Śrīmad-Bhāgavatam 11.14.34
హృద్యవిచ్ఛిన్నమోఙ్కారం ఘణ్టానాదం బిసోర్ణవత్ ।
ప్రాణేనోదీర్య తత్రాథ పున: సంవేశయేత్ స్వరమ్ ॥ ౩౪ ॥
hṛdy avicchinam oṁkāraṁ
[hridy avichchinam omkaaram]
ghaṇṭā-nādaṁ bisorṇa-vat
[ghantaa-naadam bisorna-vat]
prāṇenodīrya tatrātha
[praanenodeerya tatraatha]
punaḥ saṁveśayet svaram
[punah samveshayet svaram]
Word-for-word
hṛdi
—
in the heart
avicchinnam
—
uninterrupted, continuous
oṁkāram
—
the sacred vibration om
ghaṇṭā
—
like a bell
nādam
—
sound
bisa-ūrṇa-vat
—
like the fiber running up the lotus stalk
prāṇena
—
by the wind of prāṇa
udīrya
—
pushing upward
tatra
—
therein (at a distance of twelve thumb-breadths)
atha
—
thus
punaḥ
—
again
saṁveśayet
—
one should join together
svaram
—
the fifteen vibrations produced with anusvāra..
Blended reading (Sanskrit + English inline)
hṛdy avicchinam oṁkāraṁ
hṛdi
in the heart
avicchinnam
uninterrupted, continuous
oṁkāram
the sacred vibration om
ghaṇṭā-nādaṁ bisorṇa-vat
ghaṇṭā
like a bell
nādam
sound
bisa-ūrṇa-vat
like the fiber running up the lotus stalk
prāṇenodīrya tatrātha
prāṇena
by the wind of prāṇa
udīrya
pushing upward
tatra
therein (at a distance of twelve thumb-breadths)
atha
thus
punaḥ saṁveśayet svaram
punaḥ
again
saṁveśayet
one should join together
svaram
the fifteen vibrations produced with anusvāra..
Beginning from the mūlādhāra-cakra, one should move the life air continuously upward like the fibers in the lotus stalk until one reaches the heart, where the sacred syllable om is situated like the sound of a bell. One should thus continue raising the sacred syllable upward the distance of twelve aṅgulas, and there the oṁkāra should be joined together with the fifteen vibrations produced with anusvāra.
Purport
It appears that the yoga system is somewhat technical and difficult to perform. Anusvāra refers to a nasal vibration pronounced after the fifteen Sanskrit vowels. The complete explanation of this process is extremely complicated and obviously unsuitable for this age. From this description we can appreciate the sophisticated achievements of those who in former ages practiced mystic meditation. Despite such appreciation, however, we should stick firmly to the simple, foolproof method of meditation prescribed for the present age, the chanting of Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
Beginning from the mūlādhāra-cakra, one should move the sound oṁ, fine as the fiber in a lotus stem, which has the sound of an uninterrupted bell, upward to the heart by means of the prāṇa and make its steady there.
Starting from the mūladhāra-cakra, one should then lead the sound oṁ, having the uninterrupted sound of a bell, upwards by twelve fingers (nine inches) using the prāṇa to the heart. This sound is as fine as a fiber in the lotus stem. One should make the sound (svaram) steady there.
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Source: vedabase.io