone at any time.

Hereinafter, the configuration of the circuit according to the present invention will be explained with reference to the drawings. FIG. 1 is a diagram showing the configuration of the circuit according to the present invention, and 1 and 2 are linked by a recording switch. 1a and 2a are record/playback switches 1 and 2
The movable contacts 1b and 2b are the fixed contacts of one of the recording/reproducing switches 1 and 2, and in the illustrated state they are on the recording side. 1c and 2c are the other fixed contacts of the recording/reproducing switches 1 and 2, and 3, 12, and 13 are telephone changeover switches that are interlocked. 3a is a movable contact piece of the telephone switch 3, which is connected to the input of the microamplifier 7 of the preamplifier 5 of the left channel. Reference numeral 3b is connected to a built-in telephone pick-up sensor 4 by one fixed contact piece of a telephone changeover switch 3, and the state shown in the figure is switched to the telephone side. 3c is the other fixed contact piece of the telephone switch 3;
5 is a telephone pickup sensor, 5 is a left channel preamplifier, and 6 is a recording/playback logic switching circuit inside the left channel preamplifier 5. In the current state, the recording/playback switch 1 has a movable contact 1a and one fixed contact 1b. It is in a recording state because it is connected to earth and is grounded. 7 is a microphone amplifier for the left channel preamplifier 5, 8 is a line amplifier for driving the recording/playback head of the left channel preamplifier 5, 9 is a bias oscillation circuit for the left channel, 1
0a is the L channel of the stereo head, 10b is the right channel of the stereo head, 11 is an audio tape, 12a is a movable contact piece of the telephone switch 12, and 12b is one contact piece of the telephone switch 12. The movable contact piece 12a and one fixed contact piece are connected, and one of the right channels 10b of the stereo head is grounded. 13a is a movable contact piece of the telephone switch 13, and the recording/playback switch 2
It is connected to one fixed contact piece. Reference numeral 13b designates one fixed contact piece of the telephone switch 13, which is connected to the recording/reproducing logic switching circuit 15 inside the preamplifier 14 of the right channel. In the illustrated state, one of the fixed contact pieces 13b is the movable contact piece 1.
3a, the recording/playback switch 2 is not grounded through the fixed contact 2b and movable contact 2a, and as a result, the recording/playback logic switching circuit 15 inside the preamplifier 14 of the right channel is in the playback state. is maintained. 14 is a preamplifier for the right channel, 15 is a recording/playback logic switching circuit inside the preamplifier 14 for the right channel, 16 is a playback amplifier for the preamplifier 14 for the right channel, 17 is a volume for adjusting the playback volume for the right channel, and 18 is for the right channel. A dual power amplifier can amplify both left channels, and 19 is the right channel speaker.

Next, the operation of the stereo tape recorder configured as above will be specifically explained.

The linked telephone selector switches 3, 12, and 13 are shown tilted toward the side that records the contents of the telephone, so the telephone pick-up sensor 4, which is built into the tape recorder and attached around the telephone, is connected to the telephone. Guide and detect the content of. This detection signal is applied to the microamplifier 7 of the preamplifier 5 of the left channel from one fixed contact piece 3b of the telephone switch 3 through the movable contact piece 3a. Furthermore, this detection signal passes through the line amplifier 8, is superimposed on the bias signal of the left channel bias oscillator 9, and is recorded as a left channel signal component of the stereo head. Furthermore, since the movable contact piece 1a of the recording/playback switch 1 that is grounded is connected to one fixed contact piece 1b instead of the other fixed contact piece 1c, the recording/playback logic switching circuit of the preamplifier 5 of the left channel is Retained in recording state.

Next, on the right channel side, the movable contact piece 2a of the recording/playback switch 2 is connected to one fixed contact piece 2b and falls to the ground, but the movable contact piece 13a of the telephone switch 13 is connected to one fixed contact piece 2b. 13
Since it is not connected to b, the recording/reproducing logic switching circuit 15 of the right channel preamplifier 14 does not fall to ground. Therefore, the right channel preamplifier 14 is maintained in the reproduction state. By this,
By reproducing a tape of light music previously recorded on an audio tape 11, a reproduction signal is detected from the right channel 10b of the stereo head and applied to the input of the reproduction amplifier 16 of the preamplifier 14 of the right channel. From now on, you can change the volume of the music to the right channel's playback volume variable volume 1.
7 to adjust the dual power amplifier 1
8 and sends the signal to the right channel speaker 19 so that it can be played as a sound.

The volume of this light music can be adjusted by varying the reproduction volume variable volume 17.

Next, in order to play back the recorded contents of the telephone call, turn the linked recording/playback switches 1 and 2 to the opposite side and put both the right channel and left channel into the playback state so that the recorded contents can be played back. Can be done.

If it is desired to use the tape recorder as a normal stereo tape recorder, this can be done by switching the telephone switch-on switches 3, 12, and 13 to the opposite sides.

As mentioned above, in addition to the normal stereo recording and playback functions, this invention has a built-in telephone pick-up sensor and a linked telephone switch. It has the effect of not only being able to record the content, but also allowing light music to be played during waiting time while the telephone is on. This is especially effective for businessmen who work in companies with many telephones, as they can utilize the above two functions on any telephone by carrying one tape recorder.

[Brief explanation of the drawing]

The drawing is a circuit diagram of the present invention. 1, 2...recording/reproduction switch, 1a, 2a...movable contact piece, 1b, 2b...one fixed contact piece, 1c, 2
c...Other fixed contact piece, 3, 12, 13...Telephone on switch, 3a, 12a, 13a
...Movable contact piece, 3b, 12b, 13b...One fixed contact piece, 3c...Other fixed contact piece, 4...Telephone pick-up sensor, 5...Left channel preamplifier, 6, 15...Record Relogic switching circuit, 7...Microphone amplifier, 8...Line amplifier, 9...Bias oscillation circuit, 10a...Left channel of stereo head, 10b...Right channel of stereo head, 11...Audio tape, 14 ...Right channel preamplifier, 16...
...Playback amplifier, 17...Volume for variable playback volume, 18...Power amplifier, 19...Speaker.

Claims (1)

[Scope of utility model registration request] a dual-channel preamplifier having at least a logic switching circuit for switching between recording and playback, and a recording/playback switch for controlling the logic switching circuit;
It is equipped with a telephone pick-up sensor that detects the content of the telephone, a switch for switching between recording and playing back the telephone content and normal stereo recording and playback, and a variable playback volume polyurethane that can adjust the volume. When the switch is switched to the side where the telephone contents are recorded, the telephone pick-up sensor for one channel is connected to the preamplifier of said one channel, and the telephone contents are recorded and played back according to the position of the record/play switch. A stereo tape recorder characterized in that light music is played from one channel regardless of the position of the recording/playback switch.