JPH02250597A - Binaural sound recording headphone microphone - Google Patents

Abstract

PURPOSE:To simplify a configuration by simultaneously obtaining an electric sound recording signal output and an acoustic monitor signal output by means of a single electroacoustic transducer. CONSTITUTION:An electroacoustic transducer 11 provided on one side of a bridge circuit 15 functions as a microphone, which transduces the acoustic sound recording signal into the electric sound recording signal, and outputs it from a sound recording signal output terminal pair 16A and 16B. Simultaneously the transducer 11 functions as a speaker, which transduces the electric monitor signal supplied to a monitor signal input terminal pair 17A and 17B into the acoustic monitor signal output. Thus the circuit configuration can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a headphone microphone for pinaural recording.

B. Summary of the Invention The present invention provides a bridge circuit that satisfies a balance condition, in which an electroacoustic transducer having a reversible electroacoustic transducer function is connected on one side, and an electrically recorded signal converted by the electroacoustic transducer. By providing a pair of recording signal output terminals for taking out the signal and a pair of monitor signal input terminals for supplying the electrical monitor signal, it is possible to output the electrical recording signal and the acoustic monitor signal using - electroacoustic transducers. This enabled us to create a headphone microphone for pinaural recording at the same time.

C. Conventional technology Conventionally, when performing binaural recording on a tape recorder or the like, in order to monitor the recording state, a binaural recording headphone microphone has been used in which a binaural recording microphone and a monitor speaker are placed close to each other. ing.

In general, in headphone microphones for binaural recording, the binaural recording microphone and the monitor speaker are placed close to each other, which tends to cause howling. Countermeasures have been taken, such as making the volume adjustable.

The present invention provides a headphone microphone for binaural recording with a novel configuration that allows signal output to be obtained simultaneously.

D Problems to be Solved by the Invention As mentioned above, in the conventional headphone microphone for binaural recording, howling occurs because the microphone for binaural recording and the monitor speaker are placed close to each other. Moreover, since the binaural recording microphone and the monitor speaker are installed separately, it is not possible to install the binaural recording microphone and the 72-channel speaker at the same location, and the monitor speaker There is a problem in that a pinaural effect state that is different from the one that is confirmed is recorded.

Therefore, the present invention aims to solve the above-mentioned conventional problems with headphone microphones for binaural recording. Means for Solving the Problem In order to achieve the above-mentioned object, the binaural recording headphone microphone according to the present invention uses a bridge circuit that satisfies a balance condition in which an electroacoustic transducer having a reversible electroacoustic conversion function is connected on one side. , a pair of signal output terminals for taking out an electrical recording signal converted by the electroacoustic transducer and a pair of signal input terminals for supplying an electrical monitor signal.

F action In the headphone microphone for binaural recording according to the present invention, the electroacoustic transducer described above generates sound at the recording signal output terminal provided in the bridge circuit which is connected to one side of the electroacoustic transducer having a reversible electroacoustic transducer function. An electrical recording signal is obtained by converting the signal, and a monitor signal applied to a monitor signal input terminal provided in the bridge circuit is converted into an acoustic signal by the electroacoustic transducer and output.

G. Example Hereinafter, an example of the headphone microphone for binaural recording according to the present invention will be described in detail with reference to the drawings.

The circuit configuration diagram in FIG. 1 shows the main part configuration of one channel of the recording system of a tape recorder for pinaural recording to which the present invention is applied. )teeth,
Recording signal output terminals (16A) and (16B) are connected to the bridge circuit (15) to which the electroacoustic transducer (11) is connected to the - side.
) pair and mono signal input terminals (17A), (17B)
A pair of recording signal output terminals (16A) and (16B) are provided at the input end of the input amplifier (21) of the recording system.
) is connected, and the monitor output amplifier (
21) at the output end thereof is the monitor signal input terminal (17A).

(17B) is connected.

The prefuji circuit (15) includes the electroacoustic transducer (1
1) G, impedance Z of the electroacoustic transducer (11)
Impedance Z + z (Z + z - Z +
+) characteristic, and two resistors (13) and (14) having mutually equal resistance values Rz+R+*(R+t-R+□), Zz ・R+i −Zl!・R+z The equilibrium condition is satisfied.

This bridge circuit (15) includes the circuit element (12) and each resistor (13), (14) connected to the tape recorder main body (
The electro-acoustic transducer (11), which is built in on the 2o) side and provided at the tip of the external cord (18), connects the plug (19) to the jack (23) provided on the tape recorder main body (20). By inserting it, it is connected to the - side.

As the electroacoustic transducer (11), one having a reversible electroacoustic conversion function, such as a dynamic speaker or a condenser microphone, is used.

Further, as the circuit element (12), the same electroacoustic transducer as the electroacoustic transducer (11) is housed and sealed in a small container.
FDRN (Frequency Dependency
dent negative resistance)
Circuit elements can be used.

In the headphone microphone (10) for binaural recording having such a configuration, acoustic recording is performed by the electroacoustic transducer (11) provided on the negative side of the bridge circuit (15) configured to satisfy the equilibrium condition as described above. When a signal is applied, the balance of the bridge circuit (15) is disrupted by the amount of the acoustic recording signal that is converted into an electrical recording signal by the electroacoustic transducer (11), and the electroacoustic transducer (11) (1
The electrical recording signal voltage converted in step 1) is obtained between the pair of recording signal output terminals (16A)' and (16B).

And the above recording signal output terminal (16^), (16
B) The electrical recording signal obtained between the pairs is amplified by the input amplifier (21) of the recording system and supplied to a recording circuit (not shown).

Further, the monitor signal voltage from the monitor output amplifier (21) of the recording system is input to the monitor signal input terminal (17A).
, (17B), a signal current corresponding to the monitor signal voltage flows through the electroacoustic transducer (11) provided on the - side of the bridge circuit (15), and an electrical monitor signal is generated. is converted into an acoustic monitor signal by the electroacoustic transducer (11) and output.

Since the bridge circuit (15) has a configuration that satisfies the equilibrium condition as described above, the recording signal output is controlled by the receive signal voltage applied between the pair of monitor signal input terminals (17^) and (17B). Terminal (16A), (
16B) No potential difference is created between the pair.

That is, the electroacoustic transducer (11) provided on the negative side of the bridge circuit (15) converts an acoustic recording signal into an electrical recording signal and outputs the recording signal output terminal (16A) to the recording signal output terminal (16A).
), (16B) functions as a microphone outputting from the pair, and at the same time serves as the monitor signal input terminal (17^)
, (17B) functions as a speaker that converts the electrical monitor signal applied to the pair into an acoustic monitor signal output.

Note that although the binaural recording headphone microphone (10) of this embodiment shows only the essential configuration of one channel in FIG. 1, the other channels have a similar configuration.

In the headphone microphone (10) for binaural recording having such a configuration, each channel has an electroacoustic transducer (
11) function as a speaker and a microphone at the same time, it is possible to obtain an optimal pinaural effect, and moreover, it does not cause howling. In addition, as in this embodiment, the bridge circuit (15) is configured as shown in FIG. the circuit element (12) and each resistor (13),
By incorporating (14) into the tape recorder main body (20) side, the external connection cord (19) for the tape recorder main body (20) can also be used as a signal line for monitoring and a signal line for recording. .

Effects of the Invention In the headphone microphone for binaural recording according to the present invention, the electroacoustic transducer described above is connected to a recording signal input terminal provided in a bridge circuit in which an electroacoustic transducer having a reversible electric sound conversion function is connected to one side. An electrical recording signal obtained by converting the acoustic signal is obtained, and a monitor signal applied to the monitor signal input terminal provided in the Brifuji circuit is converted into an acoustic signal by the electroacoustic converter and output. , it is not necessary to have separate microphones for pinaural recording and speakers for monitoring, and the optimal pinaural effect can be obtained with a single electroacoustic transducer.
Moreover, it is possible to obtain a noodle-like output without causing howling (recording signal voltage 9).

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing a main part configuration for one channel of a headphone microphone for binaural recording according to the present invention. (10)・・・・・・・・・ Headphones for pinaural recording (11)・・・・・・・・・・ (15)・・・・・・・・・・ (16＾) , (16B )...(17A) ,
(17B) ...Microphone electroacoustic transducer bridge circuit Recording signal output terminal Monitor signal input terminal Patent granted by 1 person Sony Corporation

Claims (1)

[Claims] A pair of recording signal output terminals for taking out the electrical recording signal converted by the electroacoustic transducer are connected to a bridge circuit that satisfies the equilibrium condition, in which an electroacoustic transducer having a reversible electroacoustic conversion function is connected on one side, and an electrical 1. A headphone microphone for binaural recording, comprising a pair of monitor signal input terminals to which a monitor signal is supplied.